Statistics Review

Front

What does a correlation coefficient (r) of -0.87 indicate?

Back

A strong negative correlation between two variables.

Front

What is the equation of a linear regression line?

Back

y = mx + b, where m is the slope and b is the y-intercept.

Front

If a team practices 4.5 hours per week, how can we predict the number of matches they will win using the equation y = 3.14x + 3.52?

Back

Substitute x with 4.5: y = 3.14(4.5) + 3.52 = about 18.

Front

What does a correlation coefficient (r) of 0.913 signify?

Back

There is a strong positive correlation between the number of years of education and annual salary.

Front

What percentage of students have less than 1,000 songs on their MP3 players if the answer is 20%?

Back

20% of students have less than 1,000 songs.

Front

Define 'correlation coefficient'.

Back

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

Front

What is the range of values for a correlation coefficient?

Back

The range is from -1 to 1.

Front

What does a correlation coefficient of 0 indicate?

Back

No correlation between the two variables.

Front

What is the meaning of a strong positive correlation?

Back

As one variable increases, the other variable also increases.

Front

What is the meaning of a strong negative correlation?

Back

As one variable increases, the other variable decreases.