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 people using a village 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. Marks allocation for the questions is also covered.

What does the time series graph represent in the context of the village shop?

• The percentage of people using the village shop

• The number of shops in the village

• The total sales of the village shop

• The population growth of the village

What is the purpose of drawing a line of best fit on the graph?

• To mark the midpoint of the data

• To highlight the highest data point

• To connect all data points

• To show the trend of the data

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

• 25%

• 15%

• 10%

• 20%

Why is the prediction for 2020 considered unreliable?

• The data for 2020 is not available

• The prediction uses incorrect data

• The prediction is outside the given data range

• The prediction is based on a different village

What could potentially affect the accuracy of the prediction for 2020?

• Changes in local infrastructure

• The introduction of new shops

• Closure of local supermarkets

• All of the above