Quiz 4.2a 





Type of relationship 
Positivenegative 


A. 
linear 
positive 


B. 
linear 
negative 


C. 
nonlinear 



D. 
nonlinear 



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 yintercept 



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? 


