Some scenarios adapted from Gravetter, F.J. & Wallnau, L.B. (1996). Statistics for the behavioral sciences (4th ed.). St. Paul, MN: West Publishing.
5. Is the amount a person reads associated with the quality of their own writing? To test this, a researcher (using alpha 0.01) asks participants how many books they read per year, and has them write a 2-page paper (which she then has someone read and assign a grade of 0 to 10 to). Here is what she found:
Participant Books/yr Writing score A 18 6 B 24 7 C 12 5 D 5 3 E 10 4 F 32 7 G 19 5
Note: r = + 0.93 A. Test and why it’s used. B. Concluding paragraph with APA statistical report and explanation. C. Graph D. Questions.
1. What would you expect to happen to the correlation if you measured number of errors made in the writing sample rather than writing score? 2. If your finding above was significant, what do you have the option to now do?
