WJEC A-Level Business 601-5238-2
Enterprise and Starting a Business
Markets and Market Research
Marketing
People in Business
Operations Management
Business Finance and Accounts
Business Analysis and Decision-Making
Strategy and Implementation
Managing Change and Risk
The External Environment
Business Analysis and Decision-Making
Moving averages and time-series analysis
- 3 things to know
- A2 Unit 3
Overview
Time-series analysis, trend in a time series and purpose of calculating a moving average.
What you need to know
Answer each one before you reveal it.
Name the components a time series is broken down into.
Define the trend in a time series.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is time-series analysis?
Model answer
Time-series analysis examines figures recorded at regular intervals over time in order to identify the pattern within them.
- 2
Name the components a time series is broken down into.
Model answer
The underlying trend, seasonal variations, cyclical variations and random or irregular variations.
- 3
Define the trend in a time series.
Model answer
The trend is the underlying long-term direction of the figures once short-term fluctuations have been smoothed out.
- 4
Explain the purpose of calculating a moving average.
Model answer
It smooths out short-term fluctuations so the underlying trend in the data becomes visible.
- 5
State how a three-point moving average is calculated.
Model answer
Add a figure to the one before it and the one after it, then divide the total by three, and record the result against the middle period.
- 6
Quarterly sales in £000 are 120, 132, 141, 150 and 162. Calculate the three-point moving average centred on the second figure.
Model answer
The three-point moving average is (120 + 132 + 141) ÷ 3, which is 131 thousand pounds.
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