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in a sample of 86 college stuents has a mean earnings of $3120 with a sample standard deviation of $677 over the summer months. determine
in a sample of 86 college stuents has a mean earnings of $3120 with a sample standard deviation of $677 over the summer months. determine whtehr a normal distibutino (z-values) or a t-distribution should be used or whether theither cna be used to construct a confidence interval. assume the distirbution of weekly food expenses is normally shaped
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