document.write( "Question 628484: How many people would need to be surveyed on health care to estimate the mean of an entire population to within 2 units if the standard deviation was 12 and we wanted a 92% confidence level?\r
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Algebra.Com's Answer #395716 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi, Re TY, Yes!  Good work! Two-tailed. 
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document.write( "How many people would need to be surveyed on health care to estimate the mean of an entire population to within 2 units 
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document.write( "if the standard deviation was 12 and we wanted a 92% confidence level?
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document.write( "92% confidence level ⇒ z = 
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document.write( "ME =  
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document.write( "        a	a/2	crtical regions
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document.write( "80%	0.2	10%	z <-1.28155	z >+1.28155
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document.write( "90%	0.1	5%	z <-1.645	          z >+1.645
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document.write( "92%	0.8	4%	z <-1.751	          z >+1.751
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document.write( "95%	0.05	2.50%	z <-1.96	          z >+1.96
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document.write( "98%	0.02	1%	z <-2.326	          z >+2.326
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document.write( "99%	0.01	0.50%	z<-2.576	          z >+2.576
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