1. A physics professor is disturbed to learn that many students apparently do not have a good understanding of facts related to motion. For instance, many do not understand that on a moving carousel the riders on the inside are traveling more slowly than those nearer the outside edge. The professor decides to examine whether passing a college-level physics class improves students' understanding of motion. Specifically, the professor compares two groups, one consisting of students who have passed an introductory physics course and the other consisting of students who have not taken such a course. (Note that this is a quasi-experimental design.) The professor measures knowledge of motion on a 50-point scale, with higher numbers indicating better knowledge of motion.

We will assume an alpha of 0.05.

This is run in the Fit Y by X function of JMP

Untitled 3 - JMP Pro X File Edit Tables Rows Cols DOE Analyze Graph Tools View Window Help Untitled 3 D Previously Scores Passed 45 Y 2 47 Y 3 41 Y 4 38 Y 5 46 Y 6 44 Y Columns (2/0) 7 42 Y Scores 8 42 Y I. Previou... Passed 9 40 N 10 38 N 11 36 N 12 35 N 13 38 N 14 42 N 15 45 N 16 31 N 17 35 N 18 47 N Rows All rows Selected Excluded OooOoo Hidden Labelled* Untitled 3 - Fit Y by X of Scores by Previously Passed - JMP Pro Oneway Analysis of Scores By Previously Passed 45 . . . . . 40 Scores . 35 30 N Y Previously Passed 4 t Test Y-N Assuming unequal variances Difference 4.42500 t Ratio 2.369271 Std Err Dif 1.86766 DF 15.03239 Upper CL Dif 8.40508 Prob > t 0.0316* Lower CL Dif 0.44492 Prob > t 0.0158* Confidence 0.95 Prob