Suppose that we want to evaluate the role of intravenous pulse cyclophosphamide (IVCP) infusion in the management of nephritic syndrome in children with steroid resistance. Children were given a monthly infusion of IVCP in a dose of 500-750 mg/m2. The following data represent levels of serum albumin (g/dL) before and after IVCP in 14 randomly selected children with nephrotic syndrome.

Assuming that the samples come from a normal distribution:
(a) Here, we cannot assume that samples are independent. Assuming that the difference of each pair is approximately normal, test that the mean Pre-IVCP is less than the Post-IVCP at α = 0.05.
(b) Test for the equality of the variances at α = 0.05.

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Pre-IVCP 2.0 2.5 1.5 2.0 2.3 2.1 2.3 1.0 2.2 18 2.0 2.0 1.5 3.4 Post-IVCP 3.5 4.3 4.0 4.0 3.8 2.4 3.5 1.7 3.8 3.6 3.8 3.8 4.13.4