Question

The data shown represent the cigarette tax (in cents) for 30 randomly selected states. Check for normality.

3 58 5 65 17 48 52 75 21 76 58 36 100

111 34 41 23 44 33 50 13 18 7 12 20 24 66 28 28 31

Answer 1

Let's use minitab:

First enter the given data values in minitab column.

Then click on Graph >>> Probability Plot... >>> Select first image " Single" >>> OK

Select graph variable as "select the column in which you enter the data value".

then click on OK so we get the following probability plot.

From the above graph p-value = 0.137

Which is greater than the desire level of significance = 0.05

Therefore the given data values are not follows normal distribution.