Confidence interval for the mean amount left by all groups

Reference no: EM1321692

Latasha is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each group at a table leaves for a tip. A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42. Find a 90% confidence interval for the mean amount left by all groups.

Reference no: EM1321692

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