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We want to estimate the mean weight of all 7th grade boys in a city. It is not known whether the distribution of the weights is normal or not. Suppose we have a random sample of 64 boys from 7th grade from that city and suppose the mean weight of these 64 boys is 50 Kilograms and the standard deviation is 5.6 kilograms. What is the 95% confidence interval for the mean weight (in Kilograms) of all boys in 7th grade in that city?

50 ± 1.96*5.6

50 ± 1.96*5.6/64

50 ± 1.96*5.6/8

50 ± 1.645*5.6/8

We want to estimate the mean weight of all 7th grade boys in a city. It is not known whether the distribution of the weights is normal or not. Suppose we have a random sample of 64 boys from 7th grade from that city and suppose the mean weight of these 64 boys is 50 Kilograms and the standard deviation is 5.6 kilograms. What is the 99% confidence interval for the mean weight (in Kilograms) of all boys in 7th grade in that city?

50 ± 2.33*5.6

50 ± 2.33*5.6/64

50 ± 2.33*5.6/8

50 ± 2.575*5.6

50 ± 2.575*5.6/8

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