Excel instructions when applicable, please. using for notes. Say someone needs to know the mean household usage of water by the residents of a small town in gallons per day. Assume that the population standard deviation is 2.3 gallons. The mean water usage per family was found to be 18.5 gallons per day for a sample of 717 families. Construct the 95% confidence interval for the mean usage of water. a. What is the best point estimate for this problem? b. Find the critical value that should be used for this problem. c. Calculate the margin of error. Round your answer to the first decimal place as needed. d. Construct the 95% confidence interval. Write your answer using the following format: (lower endpoint, upper endpoint). e. Interpret your answer from Part D into a complete sentence using the context of the problem.
Excel instructions when applicable, please. using for notes.
Say someone needs to know the
a. What is the best point estimate for this problem?
b. Find the critical value that should be used for this problem.
c. Calculate the margin of error. Round your answer to the first decimal place as needed.
d. Construct the 95% confidence interval. Write your answer using the following format: (lower endpoint, upper endpoint).
e. Interpret your answer from Part D into a complete sentence using the context of the problem.
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