Example 10.S.1 referred to a sample of HIV-infected women who gave birth to two children. One of the outcomes that was studied was whether the gestational age of the child was less than 38 weeks; this information was recorded for 106 of the families. The data lor this variable are shown in the table below. Consider using McNemar's test with a non directional alternative.

(a) State the null hypothesis in context.
(b) What is the value of the test statistic?
(c) The P-value for the test is 0.0017. If α = 0.10, what is your conclusion regarding the hypotheses in (ii)?
Exercise 10.S.1

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Younger sibling38 weeks? No Older sibling < 38 weeks? Yes No Yes 26 21 54 Group Intervention Control CHD? Yes No 1,549 2.549 27745 46.286 Total19,54129.294 48,835 1,000 18,541