How much your data is worth - and how to stop people profiting from it

Do you know the true value of your data? Businesses all over the internet certainly do know its worth - so here's what you can do about that.
BBC

Forming a linear model from a given set of data

Now try the example questions below. Use the equation of the line of best fit to estimate Jill's score in her science test if she scored 14 in her Maths test. The general equation for a straight line ...