Outliers can be marked with an * instead of being used as the minimum or maximum number.
Background
Thursday, April 16, 2015
Friday, April 10, 2015
Shape of Distributions
You can use dot plots and histograms to identify shapes of distributions
By recognizing the shape of distribution, you can better choose an appropriate measure of the data.
Thursday, April 9, 2015
Histograms
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Wednesday, April 8, 2015
Steam-and-Leaf Plot
5, 8, 12, 30, 32, 48, 49
A stem-and-leaf plot uses the digits of data values to organize a data set. Each data value is broken into a stem and a leaf.
A stem and leaf plot shows how data are distributed.
Thursday, March 26, 2015
Mean Absolute Deviation - M.A.D.
Finding the Mean Absolute Deviation (MAD)
Step 1: Find the mean of the data.
Step 2: Find the distance between each data value and the mean.
Step 3: Find the sum of the distances in Step 2.
Step 4: Divide the sum in Step 3 by the total number of data values.
Tuesday, March 24, 2015
Quartiles and Interquartile Range
- Order the Data from least to greatest
- Find the median
- Split the data in half, lower half and upper half
- First Quartile- Find the median of the lower half
- Third Quartile - Find the median of the upper half
- The interquartile range- Take the third quartile and subtract the first quartile
**Quartiles show the spread of data
Range
Class Song for Range:
Home Home on the Range,
Take the High and subtract the Low
The data is spread
a variation you see
Now, you are all as smart as me
Team one range: 78-72 = 6
Team two range: 84-67= 17
Team one has a difference of 6 inches between their players.
Team two has a difference of 17 inches between their players.
Monday, March 23, 2015
Median and Mode
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Mode is 6
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There can be many modes or No modes!!!!!!
- - - - - - - - - - - - - - - - - - - - - - - - - - -
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If there are 2 numbers in the middle
Add the two numbers together
and divide by 2
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Wednesday, March 18, 2015
Mean
64 + 77 + 79 + 80 + 84 + 86 + 90 + 90 + 94 + 96 + 97 + 98 =1035
1035 divided by 12 = 86.25
Compare two means
Team 1: 72 + 73 + 76 + 76 + 78 = 375
375 divided by 5 = 75 inches
Team 2: 67 + 72 + 76 + 76 + 84 = 375
375 divided by 5 = 75 inches
The two teams have the same mean!
Outlier affects the mean
Mean with the outliers: 35
Mean without the outliers: 25
With the outlier, the mean is a lot higher than without the outlier.
The mean is best represented without the outlier.
Friday, March 6, 2015
Dot Plots/ Line Plots
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Distribution of Data
Cluster- where several data points are together
Gap- an interval with no data
Peak- data value that occurs most often
Outlier- One data point by itself, away from the cluster
**** You can have zero, one, or more clusters, peaks, or gaps
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