NeSA Data Analysis and Statistics

Question 1

A class recorded the following test scores: 70, 85, 90, 85, 75, 85, 60. What is the mode?

Accepted Answer

85

Answer

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?

Accepted Answer

Number of students or scores

Answer

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?

Accepted Answer

10

Answer

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?

Accepted Answer

25%

Answer

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)?

Accepted Answer

Mean

Answer

The mean is calculated using all values, so an outlier significantly changes the average, while the median and mode are less affected.

NeSA - Nebraska State Accountability Practice Test