Question: Find the sample size necessary to estimate the mean weight of all supermodels so that there is 95% confidence that the sample mean is in

Find the sample size necessary to estimate the mean weight of all supermodels so that there is 95% confidence that the sample mean is in error by no more than 2 lb. Assume that a pilot study suggests that the weights of all supermodels have a standard deviation of 7.5 lb.

Use the following weights (in pounds) of randomly selected supermodels.

125 (Taylor) 119 (Auermann) 128 (Schiffer) 125 (Bundchen) 119 (Turlington) 127 (Hall)

125 (Taylor) 119 (Auermann) 128 (Schiffer) 125 (Bundchen) 119 (Turlington) 127 (Hall) 105 (Moss) 123 (Mazza) 110 (Reilly) 103 (Barton)

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