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3. The daily demand at a newsstand for the Ottawa Citizen newspaper follows a normal distribution...

3. The daily demand at a newsstand for the Ottawa Citizen newspaper follows a normal distribution with a standard deviation of 12 newspapers.

(a) The owner of the newsstand selects a random sample of 40 days. The average number of copies of the Ottawa Citizen sold during those 40 days is 57.4. Compute and interpret an appropriate 99% confidence interval for the population mean daily demand for the Ottawa Citizen.

(b) The next time the owner wants compute a confidence interval for the population mean daily demand, they want to be accurate to within 3 newspapers with 99% confidence. How many days would you recommend be sampled for this purpose?

(c) The result in part (a) is valid because a simple random sample was obtained from a normally distributed population. Would the result still be valid even if the daily demand of newspaper sales was right skewed? Explain.

Math   Statistics-And-Probability   
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