Type 1 and Type 2 errors

A type 1 error results in a false

positive

A type 2 error results in a false

negative

false positive

saying a client does have a disorder when they actually do not. Type 1 error

false negative

saying a client does not have a disorder when they actually do. A type 2 error.

Sensitivity

how well test identifies presence of disorder

Specificity

How well a test identifies the absence of a disorder

sensitivity is to ____, where specificity is to ______

power, probability

Power

-A quantitative index of the sensitivity of an experiment

-refers to the probability of making the correct decision of rejecting the null

if the power is .8 then the beta will be

.2

One tailed tests are for

directional hypothesis

Two tailed tests are for

non-directional hypothesis

Degrees of freedom

- The number of values free to vary in a data set once a characteristic is known or set

- Df = n-1 (n = sample size)