16. Graphs AO1 Flashcards
What is a table?
Raw scores displayed in columns and rows
What is a bar chart?
Height of columns represent the frequency of the item
Categories are usually placed along the x-axis and frequency on the y-axis
What is a histogram?
Bars touch each other - data is continuous rather than discrete
What is a line graph?
Frequency of on axis, data on the other axis is continuous, line oferten shows how something changes e.g. Over time
What is a scattergram?
Used for correlational analysis, each dot represents one pair of related data, data on both axis must be continuous
What is normal distribution?
Symmetrical
Bell-shaped curve.
Most people are in the middle area of the curve with very few at the ends
Mean, median and mode all occupy the same mid-point of the curve
What is skewed distribution?
Distributions that lean to one side or the other because most people are either at the lower or upper ends of distribution
What is a negative skew?
Most distribution is to the right of the graph
Mode is highest point of the peak, then median followed by mean
Give an example of why a negative skew would occur
A very easy test in which most people get high marks would produce a negative skew
What is a positive skew?
Most distribution is to the left of the graph
Mode is highest point of the peak, then median followed by mean
Give an example of why a positive skew would occur
A very difficult test in which most people get low marks would produce a positive skew
