Refer to Table 9.3.

a. For the linear-by-linear association model, construct a 95% confidence interval for the odds ratio using the four corner cells. Interpret.

b. Fit the column effects model. Compare estimated column scores to the equal-interval scores in part (a). Test that the true column scores are equal-interval, given that the model holds. Interpret. Construct a 95% confidence interval for the odds ratio using the four corner cells. Compare to part (a).

Table 9.3:

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Opinions about Premarital Sex and Availability of Teenage Birth Control Teenage Birth Control“ Strongly Disagree Strongly Agree Premarital Sex Disagree Agree Always wrong 81 68 60 38 (42.4)' 7.62 (80.9)3 (51.2) (86.4) - 4.1 (69.4) (67.0) 3.1 -4.8 (67.6) (29.1) Almost always wrong 24 26 29 14 (16.0) (19.3) (32.5) (25.2) - 2.8 (17.6) 2.3 1.8 -0.8 (31.5) (20.8) (23.1) Wrong only sometimes 18 74 42 41 (61.2) (47.4) - 1.0 (48.8) (30.1) - 2.7 (24.4) (36.3) 1.0 2.2 (36.1) (65.7) Not wrong at all 36 57 157 161 (143.8) (70.6) - 6.1 (33.0) (85.2) (111.4) - 4.6 2.4 6.8 (65.1) (157.4) (155.5) al 'Independence model fit; standardized Pearson residuals for the independence model fit; *linear-by-linear association model fit.