{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

MasterQuiz2

# MasterQuiz2 - Chapter 1 1 A randomized experiment was done...

This preview shows pages 1–3. Sign up to view the full content.

Chapter 1 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. This is a randomized experiment rather than an observational study because A. the participants were randomly assigned to either walk or read, rather than choosing their own activity. B. blood pressure was measured at the beginning and end of the study. C. the two groups were compared at the end of the study. D. a random sample of participants was used. The participants were randomly assigned. Points Earned: 1/1 Correct Answer: A Your Response: A 2. 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 A. it can be concluded that the difference in activity caused a difference in the change in blood pressure. B. whether or not the difference was caused by the difference in activity depends on what else the participants did during the year. C. it cannot be concluded that the difference in

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
activity caused a difference in the change in blood pressure because in the course of a year there are lots of possible confounding variables. D. 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. You could conclude that the difference in activity caused the difference in blood pressure change. Points Earned: 1/1 Correct Answer: A Your Response: A 3. An organization would like to conduct a survey of a sample of their membership to make
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 10

MasterQuiz2 - Chapter 1 1 A randomized experiment was done...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online