2. Construct a 85% confidence interval for the population mean weight of the heads of lettuce.

A sample of 28 heads of lettuce was selected. Assume that the population distribution of

head weight is normal. The weight of each head of lettuce was then recorded. The mean

weight was 2.4 pounds with a standard deviation of 0.15 pounds. The population standard

deviation is known to be 0.24 pounds. Round your answer to four decimal places.

Answer:

Answer the Question

3. A sample of 28 heads of lettuce was selected. Assume that the population distribution of

head weight is normal. The weight of each head of lettuce was then recorded. The mean

weight was 2.4 pounds with a standard deviation of 0.15 pounds. The population standard

deviation is known to be 0.24 pounds. What would happen if 24 heads of lettuce were

sampled instead of 28, and the confidence level remained the same?

Answer: