Statistics 2 by Mr Downes' Padlets https://padlet.com/rdownes/statistics2 en-us 2020-08-21 15:43:01 UTC 2025-10-06 23:32:22 UTC hello@padlet.com rw rdownes https://padlet.com/rdownes/statistics2/wish/691667065
Opinion polls are examples of questionnaires which are used to gauge public opinion. They most used in the run-up to an election to try and forecast who the public will vote for.


This page from Britain Elects shows a time series graph about individual voting intentions for the UK Parliament. The graph is a little more complicated than those you have seen above in a couple of respects:

  • there are several series: each political party has its own line; and
  • the time series plotted is a moving average of the previous 7 data points collected—with some further adjustments.
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  • A knowledge of the four operations from lessons N2a, N2b, N2c and N2d.
  • S2a – Frequency tables and two-way tables
  • S2c – Bar charts, vertical line charts and basic histograms
  • S4a – Median

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  • N2a – Adding and subtracting positive integers
  • S2a – Frequency tables and two-way tables
  • S4a – Median
  • S4e – Interquartile range and box plots

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  • N1a – Ordering positive and negative integers
  • N1b – Ordering decimals
  • S2a – Frequency tables (for Part 2 of this lesson)

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    The median is sometimes a better average to use than the mean, which is another type of average.


    Consider two small companies ParCo and OliCo. Each company has one manager and nine other employees. The salaries paid are as follows:

    • ParCo: The manager earns £50,000 and the other nine employees earn £20,000 each.
    • OliCo: The manager earns £90,000 and the other nine employees earn £18,000 each.

    Imagine both companies are recruiting an extra employee. Would you rather work for ParCo or OliCo?


    The mean salary at ParCo is £23,000 compared to £25,200 at OliCo, which makes OliCo look more attractive.


    The median salary at ParCo is £20,000 compared to only £18,000 at OliCo, and this makes ParCo look more attractive.


    Which type of average is better to use in this case?

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