If the sample size is greater than 30 and population variance is unknown, the appropriate test for the sample mean is the: A. t -test. B. z -test. C. t -test or z -test. D. p -test or F -test.相关知识点: 试题来源:
If the sample size is greater than 30 and population variance is unknown, the appropriate test for the sample mean is the:A. t-test.B. z-test.C. t-test or z-test.D. p-test or F-test. 正确答案:C 分享到: 答案解析: The central limit theorem makes it appropriate to use the z-...
you will find that several rules of thumb are proposed, for example, that the sample size should be greater than 30 or 50 for large sample results to approximately hold. These rules of thumb are usually derived under very special assumptions and have no general validity. ...
Once again, let's compute the power against the alternative P=0.33 for a range of sample sizes. We'll use a one-sided (right-tailed) test because we're interested only in alternative values greater than 30%. Get Nvec = 50:50:2000; power = sampsizepwr('p',p0,p1,[],Nvec,'tail...
30: The data is predicted to be abnormal. @modelarts:size Array of objects Default attribute: image size, including width, height, and depth. The type is List[/topic/body/section/table/tgroup/tbody/row/entry/p/br. {""}) (br]. In the list, the first number indicates the width (pixe...
Near-misses elicited greater SCRs than full-misses among females (p < 0.001) but not among males (p = 0.813) (Table 3). Table 3 Sex differences in physiological and subjective ratings (ANOVA) Full size table The effect of gambling outcome was significant for HR acceleration (...
(Hennink et al., 2017). This broader application of saturation focuses more on assessing sample size rather than the adequacy of data to develop theory (as in theoretical saturation). When used in the broader context, saturation refers to the point in data collection when no additional issues ...
TPC-H is a test set developed by the Transaction Processing Performance Council (TPC) to simulate decision-making support applications. It is widely used in academia and
商业统计学英文课件:ch10_ch11Two-Sample Tests and.ppt,Chap 10-* Total Variation (continued) Chap 10-* Among-Group Variation Where: SSA = Sum of squares among groups c = number of groups nj = sample size from group j Xj = sample mean from group j X = gran
On the other hand, if the experimenter wishes to discard the first two and last three data, the required sample size is n = 33 ; obviously, the optimal sampling plan would be 3 , 30 , 33 . 5. Illustrative Examples Three numerical examples are considered in this section to illustrate the...