A researcher wanted to study the effect of alcohol on reaction time. She hypothe

Question

A researcher wanted to study the effect of alcohol on reaction time. She hypothesized that alcohol will INCREASE reaction time (participants will take longer to react) She selected a sample of n= 36 participants from Rutgers University The 36 participants each consumed a 6. ounce glass of wine. Thirty minutes later, the researcher measured each participant's reaction time, using a standardized driving simulation task for which the regular population has a u 400 msec reaction time with a ·48. The reaction time mean for the sample was M= 412 msec. Are the data sufficient to conclude that the alcohol significantly increased reaction time? 1. What is the appropriate hypothesis test? 2. What two means are you comparing in this test? 3. Please calculate the appropriate hypothesis test using all four steps Enter Step 1: Shift Step 2 Step 3

Explanation / Answer

1)
Ho: mu = 400
Ha: mu > 400

TS = (Xbar - mu)/(S/sqrt(n))
= (412 -400)/(48/sqrt(36))
= 1.5

at alpha = 0.05
critical value = 1.645

since TS < critical value
we fail to reject the null hypothesis

and we conclude that there is not sufficient evidence that
the alcohol increased reaction time

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