Oneonta



STAT 101Which of the following statements is true? I) The median is more affected by extreme values than the mean.II) A standard deviation can be negative.III) If the distribution is right skewed, then the median is less than the mean. A) I only B) II only C) III only D) I and III E) II and III A sample of AAA batteries has a mean life of 8.1 months with a standard deviation of 0.2 months. What symbols should the mean and the standard deviation, respectively, be expressed as? ? = 8.1, σ = 0.2 x=8.1, s=0.2 x=8.1,n=0.2 s = 8.1, x = 0.2 x=8.1, σ=0.2In a Gallup poll of 976 adults it was found that: 1) 68 respondents indicated that they have a drink daily; 2) 70% of those having a drink daily would select a beer; and 3) 32% never drink. Given the information provided, which of the following are correct? I) Approximately 7% represents the percent of all respondents who have a drink daily.II) 70% represents the percent of all respondents who have a drink daily that would select a beer.III) 312 respondents do not drink (round to nearest whole number).A) I only B) I and II C) I and III D) I, II, and III E) None are true.The boxplots below summarize the distribution of SAT verbal and math scores among students at an upstate New York high school. Which of the following statements are true? The range of the math scores equals the range of the verbal scores. The highest math score equals the median verbal score. The verbal scores appear to be roughly symmetric, while the math scores appear to be skewed to the right. A) I only B) III only C) I and II D) II and III E) I, II, and III273685038417500In an introductory statistics class, Doc J. gave three exams. Shown below is the distribution for Exam #1. Identify the type of distribution AND its level of difficulty for Exam #1. [NOTE: The letter below the curve, C1, represents the mean of the distribution.] Skewed Left, EasyBell, HardSkewed Right, EasySkewed Left, HardSkewed Right, HardFor a sample of size 10, the sampling distribution of the sample mean will be normally distributed if the population distribution has a known variance.any shape.a Normal distribution.any symmetrical shape.no outliers.The weights (in pounds) of 9 preschool children are listed below. Which of the following statements are true?25 25 26 31 27 28 24 35 37I. The median is 27.II. The mode is 25.III. The mean is 28.IV. The range is 12.A) I and II B) II and IV C) II and III D) All of them E) None of the above.In the table below are the record low temperatures for Oneonta, NY. What is the median temperature for these record low temperatures? 495300254000A) 26oF B) 7.5oF C) 29.5oF D) 7oF E) 33oFIf a data value has a z-score of 1.5, thenit's above the mean.it’s not unusual.it’s an outlier.Both A and B are correct.A, B, and C are all correct.USE THE FOLLOWING INFORMATION TO ANSWER QUESTIONS 10) and 11). A model of dishwasher has a mean life of 12 years with a standard deviation of 1.25 years. Use the Empirical Rule to estimate the percentage of dishwashers that will last between 9.5 years and 14.5 years. A) 95% B) 68% C) 99.7% D) 66% E) 90%What is the required condition for obtaining your above estimate? The data have an approximately bell-shaped distribution.The sample size is large.The data are up to date.The data are randomly selected.No conditions are required.434975015875004337050317500A buyer for the Its-So-Fresh Produce Company must decide whether or not to buy several truckloads of watermelons. The wholesale distributor indicates that the weights of the watermelons are normally distributed with a mean of 8.2 pounds and a standard deviation of 0.4 pounds. Its-So-Fresh’s buyer will purchase the watermelons if 20% of the watermelons exceed 8.5 pounds. Find the approximate proportion of watermelons weighing more than 8.5 pounds. Show work in the space provided.A) 0.227 B) 0.250 C) 0.599 D) 0.750 E) 0.773When a sample of 400 college students were surveyed, 140 said they own their car. Find the estimate of the population proportion, p,?of the college students who own their car.? 0.65 B) 0.35 C) 0.14 D) 140 E) None of the above.?Match the correlation coefficient (r) below to their corresponding scatterplot. 100965017081500r = - 0.45r = 0.89r = 0.67r = - 0.91Which of the following values are the most reasonable r values for Plot B and Plot D, respectively?-0.91, 0.67 B) -0.45, 0.89 C) -0.91, 0.89 D) 0.89, -0.91 E) -0.45, 0.67USE THE FOLLOWING INFORMATION TO ANSWER QUESTIONS 15) and 16). Based on the data from six students, the regression equation relating number of hours of preparation (x, data range from 0 to 20) and test score (y) is y=77.3+1.2x. The same data yield strong linear correlation of r = 0.95 and y = 75.2.What is the best predicted test score for a student who spent 23 hours preparing for the test? 110.3 B) 104.9 C) 87.3 D) 75.2 E) 67.3Is the above predicted test score reasonable? Why? Yes, the regression equation is used to find it.Yes, the mean test score is used.No, the score is over 100.No, 23 hours is beyond the data range of x.No, no one would spend 23 hours to prepare for a test.To test a claim written as the alternative hypothesis, the p-value is calculated as 0.12. At α = 0.05, what is your decision and conclusion about the claim? Accept Ho, therefore there is not enough evidence to support the claim.Fail to reject Ho, therefore there is enough evidence to reject the claim.Fail to reject Ho, therefore there is not enough evidence to support the claim.Reject Ha, therefore there is enough evidence to reject the claim. Reject Ho, therefore there is enough evidence to support the claim.USE THE FOLLOWING INFORMATION TO ANSWER QUESTIONS 18) THROUGH 21). A large software company gives job applicants a test of programming ability and the mean for that test has been 160 in the past. Twenty-five job applicants were randomly selected from one large university and their mean score was 168 with a standard deviation 32. Test the claim that this sample comes from a population with a mean score greater than 160.What are the null and alternative hypotheses? Ho: x < 160 v.s. Ha: x ≥ 160Ho: x ≤ 160 v.s. Ha: x > 160Ho: p > 160 v.s. Ha: p ≤ 160Ho: ? ≤ 160 v.s. Ha: ? >160Ho: ? = 160 v.s. Ha: ? ≠ 160Which statistical test should be used to test the claim? One- proportion Z-test, left-tailedOne- proportion Z-test, right-tailedOne-sample T-test, left-tailedOne-sample T-test, right-tailedOne-sample Z-test, two-tailedObtain the test statistic. A) 0.25 B) -0.25 (C) -1.25 D) 1.25 E) None of the above are correct.In order to conduct the above test, what are the required conditions for the data? I. The data have an approximately a bell-shaped distribution.II. The data are randomly selected.III. The sample size is at least 30.IV. The numbers of successes and failures are at least 5.I, II, III, and IV B) I, II, and III C) I and II D) III and IV E) II, III, and IV ................
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