How to Find the Confidence Interval for the Mean with Small Samples and Sigma Unknown. [HD]

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Refer to a sample of 22 households that used an average of 346.2 gallons of water per day, with a standard deviation of 50.5 gallons. Assume the population of household water usage is normally distributed. Calculate the 80% confidence interval.




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Tags:
Math
mathematics
word problem
probability
normal distribution
t score
Sampling Distribution
confidence interval