Confidence interval for the daily sales at all restaurants

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A sample of the sales at 50 Haute Dog restaurants is taken and the sample mean is $30,000 per day. with a sample standard deviation of $2000. The population standard deviation is not known.

A. What is the 90% confidence interval for the daily sales at all restaurants.

B. What is the probability that the average sales are really $32,000 or more per day? Assume that the population average is $30,000 per day and the std. Deviation is $2k.

Reference no: EM1389569


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