Card Set Information
Hypothesis Test when St deviation is known
it estimates the deg to which the null hypothesis is false compared to the alternative null. related to Power, in that if ES is High then power is as well.
is a special value computed from a sample that is used in deciding btwn the Ho and H1. A z-score.
A P value
is the smallest alpha that would allow rejection of the null. (p <.05)
The null hypothesis is about a specific population parameter.
When the hypothesis specify shape of the population
1. no change of difference
2. proposes a specific value for the parameter
3. helps to construct the sampling distribution
Values specified by the decision rule. often set by alpha, alpha-.05 directional- CV-1.64 the rejection is anything after this value.
is represented by alpha.
is also called a Z score and is the value of the test statistic that begins the rejection region.
Type I error = alpha
Occurs when the Null is rejected when it really is correct. always equals the alpha, so if alpha is .05, you have a 5% chance that your making a Type I error.
Type II error
Is made when the null is not rejected when it really is incorrect. ( beta ) related to power!
1 Step in Hypothesis Testing
pop- norm dist/samp sz
samp- random -w/i
data - interval /ratio
2 Step in Hypothesis Test
state the nul - H0 there is no change or diff in the pop an is specific
state the alternative and direction .
3 Step in Hypothesis Testing.
Test statistic - Z score and st error of the mean.
4 Step in Hypothesis Test
Decision Rule- used to decide which hypothesis provides a better description.
Choose a Sig level- alpha.
5/6 Step in hypothesis
5- sample and compute
6- Decide and conclude.
1-(beta) is the probability of making the correct decision of rejecting and incorrect Ho.
"it's the chance of finding an effect that truly exists"
Power is incred, by decre (beta)