Constructing time series graphs | Maths | Quizalize & Oak National Academy

Starter quiz

__________ is the mathematical term for a data point that is extremely large or small compared to the rest of the dataset.

An anomaly

An outlier ✓

A trend

A variable
Which of these points are not outliers?

A

B

C ✓

D

E ✓
Lucas says that he has a dataset with no outliers. Could Lucas be correct?

No, all datasets will have a lowest value.

No, there will always be a datapoint that is higher than the rest.

Yes, all data points will always cluster.

Yes, there may be no points that are far away from the main cluster of data. ✓

Yes, not every dataset has errors in it.
The scatter graph shows information about population and number of cars in a set of towns. Each point represents a town. Match each outlier to the correct statement.

A

⇔

town with a low population and many cars ✓

B

⇔

town with a high population and many cars ✓

C

⇔

town with a high population and few cars ✓

D

⇔

town with a low population and few cars ✓
Izzy says you should always ignore an outlier. Is Izzy correct?

Yes, if a data point is extremely small then it must be an error.

No, an outlier is just an unusual result in the data.

It depends, you should investigate each outlier carefully. ✓
Andeep says you should not show the outlier on a scatter graph. Is Andeep correct?

Yes, outliers are always too far from the rest of the data to show.

Yes, you may need to zoom in on the graph to use interpolation. ✓

No, otherwise the scatter graph is wrong.

No, the outlier may help highlight useful information. ✓

Yes, removing it can make the trend of the data easier to see. ✓

Exit quiz

A ______ graph is used to show data over a time period.

'time series' ✓
Izzy records how many birds appear in her garden over the course of a day. Here is her time-series graph. Izzy should label the horizontal axis ______. (Do not include units in your answer).

'time' ✓
A point on this axis has been labelled $p$ . The value of $p$ is ______.

'48' ✓
Jun plots a time series graph using time intervals that are regular and quarterly. The first month on his graph is April, the next quarter starts with the month of ______.

'July' ✓
The time-series graph shows information about internet connection in Great Britain in households with 1 adult aged over 65. In 2015, approximately ______ % of households have internet access.

'50' ✓
The time series graph to show the temperatures in Sheffield between 2012 and 2019. In how many quarters does the mean maximum temperature reach over 20°C ? ______ quarters.

'5' ✓

Worksheet

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Presentation

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Video

Lesson Details

Key learning points

Time series graphs are a visual representation
Time series graphs plot frequency over time
Consecutive points are joined by straight line segments

Common misconception

Time series graphs always use years as the time interval.

The time interval used in a time series graph depends on what the graph is intended to show.

Keywords

Time series graph - Time series graphs show data over a time period. The time period is always shown on the x-axis. Data points are joined chronologically by line segments.