Question

Question 46 1.6 points Save Anawer Dr. Jones oave students in her class a patest about statitical concepis. Ater teaching about hvpotheses tests, she then gave them a posttest about stascal concapes De Joees is inderastad in datarmieing thee is a reiationship between pretest and posttest scores, so she constructod the foilowing scaerpiet and cleulsted the comelation coefficient 120 100- 40 20 40 20 120 PRE soores ane moved from thee data set how woukd the comalon coefficent be afectea Lacate the pont that shows a prtost seors of 107 Tis point, wth orosents Jute's scones is actualy inconct Jah Sod

Answer 1

The point with the pretest score of 107 was record erroneously, hence it should be deleted. If we remove the point, we can see that if we draw an overall fit line on the remaining data points, the new line of best fit is a better fit to the data values than the best fit line with all the data points. Hence, we can say that the correlation coefficient will get stronger or increase & will lead to an overall stronger model.

Result: If we remove the point, the correlation coefficient increases