Hi, 

a recent poll of 1304 people concluded that 34% of American car owners do not

 know how to replace a flat tire with the spare

Find the margin of error and the 95% confidence interval.

ME = 1.96=.026

95% confidence interval is .314 to .426  0r 31.4% to 42.6%

________________________________________________________________________________



	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 <-2.33	           z >+2.33

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

 

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