# Question

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 Questions

In 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 ...Post your question

0