Question

A sample of 120 men with diabetes were sampled from a Dallas clinic to assess the

success of a weight management program. Their BMIs were calculated from weights and

heights the day they attended. An average BMI of 24.5 was calculated (s.d.=3.8).

A) One man had a BMI of 19.5. Is he “average” or “unusual”? Explain. (Hint: Use

Z-score formula)

B) What if the man with a BMI of 19.5 came from a sample of 60 people (and s.d.

continued to equal 3.8 and average BMI continued to be 24.5); Is this man’s BMI

still “average” or “unusual”. Explain.

Answer 1