APFIVE Interpreting a Confidence Interval for Slope
A 90% confidence interval for the slope of a regression model relating study time (hours) to exam score (points) is (1.2, 3.8). A researcher wants to test the claim that for each additional hour of studying, exam scores increase by at least 2 points. What conclusion should be drawn?
A
There is insufficient evidence to support the claim
B
The claim is not supported since parts of the interval are below 2
C
The claim is refuted since the lower bound exceeds 0
D
No conclusion can be drawn without the p-value
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