Line of best fit

Emma wants to study the effect number of study hours per week has on marks obtained by a student. Marks obtained is the ____ variable.

• Dependent

• Independent

Lisa wants to know the effect of increase in greenhouse gases on the rising climate temperature. ‘Increase in green house gases’ is the _____ variable.

• Dependent

• Independent

Which graph shows a positive correlation?

• a

• b

The line of best fit shows the general change in the direction of an independent variable.

• True

• False

While drawing the line of best fit by hand, we sketch the line from each data point.

• True

• False

The independent variable is the effect.

• True

• False

The table shows the data for electricity generation at multiple amounts of coal used.

What is the mean electricity generated? Answer to two decimal places.

If the data points of a certain dataset are very closely situated within the line of best fit, then it is not necessarily a strong correlation.

• True

• False

If the data points rise from left to right, then it is a negative correlation.

• True

• False

If the correlation coefficient is positive, then the variables are inversely proportional to each other.

• True

• False