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Q4. A researcher wanted to estimate the difference between the percentages of users of two brands of drinking water who will never switch to another brand. In a sample of 600 users of Brand A taken by this researcher, 120 said that they will never switch to another brand. In another sample of 500 users of Brand B taken by the same researcher, 80 said that they will never switch to another brand. Let pi and p2 be the proportions of all users of Brands A and B, respectively, who will switch to another brand. (a) What is the point estimate of p: - p2? (b) Construct a 95% confidence interval for the difference between the proportions of all users of the two brands who will switch and interpret the result. (c) Mention the value for margin of error with formula.

Q4. A researcher wanted to estimate the difference between the percentages of users of two brands of drinking water who will never switch to another brand. In a sample of 600 users of Brand A taken by this researcher, 120 said that they will never switch to another brand. In another sample of 500 users of Brand B taken by the same researcher, 80 said that they will never switch to another brand. Let pi and p2 be the proportions of all users of Brands A and B, respectively, who will switch to another brand. (a) What is the point estimate of p: - p2? (b) Construct a 95% confidence interval for the difference between the proportions of all users of the two brands who will switch and interpret the result. (c) Mention the value for margin of error with formula.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Bus-173 (Applied Statistics) :

Q4. A researcher wanted to estimate the difference between the percentages of users of two brands of drinking water who will never switch to another brand. In a sample of 600 users of Brand A taken by this researcher, 120 said that they will never switch to another brand. In another sample of 500 users of Brand B taken by the same researcher, 80 said that they will never switch to another brand. Let pi and p2 be the proportions of all users of Brands A and B, respectively, who will switch to another brand. (a) What is the point estimate of p: - p2? (b) Construct a 95% confidence interval for the difference between the proportions of all users of the two brands who will switch and interpret the result. (c) Mention the value for margin of error with formula.
Transcribed Image Text:Q4. A researcher wanted to estimate the difference between the percentages of users of two brands of drinking water who will never switch to another brand. In a sample of 600 users of Brand A taken by this researcher, 120 said that they will never switch to another brand. In another sample of 500 users of Brand B taken by the same researcher, 80 said that they will never switch to another brand. Let pi and p2 be the proportions of all users of Brands A and B, respectively, who will switch to another brand. (a) What is the point estimate of p: - p2? (b) Construct a 95% confidence interval for the difference between the proportions of all users of the two brands who will switch and interpret the result. (c) Mention the value for margin of error with formula.
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