Question 442749
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi
sample of the prescription cost in dollars for ZocorŪ, a drug used to lower cholesterol: 
110, 112, 115, 99, 100, 98, 104, 126
Find 95% confidence interval estimate of the population mean cost 
for a prescription of ZocorŪ? 
re sample data: (need to use calulator or exel 'data analysis' tool,etc)
mean = 108
SD = 9.6666
ME = {{{highlight(1.96)}}}[9.6666/sqrt(8)] = 6.6986			
CI: 108- 6.6986 < u < 108 +  6.6986

	a	a/2	crtical regions	
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 <-2.33	z >+2.33
99%	0.01	0.50%	z<-2.575	z >+2.575




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