NeSA Data Analysis and Statistics 2 — Questions and Answers
Question 1: A survey of 200 Nebraska students found that 50 students walk to school. What percentage walks to school?
- 20%
- 25% (Correct answer)
- 30%
- 15%
Correct answer: 25%
Percentage = (part / whole) × 100 = (50 / 200) × 100 = 25%.
Question 2: The range of a data set is 18. If the minimum value is 12, what is the maximum value?
- 24
- 28
- 30 (Correct answer)
- 36
Correct answer: 30
Range = maximum − minimum, so maximum = minimum + range = 12 + 18 = 30.
Question 3: Which graph would best display the comparison of science test scores among five different classes?
- Line graph
- Pie chart
- Bar graph (Correct answer)
- Scatter plot
Correct answer: Bar graph
A bar graph is best for comparing discrete categories (classes), using the height of bars to show differences in scores.
Question 4: A table shows quiz scores for 4 students: 88, 92, 76, and 84. What is the mean score?
- 84
- 85 (Correct answer)
- 86
- 87
Correct answer: 85
Mean = sum of values / number of values = (88+92+76+84) / 4 = 340 / 4 = 85.
Question 5: In a frequency table, what does the 'frequency' column represent?
- The total sum of all values
- The number of times each value occurs (Correct answer)
- The percentage each value represents
- The range between the highest and lowest values
Correct answer: The number of times each value occurs
The frequency column in a table shows how many times each value or category appears in the data set.
Question 6: If a stem-and-leaf plot shows stems of 6 and 7, with leaves 6|2,5,8 and 7|1,4, what is the largest value?
- 74 (Correct answer)
- 78
- 71
- 68
Correct answer: 74
The largest stem is 7 and the largest leaf attached to it is 4, making the largest value 74.
NeSA Data Analysis and Statistics 2
A survey of 200 Nebraska students found that 50 students walk to school.
What percentage walks to school?