# Question

A simple random sample of 25 observations is derived from a normally distributed population with a known standard deviation of 8.2.

a. Is the condition that is normally distributed satisfied? Explain.

b. Compute the margin of error with 80% confidence.

c. Compute the margin of error with 90% confidence.

d. Which of the two margins of error will lead to a wider interval?

a. Is the condition that is normally distributed satisfied? Explain.

b. Compute the margin of error with 80% confidence.

c. Compute the margin of error with 90% confidence.

d. Which of the two margins of error will lead to a wider interval?

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