Quiz 5(6)

# Quiz 5(6) - Quiz 5 Estimation Name due Friday 12/9 1 A...

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Quiz 5 Estimation Name______________________ 11/18/2011, due Friday, 12/9 1. A random sample of 14 evenings (6 to 9 P . M .) at the O’Sullivan household showed the family received an average of = 5.2 solicitation phone calls each evening. The sample standard deviation was s = 1.9, σ in unknown. Find a 95% confidence interval for the population mean number of solicitation calls this family receives each night. Write a brief explanation of the meaning of the confidence interval in the context of this problem. 2. Jordan is the manager of a used book store. He wants to estimate the average amount a customer spends per visit. A random sample of 80 customer receipts gave a mean of = \$6.90 with standard deviation , s = \$2.45. Remember n is greater than or equal to 30 a. Find a 90% confidence interval for the average amount spent by all customers. b. What conditions are necessary for your calculations? c.

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## This note was uploaded on 12/10/2011 for the course BUS 222 taught by Professor Penna during the Spring '11 term at St. Josephs NY.

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Quiz 5(6) - Quiz 5 Estimation Name due Friday 12/9 1 A...

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