no notes reference notes for oct 23

hypochondriac - illness anxiety ; excessive and debilitating

one sample z - test converts any sampling distribution into a standard normal dis.

z = (M - /uM)

• .

standard error (SE)

oM = o

• sq rt N

problem w Z is that we rarely know the population sd or variance

t statistic is an approach to looking at how our sample score differs from the null hypothesis

N-1 leads to a slightly larger and more accurate sd