The EzyEducation website uses cookies to help ensure we give you the best experience.
If you continue without changing your settings, we assume that you are happy to receive all cookies on the EzyEducation website.
Please refer to our Privacy and Cookies Statement to

find out more.

Continue

We have introduced focussed foundation level GCSE Combined Science courses for AQA and Edexcel. Please contact info@ezyeducation.co.uk to obtain access. 

Countdown to Exams - Day 23 - Histograms

Countdown to Exams - Day 23 - Histograms

On day 23, our focus is on Histograms which is a special 'Bar' chart for grouped data and will often have different widths. Beware the trap that the y axis is NOT frequency but should be labelled frequency density.  The formula for calculating frequency density is covered in this snapshot and you may need to create extra columns in order to calculate this. 

By rearranging the formula, you can calculate the frequency of each bar by multiplying frequency density by the bar width. This will help to fill in an incomplete data table.

Continue reading
  2157 Hits
  0 Comments

Countdown to Exams - Day 19 - Averages from a Grouped frequency table

Countdown to Exams - Day 19 - Averages from a Grouped frequency table

On day 19 we extend our understanding of averages by looking at Grouped frequency tables. Here you will find that your data has been grouped into categories. It is important to note a change in the vocabulary for the questions. Because the data is grouped, you will be unable to use specific values as you don't know what they are hence you will be asked to find an estimate for the mean or an estimate for the median.

You will often have to create two extra columns, one for the midpoints of each group and one for your fx column.

Continue reading
  2508 Hits
  0 Comments
Forgot your password?