Please use the following information to answer 6d-6e: In a study examining the effect of alcohol on reaction time, Liguori and Robinson (2001) found that even moderate alcohol consumption significantly slower response time to an emergency situation in a driving simulation. In a similar study, researchers measured reaction time 30 minutes after participants consumed one 6-ounce glass of wine. Again, they used a standardized driving simulation task for which the regular population averages µ = 400 msec. The distribution of reaction times is approximately normal with σ = 40. Assume that the researcher obtained a sample mean of x̅ = 422 for the n = 25 participants in the study. Are the data sufficient to conclude that the alcohol has a significant effect on reaction time? Use a two-tailed test with α = .01. 6d. Based on the calculated test statistic, would you reject the null hypothesis established in question 6a (MUST SHOW WORK FOR THIS PROBLEM)? Group of answer choices yes no 6e. Based on the previously conducted steps, we can conclude (MUST SHOW WORK FOR THIS PROBLEM): Group of answer choices a. The alcohol significantly decreased reaction time. b. The alcohol significantly increased reaction time. c. The alcohol had a significant effect on reaction time. d. The alcohol did not have a significant effect on reaction time.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Please use the following information to answer 6d-6e:

In a study examining the effect of alcohol on reaction time, Liguori and Robinson (2001) found that even moderate alcohol consumption significantly slower response time to an emergency situation in a driving simulation. In a similar study, researchers measured reaction time 30 minutes after participants consumed one 6-ounce glass of wine. Again, they used a standardized driving simulation task for which the regular population averages µ = 400 msec. The distribution of reaction times is approximately normal with σ = 40. Assume that the researcher obtained a sample mean of x̅ = 422 for the n = 25 participants in the study.

Are the data sufficient to conclude that the alcohol has a significant effect on reaction time? Use a two-tailed test with α = .01.

6d. Based on the calculated test statistic, would you reject the null hypothesis established in question 6a (MUST SHOW WORK FOR THIS PROBLEM)?

Group of answer choices

yes

6e. Based on the previously conducted steps, we can conclude (MUST SHOW WORK FOR THIS PROBLEM):

Group of answer choices

a. The alcohol significantly decreased reaction time.

b. The alcohol significantly increased reaction time.

c. The alcohol had a significant effect on reaction time.

d. The alcohol did not have a significant effect on reaction time.

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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