2022-04-29
n a study of the accuracy of fast food drive-through orders, McDonald’s had 33 orders that were not accurate among 362 orders observed (based on data from QSR magazine). Construct a 95% confidence interval for the proportion of orders that are not accurate.
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Skilled2022-07-01Added 403 answers
The sample proportion here is computed as:
p = x/n = 33/362 = 0.0912
From standard normal tables, we have:
P(-1.96 < Z < 1.96) = 0.95
Therefore the confidence interval here is obtained as:
This is the required 95% confidence interval for the proportion of inaccurate orders.
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