STATISTIC 101 A random sample of 49 lunch customers was taken at a restaurant

| March 14, 2016

Question
1) A random sample of 49 lunch customers was taken at a restaurant. The average amount of time the customers in the sample stayed in the restaurant was 33 minutes. From past experience, it is known that the standard deviation equals 10 minutes. Construct a 99% confidence interval for the true average amount of time customers spent in the restaurant.

2) In order to determine an interval for the mean of a population with unknown standard deviation a sample of 25 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is?

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