what is welch correction in statistics do t tests show unequal variance should welch correction be used for multiple comparisons on t-test how to correct for unequal variance in t test if you do multiple comparisons with a t-test when using t test do you correct for multiple comparisons how to correctly correct for multiple comparisons what should be corrected for multiple comparisons with t test when using a t-test to compare groups, should i use welch correction why use welch correction when a t test requires welch correction for multiple comparison can t test use welch correction does a welch correction need to be used for all the comparisons with t-test? how to compare three groups on t test when do t tests include multiple comparisons why use welch correction which type of correction should be used when comparing multiple groups when to use welch correction if welch correction for t test why use welch correction