Find confidence interval for average amount left by groups

Reference no: EM13114028

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 42 groups gave a mean of $7.30. Based on long term experience, the standard deviation can be taken to be $2.92. Find a 90% confidence interval for the average amount left by all groups.

Reference no: EM13114028

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