Determine the most conservative sample size for the estimation of the population proportion for the following. E=0.022, confidence level=95% Round your answer up to the nearest whole number....

Determine the most conservative sample size for the estimation of the population proportion for the following.

E=0.022, confidence level=95%

Round your answer up to the nearest whole number.

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A city planner wants to estimate the average monthly residential water usage in the city. He selected a random sample of 38 households from the city, which gave the mean water usage to be 3406.60 gallons over a one-month period. Based on earlier data, the population standard deviation of the monthly residential water usage in this city is 387.30  gallons. Make a 97% confidence interval for the average monthly residential water usage for all households in this city.


Round your answers to two decimal places.