Presentation of quantitative data Flashcards
When would we use a bar chart?
When data is divided into categories. Discrete data. Bars are needed to denote that we are dealing with separate conditions.
What is a bar chart?
A type of graph in which the frequency of each variable is represented by the height of the bars.
What is a histogram?
A type of graph which shows frequency but the area of the bars represents the frequency.
Difference between bar chart and histogram lay out.
Bar chart- discrete data
Histogram- continuous data
Bar chart- bars seperate
Historgram- bars touching
What is a scattergram?
A type of graph which represents the strength and direction of the relationship between co-variables.
What are the two types of distributions?
Normal
Skewed
What is a normal distribution?
A symmetrical spread of frequency data that forms a bell-shaped pattern. The mean, median and mode are all located at the highest peak and very few scores are found on the extreme ends.
What is a skewed distribution?
A spread of frequency data that is not symmetrical and the data clusters to one end.
What is a positive skew?
Where most of the distribution is concentrated towards the left of the graph, resulting in a tail on the right.
What will be at the peak of a skewed distribution curve?
Mode
What is a negative skew?
The tail is on the negative (left) side of the peak and most distribution is concentrated on the right.
