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|[pic] Question 1 |4 points |Save |
| |Is the statement H0: = 11 a valid null hypothesis? | | | | |
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| |Yes, this is a statement that compares a parameter to a value | | | | |
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| |Yes, this is a statement that compares two parameters | | | | |
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| |No, equalities are not permitted in a null hypothesis | | | | |
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| |No, there is no parameter contained in this statement | | | | |
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|[pic] Question 2 |4 points |Save |
| |For the conjecture "The average age of students in this class is 19", the null hypothesis is: | | | | |
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| |We accept the hypothesis that the average age of students in this class is 19 | | | | |
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| |The average age of students in this class is 19 | | | | |
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| |The average age of students in this class is not 19 | | | | |
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| |We reject the hypothesis that he average age of students in this class is 19 | | | | |
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|[pic] Question 3 |4 points |Save |
| |For the conjecture "The average weight of a cuckoo bird is less than or equal to $2.2 pounds", the null and| | | | |
| |alternative hypotheses are: | | | | |
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| |H0 The average weight of a cuckoo bird is less than or equal to $2.2 pounds, HA The average weight of a | | | | |
| |cuckoo bird is less than $2.2 pounds | | | | |
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| |[pic] | | | | |
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| |H0 The average weight of a cuckoo bird is equal to $2.2 pounds,HA The average weight of a cuckoo bird is | | | | |
| |less than or equal to $2.2 pounds | | | | |
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| |[pic] | | | | |
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| |H0 The average weight of a cuckoo bird is more than or equal to $2.2 pounds, HA The average weight of a | | | | |
| |cuckoo bird is less than $2.2 pounds | | | | |
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| |[pic] | | | | |
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| |H0 The average weight of a cuckoo bird is less than or equal to $2.2 pounds, HA The average weight of a | | | | |
| |cuckoo bird is more than $2.2 pounds | | | | |
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|[pic] Question 4 |4 points |Save |
| |Using the z table in Table E of Appendix C, determine the critical value for the left-tailed test with | | | | |
| |x=0.02 | | | | |
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| |2.33 | | | | |
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| |2.05 | | | | |
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| |-2.33 | | | | |
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| |-2.05 | | | | |
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|[pic] Question 5 |4 points |Save |
| |Using the z table in Table E of Appendix C, determine the critical value for the right-tailed test with x | | | | |
| |=0.035 . | | | | |
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| |0.39 | | | | |
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| |2.05 | | | | |
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| |1.81 | | | | |
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| |2.11 | | | | |
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|[pic] Question 6 |4 points |Save |
| |A recent gasoline survey said that the national average price of gasoline was $1.498 a gallon. It was felt | | | | |
| |that gasoline in Texas was significantly lower than the national average. A survey of 10 different suburbs | | | | |
| |in Dallas, Texas found the average price of gasoline to be $1.294 a gallon with a standard deviation of | | | | |
| |$0.0526. What is the critical value using x =0.01 ? | | | | |
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| |1.26 | | | | |
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| |2.33 | | | | |
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| |-1.26 | | | | |
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| |-2.33 | | | | |
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|[pic] Question 7 |4 points |Save |
| |If the observed value is 10, the expected value is 8, and the standard error is 2, then the test value used| | | | |
| |for the z test is equal to | | | | |
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| |1.00 | | | | |
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| |2.00 | | | | |
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| |-2.00 | | | | |
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| |-1.00 | | | | |
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|[pic] Question 8 |4 points |Save |
| |If the observed value is 8, the expected value is 9, and the standard error is 2, then the test value used | | | | |
| |for the z test is equal to | | | | |
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| |0.50 | | | | |
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| |1.00 | | | | |
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| |-1.00 | | | | |
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| |-0.50 | | | | |
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|[pic] Question 9 |4 points |Save |
| |The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims | | | | |
| |that her dogs are faster than the average greyhound. In a sample of 30 of her dogs, they ran, on the | | | | |
| |average, 19.5 meters per second with a standard deviation of $1.2. Is her claim correct? | | | | |
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| |Yes, because 0.11 falls in the critical region | | | | |
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| |No, because 0.11 falls in the critical region | | | | |
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| |Yes, because 3.20 falls in the critical region | | | | |
