ETS Statistical Analysis

Question 1

What is the mean of the data set: 4, 8, 6, 10, 2?

Accepted Answer

6

Answer

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?

Accepted Answer

Line graph

Answer

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?

Accepted Answer

8

Answer

Range = maximum value - minimum value = 9 - 1 = 8.

Question 4

What does a pie chart represent?

Accepted Answer

Parts of a whole as percentages

Answer

Pie charts display data as proportional slices of a circle, showing how individual parts contribute to the total.

Question 5

What is correlation?

Accepted Answer

A statistical relationship between two variables

Answer

Correlation measures the strength and direction of a relationship between two variables, without implying that one causes the other.

(ETS) Educational Testing Service Practice Test