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 15 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 1.9 pounds. The test statistic for this hypothesis would be _______.

Multiple Choice

• z= 1.631
• t₁₄= 1.631
• z= 1.631
• t₁₄= 1.631