Quiz 4.2a




Type of relationship Positive|negative

A. linear positive

B. linear negative

C. non-linear

D. non-linear

E. random

F. linear negative

Averages Su 02 (x) MS 150 (y)


63 79


77 62


78 62


83 56


72 60


89 41












-1.2836 1. Calculate the slope


158.84 2. Calculate the y-intercept


negative 3. Positive or negative?


71.55 4. x=68


86.35 5. y=48


-0.9423 6. Determine r.


strong/high 7. Level of corr


linear 8. Linear?


0.8878 9. Coefficient of determination.


88.78% 10. What % in the variation...



11. Inference? #2


[probably not] 12. In this case, is there causation?


[variable] 13. Why or why not?


















Observation: Those who once did



well, are now not doing well.



Those who once did poorly, are now



doing well. Food for thought?