The mean waiting time at the drive-through of a fast-food restaurant from the time an order is placed to the time the order is received is

85.185.1

seconds. A manager devises a new drive-through system that

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believes will decrease wait time. As a test,

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initiates the new system at

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restaurant and measures the wait time for

1010

randomly selected orders. The wait times are provided in the accompanying table. The normal probability plot and boxplot for the sample are provided. Complete parts (a) and (b). 101.4 69.5 56.2 74.6 65.3 80.6 93.2 87.6 69.3 82.3

Correlation Coefficient Critical Values with Normal Probability Plots Correlation Coefficient Critical Values with Normal Probability Plots Sample Size, n Critical Value Sample Size, n Critical Value 5 0.880 16 0.941 G 0.888 17 0.944 T 0.898 18 0.946 3 0.906 19 0.949 g 0.912 20 0.951 10 0.918 21 0.952 11 0.923 22 0.954 12 0.928 23 0.956 13 0.932 24 0.957 14 0.935 25 0.959 15 0.939 30 0.960 Normal Probability Plot Normal Probability Plot of Waiting Time O 2 Normal Score 60 75 90 109 Time (sec)\f