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| |No, because 0.7 falls in the critical region | | | | |
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|[pic] Question 10 |4 points |Save |
| |A recent report from the American Medical Association claims that for the first time in 10 years, the | | | | |
| |average salary of psychiatrists was $189,121 with a standard deviation of $26,975. A random sample of 64 | | | | |
| |psychiatrists this year yielded an average salary of $198,630. Is there evidence that the average salary | | | | |
| |is actually higher than what the American Medical Association reported? At x=0.05 , what is the p-value | | | | |
| |for a one-sided test? | | | | |
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| |0.0024 | | | | |
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| |0.0035 | | | | |
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| |0.1328 | | | | |
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| |0.0237 | | | | |
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|[pic] Question 11 |4 points |Save |
| |An average computer mouse inspector can inspect 50 mice per hour. The 42 computer mice inspectors at a | | | | |
| |particular factory can only inspect 46 mice per hour with a standard deviation of 14. Does the company | | | | |
| |have reason to believe that these inspectors are slower than average? | | | | |
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| |No, because -1.85 falls in the noncritical region | | | | |
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| |Yes, because -1.07 falls in the noncritical region | | | | |
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| |No, because -1.85 falls in the noncritical region | | | | |
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| |Yes, because -1.07 falls in the noncritical region | | | | |
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|[pic] Question 12 |4 points |Save |
| |Nationwide, the average waiting time until a electric utility customer service representative answers a | | | | |
| |call is 350 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and found | | | | |
| |that, on the average, they answered in 290 seconds per call with a standard deviation of $55. Can the | | | | |
| |company claim that they are faster than the average utility? | | | | |
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| |Yes, because -6.45 falls in the critical region | | | | |
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| |No, because -1.09 falls in the critical region | | | | |
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| |Yes, because -0.18 falls in the critical region | | | | |
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| |No, because -0.18 falls in the critical region | | | | |
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|[pic] Question 13 |4 points |Save |
| |What is the critical t-value for a two-tailed test when x=0.02 and d.f. = 18? | | | | |
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| |2.567 | | | | |
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| |2.101 | | | | |
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| |2.552 | | | | |
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| |1.740 | | | | |
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|[pic] Question 14 |4 points |Save |
| |What is the critical t-value for a right-tailed test when x =0.025 and d.f. = 12? | | | | |
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| |2.179 | | | | |
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| |2.831 | | | | |
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| |2.228 | | | | |
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| |1.869 | | | | |
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|[pic] Question 15 |4 points |Save |
| |At a certain university, the average attendance at basketball games has been 2900 spectators per game. | | | | |
| |Due to the dismal showing of the team this year, the attendance for the first 9 games has been only 2650 | | | | |
| |spectators per game with a standard deviation of 450. The athletic director claims that the attendance is| | | | |
| |the same as last year. If x =0.05, what is the test value? | | | | |
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| |-1.67 | | | | |
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| |-3.33 | | | | |
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| |-3.89 | | | | |
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| |-5.00 | | | | |
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|[pic] Question 16 |4 points |Save |
| |A recent gasoline survey said that the national average price of gasoline was $1.498 a gallon. It was | | | | |
| |felt that gasoline in Texas was significantly lower than the national average. A survey of 10 different | | | | |
| |suburbs in Dallas, Texas found the average price of gasoline to be $1.294 a gallon with a standard | | | | |
| |deviation of $0.0526. What is the critical value using ? | | | | |
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| |1.26 | | | | |
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| |2.33 | | | | |
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| |-1.26 | | | | |
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| |-2.33 | | | | |
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|[pic] Question 17 |4 points |Save |
| |Doctors nationally believe that 60% of a certain type of operation are successful. In a certain hospital,| | | | |
| |51 of these operations were observed and 62% of them were successful. If x = .05, is this hospital's | | | | |
| |success rate different from the national average? | | | | |
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| |No, because the test value 0.17 is in the noncritical region. | | | | |
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| |Yes, because the test value 0.17 is in the critical region. | | | | |
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| |No, because the test value 0.29 is in the noncritical region. | | | | |
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| |Yes, because the test value 0.29 is in the noncritical region. | | | | |
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|[pic] Question 18 |4 points |Save |
