The mean waiting time at the drive-through of a fast-food
restaurant form the time an order is placed to the time the order
is received is 84.3 seconds. A manager devises a new
drive-through system that he believes will decrease the wait
time. To test his claim, he initiates the new system at his
restaurant and measures the wait time for 45 randomly selected
orders and finds the sample mean to be 81.9 and a sample standard
deviation of 17.3. Using a significance level of 0.01, has
the wait time significantly decreased?
Select the appropriate hypothesis statements for this
test.
what is the t stat and p-value