ESS210B
Prof. Jin-Yi Yu
Two kinds of Two-Sample t-Test
qFor samples come from distributions with different
standard deviations, having
values of s1 and s2. This is called “unpooled two-sample t-statistic”:
qIf both
distributions have the same standard deviation, then we can “pool” the estimates of the standard deviation
from the two samples into a
single estimate:
