Unit 6 Practice Test - Extra Practice

Front

What is a positive correlation in a graph?

Back

A positive correlation indicates that as one variable increases, the other variable also increases.

Front

What does a correlation coefficient of r=0.9 indicate?

Back

It indicates a strong positive correlation between the two variables.

Front

What is the equation of a line of best fit?

Back

The line of best fit is a straight line that best represents the data on a scatter plot.

Front

How can you determine the number of square feet in a house using a graph?

Back

You can use the line of best fit to estimate the value based on the number of rooms.

Front

What does the slope of a line in a graph represent?

Back

The slope represents the rate of change between the two variables.

Front

What is the purpose of a scatter plot?

Back

A scatter plot is used to determine the relationship between two quantitative variables.

Front

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

Back

It means that changes in one variable do not affect the other variable.

Front

What is the formula for a linear equation?

Back

The formula for a linear equation is typically written as y = mx + b, where m is the slope and b is the y-intercept.

Front

How do you interpret the y-intercept in a linear equation?

Back

The y-intercept is the value of y when x is 0, indicating where the line crosses the y-axis.

Front

What is a line of best fit?

Back

A line of best fit is a straight line that best represents the data points in a scatter plot.