Assignment #3
Biostatistics 660, Fall 2020

NAME: ___________________________________________________________________

1. Which of the following is true of the standard deviation of a sample mean:

A. it is directly proportion to the square root of its sample size
B. It is equal to the square root of its sample size
C. it is inversely proportion to square root of its sample size.
D. it is the summation of the square root law

2. Select the best response. A particular set of explanatory factors applied in an experiment is call a

A. subject
B. factor
C. treatment

3. Select the best response: This is a description of all possible outcomes for a random variable.

A. an event
B. the sample space
C. probability

4. Select the best response. The area under the curve of pmfs and pdfs correctly correspond to:

A. events
B. probabilities
C. cumulative probabilities

5. The probabilities of disjoint events can be subtracted to get to determine the probability of their union.

A. True
B. False

6. The z-score tells you the distance the value falls from the median in standard deviation units.

A. True
B. False

7. Researchers pre-establish the rate of false rejection of null hypothesis prior to conducting any testing for significance.

A. True
B. False

8. Which of the following best represents the highest potential for nonresponse bias in a sampling strategy? Describe why this option should be considered nonresponse.

A. Surveying a population on Sunday morning to assess community needs
B. Posting a leaflet in the elevator of a university asking for students to take part in a study
C. Asking people leaving a local election to take part in an exit poll
D. Standing outside a local library and asking passing pedestrians to take part in a new drug study

9. Which of the following accurately represents a Type I error?

A. Failing to reject the null hypothesis that a weight loss program shows no benefit after a test statistic results in a p-value of 0.15 at α=.05.

B. Rejecting the null hypothesis that a weight loss program shows no benefit after a test statistic results in a p-value of 0.15 at α=0.05.

C. Failing to reject the null hypothesis that a weight loss program shows no benefit after a test statistic results in a p-value of 0.03 at α=0.10.

D. Rejecting the null hypothesis that a weight loss program shows no benefit after a test statistic results in a p-value of 0.03 at α=0.10.

10. Using the Practicum Data, run a frequency distributions of diastolic blood pressure (DBP) and marital status and interpret the output. (
You do not need to send the output to me
).