Recall the previous exercise about estimating energy expenditure (EE). The previous exercise also reports the summary statistics for the difference in EE (estimate ˆ’ actual).

a. Use the formula of the standardized statistic

to calculate its value. Interpret the value of the standardized statistic in the context of the study.

b. Use the formula for the confidence interval

to calculate the 95% confidence interval.

Data from previous exercise

How many calories do you think you burn or expend with 60 minutes of walking on the treadmill? An article that appeared in the American Journal of Men€™s Health (2010) presented the results of a study conducted by researchers Harris and George, whose objective was to evaluate how accurately men can estimate their energy expenditure (EE) as measured in kilocalories (kcal). Eighty normal-weight and overweight male participants, ages 21€“45 years, were recruited from a large, urban university in South Florida. During one session, each participant was made to walk for 60 minutes on a treadmill, and their actual EE was calculated. Aft er they had completed the task, each participant was asked to estimate the number of calories they burned during the task. A summary of the results are shown in the following table.

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