Which function has an inverse that is also a function?
{(-4, 3), (-2, 7), (-1,0), (4, -3), (11, -7)}
{(-4.6). (-2, 2), (-1, 6), (4,2), (11, 2)}
{(-4.5), (-2. 9), (-1, 8), (4, 8), (11,4)}
{(-4,4), (-2, -1), (-1,0). (4. 1). (11, 1)}

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.