In order to evaluate the effects of stress on the development of stomach ulcers, three separate groups of monkeys were trained to avoid shock by performing a simple avoidance task, a complex avoidance task or a very complex avoidance task. The more complex the task, the less successful the monkeys were at avoiding electric shock. After several weeks of this, the number of stomach ulcers the monkeys had in each group were counted. Which statistical test should be used to compare ulcers across the three groups? Question 10Select one:
Question 10Select one:
Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment, (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment.
Which test should be used to assessing the effects of the treatment at these three time-points?
Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment.
| Subject | 0 weeks | 2 weeks | 4 weeks | Mparticipant |
| 1 | 28 | 45 | 69 | 47.33 |
| 2 | 32 | 43 | 72 | 49 |
| 3 | 30 | 47 | 65 | 47.33 |
| 4 | 29 | 45 | 75 | 49.67 |
| 5 | 31 | 44 | 70 | 48.33 |
| M | 30 | 44.8 | 70.2 | GM = 48.33 |
What is F critical? Round to 2 decimal places.
Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment.
| Subject | 0 weeks | 2 weeks | 4 weeks | Mparticipant |
| 1 | 28 | 45 | 69 | 47.33 |
| 2 | 32 | 43 | 72 | 49 |
| 3 | 30 | 47 | 65 | 47.33 |
| 4 | 29 | 45 | 75 | 49.67 |
| 5 | 31 | 44 | 70 | 48.33 |
| M | 30 | 44.8 | 70.2 | GM = 48.33 |
What is SS total? Round to 2 decimal places.
Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment.
| Subject | 0 weeks | 2 weeks | 4 weeks | Mparticipant |
| 1 | 28 | 45 | 69 | 47.33 |
| 2 | 32 | 43 | 72 | 49 |
| 3 | 30 | 47 | 65 | 47.33 |
| 4 | 29 | 45 | 75 | 49.67 |
| 5 | 31 | 44 | 70 | 48.33 |
| M | 30 | 44.8 | 70.2 | GM = 48.33 |
What is the SS between? Round to 2 decimal places.
Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment.
| Subject | 0 weeks | 2 weeks | 4 weeks | Mparticipant |
| 1 | 28 | 45 | 69 | 47.33 |
| 2 | 32 | 43 | 72 | 49 |
| 3 | 30 | 47 | 65 | 47.33 |
| 4 | 29 | 45 | 75 | 49.67 |
| 5 | 31 | 44 | 70 | 48.33 |
| M | 30 | 44.8 | 70.2 | GM = 48.33 |
What is the SS subjects? Round to 2 decimal places.
Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment.
| Subject | 0 weeks | 2 weeks | 4 weeks | Mparticipant |
| 1 | 28 | 45 | 69 | 47.33 |
| 2 | 32 | 43 | 72 | 49 |
| 3 | 30 | 47 | 65 | 47.33 |
| 4 | 29 | 45 | 75 | 49.67 |
| 5 | 31 | 44 | 70 | 48.33 |
| M | 30 | 44.8 | 70.2 | GM = 48.33 |
What is the SS within (i.e., SS error)? Round to 2 decimal places.
Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment.
| Subject | 0 weeks | 2 weeks | 4 weeks | Mparticipant |
| 1 | 28 | 45 | 69 | 47.33 |
| 2 | 32 | 43 | 72 | 49 |
| 3 | 30 | 47 | 65 | 47.33 |
| 4 | 29 | 45 | 75 | 49.67 |
| 5 | 31 | 44 | 70 | 48.33 |
| M | 30 | 44.8 | 70.2 | GM = 48.33 |
Match the respective degrees of freedom (df).
| df between | |
|
df subjects |
|
|
df within/error |
|
|
df total |
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