MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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In a study of the accuracy of fast food drive-through orders, Restaurant A had
238
accurate orders and
60
a. Construct a
90
%
confidence b. Compare the results from part (a) to this
90
%
confidence interval for the percentage of orders that are not accurate at Restaurant B:
0.187
less thanpless than0.255
.
What do you conclude?a. Construct a
90
%
confidence interval. Express the percentages in decimal form.nothing
less thanpless thannothing
b. Choose the correct answer below.
A.
No conclusion can be made because not enough information is given about the confidence interval for Restaurant B.
B.
The lower confidence limit of the interval for Restaurant B is higher than the lower confidence limit of the interval for Restaurant A and the upper confidence limit of the interval for Restaurant B is also higher than the upper confidence limit of the interval for Restaurant A. Therefore, Restaurant B has a significantly higher percentage of orders that are not accurate.
C.
Since the two confidence intervals overlap, neither restaurant appears to have a significantly different percentage of orders that are not accurate.
D.
Since the upper confidence limit of the interval for Restaurant B is higher than both the lower and upper confidence limits of the interval for Restaurant A, this indicates that Restaurant B has a significantly higher percentage of orders that are not accurate.
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