qWe want to compare the averages from two
independent samples to determine
whether a significance exists between the samples.
q
qFor Example:
q * One sample contains the
cholesterol data on patients taking a standard drug, while the second sample contains
cholesterol data on patients
taking experimental drug. You would test to see whether there is statistically significant difference between
two sample averages.
q
q * Compare the average July
temperature at a location produced in a climate model under a doubling versus no doubling
CO2 concentration.
q
q * Compare the average
winter 500-mb height when one or the other of two synoptic weather regimes had prevailed.