Workshop 2 - Measures of centrality

Question 1

Variable

Answer 1

Everything that is being measured, questioned or kept a record of in research is contained in variables.

Question 2

Nominal variable

Answer 2

Based on qualitative classification without any logical ranking. E.g. Colour - no inherent ranking

Question 3

Ordinal variable

Answer 3

Qualitative classification with a logical ranking. E.g. Weather alarms - 0 -> yellow -> orange -> red

Question 4

Interval variable

Answer 4

Measured on a numerical scale. Interval variables are continuous variables. Interval variables do not have an absolute zero. E.g. Sea level (negative sea level is also possible)

Question 5

Ratio variable

Answer 5

Measured on a numerical scale. Ratio variables are continuous variables. Ratio variables have an absolute 0. E.g. Height or weight

Question 6

Mode

Answer 6

The most common.

Count how many times each variable come up in your data set.

Question 7

Median

Answer 7

The middle value.

1. Order all the values from low to high
2. Count how many values there are
3. Split the number in two and round it up
4. Count from the beginning to the value from step 3 to find the middle value

Question 8

Mean

Answer 8

The average.

Add all of the numbers and divide them by the amount.

Question 9

Outlier

Answer 9

Something/someone which is very different compared to the rest of the group.