12) on the way to the library, john walks 8 blocks from his house before realizing that he should have stopped at the post office to buy stamps. since the post office will be closing soon, he decided to turn around and walk 3 blocks on the same route back to the post office. after buying stamps, he walks 11 blocks to the library. which statements are correct for this situation?

On a certain portion of an experiment, a statistical test result yielded a p-value of 0.21. what can you conclude? 2(0.21) = 0.42 < 0.5; the test is not statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 21% of the time, so the test is not statistically significant. 0.21 > 0.05; the test is statistically significant. if the null hypothesis is true, one could expect to get a test statistic at least as extreme as that observed 79% of the time, so the test is not statistically significant. p = 1 - 0.21 = 0.79 > 0.05; the test is statistically significant.