An advertisement for a popular weight-loss clinic suggests that participants in its new diet program lose, on average, more than 10 pounds. A consumer activist decides to test the authenticity of the claim. She follows the progress of 18 women who recently joined the weight-reduction program. She calculates the mean weight loss of these participants as 10.8 pounds with a standard deviation of 2.4 pounds. The test statistic for this hypothesis would be ________.
A) 1.41
B) −1.41
C) 1.74
D) −1.74

Question

Quizplus · Accepted Answer

The test statistic for this hypothesis would be 1.41. This is calculated by taking the difference between the sample mean and the hypothesized mean (10.8 - 10 = 0.8) and dividing it by the standard deviation (0.8 / 2.4 = 1.41).

An Advertisement for a Popular Weight-Loss Clinic Suggests That Participants