Question

Jared wondered if the length of time spent studying for a math test actually affected the test scores, so he collected data from a randomly-selected group of middle school students after each grade level had a unit test. The data is shown in the scatterplot below.







Based on this data, which inference is valid?

Responses
A Time spent studying has no affect on a test score.Time spent studying has no affect on a test score.
B There is a positive correlation between study time and test scores.There is a positive correlation between study time and test scores.
C A student who studies 20 minutes will definitely pass the test.A student who studies 20 minutes will definitely pass the test.
D There is a negative relationship between study time and test scores.

Answer 1

B There is a positive correlation between study time and test scores.