Stats Day 5
Chapter 3 review
Do Now
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ACT
Homework Questions
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Do you have questions on the hw?
Marginal and Conditional
Distributions
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Marginal distributions: the sum totals in the table
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Conditional distribution: sub-population
What is the marginal
frequency distribution of
the positions’ actual
counts?
96 centers, 94 power
forwards, 85 point guards, 71
small forwards and 99
shooting guards.
What is the conditional
relative frequency
distribution of the US
college positions’ actual
counts?
354/445 US college players
65/354 centers
76/354 power forwards…
To know for quiz…
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5W’s + H
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Who: the subjects being studied (not the ones
conducting the study)
What: the variables. What are you studying
about the subject?
Why: why is the study happening? (the ones
conducting the study may factor in)
Categorical vs Quantitative
• Tables and Graphs
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Reading graphs/charts and finding relative frequency
Independence
Marginal distribution
Conditional distribution
Poster Presentations
Chapter 3 summary
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Use the class data to analyze class trends
Note: you may need to change quantitative data to categorical data
by grouping
Create an easy to follow poster with a partner with the
following categorical data displays:
1) Relative frequency table (with count and %)
2) Bar chart
3) Pie chart
4) Contingency table (choose something interesting)
5) Segmented bar chart
6) a sentence about the contingency table/segmented bar chart
describing the trend and association of the variables (independence)
7) a sentence describing a marginal distribution and a conditional
distribution
Label graphs appropriately!
Homework
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Study for Quiz
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Study tools:
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Smoking and education worksheet
Chapter 2 #15, 17
Chapter 3 #21, 25
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USE THE ODDS IN THE BACK TO CHECK YOUR ANSWER
To know for quiz…
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5W’s + H
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•
•
Who: the subjects being studied (not the ones
conducting the study)
What: the variables. What are you studying about the
subject?
Why: why is the study happening? (the ones conducting
the study may factor in)
Categorical vs Quantitative
• Tables and Graphs
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•
Reading graphs/charts and finding relative frequency
Independence
• Marginal and Conditional distribution
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Issues with Graphs
Area Principle- be careful not to
misrepresent
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-the area should be proportional
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Issues with Graphs
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Simpson’s Paradox:
a misrepresentation of averages- when the
combined average shows a different trend
than the individualized groups of data
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Teacher
(Mr Selan)
(Ms Shein)
Test 1 Score
/50=
/100=
Test 2 Score
/200=
/20=
Total(%)
Simpson’s Rules Examples
More examples