Scatter plot of phobia (X) versus statquiz (Y). From Looking at the plot, do you think the Pearson's r will be positive or negative? Large, Medium, or Small?

Appendix C . Data from Ihno's Experiment Exp_ Num_ 779 Coffee cups Phobia Prevmath Mathquiz Statquiz sqz Exp_ Hr_ Hr_ Gander Major Reason cond o- 00 - 0 o-00- N -NOOY NANN - N base pre Hr_ Anx_ Anx_ Anx_ -NNNNW NAWONG 69 post base pre 33 post 28 28 24 NN NN NN 38 41 39 CAN 19 11 11 14 sub num: arbitrary ID number for each participant. Key Gender: 1 = Female; 2 = Male. Gear: 1 = Psychology; 2 = Premed; 3 = Biology; 4 = Sociology; 5 = Economics. Mason: 1 = Program requirement; 2 = Personal interest; 3 = Advisor recommendation. Exp_cond: 1 = Easy; 2 = Mod Moderate; 3 = Difficult; 4 = Impossible. Coffee: 0 = not a regular coffee drinker; 1 = regularly drinks coffee. Num_cups = number of cups of s of coffee drunk prior to the experiment on the same day. Phobia: 0 = No phobia to 10 = Ex - Extreme phobia. prevmath = Number of math courses taken prior to statistics course. Mathquiz = Score on Math Background Quiz (a blank for this value indicates that a student did not take the quiz). Statquiz = Score on 10-question stats quiz given one week before the experiment. Exp sqz = Score on stats quiz given as part of the experiment (number correct, including the 1 1th question). HR base = Baseline heart rate (in beats per minute). HR pre = Prequiz heart rate. HR post = Postquiz heart rate. Anx base = Baseline anxiety score. Anx pre = Prequiz anxiety score. Anx post = Postquiz anxiety score.\f\f