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1

What is a time series graph?

A line graph with time plotted on the x axis

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2

What does a trend line do?

Shows the general trend of the data

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3

What kinds of trends are there?

Rising, level or falling

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4

What’s a seasonal variation?

Variations in a time series following a regular time period like days of the week or seasons

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5

Whats a moving average?

An average worked out for a given number of successive observations

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6

What do moving averages do?

Smooth out the fluctuations the data and make the trend line more accurate

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7

How to calculate seasonal variation

Actual value- trend value

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8

How do you plot a moving average?

Plot them at the midpoint of the time interval

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9

How to calculate estimated mean seasonal variation

Mean of all seasonal variation for that season

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10

What’s another way to say seasonal variation

Seasonal effect

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11

What’s another way to say estimated mean seasonal variation?

Average seasonal effect

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12

How to calculate predicted value

Trend line value+ EMSV

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13

What does the reliability of a prediction depend on?

How far into the future the prediction is

How consistent the SV is

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