Question

Julie found an r value to be -.56; Jill found an r value to be .58. who had the stronger value ?

1. Julie    b. Jill     c. they are both the same in strength

d. none of these

If an r squared   = .529, find the coefficient of non-determination.

Suppose you calculated a corrleation value of .06 with critical value(s) = +/- 0.444, should you contnue on to regression ? Yes-no

Why or why not ?

1. since there is a significant correlation, continue on to regression

b. since there is no significant correlation, continue on to regression

c. since there is a significant correlation, DO NOT continue on to regression

4. since there is NO significant correlation, DO NOT continue on to regression

Answer 1

(1)

Correct option:

b.    Jill

Explanation:
Since absolute value of Jill's r = 0.58 is greater than absolute value of Julie's r = 0.56, Jill had the stronger value.

(2)

Given :

R² = 0.529

So

The Coefficient of Non-determination = 1 - 0.529 = 0.471

(3)

H0: Null Hypothesis: = 0 (Population correlation is 0)

HA: Alternative Hypothesis: 0 (Population correlation is not 0)

Since calculated value of r = 0.06 isless than critical value of r = 0.444, the difference is not significant. Fail to reject null hypothesis. Conclusion: (Population correlation is 0. So, we should not continue on regression.

So,

Correct option:

no

(4)

Correct option:

d.     Since there is NO significant correlation, DO NOT continue on to regression.