Question: (12 points) A psychologist is studying the concentration of a certain enzyme in saliva as a possible indicator of chronic: anxiety level. A. sample of 12 anxiety neurotics yields a mean enzyme concentration of 3.2 with s = 0.7. For comparison purposes, a sample of 20 subjects reporting low levels of anxiety is men-slued and yields a mean enzyme concentration of 2.3, with s = 0.4.

1. Perform a two-tailed t test with a 0.05 to determine whether the two populations sampled differ with respect to their mean saliva concentration of this enzyme.
2. Based on your answer to part (a), what type of error might, you he making?

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