Question

The water works commission 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 16.7 gallons per day for a sample of 784 families. Construct the 95% confidence interval for the mean usage of water. Round your answers to one decimal place.

Lower endpoint:

Upper endpoint:

Answer #1

*given data
are:-*

sample mean () = 16.7

population sd () = 2.3

sample size (n) = 784

*z critical value
for 95% confidence level, both tailed test be:-*

**the 95%
confidence interval be:-**

**lower endpoint
= 16.5**

**upper endpoint
= 16.9**

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