Prob and Stat - FINALS PRACTICE #4

Front

What is a best-fit line used for?

Back

To make predictions.

Front

What does a correlation coefficient of -0.26 indicate?

Back

It indicates a weak negative correlation.

Front

In a study showing a strong positive correlation between stork populations and human births, which statement is false?

Back

If we breed more storks, there will be more humans born.

Front

If Joe worked 30 hours and earns $20 per hour, how much is he expected to earn?

Back

$600.

Front

Using a trend line, predict the number of chapters in a book with 180 pages if the trend suggests 18 chapters for that page count.

Back

18 chapters.

Front

What is the purpose of a scatter plot in statistics?

Back

To visually display the relationship between two quantitative variables.

Front

Define correlation coefficient.

Back

A statistical measure that describes the strength and direction of a relationship between two variables.

Front

What does a correlation coefficient close to 1 indicate?

Back

A strong positive linear relationship between two variables.

Front

What does a correlation coefficient close to -1 indicate?

Back

A strong negative linear relationship between two variables.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation indicates that one variable directly affects another.