A research study wishes to examine the proportion of hyperte

A research study wishes to examine the proportion of hypertensive individuals among three different groups of exercises: marathon runners, yoga, and CrossFit. Of the 78 marathon runners, 14 are hypertensive. Of the 63 yoga practioners, 6 are hypertensive. And there are 16 hypertensive subjects among the 54 CrossFit athletes.

a. 6.98

b. 7.83

c. 6.23

d. 8.75

Solution

Consider the expected value table:

  
          
Using chi^2 = Sum[(O - E)^2/E],          
          
chi^2 =    7.83110379 = 7.83 [OPTION B]