In Exercises 6.65-6.68, a. use Table III in Appendix A to construct a normal pro
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Question
In Exercises 6.65-6.68, a. use Table III in Appendix A to construct a normal probability plot of the given data. For simplicity, treat equal observations as being slightly different when obtaining normal scores. b. use part (a) to identify any outliers. c. use part (a) to assess the normality of the variable under con sideration. 6.66 Cell Phone Rates. In the February 2003 issue of Con- Summer Reports, different cell phone providers and plans were compared. The monthly fees, in dollars, for a sample of the providers and plans are shown in the following table. 40 110 90 30 70 70 30 60 60 50 60 70 35 80 75Explanation / Answer
Here the variable is monthly fees, in dollars. . To construct a normal probability plot, we first arrange the data in increasing order and obtain the normal scores from Table III. Since there are 15 observations, we will use the normal scores from the n = 15 column of Table III.
In the table below, the ordered data are shown in the first column and the normal scores are shown in the second column. Now, create a normal probability plot.