A researcher conducts a study to investigate the relationship between cigarette smoking
and illness. The number of cigarettes smoked daily, and the number of days absent from
work in the last year due to illness is determined for 12 individuals employed at the
company where the researcher works. The scores are given in the following table.
Subject 1 2 3 4 5 6 7 8 9 10 11 12
Cigarettes
Smoked 0 0 0 10 13 20 27 35 35 44 53 60
Days
Absent 1 3 8 10 4 14 5 6 12 16 10 16
a. Construct a scatter plot for these data. Does the relationship look linear?
b. Calculate the value of Pearson r.
c. Eliminate the data from subjects 1, 2, 3, 10, 11, and 12. This decreases the range of
both variables. Recalculate r for the remaining subjects. What effect does decrease
the range have on r?
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