We are interested in how much marijuana affects quick decision-making reaction time such as while driving. 43 test subjects were each given a test of reaction skills while sober and also while under the influence of marijuana. Their Marijuana-Sober times were recorded and a 99% confidence interval was created: (1.3, 5.2) seconds.

The interpretation of this confidence interval is (select one):

1. We are 99% confident that the true sample mean difference in reaction times Marijuana - Sober is somewhere within 1.3 to 5.2 seconds.
2. We would estimate, with 99% confidence, that the true population mean difference in reaction times Marijuana - Sober is somewhere within 1.3 to 5.2 seconds.
3. If we were to repeat this procedure a large number of times with similar sample sizes and at the 99% level of confidence, then we would expect that 99% of these confidence intervals would contain the true population mean difference in reaction times Marijuana - Sober.
4. We would estimate that the sample mean difference in reaction times Marijuana - Sober is 3.25 seconds with a 99% margin of error of 1.95 seconds.