Recall Exercise 6.2.31 about memorizing words by a group that was listening to music compared to a group that was not listening to music.

a. Put the data in the Multiple Means applet to create a null distribution and from it calculate a 2SD confidence interval for the difference in the number of words memorized between the two groups. 

b. Explain what your interval from part (a) means in context. 

c. Based on your interval, is there strong evidence of a difference in the mean number of words memorized between the two groups?

Data from Exercise 31

Student researchers tested to see whether listening to music would interfere with a person’s ability to memorize words. Their subjects were randomly assigned to either listen to music or not. They were then shown 40 five-letter words for 90 seconds. The words were taken away and they were asked to write down as many words as they could remember. Their results can be found in the file WordsMemorized. Does listening to music tend to hinder people’s abilities to memorize words?