The following data were obtained from a repeated-measures research study.What is the value of SS for the difference scores? $$\begin{array} { l c c }
\text { Subject } & 1 \text { st } & 2 \text { nd } \
\hline \# 1 & 10 & 11 \
\# 2 & 4 & 6 \
\# 3 & 7 & 9 \
\# 4 & 6 & 5
\end{array}$$
A)10
B)6
C)4
D)1

Question

The following data were obtained from a repeated-measures research study.What is the value of SS for the difference scores? $$\begin{array} { l c c } 
\text { Subject } & 1 \text { st } & 2 \text { nd } \
\hline \# 1 & 10 & 11 \
\# 2 & 4 & 6 \
\# 3 & 7 & 9 \
\# 4 & 6 & 5
\end{array}$$
A)10
B)6
C)4
D)1

Quizplus · Accepted Answer

The difference scores are 1, 2, 2, -1. The mean of these scores is 1. The SS is calculated as the sum of squared deviations from the mean: (1-1)² + (2-1)² + (2-1)² + (-1-1)² = 0 + 1 + 1 + 4 = 6.

The Following Data Were Obtained from a Repeated-Measures Research Study