7.38. A study12 used data from the Longitudinal Study of Aging to investigate how older people's health and social characteristics influence how far they 7.39. A study13 investigated the sexual orientation of adults who had been raised as children in lesbian families. Twcntj'-fivc children of lesbian mothers and a control group of 20 children of heterosexual mothers were seen at age 10 and again at age about 24. At the later time, they were interviewed about their sexual identity, with possible response Bisexual/Lesbian/Gay or Heterosexual. Table 7.22 shows results, in the form of a SAS printout for conducting Fisher's exact test.

(a) Why is Fisher's exact test used to compare the groups?

(b) Report and interpret the B-value for the alternative thatthe population proportion identifying as bisexual/lesbian/gay is higher for those with lesbian mothers.

TABLE 7.22 IDENTITY MOTHER | B/L/G I HETER0 I Total Lesbian I 2 I 1

23 I 25 Heterosx |

1 1

1 o 1+ — 1 1

1 20 I 20 Total 2 43 45 STATISTICS FOR TABLE OF MOTHER BY IDENTITY Statistic Prob Fisher's Exact Test (Left) 1.000

(Right) 0.303

(2-Tail) 0.495