By hand compute a 95 confidence interval for the proportion

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Reference no: EM13619455

On Tuesday, April 15th, 2014 Gallup reported that 43% of Americans approve of the job Barack Obama is doing as president. This proportion is based on phone surveys with approximately 1500 American adults.

By hand, compute a 95% confidence interval for the proportion of all American adults who approve of the job Barack Obama is doing as president. zc for a 95% confidence interval is 1.96.

By hand, compute and interpret a 99% confidence interval for the proportion of all American adults who approve of the job Barack Obama is doing as president. zc for a 99% confidence interval is 2.58.

What is happening to the range of the confidence intervals for presidential approval rating as the confidence level increases? Explain why this is happening.

Reference no: EM13619455

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