SAEE Data Collection and Analysis 2 — Questions and Answers
Question 1: Which sampling method gives every member of a population an equal chance of being selected?
- Convenience sampling
- Simple random sampling (Correct answer)
- Quota sampling
- Snowball sampling
Correct answer: Simple random sampling
Simple random sampling ensures each population member has an equal selection probability.
Question 2: A data set has values 4, 8, 8, 10, 20. What is the median?
- 8 (Correct answer)
- 10
- 12
- 20
Correct answer: 8
The median is the middle value when data is ordered, which is 8.
Question 3: Which graph type is best for showing the proportion of parts to a whole?
- Line graph
- Scatter plot
- Pie chart (Correct answer)
- Histogram
Correct answer: Pie chart
A pie chart displays each category as a slice of the total.
Question 4: What does a correlation coefficient of -0.9 indicate?
- Strong positive relationship
- No relationship
- Strong negative relationship (Correct answer)
- Weak negative relationship
Correct answer: Strong negative relationship
A value near -1 indicates a strong negative (inverse) linear relationship.
Question 5: Which measure of central tendency is most affected by an extreme outlier?
- Mean (Correct answer)
- Median
- Mode
- Range
Correct answer: Mean
The mean is pulled toward outliers because it uses every value.
Question 6: Primary data is best described as data that is:
- Collected from existing published sources
- Collected firsthand by the researcher (Correct answer)
- Always quantitative
- Never reliable
Correct answer: Collected firsthand by the researcher
Primary data is gathered directly by the researcher for the specific study.
Question 7: A histogram is most appropriate for displaying:
- Categorical brand names
- The frequency distribution of continuous data (Correct answer)
- A single percentage
- Geographic locations
Correct answer: The frequency distribution of continuous data
Histograms show how often values fall within continuous intervals.
SAEE Data Collection and Analysis 2
Which sampling method gives every member of a population an equal chance of being selected?