Determine the margin of error for a confidence interval to estimate the population proportion for the following confidence levels with a sample proportion equal to 0.35 and n= 120
the margin of error for a confidence interval to estimate the population portion for 90% confidence level is
the margin of error for a confidence interval to estimate the population portion for 95% confidence level is
the margin of error for a confidence interval to estimate the population portion for 97% confidence level is
p = 0.35, n =120
1. Confidence interval =90%
At = 1-0.90 =0.10, critical value, zc=ABS(NORM.S,INV(0.10/2) )= 1.645
Margin of error, E =
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2. Confidence interval =95%
At = 1-0.95 =0.15, critical value, zc=ABS(NORM.S,INV(0.05/2) )= 1.96
Margin of error, E =
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3. Confidence interval =97%
At = 1-0.97 =0.03, critical value, zc=ABS(NORM.S,INV(0.03/2) )= 2.170
Margin of error, E =
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