Hi, 

A confidence interval estimate for the population mean is given to be (42.43, 51.02). 

(A) Determine the maximum error of the estimate, E. (51.02-42.43)/2 = 4.295

(B) Determine the confidence level used for the given confidence interval. 

standard deviation is 17.845 and the sample size is 47

 

         C = 1.649  OR ~90% confidence level



	a	a/2	crtical regions	

80%	0.2	10%	z <-1.28155	z >+1.28155

90%	0.1	5%	z <-1.645	          z >+1.645

92%	0.8	4%	z <-1.751	          z >+1.751

95%	0.05	2.50%	z <-1.96	          z >+1.96

98%	0.02	1%	z <-2.326	          z >+2.326

99%	0.01	0.50%	z<-2.576	          z >+2.576

 

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