In a survey of 1,000 adults in a country, 722 said that they had eaten fast...

In a survey of 1,000 adults in a country, 722 said that they had eaten fast food at least once in the past month. Create a 95% confidence interval for the population proportion of adults who ate fast food at least once in the past month. Use Excel to create the confidence interval, rounding to four decimal places.

Expert Solution

In a survey of 1,000 adults in a country, 722 said that they had eaten fast food at least once in the past month. Create a 95% confidence interval for the population proportion of adults who ate fast food at least once in the past month. Use Excel to create the confidence interval, rounding to four decimal places.

95% confidence interval for the population proportion = (0.6942, 0.7498)

Confidence Interval Estimate for the Proportion

Data
Sample Size	1000
Number of Successes	722
Confidence Level	95%

Intermediate Calculations
Sample Proportion	0.722
Z Value	-1.9600
Standard Error of the Proportion	0.0142
Interval Half Width	0.0278

Confidence Interval
Interval Lower Limit	0.6942
Interval Upper Limit	0.7498

Confidence Interval Estimate for the Proportion

Data
Sample Size	1000
Number of Successes	722
Confidence Level	0.95

Intermediate Calculations
Sample Proportion	=B5/B4
Z Value	=NORM.S.INV((1-B6)/2)
Standard Error of the Proportion	=SQRT(B9*(1-B9)/B4)
Interval Half Width	=ABS(B10*B11)

Confidence Interval
Interval Lower Limit	=B9-B12
Interval Upper Limit	=B9+B12

orchestra answered 1 year ago

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