Data Interpretation – Quiz 1

The National Center for Education Statistics, USA, did a study on public school teachers doing second jobs. Overall, 18% of teachers did second jobs earning an average of $5800. The graph below starts with that and then shows the percentage and salary for teachers of each category.

source: https://nces.ed.gov/pubs2021/2021007/index.asp

Percentage of teachers with a supplemental income from a second job

Average salary in Dollars of teachers with a supplemental income from a second job

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Question 1 of 3

1. Question

Question 1: The median of average salaries earned from second jobs will be_______

A. 5100

B. 5600

C. 5700

D. 6192

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Question 2 of 3

2. Question

Question 2: In the following year, the average salary from a second job for Elementary teacher increased by 10%. Which of the following statements is TRUE?

A. The mean will increase by much less than $470, exact value not known.

B. The median will increase though the extent of increase is not known.

C. The mean will remain unchanged.

D. The mean will change by 12% of 10% of $4700 = $56.40.

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Question 3 of 3

3. Question

Question 3: What can be concluded about the relationship between percentage of teachers doing second jobs and average salaries earned from them?

A. The higher the average salary from the second job, the greater is the percentage of teachers doing second jobs.

B. The lower the percentage of teachers doing second jobs, the higher is the average salary from the second job.

C. The more specialized a teacher’s field (e.g. health education), the more the average salary from the second job.

D. There is no meaningful correlation between percentage of teachers doing second jobs and average salaries earned from them.

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