A human factors psychologist is interested in how alcohol impacts driving performance. A sample of participants was randomly assigned into one of three different conditions of alcohol blood levels (abl). The participants then operate a driving simulator and each participant was measured on how much time (in seconds) they spent on a target when steering. The more time they spend on a target, the better their driving skills. What can the psychologist conclude with an α of 0.01? abl 1 abl 2 abl 3 221192171247234281238171 180146178134200170208156 180132172137154154176178 A) Obtain/compute the appropriate values to make a decision about H0.critical value = ; test statistic = Decision: B) Compute the corresponding effect size(s) and indicate magnitude(s).η2 = Magnitude= C) Conduct Tukey's Post Hoc Test for the following comparisons:2 vs. 3: difference = 1 vs. 3: difference = Conduct Scheffe's Post Hoc Test for the following comparisons:1 vs. 3: test statistic = 1 vs. 2: test statistic =
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
A human factors psychologist is interested in how alcohol impacts driving performance. A sample of participants was randomly assigned into one of three different conditions of alcohol blood levels (abl). The participants then operate a driving simulator and each participant was measured on how much time (in seconds) they spent on a target when steering. The more time they spend on a target, the better their driving skills. What can the psychologist conclude with an α of 0.01?
| abl 1 | abl 2 | abl 3 |
| 221 192 171 247 234 281 238 171 |
180 146 178 134 200 170 208 156 |
180 132 172 137 154 154 176 178 |
A) Obtain/compute the appropriate values to make a decision about H0.
critical value = ; test statistic =
Decision:
B) Compute the corresponding effect size(s) and indicate magnitude(s).
η2 =
Magnitude=
C) Conduct Tukey's Post Hoc Test for the following comparisons:
2 vs. 3: difference =
1 vs. 3: difference =
Conduct Scheffe's Post Hoc Test for the following comparisons:
1 vs. 3: test statistic =
1 vs. 2: test statistic =
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