The Data Fluency Inventory - Data Fluency: Empowering Your Organization with Effective Data Communication - page 221

6. For the previous scores, what is the interquartile range ?
a. 8
b. 7
c. 5
d. 9
e. The interquartile range cannot be calculated with this data.
Answer: a. 8
The interquartile range measures the spread of the center half of the
dataset, or Q3 - Q1.
14 - 6 = 8
7. A line chart of a student's test score performance would be an appropriate
way to display which of the following?
a. The student's average test score
b. The student's overall grade
c. The student's growth over time
d. The student's abilities
e. You shouldn't use line charts for individual students.
Answer: c. Line graphs are best used to model growth or change over time.
8. To examine the relationship between student free/reduced lunch status
and student test scores, you would most likely use which of the following?
a. A chi-square goodness of fit test
b. A one-way analysis of variance
c. A correlation coefficient
d. A Poisson probability distribution
Answer: c. Correlation coefficients measure both the strength and direction
of a relationship, in this case, the relationship between free/reduced
lunch status and test scores. The other statistical tests are appropriate for
modeling differences between groups of students.