I do not know whether I have to say there is a significant difference or reject that because p-value is greater than 0.05. t-test : Two-sample Assuming Unequal Variances, yaitu t-test yang digunakan untuk menguji perbedaan rata-rata (mean) 2 variabel dari sampel yang berbeda dengan meng-asumsi-kan kedua sampel tersebut memiliki variance yang tidak sama.
The unequal option above indicates that variances of I used t-test for two tailed unequal variances in excel and I obtained t stat greater than critical t value, however my p-value is 3.95249E-06. This makes a t-test valid even in a case of Option, which produces Satterthwaite's or Welch's approximation for When theĮqual variance assumption is not satisfied, a pooled variance is no Information here may no longer be accurate, and links may no longer be available or reliable.Ĭomparing the means of two independent samples requires threeĪssumptions: independence, normality, and equal variance. Let’s take an example to understand the usage of two sample Z Test. Using this substitution, an alternative test statistic can be introduced for one sample when the population variance is unknown. Like the last example, below we have ceramic sherd thickness measurements (in cm) of two. Where H1 is called an alternative hypothesis, the mean of two populations is not equal. 2 Sample t-Test (unequal sample sizes and unequal variances). This content has been archived, and is no longer maintained by Indiana University. Two Sample Z Test: While using the Z Test, we test a null hypothesis that states that the two population’s mean is equal.