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We are interested in how much this week's average gasoline price has changed compared to the all-time high of $\$4.11$ per gallon.
What would be the purpose of calculating a confidence interval in this case?
To use a sample statistic to estimate the value of a population parameter.
To use $\mu$ to estimate the value of a sample mean.
To use the sample mean to determine a level of confidence.
To use a level of confidence to estimate a sample proportion.