Use the following information for questions:
A new study finds that frequent use of painkillers does not substantially increase a healthy man's risk of developing hypertension (high blood pressure). In other words, the proportion of healthy men with hypertension is the same for those who use painkillers frequently and those who don't. According to the American Heart Association, 1 in 3 American adults have hypertension.
-Suppose random samples of 200 men who use painkillers frequently and 200 men who don't are to be selected. What is the standard deviation for the difference between the two sample proportions?
A) 0
B) 0.0333
C) 0.0471
D) 0.5773

Question

Use the following information for questions:
 A new study finds that frequent use of painkillers does not substantially increase a healthy man's risk of developing hypertension (high blood pressure). In other words, the proportion of healthy men with hypertension is the same for those who use painkillers frequently and those who don't. According to the American Heart Association, 1 in 3 American adults have hypertension.
-Suppose random samples of 200 men who use painkillers frequently and 200 men who don't are to be selected. What is the standard deviation for the difference between the two sample proportions?
A) 0
B) 0.0333
C) 0.0471
D) 0.5773

Quizplus · Accepted Answer

The standard deviation for the difference between two independent sample proportions is calculated using the formula: sqrt[(p(1-p)/n1) + (p(1-p)/n2)], where p is the population proportion (1/3) and n1 and n2 are the sample sizes (both 200).

Use the Following Information for Questions