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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
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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- Spring '08
- Statistics, Infantry battalions of the United States Marine Corps, statistically significant evidence, higher mean yield