Week 3 quiz_review_mini_tab_2011
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Week 3 Quiz Review 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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Review for the Week 3 Quiz.
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Week 3 Quiz Review
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.)
Week 3 Quiz Review
• Data Collection– Sampling– Census– Experiments– Simulations– Etc.
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.
Week 3 Quiz Review
• Know the difference between Qualitative and Quantitative Data
Week 3 Quiz Review
• Types of Sampling– Random– Stratified– Cluster– Systematic– Convenience
Week 3 Quiz Review
• Populations and Samples– Parameters and Statistics
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.
Week 3 Quiz Review
• Be able to get a regression equation.• Example– Data (4, 30), (4,35), (5,36), (6,42), (8,48)
Week 3 Quiz Review
• Be able to get a regression equation.• Example– Data (4, 30), (4,35), (5,36), (6,42), (8,48)
Week 3 Quiz Review
• Be able to get a regression equation.• Example– Data (4, 30), (4,35), (5,36), (6,42), (8,48)
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
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
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
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 Frequency0-7 9
8-15 1516-23 1224-31 3
Week 3 Quiz Review
• Class Width is 8
Number of Fish Frequency0-7 9
8-15 1516-23 1224-31 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)
Week 3 Quiz Review
• Midpoint of second class is 11.5
Number of Fish Frequency0-7 9
8-15 1516-23 1224-31 3
8+15 = 23 divided by 2 gives you 11.5
Week 3 Quiz Review
• What are the class boundaries of the third class? 15.5 and 23.5
Number of Fish Frequency0-7 9
8-15 1516-23 1224-31 3
Subtract .5 from the lower to get 15.5 and add .5 to the upper to get 23.5
Week 3 Quiz Review
• Give the relative frequency of all classes
Number of Fish Frequency Relative Frequency0-7 9 9/39
8-15 15 15/3916-23 12 12/3924-31 3 3/39
Total of 39
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.
