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STT 231 EXAM 2 QUESTIONS AND ANSWERS ALL CORRECT

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STT 231 EXAM 2 QUESTIONS AND ANSWERS ALL CORRECT

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STT 231 EXAM 2 QUESTIONS AND
ANSWERS ALL CORRECT

What percentage of books in this library contain fewer than 300 pages?
A) z-interval for a proportion, π
B) z-test for a proportion, π
C) t-interval for a mean, μ
D) t-test for a mean, μ - Answer- A) z-interval for a proportion, π

Suppose you take a random sample of 100 books from a large library. Indicate the
appropriate inference procedure

How many pages, on average, are contained in a book from this library?
A) z-interval for a proportion, π
B) z-test for a proportion, π
C) t-interval for a mean, μ
D) t-test for a mean, μ - Answer- C) t-interval for a mean, μ

Suppose you take a random sample of 100 books from a large library. Indicate the
appropriate inference procedure

What percentage of books in this library have been borrowed at least once in the past
10 years?
A) z-interval for a proportion, π
B) z-test for a proportion, π
C) t-interval for a mean, μ
D) t-test for a mean, μ - Answer- A) z-interval for a proportion, π
How does sample size influence the estimated effect size? - Answer- No effect

How does sample size influence degrees of freedom? - Answer- increase in sample
size, increase in degrees of freedom

How does sample size effect the value of the test statistic "t"? - Answer- increase in
sample size, increase in test statistic

How does sample size influence the p-value? - Answer- as sample size increases, p-
value decreases

How does sample size influence MoE of your confidence interval? - Answer- sample
size increases, MoE of CI decreases

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