Johnson is hired by a company to see if a new product, Topocal, will cause hair to grow on the heads of bald men. He recruits one thousand bald men and randomly divides them into two groups: Five hundred men (group A) rub Topocal on their scalps each day; the other five hundred (group B) rub a standard skin lotion on their scalps each day. After two months, Johnson checks to see what the results have been. He finds that there has been hair growth in 7 percent of group A and in 2 percent of group B)Given the size of Johnson's two groups, would you say that the results of the test are statistically significant?
A)yes
B)no
C)no way to tell

Question

Quizplus · Accepted Answer

The difference in hair growth between the two groups (7% in group A vs. 2% in group B) suggests that Topocal may have an effect on hair growth. Given the sample size of 500 in each group, this difference is likely to be statistically significant, indicating that the observed effect is not due to chance.

Johnson Is Hired by a Company to See If a New