12 May Part IV: Question 1a & 1b (Non-SPSS) Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For a sample of 20 subjects, M = 69.8 and s = 2.79. Use this information to answer the following: 1-a) Based on the data you have and the z table, what percentage of people might start to show signs of dementia at or before age 65? Answer 1-b) If you consider the normal range of onset in this population to be +/-1 z-score from the mean, what two ages correspond to this? Answer (+1 z) Work: Answer (-1 z) Work: Part IV: Question 2a-2b (Non-SPSS) For each of the following scenarios, compute the effect size and state whether it is approximately small, medium, or large. 2-a) Participants in an inpatient study of treatment for OCD complete an anxious feelings inventory which is then compared to the general population. The sample mean is M = 26.2. The mean in the general population of inpatients on this inventory is 35.1, and the population standard deviation is 1.5. Effect Size: Answer Work: Small/Med/Large: Answer 2-b) A mood assessment in a sample of 15 gym members has a mean of 83 and a standard deviation of 5.6. The mean in the general population on this measure is 79.5. Effect Size: Answer Work: Small/Med/Large:
c
Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75.
For a sample of 20 subjects, M = 69.8 and s = 2.79.
Use this information to answer the following:
1-a)
Based on the data you have and the z table, what percentage of people might start to show signs of dementia at or before age 65?
Answer
1-b)
If you consider the normal range of onset in this population to be +/-1 z-score from the mean, what two ages correspond to this?
Answer (+1 z)
Work:
Answer (-1 z)
Work:
Part IV: Question 2a-2b (Non-SPSS)
For each of the following scenarios, compute the effect size and state whether it is approximately small, medium, or large.
2-a)
Participants in an inpatient study of treatment for OCD complete an anxious feelings inventory which is then compared to the general population.
The sample mean is M = 26.2.
The mean in the general population of inpatients on this inventory is 35.1,
and the population standard deviation is 1.5.
Effect Size:
Answer
Work:
Small/Med/Large:
Answer
2-b)
A mood assessment in a sample of 15 gym members has a mean of 83 and a standard deviation of 5.6.
The mean in the general population on this measure is 79.5.
Effect Size:
Answer
Work:
Small/Med/Large:
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