解析 C We have two formulas for test statistics for the hypothesis of equal sample means. Which one we use depends on whether or not we assume the samples have equal variances. Either formula generates a test statistic that follows a T- distribution....
Test of a hypothesisGanzhorn, Joerg U
A test of a hypothesis that the means of two normally distributed populations are equal based on two independent random samples: A. is based on a Chi Square statistic. B. is a paired -comparisons test. C. is done with a t -statistic. 点击查看答案&解析手机看题 你可能感兴趣的试题 单项...
题目To test a hypothesis, scientists often conduct ___. A. guesses B. surveys C. experiments D. speculations 相关知识点: 试题来源: 解析 C。为了测试一个假设,科学家经常进行实验。“guesses”猜测,“surveys”调查,“speculations”推测,都不是测试假设的主要方法。反馈 收藏...
aCultural differences and the formation of the physical environment in English and Chinese 文化差异和物理环境的形成用英语和汉语 [translate] akeering your hair in tip top condition with styles that 在技巧上面条件keering您的头发以样式那 [translate] aHe was named one of the world's Top 12 Young ...
D. reject the null hypothesis and conclude that the population mean is significantly different from zero. 正确答案:D 分享到: 答案解析: At a 5% significance level, the critical t-statistic using the Student’s t-distribution table for a two-tailed test and 19 degrees of freedom (sample ...
8a. TEST OF HYPOTHESIS(2)TestofHypothesis Dr.JosephineQ.BorjaENGSTAT StatisticalDecisionTheory Decisionsmadeonsampleinformation. DecidewhetherobservedsamplesdiffersignificantlyfromthatofthepopulationHypothesis-Assumptionsorguessesaboutthepopulation.StatisticalHypothesis–astatementabouttheparametersofoneormore...
Thus, the power of a hypothesis test is the probability of not committing a Type II error.【释义】检测力度(power of a test)是当原假设为为假时,拒绝假设的可能性。第二类错误是原假设为假但没有被拒绝。因此检测力度就是不犯第二类错误的概率。
we decide how to summarize the relevant characteristics of the sample data in a single number, the so-calledtest statistic; we derive theprobability distribution of the test statistic under the hypothesis that the null is true(the data is regarded as random; therefore, the test statistic is a...
A. experiments B. exercises C. lessons D. studies 相关知识点: 试题来源: 解析 A。“test the hypothesis”需要通过“experiments”(实验)来进行,B 选项“exercises”指练习,C 选项“lessons”指课程,D 选项“studies”侧重学习、研究,都不如“experiments”符合语境,故选 A。反馈...