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How do you work with interpret and prepare numerical data?
Understanding and interpret numerical data
How do you find the scale factor of a 2 dimensional figure?
You need information about a pre-image AND and image to work out a scale factor.
How do you work out the scale of a drawing?
Not all drawings are done to scale, sketches of buildings and people for instance. However if it is a technical drawing the draughtsman/woman will state on the drawing the scale used.
What are the main reasons for preparing a scale drawing?
A scale drawing makes it easier to visualize and work with objects of systems that are very large or very small. The key decision is determining the scale, i.e., the ratio between the dimensions of the object and the scale drawing.
How do you work out the index number?
Index numbers are usually expressed by setting some selected value as 100 and converting all other numbers to an index relative to that base.So, for a simple index, if the value y(0) is set to 100, then the index for the value y(k) is y(k)/y(0)*100.The calculations become more complicated if the index is for a collection of items. In such cases, a number of different "sub-indices" need to be combined together. The combined index is calculated as a weighted average of the component sub-indices, with the weights based on the importance of each su-index in the base period (base-weighted) or in the current period (current-weighted).
