A human factors psychologist studied three computer keyboard designs. Three samples of individuals were given material to type on a particular keyboard, and the number of errors committed by each participant was recorded. The data are as follows:
|
Keyboard A
|
Keyboard B
|
Keyboard C
|
|
0
|
6
|
6
|
|
4
|
8
|
5
|
|
0
|
5
|
9
|
|
1
|
4
|
4
|
|
0
|
2
|
6
|
Are these data sufficient to conclude that three are significant differences in typing performance among the three keyboard designs? Compute a one-way Analysis of variance (ANOVA) to address this research question using a 0.05 significance level.
1. What is your computed answer?
2. What would be the null hypothesis in this study?
3. What would be the alternate hypothesis?
4. What was the critical F value chosen?
5. Is there a significant difference between the groups?
6. Interpret your answer.