Question

Pizza companies are competitive in the amount of time it takes to deliver the pizza. Is...

  1. Pizza companies are competitive in the amount of time it takes to deliver the pizza. Is there a significant difference in the average time it takes to deliver a pizza between Pizza Hut and Dominos? The following data was collected from a sample of deliveries of both companies; test the hypothesis at a 0.01 level of significance with 10 degrees of freedom(assume unequal variances). Pizza Hut: sample mean = 18.68, sample standard deviation = 1.64, sample size = 5 Dominos: sample mean = 20.23, sample standard deviation = 2.74, sample size = 7. Find the corresponding critical value(s) at a 0.01 level of significance.
    ±2.575
    ±2.33
    ±2.764
    ±3.169
Math   Statistics-And-Probability   
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Answer #1

Solution :

df = 9.8~10

= 0.01

/ 2 = 0.01 / 2 = 0.005

t 0.005,10 = 3.169

Critical value = 3.169

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