Download - Week3lecturemath221 120117081125-phpapp02
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Week 3 Quiz Review for Math 221
B. Heard(These may not be copied, reproduced, or posted in an online classroom without my
permission. Students may download one copy for personal use.)
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Week 3 Quiz Review
• Data Collection
– Sampling
– Census
– Experiments
– Simulations
– Etc.
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Week 3 Quiz Review
• Descriptive & Inferential Statistics
– Know the difference
– Descriptive - This is a set of methods to describe data that we have collected.
– Inferential - This is a set of methods used to make a generalization, estimate, prediction or decision.
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Week 3 Quiz Review
• Know the difference between Qualitative and Quantitative Data
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Week 3 Quiz Review
• Types of Sampling
– Random
– Stratified
– Cluster
– Systematic
– Convenience
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Week 3 Quiz Review
• Populations and Samples
– Parameters and Statistics
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Week 3 Quiz Review
• Standard Deviation and Variance
– How to calculate and mathematical relationship.
– Variance is the Standard Deviation squared.
– Standard Deviation is the square root of the Variance.
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Week 3 Quiz Review
• Be able to get a regression equation.
• Example
– Data (4, 30), (4,35), (5,36), (6,42), (8,48)
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Week 3 Quiz Review
• Be able to get a regression equation.
• Example
– Data (4, 30), (4,35), (5,36), (6,42), (8,48)
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Week 3 Quiz Review
• Be able to get a regression equation.
• Example
– Data (4, 30), (4,35), (5,36), (6,42), (8,48)
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Week 3 Quiz Review
• Be able to get a regression equation.
• Example
– Data (4, 30), (4,35), (5,36), (6,42), (8,48)
This would be written as y = 3.982x + 16.70
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Week 3 Quiz Review
• Use a multiple regression equation.
• Plug and Chug
• y = -6.5 +12a + 5.1 b where a is test score and b is a competency score. y predicts the person’s score on a job test.
• Predict a job test score for a person who made a 50 on the test and got a 7 as a competency score.
• y = -6.5 +12(50) + 5.1 (7)
• Y = 629.2
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Week 3 Quiz Review
• Correlation Coefficients, also noted as “r”• Range from -1 to +1
• .75 to 1 is strong
• .5 to .75 is moderate
• .25 to .5 is weak
• 0 to .25 is very weak (closer to zero, almost none)
• + would be positive correlation, - would be negative correlation
• For example, -0.58 would be moderate negative correlation
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Week 3 Quiz Review
• Be able to create a stem and leaf plot and determine descriptive statistics.• Mean
• Median
• Mode
• Range
• Variance
• Standard Deviation
• Use Minitab!
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Week 3 Quiz Review
• Identify Class Width• Identify Midpoint of certain classes• Identify class boundaries• Give the relative frequency• Fishing Tournament Data below is an example
Number of Fish Frequency
0-7 9
8-15 15
16-23 12
24-31 3
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Week 3 Quiz Review
• Class Width is 8
Number of Fish Frequency
0-7 9
8-15 15
16-23 12
24-31 3
8-0 = 8, or you could havesaid 15 – 7 = 8, or counton your fingers, 0,1,2,3,4,5,6,7(There are eight numbers,don’t let it fool you)
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Week 3 Quiz Review
• Midpoint of second class is 11.5
Number of Fish Frequency
0-7 9
8-15 15
16-23 12
24-31 3
8+15 = 23 divided by 2 gives you 11.5
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Week 3 Quiz Review
• What are the class boundaries of the third class? 15.5 and 23.5
Number of Fish Frequency
0-7 9
8-15 15
16-23 12
24-31 3Subtract .5 from the lower to get 15.5 and add .5 to the upper to get 23.5
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Week 3 Quiz Review
• Give the relative frequency of all classes
Number of Fish Frequency Relative Frequency
0-7 9 9/39
8-15 15 15/39
16-23 12 12/39
24-31 3 3/39
Total of 39
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Week 3 Quiz Review
• Come see me at the “Statcave”
• www.facebook.com/statcave
• You DO NOT have to be a Facebook person to see these.
• If you are, become a fan.
• IT IS NOT REQUIRED TO BE ON FACEBOOK. IT’S SOMETHING I DO FOR FUN.
• I post charts there because it is easy for me to do.