Module 8 Lesson 2: Statistical Variability and Comparing Populations
The dot plots below show the test scores of seventh- and eighth-grade students:
Dot plot for Grade 7 shows 4 dots on score 60, 6 dots on score 70, 4 dots on score 80 and 6 dots on score 90. Dot plot for Grade 8 shows 5 dots on score 50, 7 dots on score 60, 4 dots on score 70, and 4 dots on score 80.
Based on visual inspection of the dot plots, which grade, if any, appears to have the higher mean score?
(1 point)
Group of answer choices
Grade 7
Grade 8
Both groups show about the same mean score.
No conclusion about mean score can be made from the data.