Use the Sign Test to Test the Indicated Claim

Multiple Choice

Use the sign test to test the indicated claim. A researcher wishes to test whether a particular diet has an effect on blood pressure. The blood pressure of 24 randomly selected adults is measured. After one month on the diet,
Each person's blood pressure is again measured. For 18 people, the second blood pressure reading was lower
Than the first, and for 6 people, the second blood pressure reading was higher than the first. At the 0.01
Significance level, test the claim that the diet has an effect on blood pressure. What would be the value of the test
Statistic, x?

A) 19
B) 5
C) 13
D) 6