As part of the Katz et al. (1990) study that examined test performance on a passage that a group of students had not read, the experimenters obtained the same kind of data from a smaller group of students who had read the passage (called the Passage group). Their data follow:
Calculate the mode, median, and the mean for these data.
Answer to relevant QuestionsCreate a sample of ten numbers that has a mean of 8.6. Notice carefully how you did this—it will help you later to understand the concept of degrees of freedom. In Chapter 3 (Figure 3.5) we saw data on grades of students who did and did not attend class regularly. What are the mean and median scores of those two groups of students? (The data are reproduced here for convenience.) ...Given the following set of data, demonstrate that subtracting a constant (e.g., 5) from every score reduces all measures of central tendency by that amount. The mean of the data used in Exercise 5.1 is 46.57. Suppose that we had an additional subject who had a score of 46.57. Recalculate the variance for these data. (You can build on the intermediate steps used in Exercise 5.1.) ...Compare the mean, standard deviation, and variance for the data for the Cognitive Behavior condition in Exercise 5.21 with their 20% trimmed and Winsorized counterparts. Why is the Winsorized variance noticeably smaller than ...
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