The teacher of a class needs to select two volunteers from a class of 12 boys and 10 girls. She randomly selects one student and then randomly selects another one . What is the probability she selects one boy and then one girl “think about this one “ can you select both students at the same time or does selecting one affect the other ? Should the denominator change ? is this independent or dependent?

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.