Question

A medical researcher is interested in determining if there is a relationship between adults over 50 who walk regularly and low, moderate, and high blood pressure. A random sample of 236 adults over 50 is selected and the results are given below:

70.8, 27.1, 66.2, 20.8
Find the expected frequency E2,2 to test the claim that walking and low, moderate, and high blood pressure are not related.

Answer 1

c. 66.2

Explanation:

expected frequency=

Eij= row total in the ith row* column total in the jth column/ (Grand total of te frequency

Eij=137*114/(236)

Eij=15502/236

66.2 approximate

lw mod high

walker 32 68 22 122

non walker 24 69 21 114

56 137 43 236 Total

ly