Interpreting a Confidence Interval for Two Means
A study compared the mean daily screen time, in hours, of high school students from two school districts. A 99% confidence interval for the difference in the population mean daily screen times (District A − District B) is (−0.8, 0.3). Which statement provides the most accurate interpretation of this confidence interval?
We are 99% confident that students in District A spend between 0.8 hours less and 0.3 hours more on screens than students in District B.
We are 99% confident that the difference in mean daily screen time between the populations of students in District A and District B from which these samples were drawn is between -0.8 and 0.3 hours.
99% of the time, the difference in mean screen time between the two districts will be between -0.8 and 0.3 hours.
The difference in mean screen time between District A and District B is not statistically significant at the 1% level.
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