To conclude that smoking causes lung cancer, you need to ...

[MGLQZ]

To conclude that smoking causes lung cancer, you need to establish that
 
  a. there is a significant relation between smoking and lung cancer.
  b. lung cancer always follows smoking and does not appear before smoking.
  c. there are no other significant variables that influence both lung disease and cancer.
  d. All of these are true.

Question 2

To be useful in an analysis of covariance design, a covariate should have
 
  a. high positive correlation with the dependent variable.
  b. low positive correlation with the dependent variable.
  c. low negative correlation with the dependent variable.
  d. zero correlation with the dependent variable.
  e. high positive correlation with the main independent variable.

[huda]

Answer to Question 1

D

Answer to Question 2

A

[MGLQZ]

Gracias!

[hollysheppard095]

Excellent