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Statistics / Applied Statistics and Probability for Engineers 6 / Chapter 8.2 / Problem 44E

Applied Statistics and Probability for Engineers | 6th Edition | ISBN: 9781118539712 | Authors: Douglas C. Montgomery, George C. Runger

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Using the data from Exercise 8-22 on adhesion without

Chapter 8, Problem 44E

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QUESTION:

Using the data from Exercise 8-22 on adhesion without assuming that the standard deviation is known,

(a) Check the assumption of normality by using a normal probability plot.

(b) Find a 95% confidence interval for the mean adhesion.

Questions & Answers

QUESTION:

Using the data from Exercise 8-22 on adhesion without assuming that the standard deviation is known,

(a) Check the assumption of normality by using a normal probability plot.

(b) Find a 95% confidence interval for the mean adhesion.

ANSWER:

Step 1 of 4

(a)

The data from Exercise 8-22 on adhesion: 2.69, 5.76, 2.67, 1.62 and 4.12

To check whether the five readings on adhesion are normally distributed. We need to construct a normal probability plot. If the points in the probability plot form a line or lie closer to the line drawn approximately between the 25th and 75th percentile points, then we can say that the data is normally distributed.

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