2. A researcher observed children with and without ADHD as they are playing with

Question

2. A researcher observed children with and without ADHD as they are playing with a jigsaw puzzle. The following table reports the amount of time (in minutes) that each child engaged with the puzzle: TIME WITH PUZZLE(MIN)

1) The difference between these two groups of children is about 5 minutes and the standard deviation is 3.7 minutes. How many children would the researcher need in each group to reach a statistically significant difference? (Hint: use the power equation)

2) Did the researcher observe enough children in each of these groups? Yes No

3) The difference between these two groups of children is about 5 minutes. What does the difference reflect: Between-group variability Within-group variability

4) The time that children without ADHD interacted with the puzzle ranged between 11-18 min. What does this range in responses reflect? Between-group variability Within-group variability

Explanation / Answer

1) 7 more children in each group

2) no

3) between group variability

4) within group variability

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