1.

A randomized experiment was done by randomly assigning each participant either to walk for half an hour three times a week or to sit quietly reading a book for half an hour three times a week. At the end of a year the change in participants' blood pressure over the year was measured, and the change was compared for the two groups. If a statistically significant difference in blood pressure change at the end of a year for the two activities was found, then:

Group of answer choices

a}Whether or not the difference was caused by the difference in activity depends on what else the participants did during the year.

b] It can be concluded that the difference in activity caused a difference in the change in blood pressure because of the way the study was done.

c] It cannot be concluded that the difference in activity caused a difference in the change in blood pressure because it might be the opposite, that people with high blood pressure were more likely to read a book than to walk.

d] It cannot be concluded that the difference in activity caused a difference in the change in blood pressure because in the course of a year there are lots of possible confounding variables.

2] A researcher wants to find out if the variable "Number" has something to do with "DxPost"

What decision should be made in this hypothesis test?

Group of answer choices

a]do not reject the null hypothesis

b]] accept the null hypothesis

c] None of these is correct.

d] reject the null hypothesis

3]A researcher wants to find out if the variable "Number" has something to do with "DxPost"

What decision should be made in this hypothesis test?

Group of answer choices

a] do not reject the null hypothesis

b] accept the null hypothesis

c] None of these is correct.

d] reject the null hypothesis