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Class interval for wage classes

A survey was completed and the following two wage classes were used: ($4 - $7) and ($7 - $10). What is the class interval for these wage classes?

a. 2

b. 5

c. 4

d. 3

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## Q : Explain the correlation coefficient

Draw the scatterplot. Compute and explain the correlation coefficient. What percent of the variability is accounted for by the relationship between the two variable?