Một bánh xe có đường kính 500mm chạy với vận tốc 36km/h Tính
a) tốc độ dài, tốc độ góc, gia tốc hướng tâm
b) số vòng quay trong thời gian 1 phút của 1 điểm trên vành bánh xe

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.