In Delaware, cars are inspected each year using state-operated inspection centers. The Wilmington center has three drive-through lanes where cars are inspected in a sequence of steps and would like to test to determine if a difference exists in the median wait time between lanes. The following data show the number of minutes that a random sample of drivers spent waiting and having their cars inspected in the three lanes each day of the week.
Using
α = 0.05, which one of the following statements is true?
▸ Because the test statistic is greater than the critical value, we can conclude that a difference exists in the median wait time between lanes.
▸ Because the test statistic is greater than the critical value, we cannot conclude that that a difference exists in the median wait time between lanes.
▸ Because the test statistic is less than the critical value, we can conclude that that a difference exists in the median wait time between lanes.
▸ Because the test statistic is less than the critical value, we cannot conclude that that a difference exists in the median wait time between lanes today.
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