Updates Not Instal Some updates couid /4 Week 9c Chapter 22 Inference About a Pr

Question

Updates Not Instal Some updates couid /4 Week 9c Chapter 22 Inference About a Proportion: Problem Previous Problem List Next (1 point) 2 5758 An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided bythe local dealer The customer relations department wen survey a rancom sample of customers and crpute a 99% confidence interval for the proportion who are not satistied ) Past studies suggest that this proportion will be about 0.2 Find the sample size needed if the margin of the emor of the confidence interval is to be about 0.025. (You will need a critical value accurate to at least 4 decimal places.) Sampie sze aly contand, 21% of the strpe say rwy r" not satndet, what using sample sze above, when te sample is s the margin of the emor of the confidence interval? Note: You can ean partial credit on this problem 2 3 5 8 9

Explanation / Answer

Solution:-
a) Sample size = (Z/E)^2*p*q = (2.576/0.025)^2*0.2*0.8

n = 1698.7586

n = 1699

b) MOE = 2.576*sqrt(0.21*0.79/1699) = 0.0255   

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