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Normal probability plot for the data

a. Draw a normal probability plot for the data set derived according to these instructions. SHOW ALL THE CALCULATIONS REQUIRED FOR THIS.

b. Assess whether this data set follows a normal distribution. If normality is not met by the data indicate what the problem is.

Data Set

1) 0.105

2) 0.162

3) 0.210

4) 0.235

5) 0.274

6) 0.314

7) 0.446

8) 0.527

9) 0.597

10) 0.673

11) 0.693

12) 0.916

13) 0.967

14) 1.049

15) 1.237

16) 1.272

17) 1.514

18) 1.660

19) 1.832

20) 2.207

21) 3.218

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## Q : Estimate for the mean concession total

A sample of 36 receipts at the theater concession stand has a mean total of $18.927 with a standard deviation of $3.883. Calculate the value of E, the margin of error you would use to find a confidence interval estimate for the mean concession tot