In 1988, a study followed 89 sedentary men for a year. 42 men were on a diet, and the remaining 47 were on an exercise routine. The group on the diet lost 7.2 kg on average, with a standard deviation of 3.9 kg. Construct a 99.7% confidence interval for the true average number of kg lost on diet.

Q: please explaine how to get 42?

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A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…