NeSA Data Analysis and Statistics 1 — Questions and Answers
Question 1: A class recorded the following test scores: 70, 85, 90, 85, 75, 85, 60. What is the mode?
- 85 (Correct answer)
- 75
- 80
- 70
Correct answer: 85
The mode is the value that appears most often; 85 appears three times, more than any other score.
Question 2: On a bar graph showing student test results, the x-axis represents subject names. What does the y-axis most likely represent?
- Student names
- Number of students or scores (Correct answer)
- Subject descriptions
- Dates of tests
Correct answer: Number of students or scores
In a bar graph with subjects on the x-axis, the y-axis typically shows the numerical value, such as number of students or test scores.
Question 3: What is the median of the data set: 4, 7, 10, 13, 19?
- 10 (Correct answer)
- 7
- 13
- 11
Correct answer: 10
The median is the middle value when data is ordered; in this set of 5 numbers, the middle (3rd) value is 10.
Question 4: A pie chart shows that 40% of students prefer math and 35% prefer reading. What percentage prefer other subjects?
- 15%
- 20%
- 25% (Correct answer)
- 30%
Correct answer: 25%
Since all percentages in a pie chart must total 100%, the remaining percentage is 100 − 40 − 35 = 25%.
Question 5: Which measure of central tendency is most affected by an extremely high or low value (outlier)?
- Mode
- Median
- Mean (Correct answer)
- Range
Correct answer: Mean
The mean is calculated using all values, so an outlier significantly changes the average, while the median and mode are less affected.
Question 6: A line graph shows temperature each month for a year. Which conclusion can best be drawn from a line graph?
- The most common temperature
- The total temperature for the year
- How temperature changes over time (Correct answer)
- The percentage of warm months
Correct answer: How temperature changes over time
Line graphs are best for showing trends and changes over time, making them ideal for tracking monthly temperature.
NeSA Data Analysis and Statistics 1
A class recorded the following test scores: 70, 85, 90, 85, 75, 85, 60.
What is the mode?