(a)To the right of 5.991 and of 9.210.
(b)To the right of 6.348.
(c)Between 5.991 and 9.210.3.23 For anFdistribution with two numerator df’s and 30 denominator df’s,
find the areas:
(a)To the right of 3.32 and of 5.39.
(b)To the right of 2.61.
(c)Between 3.32 and 5.39.
3.24 In a study of intraobserver variability in assessing cervical smears, 3325
slides were screened for the presence or absence of abnormal squamous
cells. Each slide was screened by a particular observer and then re-
screened six months later by the same observer. The results are shown in
Table E3.2. Calculate the kappa statistic representing the agreement
between the two screenings.
3.25 Ninety-eight heterosexual couples, at least one of whom was HIV-
infected, were enrolled in an HIV transmission study and interviewed
about sexual behavior. Table E3.25 provides a summary of condom use
reported by heterosexual partners. How strongly do the couples agree?
TABLE E3.25
Man
Woman Ever Never Total
Ever 45 6 51
Never 7 40 47
Total 52 46 98146 PROBABILITY AND PROBABILITY MODELS