Stats ch 6, 7, 8

The null hypothesis states that no change occurs because of the treatment

Symbol for null hypothesis

A result is significant when:

Hypothesis testing is a standardized method to evaluate results of research studies

the alternative or research hypothesis states that there is a change due to the treatment

What is the typical alpha level?

a larger sample size means there is a greater likelihood of finding a significant result

reducing the alpha level reduces power

The measurement of the absolute magnitude of a treatment effect

rejecting Ho when it is really true

The idea that sometimes you get deviations from the mean just by chance

increasing the sample size increases power

if Zobtained < Zcritical

which is not a symbol for the research hypothesis

the probability that the test will identify a treatment effect if one really exists

retaining Ho when it is really false

the Z critical value with an alpha of .05 and a two-tailed test

test used to compare the sample M to population mean when the population StdDev is not known

Reject Ho if...

When running tests, always follow the same steps in a logical, organized order...

How do you calculate Z(obtained) for a z test?

Retain Ho if...

probability value used to identify low-probabililty samples

if Zobtained > Zcritical

More variability means there's a lower likelihood of finding a significant effect