InDealing with Familywise Error, we describe some approaches for handling familywise errors. We now show how to apply these techniques when multiple paired t-tests are performed. Example Example 1: A new drug is being tested for its effectiveness over a period of 4 weeks (T1 = baseline, be...
Paired t-Test Example Using QI Macros If a diet claims to cause more than a 10 lb weight loss over a six month period, you could design a test using several individuals before and after weights. The samples are "paired" by each individual. You might want to know if the diet truly del...
1、安装分析工具库，以2007为例，EXCEL选项－－加载项－－转到，勾选分析工具库；2、安装后在“数据”菜单自动添加了“分析”功能区；3、使用，数据－－分析－－数据分析，选择：“t－检验：平均值的成对二样本分析”。
Cohen's d- (Standardized effect size) - the value in 'Effect size' is the difference between the means divided by the standard deviation. Two-tailed paired t-test example: forty people are given treatment to reduce their cholesterol levels, with an expected reduction of 10mg/dL. The distribu...
Suppose we run the same analysis for the data in Example 1 fromTwo Sample t Test with Equal Variancesusing the t-test with independent samples and compare the results with those we obtained for paired samples: Figure 6 – Excel data analysis for independent samples ...
Student's paired t-test: when to use it Student's paired t-testallows to compare the means of two series of measurements performed on the same statistical units. For example: the photosynthetic rate of 30 plants is followed at two moments during the day: morning and afternoon.Student'spaire...
SPSS Paired Samples T-Test Dialogs Paired Samples T-Test Output Effect Size - Cohen’s D Testing the Normality Assumption Example A teacher developed 3 exams for the same course. He needs to know if they're equally difficult so he asks his students to complete all 3 exams in random order...
Is it appropriate to enter only the variables that are significant into the Hotelling test, i.e. first perform separate paired t-tests, then discard the ones that are not significant, and enter the remaining significant outcomes into the Hotelling test? For example, say there are 10 ...
Paired T Test Example For example, imagine we have a training program and administer a pretest and posttest to the same sample of students. Consequently, each student has a pair of test scores. We need to determine whether the average change for the pairs of scores is different from zero....
1,SPSS Paired Samples T Test Instatistics, apaired difference testis a type oflocation testthat is used when comparing two sets of measurements to assess whether theirpopulation meansdiffer. A paired difference test uses additional information about thesamplethat is not present in an ordinary unpaired...