Waiting in Line In from Section 10.3, we considered the mean waiting time at the

Chapter 10, Problem 14

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Waiting in Line In from Section 10.3, we considered the mean waiting time at the drive-through of a fastfood restaurant. In addition to concern about the amount of time cars spend in the drive-through, the manager is also worried about the variability in wait-times. Prior to the new drive-through system, the standard deviation of wait-time was 18.0 seconds. Use the data in the table below to decide whether the evidence suggests the standard deviation wait-time is less than 18.0 seconds. In from Section 10.3, we verified the data could come from a population that is normally distributed. Use the a = 0.05 level of significance. 108.5 67.4 58.0 75.9 65.1 80.4 95.5 86.3 70.9 72.0 suggest the machine may be out of control, that is, have too muchvariability? In from Section 10.3, we verified the datacould come from a population that is normally distributed. Use thea = 0.05 level of significance.64.05 64.05 64.03 63.97 63.95 64.0264.01 63.99 64.00 64.01 64.06 63.9463.98 64.05 63.95 64.01 64.08 64.0163.95 63.97 64.10 63.98