Construct a normal probability plot for the following sample of observations on

Question

Construct a normal probability plot for the following sample of observations on coating thickness for low-viscosity paint.

Determine the z percentile associated with each sample observation. (Round your answers to two decimal places.)

Choose the plot that best represents the normal probability plot for the sample of observations.

Would you feel comfortable estimating population mean thickness using a method that assumed a normal population distribution?

Yes, the probability plot is reasonably straight. Yes, the probability plot is not straight.     No, the probability plot is reasonably straight. No, the probability plot is not straight.

You may need to use the appropriate table in the Appendix of Tables to answer this question.

0.81 0.86 0.90 1.04 1.07 1.11 1.28 1.32 1.49 1.50 1.59 1.60 1.66 1.72 1.78 1.84 thickness 1.8 1.6 1.4 1.2 1.0 0.8

Explanation / Answer

The plot at the bottom left is right.
Why?

- it should be a increasing function
- it should be QQ plot like, i.e. should stick to a straight line

On questions at the bottom -

Yes, i will be comfortable.
Yes, the probability plot is reasonably straight. Otherwise, in other charts there are outliers, pertaining to point which are distant from straight line.

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