choose the correct answer:

A random sample of 25 college males was obtained and each was asked to report their actual height and what they wished as their i~al Might. A 95% confidence Interval for d =average difference between their Ideal and actual heights was 0.8" to 2.2". Based on confidence Interval, which one of the null hypotheses below (versus a two-sided alternative) can be rejected?

a. Ho:1 -2 = 2.0

b.Ho: 1-2 =1.0

c. Ho: 1 -2 =0.5

d. Ho: 1-2=1.5

QUESTION 4 2 points Sav A prospective observational study on the relationship between sleep deprivation and heart disease was done by Ayas, et. al. (Arch Intern Med 2003). Women who slept at most 5 hours a night were compared to women who slept for 8 hours a night (reference group). After adjusting for potential confounding variables like smoking, a 95% confidence interval for the relative risk of heart disease was (1.10, 1.92). Based on this confidence interval, a consistent conclusion would be a. There was no evidence of an association between sleep deprivation and heart disease. b. Lack of sleep causes the risk of heart disease to increase by 10% to 92%. Oc. Sleep deprivation is associated with a modestly decreased risk of heart disease. Od. Sleep deprivation is associated with a modestly increased risk of heart disease. QUESTION 5 1 points Sa For the next two questions: It is known that for right-handed people, the dominant (right) hand tends to be stronger. For left-handed people who live in a world designed for right-handed people, the same may not be true. To test this, muscle strength was measured on the right and left hands of a random sample of 15 left-handed men and the difference (left - right) was found. The alternative hypothesis is one-sided (left hand stronger). The resulting t-statistic was 1.80. 15. This is an example of: Oa. An unpooled t-test. Ob. A paired t-test. c. A two-sample t-test. Od. A pooled t-test