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Show work, calculation, and answer. 4. In a random sample of 49 gas stations, the average price per gallon is $2.89. Assuming the population standard

Show work, calculation, and answer.

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4. In a random sample of 49 gas stations, the average price per gallon is $2.89. Assuming the population standard deviation to be $0.14. a) Compute the 97 percent confidence interval for the average price per gallon of gas. b) What is the sample size needed if you wish to estimate the average price with in $0,26, using a confidence level of 97 percent, the standard deviation being $0.14 15 points

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