AQA GCSE Statistics Scatter diagrams and correlation overview quiz quiz

Weak negative correlation

Strong positive correlation

Strong negative correlation

No correlation

A correlation coefficient is always a sign of a calculation mistake somewhere

Correlation can only ever be measured between a single variable and itself

The link may be coincidence or caused by a confounding third variable

Causation in statistics can never be established by any method at all

The retail price of an ice cream

The total number of public beaches

The day of the week it happens

Hot weather (temperature)

$13$

$10$

$25$

$7$

Predicting within the data range; it always ignores every outlier present

Predicting outside the data range; the pattern may not continue

Calculating the mean point of the data; it completely hides the trend

Ranking all of the data values; it loses the actual measured numbers

$0.4$

$0.96$

$0.6$

$-0.6$

The origin $(0, 0)$ at the very start

The single highest plotted data point

The median of the $x$ values only

The mean point $(\bar{x}, \bar{y})$

Strong reverse agreement in the rankings

Strong agreement in the rankings

No relationship in the rankings

A calculation error, as it must be positive

A point lying exactly on the drawn line of best fit

A point that lies far from the overall pattern of the data

The calculated mean point at the centre of all the data

Any plotted point that happens to have a negative coordinate

Height and shoe size

Outside temperature and heating costs

Age of a car and its value

Hours studied and exam mark

To force the line to pass straight through the origin

To connect the very first and the very last plotted points

To deliberately highlight and emphasise the outliers

So the line represents the average trend of all the data

Interpolation

Extrapolation

Standardisation

Stratification