AQA GCSE Statistics Summarising data overview quiz quiz

$9$

$8$

$7$

$32$

$5.0$

$4.0$

$4.8$

$6.0$

$7$

$12$

$3$

$9$

$12$

$40$

$20$

$26$

$\sqrt{25} = 5$

$\sqrt{5} \approx 2.24$

$\sqrt{30} \approx 5.48$

$2$

Negatively skewed

Symmetrical

Positively skewed

It cannot be determined

The arithmetic mean

The range of the data

The total of all values

The median

One average and one measure of spread, in context

Two different averages on their own, with no measure of spread at all

Two measures of spread together, with no average mentioned

The two largest values in each set

$\frac{\sum fx}{\sum x}$

$\frac{\sum fx}{\sum f}$

$\frac{\sum fx}{n}$

$\frac{\sum x}{n^2}$

It is much quicker and simpler to calculate than the ordinary range

It always gives a larger number than the range does

It uses only the middle half, so it ignores extreme values

It uses every single value in the whole data set

Because the class midpoints are simply guessed at random with no real basis

Because the recorded frequencies in the table are always rounded to whole numbers

Because the formula for the mean of grouped data is only ever an approximation

Because the exact values within each class are unknown, so midpoints are used

The standard deviation

The range

The interquartile range

The median