Question
In: Statistics and Probability
4. A statistical researcher wishes to investigate the relationship between a student’s study time and their...
4. A statistical researcher wishes to investigate the relationship between a student’s study time and their ultimate exam grade 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=40 Ex2=354 and Exy=670
Ey=80 Ey2=1346
- Sketch the scatter diagram. Does the trend appear to be positive or negative?
- given that E(x-xbar)2=34, Please use that comment to help determine the sample standard deviation for the X data.
- Given that [n*Ey2-(Ey)2]=330, Please use that comment to help determine the sample standard deviation for the Y data. explain
- Please determine the regression equation “y=a+bx” for these data. explain
- Please use your Part D regression equation to predict the exam grade for the sixth student who happened to take 10 hours to study for the exam. explain
- please determine the sample linear correlation coefficient for this data. explain
Solutions
orchestra answered 1 year agoRelated Solutions
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