Stats Units 1-5 Midterm Review

Front

What is a stratified sample?

Back

A stratified sample is selected by dividing the population into subgroups (strata) and then taking a fixed number of units from each group using a simple random sample.

Front

What type of correlation indicates that as one variable increases, the other variable also increases?

Back

Positive Correlation.

Front

What type of correlation indicates that as one variable increases, the other variable decreases?

Back

Negative Correlation.

Front

What does it mean if there is no correlation between two variables?

Back

It means that there is no predictable relationship between the two variables.

Front

If the length of a running start increases, what happens to the distance of the jump?

Back

The distance of the jump increases (positive correlation).

Front

How many students got a perfect score on the test if the options are 0, 1, 2, or 6 and the answer is 2?

Back

2 students got a perfect score.

Front

What is the definition of correlation in statistics?

Back

Correlation is a statistical measure that describes the extent to which two variables change together.

Front

What is a cluster sample?

Back

A cluster sample is selected by dividing the population into clusters (groups) and then randomly selecting entire clusters.

Front

What is the purpose of using stratified sampling?

Back

To ensure that different subgroups of a population are adequately represented in the sample.

Front

What does a positive correlation graph look like?

Back

A positive correlation graph slopes upwards from left to right.