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2. Identify the data set's level of measurement. hair color of women on a high school tennis team (Points: 4) ordinal ratio nominal interval

3. A single six-sided die is rolled. Find the probability of rolling a number less than 3. (Points: 4) 0.1 0.5 0.333 0.25

4. A group of students were asked if they carry a credit card. The responses are listed in the table. find the probability that he or she owns a credit card given that the student is a freshman. Round your answer to three decimal places. (Points: 4) 0.600 0.393 0.400 0.240

5. A test consists of 90 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean and the standard deviation of the number of correct answers. (Points: 4) mean: 45; standard deviation: 3.79 mean: 18; standard deviation: 4.24 mean: 18; standard deviation: 3.79 mean: 45; standard deviation: 6.71

6. Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Find the probability of exactly eight boys in ten births. (Points: 4) 0.8 0.176 0.044 0.08

7. The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. Find the probability of a pregnancy lasting more than 300 days. (Points: 4) 0.0166 0.3189 0.2375 0.9834

8. IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the x-score that corresponds to a z-score of 2.33. (Points: 4) 139.55 142.35 125.95 134.95

9. Assume that the salaries of elementary school teachers in the United States are normally distributed with a mean of $34,000 and a standard deviation of $2000. What is the cutoff salary for teachers in the bottom 10%? (Points: 4) $37,290 $31,440 $30,710 $36,560

10. A random sample of 40 students has a mean annual earnings of $3120 and a standard deviation of $677. Construct the confidence interval for the population mean, mu if c = 0.95. (Points: 4) ($210, $110) ($1987, $2346) ($4812, $5342) ($2910, $3330)

11. In a sample of 10 randomly selected women, it was found that their mean height was 63.4 inches. From previous studies, it is assumed that the population standard deviation is 2.4 and that the population of height measurements is normally distributed. Construct the 95% confidence interval for the population mean. (Points: 4) (59.7, 66.5) (61.9, 64.9) (58.1, 67.3) (60.8, 65.4)

12. In order to fairly set flat rates for auto mechanics, a shop foreman needs to estimate the average time it takes to replace a fuel pump in a car. How large a sample must he select if he wants to be 99% confident that the true average time is within 15 minutes of the sample average? Assume the standard deviation of all times is 30 minutes. (Points: 4) 6 26 27 5

13. In a survey of 2480 golfers, 15% said they were left-handed. The survey's margin of error was 3%. Construct a confidence interval for the proportion of left-handed golfers. (Points: 4) (0.12, 0.18) (0.11, 0.19) (0.12, 0.15) (0.18, 0.21)

14. A researcher at a major hospital wishes to estimate the proportion of the adult population of the United States that has high blood pressure. How large a sample is needed in order to be 99% confident that the sample proportion will not differ from the true proportion by more than 4%? (Points: 4) 849 1037 2073 17

15. You wish to test the claim that mu = 1200 at a level of significance of alpha = 0.01 and are given sample statistics n = 35, sample mean = 1170 and s = 82. Compute the value of the standardized test statistic. Round your answer to two decimal places. (Points: 4) -2.16 -4.67 -5.18 -3.82

16. Suppose you want to test the claim that mu is not equal to 3.5. Given a sample size of n = 31 and a level of significance of alpha = 0.10 when should you reject Ho? (Points: 4) Reject Ho if the standardized test statistic is greater than 2.575 or less than -2.575. Reject Ho if the standardized test statistic is greater than 1.96 or less than -1.96 Reject Ho if the standardized test statistic is greater than 2.33 or less than -2.33 Reject Ho if the standardized test statistic is greater than 1.645 or less than -1.645.

17. Suppose you want to test the claim that mu is greater than 25.6. Given a sample size of n = 42 and a level of significance of alpha = 0.1, when should you reject Ho? (Points: 4) Reject Ho if the standardized test statistic is greater than 1.96. Reject Ho if the standardized test statistic is greater than 1.28. Reject Ho if the standardized test statistic is greater than 1.645. Reject Ho if the standardized test statistic is greater than 2.575.

18. A manager wishes to determine the relationship between the number of miles (in hundreds of miles) the manager's sales representatives travel per month and the amount of sales (in thousands of dollars) per month. Calculate the correlation coefficient, r. (Points: 4) 0.717 0.561 0.791 0.632

19. Find the equation of the regression line for the given data. (Points: 4)

20. The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Find the equation of the regression line for the given data. (Points: 4)

21. A survey of 280 homeless persons showed that 63 were veterans. Construct a 90% confidence interval for the proportion of homeless persons who are veterans. (Points: 4) (0.184, 0.266) (0.176, 0.274) (0.167, 0.283) (0.161, 0.289)

22. A group of students were asked if they carry a credit card. The responses are listed in the table. If a student is selected at random, find the probability that he or she is a freshman given that the student owns a credit card. Round your answer to three decimal points. (Points: 4) 0.590 0.767 0.410 0.460

23. A manager gathered data to determine the relationship between the number of miles (in hundreds of miles) the manager's sales representatives travel per month and the amount of sales (in thousands of dollars). The data is shown in the table. He used statistical regression to find the line of best fit. The line equation was found to be y = 3.529x + 37.916. Predict the sales for travel of 800 miles. (Points: 4) $65 $65,000 $30686 $162.04

24. Use the given frequency distribution to find the (a) class width (b) class midpoints of the first class (c) class boundaries of the first class (Points: 4) (a) 5 (b) 137 (c) 134.5-139.5 (a) 4 (b) 137.5 (c) 134.5-139.5 (a) 4 (b) 137.5 (c) 135-139 (a) 5 (b) 137 (c) 135-139

25. The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for the exam. Calculate the correlation coefficient r. (Points: 4) 0.847 0.991 0.761 0.654

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