Question

Given a two-tailed test, α = .05, N = 12 and H₀: ρ ≠ 0, which of these is the correct r_cv? (You should refer to a table of critical values of r for this question.)

A. ± .576

B. -.497

C. .576

D. ± .497

SS_X = 172.5, SS_Y = 80.6, and Σ[(X – M_X) (Y – M_Y)] = 95.33, r = :

A. -.81

B. 0

C. .08

D. .81

In a study of the relationship between the tempo of preferred music and daily mood, r² = 33.11 percent. Which of these is the most appropriate statement, given these findings?

A. The tempo of preferred music causes a 33 percent change in a person's daily mood

B. A person's daily mood explains 33 percent of the variability in the tempo of preferred music

C. The tempo of preferred music explains 33 percent of the variability in a person's daily mood

D. The tempo of preferred music has a moderate influence on a person's daily mood

Using the results r(128) = .34, p > .05, what is s_r?

A. .18

B. .08

C. .09

D. .01

Answer 1

Table of Critical Values: Pearson Correlation

1-tailed 0.05 0.025 0.005 2-tailed Degrees of Freedom = N-2 N 0.1 0.05 0.01 1 0.988 0.997 0.999 2 0.900 0.950 0.990 0.805 0.878 0.959 3 4 0.811 0.729 0.669 0.917 0.875 5 0.754 6 0.621 0.707 0.834 7 0.584 0.666 0.798 8 0.549 0.632 0.765 9 0.521 0.602 0.735 10 0.576 0.708 0.497 0.476 11 0.553 0.684 12 0.458 0.532 0.661 13 0.441 0.514 0.641 14 0.426 0.497 0.623 15 0.412 0.482 0.606 16 0.400 0.468 0.590 17 0.389 0.456 0.575

Note for N=12,and two tailed test, the correct r_cv at $\alpha$ =0.05 is ​​​​$\pm$0.576. (LOOK AT N=10,2 TAILED $\alpha$ =0.05)

A. IS CORRECT OPTION.

r=

E[lx-Mx) ( Y-MX)] = 95.33 * [(x-M-) (Y-Hy)] = 15:33 =) cou(X,Y) 95.33 12 SSX = 172.5 Х sty=8006 Ssx V(X) ssy July 172.5 --- 80.6 12 = 12 95.33 12 80.6 17205 12 12 0.81 그 0.8 0 8 48 D is correct option.

In a study of the relationship between the tempo of preferred music and daily mood, r2 = 33.11 percent. Which of these is the most appropriate statement, given these findings?

C is correct option.

Because r^2 is the proportion of variability in dependent variable (mood) attributable to independent variable(tempo of music)

Using the results r(128) = .34, p > .05, what is sr?