STA 2023 Extra Credit 2 Quiz Answers - ECquiz2 ECquiz2 Part1of6 1.0\/1.0Points 1.0\/1.0Points Question1of6 (inmiles.

STA 2023 Extra Credit 2 Quiz Answers - ECquiz2 ECquiz2...

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Unformatted text preview: 5/4/2015 EC quiz 2 EC quiz 2 Part 1 of 6 ­ 1.0/ 1.0 Points 1.0/ 1.0 Points Question 1 of 6 A university administrator was interested in determining if there was a difference in the distance students travel to get from class from their current residence(in miles). Men and women at UF were randomly selected. The Minitab output is below. What is the best interpretation for the output? Difference = mu (F) ­ mu (M) T­Test of difference = 0 (vs not =): T­Value = ­1.05 P­Value = 0.305 DF = 21 A.With a p­value of 0.305, we do have statistically significant evidence that the population mean distance traveled to class is the same for men and women at UF. B.With a p­value of 0.305, we do have statistically significant evidence that the population mean distance traveled to class is different for men and women at UF. C.With a p­value of 0.305, we do not have statistically significant evidence that the population mean distance traveled to class is different for men and women at UF. D.With a p­value of 0.305, we do not have statistically significant evidence that the population mean distance traveled to class is the same for men and women at UF. Feedback: Remember: "p­value < alpha Reject Ho" and "p­value > alpha Fail to Reject Ho." Part 2 of 6 ­ 1.0/ 1.0 Points 1.0/ 1.0 Points Question 2 of 6 An agricultural field test compares two varieties of corn, silver queen and country gentlemen. The researches takes 10 plots and divides each of these plots in half. Each plot has a similar amount of sun light, shade, quality of soil and irrigation. The variety of corn is randomly chosen for each half of a plot. After the harvest, the yield of corn is measured for each half plot at each location. The yield from silver queen was compared to the yield of country gentlemen. Note: Differences were taken by taking Silver Queen ­ Country Gentlemen The 95% confidence interval for the mean is (­0.223, 0.988). What is the correct interpretation of this interval? A.There is convincing evidence that variety A has a higher mean yield. B.There is not enough evidence to say that variety A has a higher mean yield then variety B. C.We have sufficient evidence to show that variety B has a higher mean yield than variety A. D.There is evidence to show that there is a difference between variety A and variety B. Part 3 of 6 ­ 1.0/ 1.0 Points Question 3 of 6 1.0/ 1.0 Points A scientist was interested in studying if students beliefs about binge drinking change as they go through college. Forty randomly selected students were asked before they entered college if they thought that binge drinking was ­1d92­40b4­a137­7b83eeeed0ee/jsf/delivery/deliverAssessment# 1/3 5/4/2015 EC quiz 2 wrong or o.k. Four years later, the same forty students were asked if thought that binge drinking was wrong or o.k. The scientist decided to perform McNemar's test. The data is below. Are the assumptions met? After College Before College O.K. Wrong O.K. 15 8 Wrong 5 12 A.Yes, n is greater than 15. B.Yes, n is greater than 30. C.Yes, YN + NY is greater than or equal to 30. D.No, n is not greater than 30. E.No, YN + NY is not greater than or equal to 30. Feedback: The assumption of McNemar's Test is that the counts for NY+YN must be greater than or equal to 30. Part 4 of 6 ­ 1.0/ 1.0 Points 1.0/ 1.0 Points Question 4 of 6 Someone has conducted a study to see if there is increased risk of getting lung cancer if you work in a coal mine. In group 1, 30 of the 150 coal miners got lung cancer. In group 2, 5 out of the 250 non­ coal miners got lung cancer. What is the sample relative risk? A.0.2 B.6 C.10 D.100 Feedback: Remember the relative risk equals prop1 / prop2. Part 5 of 6 ­ 1.0/ 1.0 Points 1.0/ 1.0 Points Question 5 of 6 Do graduates from UF tend to have a higher income than students at FSU, five years after graduation? A random sample of 100 graduates was taken from both schools. Let muf be the population mean salary at UF and let mufsu be the population mean salary at FSU. How should we write the alternative hypothesis? A.Ha: mufsu ­ muf = 0 B.Ha: mufsu ­ muf > 0 C.Ha: mufsu ­ muf < 0 D.Ha: mufsu ­ muf does not equal 0 Part 6 of 6 ­ 1.0/ 1.0 Points ­1d92­40b4­a137­7b83eeeed0ee/jsf/delivery/deliverAssessment# 2/3 5/4/2015 EC quiz 2 1.0/ 1.0 Points Question 6 of 6 Doctors are interested in determining if men prefer colder temperatures than women. Thirty women and thirty men were asked to state their ideal room temperature. What type of test would they conduct to test this claim? A.One mean B.comparing two independent proportions C.comparing means of 2 independent samples Feedback: Correct, we are comparing two independent groups and the data is quantitative. D.one proportion E.comparing means of dependent samples F.comparing proportions of dependent samples. ­1d92­40b4­a137­7b83eeeed0ee/jsf/delivery/deliverAssessment# 3/3 ...
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