Recent research suggests that depression significantly increases the risk of developing dementia later in life (BBC News, July 6, 2010). In a study involving 949 elderly persons, it was reported that 22% of those who had depression went on to develop dementia, compared to only 17% of those who did not have depression.

1.Choose the relevant population and the sample. (You may select more than one answer. Bold the answer(s) that are correct.)

a)The sample consists of all elderly people.

b)The sample consists of 949 elderly people.

c)The population is all younger and elderly people.

d)The population is all elderly people.

2. Do the numbers 22% and 17% represent the population parameters or the sample statistics? Bold the answer that is correct.

a)Population parameters

b)Sample Statistics

In this study population will be consists of all the elderly people residing in the area where study is conducted because sample is selected from population and sample is the selection of 949 elderly people.

The sample selected from population consists of 949 elderly people selected in the study.

2.

The given percentages represents sample statistics because they are computed from the selected sample.