Johnson Is Hired by a Company to See If a New

Multiple Choice

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 (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