Question: A sample of 40 speedometers of a particular type is selected and each speedometer is calibrated for the accuracy at 55 mph, resulting in a sample mean and sample standard deviation of 53.87 and 1.36, respectively. Does this data suggest that the true average reading when the speed is 55 mph is fact something other than 55? State the relevant hypothesis, calculate the value of the appropriate test statistic, determine p-value, or its range, and state the conclusion for a significance level of 0.01.