4. A statistical researcher wishes to investigate therelationship between a student’s study time and their ultimate examgrade for that exam. The following data is determined:
X=study time(hours) | 4 | 7 | 8 | 9 | 12 |
Y=exam grade (1 to 25 scale) | 11 | 16 | 14 | 22 | 17 |
Ex=40Â Â Â Â Ex2=354Â Â Â Â Â Â Â Â Â and Exy=670
Ey=80 Â Â Â Â Â Ey2=1346
- Sketch the scatter diagram. Does the trend appear to bepositive or negative?
- given that E(x-xbar)2=34, Please use that comment tohelp determine the sample standard deviation for the X data.
- Given that [n*Ey2-(Ey)2]=330, Please usethat comment to help determine the sample standard deviation forthe Y data. explain
- Please determine the regression equation “y=a+bx†for thesedata. explain
- Please use your Part D regression equation to predict the examgrade for the sixth student who happened to take 10 hours to studyfor the exam. explain
- please determine the sample linear correlation coefficient forthis data. explain
