Suppose the returns of a particular group of mutual funds are normally

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A county is considering raising the speed limit on a road because they claim that the mean speed of vehicles is greater than 35 miles per hour. a random sample of 15 vehicles has a mean speed of 39 miles per hour and a standard deviation of 5.2 miles per hour. at (confidence interval) = 0.01, do you have enough evidence to support the countys claim?

whats the claim?

whats the t-statistic?

whats the p-value?

decide whether to reject or fail?

interpret the decision in the context of the original claim?