b. Conduct the appropriate 5-step hypothesis test to determine if there is an association between observed improvement and sex, assuming a=0.05 . What do you conclude based on the test results? Show all calculations. [2 Marks] c. A colleague has questioned the results from the hypothesis test you conducted in question b. The concern that your colleague expressed is that small cell sizes may invalidate the test results. Do you agree? Explain. [1 Mark ] d. What is the p-value for the test you calculated in question a? Does this p-value support the conclusion you reached in question a? Explain . [1 Mark ] 6. You are a registered nurse working in a maternity ward and are interested in knowing if preterm infants with late metabolic acidosis and preterm infants without the condition differ with respect to urine levels of a certain chemical . The mean levels , standard deviations , and sample sizes studied are provided in the table below . Prior research suggests that the distribution of the chemical in urine is not normally distributed . Use these data to answer the questions below the table . Sample n With condition 8.5 5.5 Without condition 40 4.8 3.6 a . Assuming @=0.05 , what can you conclude regarding whether urine levels differ in the two groups ? Show all calculations . [2 Marks ] b. Calculate the 95% confidence interval for the mean difference in urine levels for the two populations . Show all calculations . [1 Mark ] 7. You are a registered nurse working in an eating disorders clinic, and you are interested in exploring whether various treatments for anorexia result in differences in weight before and after the treatments. You have collected before and after weights on clients in your clinic who underwent three treatments for anorexia. The data set for the study is in the Date folder in A2L Contents, is called Q7_ANOREX, and consists of the following variables: Treat (Cont = control treatment, CBT = cognitive behavioural therapy, FT = family-based treatment), Prewt (weight in kg before anorexia treatment), and Postwt (weight in ke after anorexia treatment). Use these data to answer the questions below. a. Conduct the appropriate statistical test to determine if there is a difference in the before treatment and after treatment weights for clients that received CBT . Assume 0=0.05 . Show all calculations . [2 Marks ] b . What is the p-value for the test you performed in question a above ? Does this p-value support the conclusion you reached in question a? Explain . [1 Mark ]