14. This is a continuation of Exercise 15 in Chapter 12. A case-control study in Berlin, reported by Kohlmeier et al. (1992) and by Hand et al. (1994), asked 239 lung cancer patients and 429 controls (matched to the cases by age and sex)

whether they had kept a pet bird during adulthood. Of the 239 lung cancer cases, 98 said yes. Of the 429 controls, 101 said yes. Compute the chi-square statistic and assess the statistical significance for the relationship between bird ownership and lung cancer.