NBT Data Interpretation & Analysis

Question 1

What does a bar graph represent?

Accepted Answer

Data comparison across different categories.

Answer

A bar graph uses rectangular bars of varying heights or lengths to represent and compare data among different categories. Each bar corresponds to a specific category, and its length or height indicates the value or frequency for that category. This visual representation makes it easy to see differences and similarities between distinct groups of data.

Question 2

What is the median of the following data set: 1, 3, 3, 6, 7, 8, 9?

Accepted Answer

6.

Answer

The median is the middle value in a data set when the values are arranged in ascending or descending order. For the given ordered data set (1, 3, 3, 6, 7, 8, 9), there are 7 values. The middle value is the (7+1)/2 = 4th term. Counting from either end, the 4th term is 6, which is the median.

Question 3

What is the mode of the following data set: 1, 2, 3, 3, 4, 5, 6?

Accepted Answer

3.

Answer

The mode of a data set is the value that appears most frequently. In the given data set (1, 2, 3, 3, 4, 5, 6), the number 3 appears twice, which is more often than any other number. Therefore, 3 is the mode of this data set.

Question 4

How is the mean of a data set calculated?

Accepted Answer

Add all values and divide by the total number of values.

Answer

The mean, also known as the average, is calculated by summing all the individual values in a data set and then dividing that sum by the total count of values in the set. This method provides a central tendency measure that represents the typical value of the data.

Question 5

Which of the following graphs is best suited for showing trends over time?

Accepted Answer

Line graph.

Answer

A line graph is particularly effective for illustrating how data changes or trends over a continuous period, such as time. It connects data points with lines, making it easy to visualize increases, decreases, or stability in a variable over time. This makes it ideal for showing trends.

(NBT) National Benchmark Test Practice Test

(NBT) National Benchmark Test Practice Test

NBT Data Interpretation & Analysis