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?