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A smartphone company is comparing the American market for smartphones to the Canadian market for smartphones....

A smartphone company is comparing the American market for smartphones to the Canadian market for smartphones. They take a sample of 400 Americans and find 328 own a smartphone, and a sample of 300 Canadians of which 257 own a smartphone. Find a 98% confidence interval for the difference in the proportions of Americans and Canadians who own a smartphone.

Math   Statistics-And-Probability   
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Answer #1

Given :

Xlx1 = 328

n1 = 400

and

x2 = 257

n2 = 300

significance level ,

= 1-98/100 = 0.02

a 98% confidence interval for the difference in the proportions of Americans and Canadians who own a smartphone is ( - 0.1047 , 0.0247 )

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