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A common assumption is that old age effects memory.To test this assumption, volunteer participants were randomly selected from different age groups, 25, 45, 65, and
A common assumption is that old age effects memory.To test this assumption, volunteer participants were randomly selected from different age groups, 25, 45, 65, and 85 and given a battery of memory tasks to complete.Memory scores were computed and are provided below.The scores below reflect the number of errors on the memory tasks.Thus, a high score reflects more memory difficulties and a low score reflects good memory task completion. Compute the appropriate test to determine if age has an impact on memory.
25 year olds | 45 year olds | 65 year olds | 85 year olds |
0 | 9 | 3 | 2 |
4 | 7 | 2 | 2 |
2 | 9 | 4 | 4 |
5 | 5 | 5 | 3 |
6 | 7 | 1 | 4 |
2 | 8 | 3 | 5 |
4 | 12 | 4 | 2 |
3 | 8 | 5 | 3 |
- What statistical test will you use and why?
- What is your computed answer?
- What probability level should you use and why?
- What is your degrees of freedom?
- Will you reject or fail to reject the null hypothesis? Why?
- What would be the best way to write if you were writing it for a journal article?
- What does your answer tell you about the relationship between age and memory performance? Be specific. If there are differences between groups, indicate how you know which differences are significant.
- If you made an error, was it Type I or Type II? Explain why.
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