4. In Summer 2017, there were 16 women and 4 men enrolled in GCH 601: Introducti

4) d) all of the above 5) standard error = sqrt(0.5 * 0.5/n) magin of error= 0.03 1.645 * sqrt(0.5 * 0.5/n) = 0.03 n = 748 6) d)

ID: 3362186 • Letter: 4

Question

4. In Summer 2017, there were 16 women and 4 men enrolled in GCH 601: Introduction to

Biostatistics. We used the proportion of men in this sample to test whether the proportion of

men at GMU is significantly different from 10%. Which of the following best explains why this

approach is not appropriate?

a. The observations are not independent.

b. The success-failure condition is met.

c. The sample is not representative

d. All of the above

5. Suppose we want to conduct a study of the proportion of students who prepare home cooked

meals on a regular basis. How many students are required to obtain a 90% confidence interval

that has a margin of error not larger than 0.03?

a. 748

b. 2187

c. 465

d. 13

6. We are interested in determining whether course grade in an Introduction to Epidemiology

course (B or above, C or lower) is associated with degree program (MPH, MS). Which of the

following is true?

a. We cannot apply the F-test because the variables are categorical.

b. All of the solutions provided are true.

c. We could apply a two-sample test of proportion to determine whether the proportion of B

or higher grades varies by program.

d. We cannot apply a t-test in this case because we have two categorical variables.

d) all of the above

standard error = sqrt(0.5 * 0.5/n)

magin of error= 0.03

1.645 * sqrt(0.5 * 0.5/n) = 0.03

n = 748

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