Find confidence interval for average amount spent

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Reference no: EM13120566

Collete is self-employed, selling stamps at home parties. She wants to estimate the average amount a client spends at each party. A random sample of 35 clients' receipts gave a mean of $34.70 with standard deviation s= $4.85.

a. Find a 90% confidence interval for the average amount spent by all clients

b. What conditions are necessary for your calculations?

b. For a party with 35 clients, use part (a) to cstimate a range of dollar values for Collete's total sales at that party.

Reference no: EM13120566

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