Data Analysis: Graphs Flashcards
What are the types of ways to present and display quantitative data?
- Tables
- Bar charts
- Histograms
- Line graph
- Scattergram
What is a table?
- Raw score displayed in columns and rows
- Summary paragraph underneath to explain results
What is a bar chart?
- Categories (discrete data) placed along x-axis and frequency on y-axis
- Height of column represent frequency
What is a histogram?
- Bars touch each other
- Continuous data
- True zero
What is line graph?
Frequency on one axis, data on another is continuous
-Often shows change
What is a scattergram?
- Represent correlation analysis
- Each dot represent one pair of related data
- Axis must both be contentious
What are the two types of distributions?
- Normal
- Skewed
What are the two different types of skewed distributions?
- Negative skew
- Positive skew
What is normal distribution?
- Symmetrical, bell-shaped curve
- Mode, mean and median all occur at the midpoint of the curve
- Most people in the middle
What is a skewed distribution ?
Distribution leans to one side or the other because most people are either lower or upper end of distribution
Describe a negative skew:
- Most distribution is to the right side of the graph
- Long tail on the left
Out of mode, median and mean which has the highest peak in a negative skew?
Mode
Out of mode, median and mean which has the lowest peak in a negative skew?
Mean
Out of mode, median and mean which has the middle peak in a negative skew?
Median
Describe a positive skew:
- Most distribution leans left side of the graph
- Long tail on the right
