Head cold reaction times - Reaction time tests assess a person's quickness to react to a stimulus. These tests measure how quickly a person can click a mouse button or tap on a screen when a dot appears on a screen. Pharmaceutical researchers are investigating the side effects of a new cold medication. They decide to use a reaction time test that is known to have results that are normally distributed with a mean score of 196. They recruit a random sample of 15 healthy adults who are given a dose of the cold medication. One hour later, the subjects each complete the reaction time test. The sample mean reaction time is calculated to be x = 225 with standard deviation s = 21.69. 1. State the hypotheses the researcher should use to test whether the mean reaction time is higher after a dose of the cold medication. Use correct notation. OA. Ho: x = 225 vs. HA: š + 225 ов. Но: и - 196 vs. Ha: и> 196 ос. Но: и %3D 196 vs. Hд: и < 196 OD. Ho: H = 196 vs. HA: µ 196 2. Calculate the test statistic. t 5.1783 3. Calculate the p-value. p-value = 0.00006 4. Calculate the effect size. d = 134

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