Among elementary school children, the correlation between ...

[Melani1276]

Among elementary school children, the correlation between strength and
  weight is .60, and the correlation between strength and age is .70. The
  correlation between weight and age is .80. (All correlations are
  significant).
 
  What is the partial correlation between strength and weight,
  holding age constant?
 
 
 What will be an ideal response?

Question 2

A powerful test is one that is
 
  a. less likely to commit the Type 2 error
  b. more likely to commit the Type 2 error
  c. more likely to accept the null hypothesis
  d. less likely to detect a population difference

[joewallace]

Answer to Question 1

Partial r = .093

Answer to Question 2

a

[Melani1276]

Wow, this really help

[ryansturges]

Gracias!