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The main waiting time at the drive-through of a fast food restaurant from the time in order is placed to the time the order is received is 87.1 seconds. A manager devices a new drive-through system that she believes would decrease weight time. As a test, she initiates a new system at her restaurant and measures the wait time for 10 randomly selected orders. The way times are provided in the table to the right. because the sample size is small, the manager must verify that the wait time is normally distributed, and the sample does not contain any outliers. The normal probability plot is shown below and the sample correlation coefficient is known to be R equals 0.990. Are the conditions for testing the hypothesis satisfied?
Sagot :
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