which t test to use 
the following flowchart can be used to determine which t test to use based on the characteristics of the sample sets the key items to consider include the similarity of the sample records the number of data records in each sample set and the variance of each sample set image by julie bang investopedia 2019example of an unequal variance t testassume that the diagonal measurement of paintings received in an art gallery is taken one group of samples includes 10 paintings while the other includes 20 paintings the data sets with the corresponding mean and variance values are as follows though the mean of set 2 is higher than that of set 1 we cannot conclude that the population corresponding to set 2 has a higher mean than the population corresponding to set 1 