Edexcel GCSE Mathematics Statistics overview quiz quiz

$6$

$30$

$5$

$9$

$8$

$6$

$9$

$7.6$

$18$

$23$

$5$

$14$

Add up all the different values listed in the table and divide that total by the number of rows

Multiply each value by its frequency, add these, then divide by the total frequency

Take the value that has the highest frequency in the table

Subtract the smallest value in the table from the largest

The lower boundary of each class interval

The upper boundary of each class interval

The midpoint of the class

The frequency of the class

$30^\circ$

$120^\circ$

$90^\circ$

$108^\circ$

The number of pets a person owns

The height of a tree

The colour of a car

The number of goals in a match

$20$

$40$

$60$

$80$

$42$

$12$

$21$

$27$

Positive correlation

Negative correlation

No correlation

Causation only

Because the line of best fit is always completely wrong, even within the range of the data

Because the relationship may not continue outside the observed range

Because scatter graphs are never able to show any correlation at all

Because the data on a scatter graph is always qualitative

The mean

The median

The mode

The range

It is far too large a sample to handle easily

Some groups are over- or under-represented

It uses random selection to pick every member

It includes the whole of the population, not a sample

One variable definitely causes the other to change

The two variables tend to change together

There is no relationship between the variables

The data being plotted must always be qualitative