SAEE SAEE - Data Collection and Analysis Questions and Answers 2 — Questions and Answers
Question 1: Which sampling method involves dividing a population into subgroups and then randomly selecting participants from each subgroup?
- Stratified sampling (Correct answer)
- Convenience sampling
- Snowball sampling
- Systematic sampling
Correct answer: Stratified sampling
Stratified sampling divides the population into homogeneous subgroups (strata) and randomly samples from each to ensure representation.
Question 2: A researcher notices that as study hours increase, test scores also increase. What type of correlation does this represent?
- Positive correlation (Correct answer)
- Negative correlation
- No correlation
- Inverse correlation
Correct answer: Positive correlation
A positive correlation occurs when both variables move in the same direction — as one increases, the other also increases.
Question 3: What is the primary purpose of using a control group in an experimental study?
- To provide a baseline for comparison against the treatment group (Correct answer)
- To increase the sample size of the study
- To eliminate the need for random assignment
- To ensure all participants receive the intervention
Correct answer: To provide a baseline for comparison against the treatment group
A control group serves as a baseline that does not receive the treatment, allowing researchers to measure the effect of the independent variable.
Question 4: Which measure of central tendency is most affected by extreme outliers in a data set?
- Mean (Correct answer)
- Median
- Mode
- Range
Correct answer: Mean
The mean is calculated using all values in the data set, so extreme outliers can significantly pull it higher or lower.
Question 5: In a double-blind study, who is unaware of which participants are in the control or experimental group?
- Both the researchers and the participants (Correct answer)
- Only the participants
- Only the researchers
- Neither the researchers nor the participants
Correct answer: Both the researchers and the participants
In a double-blind study, neither the researchers administering the treatment nor the participants know who is receiving the actual treatment versus the placebo.
Question 6: A survey question that leads respondents toward a particular answer is an example of what type of bias?
- Response bias (Correct answer)
- Selection bias
- Confirmation bias
- Publication bias
Correct answer: Response bias
Response bias occurs when the wording or structure of a question influences participants to answer in a particular way.
SAEE SAEE - Data Collection and Analysis Questions and Answers 2
Which sampling method involves dividing a population into subgroups and then randomly selecting participants from each subgroup?