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9 October, 07:21

Alice wanted to compare birthday cake prices in two supermarkets. She wrote down the daily prices for a few days and found that the difference of the two sample means is $4.01. The standard deviation of the difference of the sample means is $5.46. The 95% confidence interval of the sample mean difference is between and

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  1. 9 October, 10:08
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    If a is mean and b is the standard deviation then 95 % of data is found in this interval (a-2b, a+2b)
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