T14 - Writing equations for trend lines

Front

What does a negative correlation between x and y values indicate?

Back

As x increases, y decreases.

Front

What is the purpose of a line of best fit?

Back

To make predictions.

Front

Write an equation for a trend line with a slope of 2.5.

Back

y = 2.5x.

Front

What correlation exists between study time and test grades?

Back

Positive correlation.

Front

What is the equation of the line of best fit if the slope is -25 and the y-intercept is 170?

Back

y = -25x + 170.

Front

Define 'line of best fit'.

Back

A line that best represents the data on a scatter plot, used for making predictions.

Front

What does a positive correlation between two variables mean?

Back

As one variable increases, the other variable also increases.

Front

How do you determine the slope of a trend line?

Back

By calculating the change in y over the change in x (rise over run).

Front

What is the significance of the y-intercept in a linear equation?

Back

It represents the value of y when x is 0.

Front

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

Back

There is no predictable relationship between the variables.