In the new box, move the cursor to fill in the X and Y ranges in the two
rows markedArray 1andArray 2. The computer will return with numer-
ical value for the statistic requested, Pearson’s correlation coe‰cientr,ina
preselectedcell.EXERCISES
2.1 Table E2.1 gives the values of serum cholesterol levels for 1067 U.S. men
aged 25 to 34 years.TABLE E2.1
Cholesterol Level
(mg/100 mL) Number of Men
80–119 13
120–159 150
160–199 442
200–239 299
240–279 115
280–319 34
320–399 14
Total 1067(a)Plot the histogram, frequency polygon, and cumulative frequency
graph.
(b)Find, approximately, the median using your cumulative frequency
graph.
2.2 Table E2.2 provides the relative frequencies of blood lead concentrations
for two groups of workers in Canada, one examined in 1979 and the
other in 1987.TABLE E2.2
Relative Frequency (%)
Blood Lead
(mg/dL) 1979 1987
0–19 11.5 37.8
20–29 12.1 14.7
30–39 13.9 13.1
40–49 15.4 15.3
50–59 16.5 10.5
60–69 12.8 6.8
70–79 8.4 1.4
80 þ 9.4 0.492 DESCRIPTIVE METHODS FOR CONTINUOUS DATA