The horizontal axis in the sampling distribution of represents all possible sample proportions from a simple random sample of size n. What percent of sample proportions results in a % confidence interval that includes the population proportion? What percent of sample proportions results in a % confidence interval that does not include the population proportion? (This is a reading assessment question. Be certain of your answer because you only get one attempt on this question.)

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.