We have referred several times to data on reaction times in a mental rotation task. These data can be found on this book’s website as Ex6–14.dat. Using SPSS, or a similar program, read in the data and plot a histogram of reaction times in seconds. Click on the appropriate box to superimpose a normal distribution on the graph. What does this suggest about the normality of these data and why might you not expect them to be normal?
Answer to relevant QuestionsIn Exercise 6.14, what score would be equal to or greater than 75% of the reaction times if this distribution were normal. What score actually has 75% of the observations below it? Suppose that we are collecting a large data set on emotional reactivity in adults. Assume that for most adults emotional reactivity is normally distributed with a mean of 100 and a standard deviation of 10. But for people ...A set of reading scores for fourth-grade children has a mean of 25 and a standard deviation of 5. A set of scores for ninth-grade children has a mean of 30 and a standard deviation of 10. Assume that the distributions are ...In Appendix D (or the Add.dat data set on the website), what is the probability that a person drawn at random will have an ADDSC score greater than 50? Now suppose that because of the high level of ticket sales, an additional $250 second prize will also be awarded. a) Given that you don’t win first prize, what is the probability that you will win second prize? (The ...
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