STATS Extra Credit

What is the essence of all inferential statistics?

Using sample data to make statements about the scores and relationships in the population

When is a t-test used instead of a z-test?

When the population standard deviation is unknown

In statistics, a sample is

a subset of a group to which a law is applied.

In a linear relationship, as the X scores increase, the Y scores change

in only one direction.

The best predictor of an individual score in a sample of scores is the

mean of the sample of scores.

In statistics, a symmetrical, bell-shaped polygon is called a/an

normal curve.

Measures of variability are used to

summarize and describe the extent to which scores in a distribution differ from one another.

In statistics a population is

the entire group to which a law of nature applies.

In statistical notation, N stands for the

total number of scores in a data set.

What do we call the portion of the sampling distribution in which values are considered too unlikely to have occurred by chance?

Critical region