Write brief expanation of meaning of confidence interval in

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1. Collette is self-employed, selling items at Home Interior parties. She wants to estimate the average amount a client spends at each party. A random sample of 35 clients' receipts gave a sample mean of $34.70 with population standard deviation $4.85.

1. Should you use the critical value (zc) or (tc) in determining a confidence interval in this problem? Explain.

2. Find a 90% confidence interval for the average amount expected to be spent by an individual.

3. Write a brief expanation of the meaning of the confidence interval in the context of this problem

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

Reference no: EM13470885

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