Consider the following matched samples representing observations before and after an experiment. Assume that the sample differences are normally distributed.

a. Construct the competing hypotheses to determine if the experiment increases the magnitude of the observations.
b. Implement the test at a 5% significance level.
c. Do the results change if we implement the test at a 1% significancelevel?

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Before 2.5 1.8 1.42.9 1.21.93.1 2.5 After 2.9 3.1 3.91.8 0.2 0.6-2.5 2.9