## Equations

This topic is largely the same as the old standard, although it used to be an external.

Practice 1
Practice 2
Practice 3
Practice 4
Practice 5
Practice 6
Worksheets with a couple of exercises at each level.

This is quite a good explanation of the process for solving 3 x 3 equations by hand from

http://www.slideshare.net.

Extension work
## Linear Programming

This topic is largely the same as the old standard, although it used to be an external.

Practice 1
Practice 2
Practice 3
Practice 4
Worksheets, with an Achieved example first, followed by a Merit/Excellence example. The later ones are harder.

## Bivariate Data

This topic has changed quite a bit in the last few years, most especially in terms of the types of data given, so care needs to be taken with older material. That said, the underlying Maths hasn't changed.

Notes and Worksheet
Answers
The scope of the old unit, with spaces for questions, and the same but with answers.

The original for the worksheet can be found at http://www.stat.auckland.ac.nz/~teachers/2003/regression.php along with other resources.
Crackers: Exercise and Answer
Exercise with model answers.

Fertility Exercise
Bond Yields Exercise
More Data Sets
Data to practice on.

NZQA Exemplar A
NZQA Exemplar B
Examples of student work given by NZQA which show the boundary between the various grades. Note how answers alone do not achieve a grade unless backed up with analysis.

## Time Series

Time Series Notes
Three sets of PowerPoint slides. The first goes through the process of analysing the data in Excel. The next two look at some extension areas.

Channel Ferries
Exercise with model answers and annotations.

Guest Numbers
Another set of model answers, showing a different way of structuring the report.

Data Sets for Practice
NZQA Exemplars Page
Examples of student work given by NZQA which show the boundary between the various grades. Note how answers alone do not achieve a grade unless backed up with analysis.

These tend to be on the short side and I would suggest more analysis and different graphs for the different parts, rather than combining all information onto the same (very busy) graph.