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Long Term Trend
Note: iNZight graphs do not have labels on the vertical axis. For Merit or better you will need to add a label with units on the vertical axis
Achieve
Produce a time series graph then discuss the Long Term Trend
This MUST be quantitative - with numbers and amounts of change.
It is NOT enough to say "the trend steadily increases"
Discuss whether the trend is linear or not.
Discuss the amount of change of the trend.
Discuss the rate of change eg how much increase per month.
eg: The trend increases from 9.5 million km2 in 1990 to about 8.5 million km2 in 2010
Merit
As for Achieve but the discussion is in context.
eg:
The average area of arctic sea ice increases from 9.5 million km2 in 1990 to about 8.5 million km2 in 2010.
Some more detailed description - such as smaller variations in the trend line or possible reasons for the changes.
Excellence
Detailed thoughtful discussion:
Explanation for variations in the trend line,
Non-linear trend models,
Piecewise models,
Comparison of iNZight & Excel'
Recent variation in iNZight trend line...
Exemplar
REMEMBER: there are no indication of units and scales on the vertical axis. You MUST incorporate this.
eg. Sea Ice is measured in millions of km2
Discussion: Of the Long Term Trend in very general terms but in context
eg. The Arctic Sea Ice area has decreased from about 9.5 million km2 in 1990 to about 8.5 million km2 in 2010
In more detail:
The Arctic sea ice area changes from 9.5 million km2 in Jan 1990 to about 8.5 million km2 in March 2011, which is a change of 1 million km2 over 21 years and 3 months (which is 254 monthly increments) so the average sea ice change is about 4000 km2 per month (1 000 000 Ă· 254)
Trend Video (you tube video by Priscilla Allan)
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