Part IV: Question 1a & 1b (Non-SPSS)

·        Age at onset of dementia was determined in the general population to be m = 69.8 and s = 1.8.

·        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 67?

Answer

Work:

1-b)

What two ages correspond to +/-1 z-score from the mean (i.e. a z score of 1 and -1)?

Answer (+1 z)

Work:

Answer (-1 z)

Work: