Term

Definition
Measures the typical distance between sample and population mean. Conceptually similar to SD. SD deals with individual x and SEM deals with sample means. 


Term

Definition
Individual x scores take up space under the curve. 2 vertical lines represent real limits of binomial x score when dealing with binomials. Real limits help to find probability and either include or exclude space. 


Term
Distribution of Sample Means 

Definition
Distribution of all possible samples of a given size (n). SD: all samples=same size, same n. All n are equal, samples vary. RD: entirely made up of sample means. 


Term
When is the distribution of sample means normal? 

Definition
When the sample is greater than or equal to 30. If population of individual x scores is normally distributed. 


Term

Definition
Alpha is probabilitydefines unlikely outcomes based on random variability. p<.05: statistically significant, evidence is sufficient to reject the null. 


Term

Definition
Mean of all sample means. Calculated by taking sum of all sample means and dividing by # of samples. 

