When testing the statistical significance of a correlation ...

[HCHenry]

When testing the statistical significance of a correlation coefficient, the null hypothesis states
 
  a. p = 0, the population correlation is zero.
  b. p = +1.00 or -1.00, the population correlation is +1.00 or -1.00.
  c. r = 0, the sample correlation is zero.
  d. r = +1.00 or -1.00 the sample correlation is +1.00 or -1.00.

Question 2

List five threats to the internal validity of an experimental design.
 
  What will be an ideal response?

[amandalm]

Answer to Question 1

A

Answer to Question 2

History, maturation, instrumentation, regression, and selection bias

[HCHenry]

Thanks for the timely response, appreciate it

[brbarasa]

Great answer, keep it coming