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Ap Psychology Case Studies

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When we are carrying an experiment to find out differences between two groups, there will always be differences between them and most of these differences are due to things that are not even being manipulated. So, in this case Dr. Nefario randomly assigns each person that participated in the study to one of the two groups. One of the groups is a group that is allowed to sleep for 8 hours the night before the test and another group is a group that is allowed to sleep for 2 hours, so, in this case Dr. Nefario run a between subject experimental design. This random assignment is essential because it gives each condition to has an equal probability of being affected by participates’ differences. In this case, Dr. Nefario wants to see if the median response time is different between the two groups. Median is the middle score of set of data. We can find the median …show more content…
If we have an even number of scores, we have to take into account the two numbers that are in the middle and take the average scores. To use randomization test to determine if there is reliable difference in the median response time between the two groups, first, he has to collect the observed data, that is the participants’ response time from the two different groups (group that sleep for 8 hours and group that sleep for 2 hours). Then, we have to decide on the test statistic that we are going to use. Test statistic is an observed statistics that we are going to compare with the simulation of the null model. If we get the value of the test statistics that is very unlikely to happen under the null model, it means that the null model is probably wrong. In this case, Dr. Nefario wanted to use median

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