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River Bottom Fire Department ( Prob . 8 - 2 2 ) deter - mined that they needed to adjust their data - gathering process

River Bottom Fire Department (Prob.8-22) deter- mined that they needed to adjust their data- gathering process for response time to eliminate bias. The times were expected to fall within 3.8 and 5.3 minutes. After doing so, they wanted to evalu- ate the process to determine whether or not it was under control. Thirty new samples were taken on 30 random days from 6 stations. These data can be found in the worksheet Prob. 8-25 in the C08Data.xlsx file on the Student Companion Site for this chapter. a. Compute the mean and range of each sample, calculate control limits, and plot them on x and R control charts. b. Does the process appear to be in statistical con- trol? Calculate descriptive statistics that may help you to determine the answer to this question. What evidence is there for your conclusion?

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