GCSE Secondary Maths Age 13-17 - Probability & Statistics: Time/Series Graph - Explained

The video tutorial explains how to interpret a time series graph showing the percentage of villagers using a shop from 1980 to 2010. It describes the trend of decreasing usage over time and demonstrates how to predict future usage for 2020 using a line of best fit. The tutorial also discusses the reliability of such predictions, noting that predictions beyond the given data range are uncertain. Finally, it covers the allocation of marks for related exam questions and the usefulness of drawing trend lines.

What trend is observed in the percentage of people using the village shop from 1980 to 2010?

What percentage of people in the village is predicted to use the shop in 2020?

Why is the prediction for the year 2020 considered unreliable?

What factors could affect the reliability of the prediction made for 2020?

How many marks were allocated for the prediction question, and what was the criteria for scoring?