Ch.5

Question 1

Data Collection

Answer 1

is the systematic gathering of information on targeted variables in an established pattern, which allows for precise and accurate answers to research questions. It’s a fundamental step in any research or investigation.

Question 2

survey

Answer 2

is simply a type of observational study where the subjects self-report their own behaviors, attitudes or conditions.

Question 3

Sampling

Answer 3

is the process of choosing a smaller group from a larger population for study. It’s used when it’s not practical to study everyone in the population.

Question 4

Simple Random Sample

Answer 4

a sample selected in such a way that every possible sample with the same number of observations likely to be chosen

Question 5

Stratified Random Sample

Answer 5

Obtained by separating the population into mutually exclusive sets, or strata, and thend rawing simple random samples from each stratum.

Question 6

Sampling error

Answer 6

difference between what a sample predicts and the true population parameter. Occurs because a sample is being used to make inferences about an entire population