The waiting time (in minutes) at the cashier of two supermarket
chains with different cashier systems is compared. The following
statistical test was performed:
Two Sample t-test
data: Waiting by Supermarket
t = 3.8575, df = 132, p-value = 0.9999
alternative hypothesis: true difference in means is less than 0
95 percent confidence interval:
mean in group Sparag mean in group Consumo
Which of the following statements are correct? (Significance level
The absolute value of the test statistic is larger than 1.96.
A one-sided alternative was tested.
value is larger than
The test shows that the waiting time is longer at Sparag than at Consumo.
The test shows that the waiting time is shorter at Sparag than at Consumo.
True. The absolute value of the test statistic is equal to 3.857.
True. The test aims at showing that the difference of means is smaller than
value is equal to
False. The test aims at showing that the alternative that the waiting time is shorter at Sparag than at Consumo. The test result is not significant (
False. The test result ist not significant (