Distribution and Statistical Inference.

Using the attached document information in Table 8–A–1, use the chi-square test to determine if there is an association between age and sex for discharges from DRG 123. Calculate the phi coefficient. A) State the null and alternative hypotheses.

For the DRG 410, “Chemotherapy without Acute Leukemia as Secondary Diagnosis,” you want to determine if there is a difference in the length of stay by two payors, Managed Care and Medicare. The summary data appear in the attached document, Table 7- A.2 and Table 7-A.3.

a. State the null and alternative hypotheses and the alpha level.

b. Use the t test for two independent sample means to determine if the observed difference between the two means is statistically significant. What is the number of degrees of freedom, the resultant t statistic, and the significance level?

c. What are your conclusions?