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)6
C)13
D)5

Question

Quizplus · Accepted Answer

The test statistic, $x$, in a sign test is the number of observations in the smaller group, which in this case is 6 (the number of people whose blood pressure was higher after the diet).

Use the Sign Test to Test the Indicated Claim