Question

In a study of the accuracy of fast food drive-through orders, Restaurant A had 304 accurate orders and

72 that were not accurate. **a.** Construct a 90%
confidence interval estimate of the percentage of orders that are
not accurate. **b.** Compare the results from part
(a) to this

90% confidence interval for the percentage of orders that are not accurate at Restaurant B: 0.1730.173less than<pless than<0.2470.247. What do you conclude?

Express the percentages in decimal form.

Answer #1

**Solution:-**

**a) 90% confidence interval estimate of the percentage
of orders that are not accurate is (0.1581,0.2249).**

x = 72, n = 304

b)

90% confidence interval estimate of the percentage of orders that are not accurate for restaurant A = (0.158,0.225)

90% confidence interval estimate of the percentage of orders that are not accurate for restaurant B = (0.173, 0.247)

**Both the intervals contains common values, hence we can
conclude that there is no difference in the percentage
of orders that are not accurate for restaurants A and restaurant
B.**

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