Question

# In a study of the accuracy of fast food? drive-through orders, Restaurant A had 225 225...

In a study of the accuracy of fast food? drive-through 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? drive-through 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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