Review Unit 4B: Statistical Analysis

What is the typical cutoff for a correlation showing a “strong” linear relationship?

Below what level of correlation  would typically be considered “no relationship” between variables?

Describing the correlation based on the description given:

The data are extremely scattered but overall they slope downward very steeply

• Strong positive correlation

• No correlation

• Weak positive correlation

• Strong negative correlation

• Weak negative correlation

Describing the correlation based on the description given:

There is very slight upward slope to the data points which are all in very nearly a line

• Strong positive correlation

• No correlation

• Weak positive correlation

• Strong negative correlation

• Weak negative correlation

Fill in the blank with either “correlation” or “causation.” 

Observational studies can only show _______________, while experiments can determine ________________.

Put a ; and space between the answers.

A ____ is a set of all items or events which are of interest for some question or experiment.

A ____ is a selection of observations from a population.

Can determine causation between variables

• Observational Study

• Experiment

• Both

Researcher does not affect the subjects

• Observational Study

• Experiment

• Both

Requires collection of data

• Observational Study

• Experiment

• Both