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Mathematics 7 Online
OpenStudy (anonymous):

PLEASE HELP!!!! Alice wants to compare whether the price on a birthday cake in two supermarkets differs significantly. She wrote down the daily prices for the last few days and found the difference between the sample means to be $4.01. If the standard deviation of the difference between sample means is $5.46, what is the 95% confidence interval of the sample mean difference? a:between -8.02 and +8.02 b:between -10.92 and +10.92 c:between -12.03 and +12.03 d: between -16.38 and +16.38

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