Domino’s Pizza in Big Rapids, Michigan, advertises that they will deliver your pizza in less than 15 minutes of placing an order or it is free. A sample of 25 customers is selected at random. The average delivery time in the sample was 14 minutes with a sample standard deviation of 4 minutes. Test to determine if we can infer at the 5% significance level that the Domino’s claim is correct.
his is the left tailed test .
The null and alternative hypothesis is
H0 : = 15
Ha :
< 15
Test statistic = t
= (
-
) / s /
n
= (14 - 15) / 4 /
25
= -1.25
Test statistic = -1.25
df = 24
P-value = 0.1117
= 0.05
P-value >
Fail to reject the null hypothesis .
Domino’s claim is not correct.
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