| |A political strategist believes that 56% of voters in a certain state support his candidate. He then | | | | |
| |commissions a poll of 600 voters and 52% of them support his candidate. If x = .05, is the political | | | | |
| |strategist's belief warranted? | | | | |
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| |No, because the test value -1.16 is in the critical region. | | | | |
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| |No, because the test value -2.17 is in the noncritical region. | | | | |
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| |Yes, because the test value -2.17 is in the critical region. | | | | |
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| |Yes, because the test value -1.97 is in the critical region. | | | | |
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|[pic] Question 19 |4 points |Save |
| |A scientist has a theory that 35% of geese in his area do not fly south for the winter. He tags 55 random| | | | |
| |geese in the summer and finds that 41% of them do fly south. If x = .05, is the scientist's belief | | | | |
| |warranted? | | | | |
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| |Yes, because the test value -3.73 is in the critical region. | | | | |
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| |No, because the test value -4.10 is in the noncritical region. | | | | |
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| |Yes, because the test value 4.10 is in the critical region. | | | | |
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| |No, because the test value 3.73 is in the critical region. | | | | |
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|[pic] Question 20 |4 points |Save |
| |A statistician believes that the standard deviation of the weights of firemen is less than 25 pounds. A | | | | |
| |sample of 20 firemen had a standard deviation of 23.2 pounds. Assume that the variable is normally | | | | |
| |distributed with x =0.05 . What is the critical value? | | | | |
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| |31.410 | | | | |
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| |30.144 | | | | |
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| |10.851 | | | | |
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| |10.117 | | | | |
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|[pic] Question 21 |4 points |Save |
| |A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 | | | | |
| |patients found a standard deviation of 520. Assume the variable is normally distributed and x =0.01 . | | | | |
| |What are the critical values? | | | | |
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| |9.262 and 44.181 | | | | |
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| |13.091 and 35.172 | | | | |
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| |13.848 and 36.415 | | | | |
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| |11.524 and 44.314 | | | | |
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|[pic] Question 22 |4 points |Save |
| |A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from| | | | |
| |the same blood sample. The target accuracy a standard deviation of 1.2 or less. If 18 measurements are | | | | |
| |taken and their standard deviation is 2.1, is there enough evidence to reject the claim that her standard| | | | |
| |deviation is within the limit at x = .01? | | | | |
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| |Yes, comparing the test value 7.22 and the critical value 5.90. | | | | |
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| |No, comparing the test value 29.75 and the critical value 5.78. | | | | |
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| |Yes, comparing the test value 7.22 and the critical value 5.78. | | | | |
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| |No, comparing the test value 29.75 and the critical value 5.90. | | | | |
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|[pic] Question 23 |4 points |Save |
| |A lumber mill is tested for consistency by measuring the variance of board thicknesses. The target | | | | |
| |accuracy a variance of 0.0035 or less. If 30 measurements are taken and their variance is 0.006, is there| | | | |
| |enough evidence to reject the claim that her standard deviation is within the limit at x = .01? | | | | |
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| |Yes, comparing the test value 49.71 and the critical value 49.59. | | | | |
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| |No, comparing the test value 9.23 and the critical value 49.59. | | | | |
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| |Yes, comparing the test value 49.71 and the critical value 50.89. | | | | |
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| |No, comparing the test value 9.23 and the critical value 50.89. | | | | |
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|[pic] Question 24 |4 points |Save |
| |Assume that in a hypothesis test with null hypothesis H0:µ = 13.0 at x=0.10, that a value of 15.0 for the| | | | |
| |sample mean results in the null hypothesis being rejected. That corresponds to a confidence interval | | | | |
| |result of | | | | |
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| |The 0.10% confidence interval for the mean contains the value 15.0 | | | | |
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| |The 90% confidence interval for the mean contains the value 15.0 | | | | |
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| |The 90% confidence interval for the mean does not contain the value 13.0 | | | | |
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| |There is insufficient information as to if the 90% confidence interval for the mean does or does not | | | | |
| |contain the value 15.0 | | | | |
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|[pic] Question 25 |4 points |Save |
| |If the type II error in a hypothesis test with x= 0.07 is 0.20, then the power of this test is | | | | |
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| |0.07 | | | | |
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| |0.20 | | | | |
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| |0.80 | | | | |
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| |0.93 | | | | |
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