A medical center wishes to test the claim that there is a difference between two different over-night delivery companies with respect to the speed with which they deliver the items. The average speed of delivery over a 40 day period is shown below: 2. Company A x=14 Company B Xg = 16 S4 = 2.9 Sg = 3.1 n = 40 ng = 40 a) Construct a 98% confidence interval for the true mean difference in average delivery times between the two companies. b) Using a = 0.05, is there enough evidence to support the claim that there is a difference between the average delivery times for the two companies? Find the p-value for the test.

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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2.
A medical center wishes to test the claim that there is a difference between two different over-night
delivery companies with respect to the speed with which they deliver the items. The average speed of
delivery over a 40 day period is shown below:
Company A
x, =14
Company B
Xg = 16
S4 = 2.9
SB = 3.1
n¸ = 40
ng = 40
a) Construct a 98% confidence interval for the true mean difference in average delivery times between
the two companies.
b) Using a = 0.05, is there enough evidence to support the claim that there is a difference between the
average delivery times for the two companies? Find the p-value for the test.
Transcribed Image Text:2. A medical center wishes to test the claim that there is a difference between two different over-night delivery companies with respect to the speed with which they deliver the items. The average speed of delivery over a 40 day period is shown below: Company A x, =14 Company B Xg = 16 S4 = 2.9 SB = 3.1 n¸ = 40 ng = 40 a) Construct a 98% confidence interval for the true mean difference in average delivery times between the two companies. b) Using a = 0.05, is there enough evidence to support the claim that there is a difference between the average delivery times for the two companies? Find the p-value for the test.
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