Question

A publisher sends advertising material for a statistics text to 90% of all professors teaching the appropriate statistics course. Twenty-five percent of the professors who received this material adopted the book. Fifteen percent of the professors who did not receive the material also adopted the book. If a professor adopts the book, what is the probability that he has received the advertising material?

Select one:

a. 0.2500

b. 0.9375

c. 0.0375

d. 0.2250

“Is live lecture over Zoom an effective way to conduct online lectures?” A pilot sample of 50 students of UM reveals that 18 of them gave a positive response. If a researcher wants to estimate the proportion of positive responses from all the students of UM, what should be the minimum sample size used if she wants the width of a 95% confidence interval estimate to be 0.10?

Select one:

a. 97

b. 355

c. 89

d. 385

Answer 1