1What is the method for random sampling?
1. Number each member of a population.
2. Use a ramdom number generator to select a certain number of members for a sample.
2What is statified sampling? How is it done?
It is used to select a proportional sample form each strata (group).
1. $\frac{Sample.Size}{Population.Size}$ = proportion of each group.
2. Multiply by the number members in each group and round to the nearest integer.
3What sampling technique is this:
1. Find the interval size: $n = \frac{Population}{Sample}$
2. Use a random number as the starting position and then take every nth member for the sample.
Systematic Sampling
4What is primary data?
Primary data is data that you collect your self. Eg. from a survey that you did.
5What is secondary data?
Secondary data is what you collect from someone else's research. Eg. a website.
6What does qualitative mean in terms of statistical data?
Non-numerical data, it is based on qualities such as colour.
7What sort of data is quantitative?
Numerical data, that can be counted. Eg. age or distance.
8What is the difference between discrete and continuous data?
Discrete is exact values which can cannot be more specific, for example the number of pens in a pot. Continuous data is data which could always be more acurate, it is measurements which are rounded, such as your height.