Type of Data
Dot Plot
Categorical or Discrete Quantitative
Outlier
What is it, how to you identify it, and what type of display needs us to do this?
Calculate fences, an outlier is data outside the fence. Needed for Box Plots. (whisker does NOT connect to the outlier.
Given Relative frequency 26%, and n = 35, Find the number of data items for this section of a pie chart.
9.1
Formula for Upper Fence
UF = Q3 + 1.5(IQR)
dot plot, line graph, bar graph, stem & leaf
Bar Graph
Categorical
What is this called?
1 | 3 | 4 = 31 and 34 boxes sold
Say what it is called, and what type of display it is used with.
The key for a stem and leaf plot displaying number of boxes sold for two groups of data.
6. 7, 8, 10, 14
Find Quartile 1
7
Formula for Relative Frequency
pct = (part/whole) * 100
or Rel Freq = (freq/n) * 100
All display types where no y-axis is needed
Histogram
Continuous Quantitative
Time
5, 6 ,7, 10, 142
What are the stems?
0, 1 and 14
Formula for Range
Range = max - min
All display types where Relative Frequency makes no sense
Stem & Leaf
Discrete quantitative
Interval.
What is it, how do you calculate it, and what type of display does it go with?
A range of quantitative data values used with Histogram
5, 6, 7, 10, 142
Find the Interquartile Range (IQR)
60.5
Formula for IQR
IQR = Q3 - Q1
Put data in ascending order. Identify the middle two data items, and average them.
Box & Whiskers (or Box Plot)
Quantitative
Describe the Five Number Summary, in order
Min, Quartile 1, Median (or Q2), Quartile 3, Max
5, 6, 7, 10, 142
Calculate the Upper Fence
166.75
Formula for Lower Fence
LF = Q1 - 1.5(IQR)
When data is skewed right, which measure of center is furthest to the left?
Mode