Question: 5.4 For the leukemia survival data in Exercise 4.2: a. Use the Wald statistic to obtain an approximate 95% confidence interval for the parameter 1.

5.4 For the leukemia survival data in Exercise 4.2:

a. Use the Wald statistic to obtain an approximate 95% confidence interval for the parameter β1.

b. By comparing the deviances for two appropriate models, test the null hypothesis β2 = 0 against the alternative hypothesis β2 =6 0. What can you conclude about the use of the initial white blood cell count as a predictor of survival time?

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