Use LazStats or MYSTAT to examine the means and standard deviations in Exercise 4.22. (For LazStats use Descriptive/Breakdown. For MYSTAT use the two-sample t test under the hypothesis testing menu and skip over the material that you don’t know.)
Answer to relevant QuestionsIf a student in Katz’s study simply responded at random (even without reading the questions), she would be expected to get 20 items correct. How does this compare to the measures we found in Section 4.5? Why should this ...Calculate the range, the variance, and the standard deviation for data that Katz et al. collected on SAT performance without reading the passage. The data follow: Instead of adding a score equal to the mean (as in Exercise 5.15), add a score of 40 to the data used in Exercise 5.1. How does this score affect the answers to 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 ...Assuming that the following data represent a population of X values with μ 5 4 and s 5 1.58: (a) Plot the distribution as given. (b) Convert the distribution in (a) to a distribution of X − μ. (c) Go the next step and ...
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