PowerPoint Certification Data Visualization 1 — Questions and Answers
Question 1: What is the mean of the data set: 4, 8, 6, 10, 2?
- 6 (Correct answer)
- 8
- 4
- 10
Correct answer: 6
Mean = sum of values / number of values = (4+8+6+10+2)/5 = 30/5 = 6.
Question 2: What type of graph is best for showing trends over time?
- Line graph (Correct answer)
- Pie chart
- Bar graph
- Scatter plot
Correct answer: Line graph
Line graphs connect data points over time, clearly showing trends, patterns, and changes in data.
Question 3: What is the range of the data set: 3, 7, 1, 9, 5?
- 8 (Correct answer)
- 5
- 7
- 9
Correct answer: 8
Range = maximum value - minimum value = 9 - 1 = 8.
Question 4: What does a pie chart represent?
- Parts of a whole as percentages (Correct answer)
- Changes over time
- Comparisons between groups
- Scatter patterns
Correct answer: Parts of a whole as percentages
Pie charts display data as proportional slices of a circle, showing how individual parts contribute to the total.
Question 5: What is correlation?
- A statistical relationship between two variables (Correct answer)
- Proof of cause and effect
- An average value
- A type of graph
Correct answer: A statistical relationship between two variables
Correlation measures the strength and direction of a relationship between two variables, without implying that one causes the other.
Question 6: What is the mode of: 2, 3, 3, 4, 5, 3, 6?
- 3 (Correct answer)
- 4
- 2
- 5
Correct answer: 3
The mode is the value that appears most frequently. The number 3 appears three times, more than any other value.
PowerPoint Certification Data Visualization 1
What is the mean of the data set: 4, 8, 6, 10, 2?