Twenty-Five Patients at a Large Clinic Volunteer to Participate in a Study

Multiple Choice

Twenty-five patients at a large clinic volunteer to participate in a study focusing on weight loss. These 25 patients had a mean weight loss score of x̄= 4500 g over two weeks. Suppose we know that the standard deviation of the population of weight changes on this particular diet is σ= 100 g. Assume the population of weight losses is approximately Normally distributed. What is a 90% confidence interval for the mean weight loss μ for the population, based on the collected data?

A) 450 ± 32.9
B) 450 ± 39.2
C) 450 ± 164.5
D) The confidence interval is not trustworthy.