- StudyBlue
- Australia
- University of Technology, Sydney
- Mathematics
- Mathematics 35353
- A
- Lecture 1 : Review of Basic Statistics

Jacqui D.

Categorical Variable

A variable which names categories (whether with words or numerals)

Nominal Variable

A qualitative variable which can't be ordered (i.e. gender, eye color)

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Ordinal Variable

A qualitative/ categorical variable which has a logical ordering (i.e. grades, sizes etc.)

Discrete Variable

A variable that can not take on all values within the limits of the variable. (I.e. If you flip a coin 5 times you can get tails 4 times or 5 times but you can not have an observed value of 4.5)

Continuous Variable

A variable with infinite numbers of possible values between any two observed values (i.e. weight, as accuracy improves the number keeps changing infinitely)

Modal Category

The category which occurs most frequently

Mean

The sum of a set of scores in a distribution divided by the number of scores; usually the most representative measure of central tendency (Total/No. of scores)

Median

The number which occurs in the middle of the ordered list of observed numbers

What does a 95 confidence interval mean?

It means that 95 out of 100 times the confidence interval is expected to cover the true unknown mean

It refers to the confidence level on a t-distribution

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Standard deviation

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