According to the American Automobile Association, the average cost of a gallon of regular unleaded fuel at gas stations in January 2019 was $3.5. Assume that the standard deviation of such costs was $4.75. Suppose that a random sample of 56 gas stations was selected from the population and the cost per gallon of regular unleaded fuel was determined for each gas station. Consider X¯bar, the sample mean cost per gallon. (a) Describe the sampling distribution of X¯bar. (b)Find the probability that the sample had a mean fuel cost between $3.8 and $4. (c) How would the sampling distribution of X¯bar change if the sample size were doubled?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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According to the American Automobile Association, the average cost of a gallon of regular unleaded fuel at gas stations in January 2019 was $3.5. Assume that the standard deviation of such costs was $4.75. Suppose that a random sample of 56 gas stations was selected from the population and the cost per gallon of regular unleaded fuel was determined for each gas station. Consider X¯bar, the sample mean cost per gallon.

(a) Describe the sampling distribution of X¯bar.

(b)Find the probability that the sample had a mean fuel cost between $3.8 and $4.

(c) How would the sampling distribution of X¯bar change if the sample size were doubled?

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