Statistics for Psychology: A Beginner's Guide
Your Turn Answers
Define these key terms
1. Latent variable: a variable that we didn’t measure but infer from our data
2. Mean: the average value, calculated as the sum of the values divided by n
3. Standard deviation: the spread of values, calculated as the square root of the sum of the squared deviations divided by n
Fill in the gaps
1. The median is the middle value in an ordinal data set.
2. The inter-quartile range can be used to measure dispersion in an ordinal variable.
3. The measure of central tendency for a categorical variable is the mode.
Identify the variable type for each of the variables
Variable |
Method |
Type of Measurement Interval/Categorical/Ordinal |
Happiness |
Self-rated report using a Likert scale |
Ordinal |
Dog |
Organized by breed |
Categorical |
Height |
Scale in centimetres |
Interval |
Weather |
mm of rainfall |
Interval |
Caffeine status |
Measurements taken before and after drinking coffee |
Categorical |
Social media |
Hours spent on social media |
Interval |
Pain |
Self-rated using a low-high set of options |
Ordinal |
Top level of education |
Categorizing from primary school through to postgraduate |
Ordinal |