What is Nominal Data
-In categories
What is Ordinal Data
- Data ranked in order
- The gaps between each ranking is unclear
What is Interval Data
-Measured on a fixed scale
When are Bar Charts used
- used when data is in discrete categories
- use for nominal data and all measures of central tendency
- bars must be separate
How are Pie Charts used
- need frequencies or populations that can be expressed as a fraction
- have to be confident that the data represents the whole population
- hard to compare
How are Histograms and Line Graphs used
- show pattern in a whole data set where this is continuous data
- can show the distribution of scores
- line graph has connected points instead of bars
What do Scatter Graphs show
-display the findings of correlational studies
What is Raw Data
- data collected from each participant
- no mathematical analysis on this data
What do Result Tables allow
- allow an overview of the data
- identify any outliers or anomolies which dont match the data
What should you do to estimate the mean
Assume the midpoint
What does ~ ~mean
Approximately equal to
What is Measures of Dispersion
- Gives an indication of how spread out the results within a data set are
- uses range, variance and standard deviation
What is the Range
- (Largest - Smallest +1)
- Scales measures gaps between points
- tells us how similar groups are
What is Variance
- How close on average people in the data set are to the mean
- smaller the number , the more similar the participants are
What is Standard Deviation
Tells us the average distance from each score from the mean
What does Larger Standard Deviation mean
Tells you that theres a bigger difference of people in the group
What does Smaller Standard Deviation mean
Tells you that they’re more similar
What should the mode be used in
Nominal data
What should the median be used in
Ordinal data
What should the mean be used in
Interval data
