1. A study is made to see if increasing the substrate concentration has an appreciable effect on the velocity of a chemical reaction. With a substrate concentration # 1, the reaction was run 15 times with an average velocity of 7. 5 micromoles per minutes and a standard deviation of 1. 5 with a substrate concentration #2, 12 runs were made, yielding an average velocity of 8. 8 micromoles per minutes and a sample standard deviation of 1. 2. Is there any reason to believe concentration #2 causes an increase in the mean velocity over concentration #1? use 0-0. 05 level of significance and assume the populations to be approximately normal distribution with equal variance. Instructions 1. Hypothesis.