Author Question: When +1.645 is used as the critical value instead of 1.96, a. the total probability of the region ... (Read 25 times)

HCHenry · **on:** Jun 20, 2018

When +1.645 is used as the critical value instead of 1.96,

a. the total probability of the region of rejection is decreased.
b. the total probability of the region of rejection is increased.
c. the region of rejection is all placed in the positive tail.
d. the region of rejection is all placed in the negative tail.

Question 2

In a test of physical fitness, a group of men ages 65 and older from a local retirement community were told to do as many sit-ups as they could. It is known that the population mean is 20 with . The scores for the men from the retirement community are given below. Use a two-tailed rejection region with a total area of 0.05 . What should you conclude? 24 25 10 23 18 29 47 32 19 24 20 28 21 20 27 25

a. Since the z-value falls within the region of rejection, we should conclude this sample mean likely represents some other population.
b. Since the z-value does not fall within the region of rejection, we should not conclude this sample mean represents some other population.
c. Since the z-value falls within the region of rejection, we should not conclude this sample mean represents some other population.
d. Since the z-value does not fall within the region of rejection, we should conclude this sample mean likely represents some other population.