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tores decided to raise the price of a certain brand of toaster in 20 andomly selected stores (Sample A) and to lower the price in 10 andomly selected stores (Sample B). Monthly revenue (number sales x ales price) from these toasters was recorded for each of the 30 stores. Results from the two samples are as follows: No. of stores Mean Std. Dev. Sample A Sample B $842 $817 $217 $202 20 10 a) If you considered these to be independent samples, what would be the pooled estimate of the standard deviation for revenue? (q the two means. Calculate a 95% confidence interval for the difference between

tores decided to raise the price of a certain brand of toaster in 20 andomly selected stores (Sample A) and to lower the price in 10 andomly selected stores (Sample B). Monthly revenue (number sales x ales price) from these toasters was recorded for each of the 30 stores. Results from the two samples are as follows: No. of stores Mean Std. Dev. Sample A Sample B $842 $817 $217 $202 20 10 a) If you considered these to be independent samples, what would be the pooled estimate of the standard deviation for revenue? (q the two means. Calculate a 95% confidence interval for the difference between

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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To investigate the effect of price on toaster sales, a chain of department stores decided to raise the price of a certain brand of toaster in 20 randomly selected stores (Sample A) and to lower the price in 10 randomly selected stores (Sample B). Monthly revenue (number sales x sales price) from these toasters was recorded for each of the 30 stores. Results from the two samples are as follows: No. of stores Мean Std. Dev. Sample A Sample B $842 $817 $217 $202 20 10 If you considered these to be independent samples, what would be the pooled estimate of the standard deviation for revenue? Calculate a 95% confidence interval for the difference between (а) (b) the two means.
Transcribed Image Text:To investigate the effect of price on toaster sales, a chain of department stores decided to raise the price of a certain brand of toaster in 20 randomly selected stores (Sample A) and to lower the price in 10 randomly selected stores (Sample B). Monthly revenue (number sales x sales price) from these toasters was recorded for each of the 30 stores. Results from the two samples are as follows: No. of stores Мean Std. Dev. Sample A Sample B $842 $817 $217 $202 20 10 If you considered these to be independent samples, what would be the pooled estimate of the standard deviation for revenue? Calculate a 95% confidence interval for the difference between (а) (b) the two means.
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