A heating and air-conditioning company wants to estimate the number of emergency service calls they receive during

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A heating and air-conditioning company wants to estimate the number of emergency service calls they receive during the week and on weekends so as to decide how many technicians to have on call. A random sample of the number of heating and/or air-conditioning calls taken during a 15-week period is presented in Table 5.18.

a. Are there more emergency service calls on the weekends? Explain.

b. Should the company staff have more on-call technicians during the week or on the weekend?

Table 5.18

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