Based on the data you have and the z table, what percentage of people might start to show

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:

Answer