Which statement is NOT true concerning the t distribution?
Select one:
a. Compared to the normal distribution, the t distribution has more area in the tails and less in the center.
b. As the number of degrees of freedom increases, the t distribution approaches the normal distribution. Incorrect
c. The t distributions are skewed to the left.
d. The population variance is unknown and is estimated by the sample variance s2.
e. As the sample size increases beyond 120, the t and Z distributions are indistinguishable.
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The correct answer is: The t distributions are skewed to the left.
Question 2
Incorrect
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Which of the following involves a test of two-independent samples?
Select one:
a. Test of differences in the percent of men and women who are or are not members of Greek organizations on campus
b. Test of the average incomes of magazine subscribers of Southern Living verses Better Homes and Gardens
c. Test of whether the mean salary of professors at Metro University is higher than the national average for university professors Incorrect
d. Test of whether a change occurred in the likelihood of heart disease among people who switched to a diet high in fish
e. Test of differences in ad recall among three experimental groups (each of which saw a different advertisement) and a control group
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The correct answer is: Test of the average incomes of magazine subscribers of Southern Living verses Better Homes and Gardens
Question 3
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Under which of the following conditions must the null hypothesis be rejected?
Select one:
a. p value < equation Correct
b. p value > equation
c. p value = equation
d. p value cannot be determined
e. p value is unrelated to hypothesis testing
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The correct answer is: p