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9 Cards in this Set

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What is a statistical model?

A statistical model is a simplification of a real world situation.


It can be used to make predictions on a real world problem.


Statistical models can be analysed and refined, to give a truer picture.

What are the advantages of using statistical models?

The model is quick and easy to produce.


The model helps our understanding of the real world problem.


Helps us make predictions.

What are the disadvantages of using statistical models?

The model simplifies the real world situation, and only describes a part of the real world problem.




The model may only work for a range of values.

What is a continuous variable? Give examples

A continuous variable can take any value within a given range.




For example, time, height.

What is a discrete variable? Give examples.

A discrete variable can only take certain values within a particular range.




For example, shoe size, number of coins.

What is a frequency distribution?

A frequency table.




A list of discrete values and their frequencies.

Describe the advantages and disadvantages of using the mean.

Mean is a good average because you use all your data values in it.


Mean isn't good because it is heavily affected by extreme values.


Mean only works for quantitative data.

Describe the advantages and disadvantages of using the median.

The median isn't affected by extreme values, meaning it is good to use when you have outliers.


Median is good to use when the data is non symmetric.

Describe the advantages and disadvantages of using the mode.

The mode can be used with qualitative data.


Some data sets have more than one mode.