1.13 The frequency distribution for the number of cases of pediatric AIDS
between 1983 and 1989 is shown in Table E1.13. Display the trend of
numbers of cases using a line graph.
TABLE E1.13
Year Number of Cases Year Number of Cases
1983 122 1987 1,412
1984 250 1988 2,811
1985 455 1989 3,098
1986 8481.14 A study was conducted to investigate the changes between 1973 and
1985 in women’s use of three preventive health services. The data were
obtained from the National Health Survey; women were divided into
subgroups according to age and race. The percentages of women receiv-
ing a breast exam within the past two years are given in Table E1.14.
Separately for each group, blacks and whites, display the proportions of
women receiving a breast exam within the past two years in a bar chart
so as to show the relationship between the examination rate and age.
Mark the midpoint of each age group on the horizontal axis and display
the same data using a line graph.
TABLE E1.14
Breast Exam within Past
2 Years
Age and Race 1973 1985
Total 65.5 69.6
Black 61.7 74.8
White 65.9 69.0
20–39 years 77.5 77.9
Black 77.0 83.9
White 77.6 77.0
40–59 years 62.1 66.0
Black 54.8 67.9
White 62.9 65.7
60–79 years 44.3 56.2
Black 39.1 64.5
White 44.7 55.41.15 Consider the data shown in Table E1.15. Calculate the sensitivity and
specificity of x-ray as a screening test for tuberculosis.
EXERCISES 39