Corazon Pharmaceuticals Is Testing the Effectiveness of Its New Blood

Multiple Choice

Corazon Pharmaceuticals is testing the effectiveness of its new blood pressure medication.A study involving 200 patients with high blood pressure has been conducted in which patients were classified by their daily physical activity level (low, moderate, and high) .The 200 patients in the sample were each given the same dosage of the medication.Results from the sample are given below.You plan to use a chi-square test of independence to test a null hypothesis that the effectiveness of the medication is independent of the patient's daily level of physical activity. If the "independence" null hypothesis is true, how many of the "moderate" activity level patients in the sample would you expect to show "substantial improvement"?

A) 16.8
B) 14.7
C) 30.3
D) 13.3