# Question: In the article Comparison of Fiber Counting by TV Screen

In the article "Comparison of Fiber Counting by TV Screen and Eyepieces of Phase Contrast Microscopy" (American Industrial Hygiene Association Journal, Vol. 63, pp. 756-761), I. Moa et al. reported on determining fiber density by two different methods. Twenty samples of varying fiber density were each counted by 10 viewers by means of an eyepiece method and a television-screen method to determine the relationship between the counts done by each method.

The results, in fibers per square millimeter, are presented on the WeissStats CD.

a. Decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate. If so, then also do parts (b) and (c).

b. Obtain the linear correlation coefficient.

c. Interpret the value of r in terms of the linear relationship between the two variables in question.

The results, in fibers per square millimeter, are presented on the WeissStats CD.

a. Decide whether use of the linear correlation coefficient as a descriptive measure for the data is appropriate. If so, then also do parts (b) and (c).

b. Obtain the linear correlation coefficient.

c. Interpret the value of r in terms of the linear relationship between the two variables in question.

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