Chapter 9

Question 1

critical value of z

Answer 1

the z-value that defines a significant result; the position in the sampling distribution of means that defines the rejection region in a z-test

Question 2

rejection region

Answer 2

the proportion of the sampling distribution of means containing the outcomes that will cause rejection of the null hypothesis

Question 3

alpha level

Answer 3

the probability or position in the sampling distribution of means, that defines an unlikely observation if the null is true; the size of the rejection region

Question 4

p value

Answer 4

the probability that the sample mean is in the rejection region by random chance alone

Question 5

z test

Answer 5

an inferential test used to compare the mean of a single sample with the mean of a population

Question 6

z statistic

Answer 6

the ratio of the difference between a sample mean and the mean of the population divided by the standard error

Question 7

type I error

Answer 7

the decision to reject a true null

Question 8

type II error

Answer 8

the decision to accept a false null