## In this blog you will find the correct answer of the Coursera quiz Quantitative Methods Coursera Week 5 Quiz mixsaver always try to brings best blogs and best coupon codes

### Sampling

1. In directed imagery tasks participants listen to a particular scenario and are instructed to picture the situation, the people, and the events as clearly and as vividly as they can. A researcher could ask participants how realistic they found such scenarios in order to check

• the external validity of the task
• whether the use of an experimental setting that does not mirror reality precisely was justified
• whether reactivity to the laboratory setting occurred

2. Strata are

• distinct subsets in the population defined by a stratification variable
• all the elements in a population that can be individually identified
• all the elements in a sampling frame

3. Opinion polls attempt to measure public opinion. Poll results can accurately reflect the attitudes in the population if

• the sample is large enough and based on self-selection
• the poll is based on probability sampling
• the sample is large enough and consists of volunteer respondents

4. Systematic sampling may be used instead of simple random sampling if

• the sample size is large
• we are unaware of a pattern in the list of elements
• the list of elements is ordered randomly

5. The loss in precision is usually far outweighed by the reduced cost. This applies to

• stratified sampling
• random sampling
• cluster sampling

6. A researcher approaches the first visitor entering a mall and asks if he or she is willing to participate in a study on aging and depression. He approaches the next visitor, followed by the next, and so on. This is

• convenience sampling
• quota sampling
• purposive sampling

7. As the size of a random sample increases, the amount of sampling error

• remains the same
• decreases
• increases

8. Using the same sample frame, a random sample of 500 voters were interviewed by telephone and a second random sample of 500 voters answered the same set of questions by filling out a web survey. A systematic difference in polls results can be due to

• an incomplete or inaccurate sampling frame
• differences in non-sampling error between the two samples
• the amount of sampling error between the two samples

9. To decide the optimal sample size, one needs to consider

• the variability in the population
• the variability in the population and the margin of error that one is willing to accept
• the size of the population

### Peer-graded Assignment: Sampling – Writing assignment (Evaluative)

Project Title *
Give your project a descriptive title

 Sampling – Writing assignment (Evaluative)