Recent research suggests that depression significantly increases the risk of developing dementia later inlife (bbc news, july 6, 2010). in a study involving 949 elderly persons, it was reported that 22% of thosewho had depression went on to develop dementia, compared to only 17% of those who did not havedepression. a. choose the relevant population and the sample. (you may select more than one answer.) 1. the sample consists of 949 elderly people.2. the population is all elderly people.3. the population is all younger people.4. the sample consists of 949 younger peopleb. do the numbers 22% and 17% represent the population parameters or sample statistics?

a.

Option 1

Option 2

b. Sample statistics

Step-by-step explanation:

a.

The set that includes the list of all possible individual in the interested area of study is termed as population while the portion or a part of population is termed as sample. The given scenario indicates that population is all elderly people from which 949 elderly people are selected for study and so, 949 elderly people are included in sample. So, option 1 and option 2 are correct for indicated scenario.

b.

The percentages 22% and 17% are calculated from 949 elderly people that are indicated as sample. Hence, the percentages 22% and 17% are the measure of sample and so, they represents sample statistics.

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.