In a meaningful context, students will be able to explain the meaning of negative numbers, sketch and interpret graphs which represent everyday situations and make statements about time-related variation.

The graphs to the right show the maximum and minimum temperatures for December in Rotorua and Wellington.

Tau koura was the favourite traditional fishing method for harvesting lake koura and involved resting bundles of bracken fern fronds on the lake bed for koura to take refuge in and then retrieving the bundles into a canoe to harvest the koura.

New Zealand lakes and ponds often have large populations of koura or freshwater crayfish.

How to use this key
Running the key
Install the Lucid Player
This key has been built with the Lucid Builder and you need the Lucid Player installed on your computer to be able to use the key. The standard edition is a free download from LucidCentral. Please use version 2.2 or later – there are some problems with earlier versions that will affect the usability of this key.
Download the key
Once you have the Player installed, you will need to get a copy of the key you wish to play.

How to use this key Running the key
Install the Lucid Player This key has been built with the Lucid Builder and you need the Lucid Player installed on your computer to be able to use the key. The standard edition is a free download from LucidCentral. Please use version 2.2 or later – there are some problems with earlier versions that will affect the usability of this key. Download the key Once you have the Player installed, you will need to get a copy of the key you wish to play.

Solar Semidiurnal Tide (S2) chart

More details on the DOBIE Wave Gauge.

Technical Note No. 98/8 - Memory Management The following equations can be used to estimate memory endurance, which is the number of bursts that will fill the data memory.

Technical Note No. 98/9 - More Wave Statistics If OFFLOAD.DAT contains Task 4/0 (Wave Gauge - Wave Statistics) or Task 4/1 (Wave Gauge - Wave Statistics plus Hydrostatic Depth Spectrum) data, then the PEDP can be used to recompute the "basic" wave statistics and to compute an "extended" set of wave statistics.
Core statistics include mean water depth, standard deviation of the pressure signal, mean spectral period and spectral width. DOBIE computes these internally and they are written to OFFLOAD.DAT when data are downloaded.