A Pearson correlation is computed for a sample of n = 18 pairs of ...

[ahriuashd]

A Pearson correlation is computed for a sample of n = 18 pairs of X and Y values. What correlations are statistically significant with  = .05, two tails?
 
  A) correlations between 0.468 and -0.468
  B) correlations greater than or equal to 0.468 and correlation less than or equal to -0.468
  C) correlations between 0.456 and -0.456
  D) correlations greater than or equal to 0.456 and correlation less than or equal to -0.456

Question 2

A random sample of n = 4 scores is obtained from a population with a mean of  = 80 and a standard deviation of  = 10. If the sample mean is M = 90, what is the z-score for the sample mean?
 
  A) z = 20.00
  B) z = 5.00
  C) z = 2.00
  D) z = 1.00

[zhanghao]

Answer to Question 1

B

Answer to Question 2

C

[ahriuashd]

Great answer, keep it coming

[xiaomengxian]

Thanks for the timely response, appreciate it