In a study of the accuracy of fast food? drivethrough orders, Restaurant A had 225 225 accurate orders and 60 60 that were not accurate. a. Construct a 95 95?% confidence interval estimate of the percentage of orders that are not accurate. b. Compare the results from part? (a) to this 95 95?% confidence interval for the percentage of orders that are not accurate at Restaurant? B: 0.183 0.183 less than
Result:
In a study of the accuracy of fast food? drivethrough orders, Restaurant A had 225 accurate orders and 60 that were not accurate.
a. Construct a 95?% confidence interval estimate of the percentage of orders that are not accurate.
Proportion not accurate = 60/(60+225) =0.210526
Confidence Interval Estimate for the Proportion 

Data 

Sample Size 
285 
Number of Successes 
60 
Confidence Level 
95% 
Intermediate Calculations 

Sample Proportion 
0.210526316 
Z Value 
1.9600 
Standard Error of the Proportion 
0.0241 
Interval Half Width 
0.0473 
Confidence Interval 

Interval Lower Limit 
0.1632 
Interval Upper Limit 
0.2579 
95% CI for proportion= (0.1632, 0.2579)
95% CI for percentage= (16.32, 25.79)
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