Week 3 quiz_review_mini_tab_2011
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This document provides a review of topics covered in a week 3 statistics quiz, including: - Descriptive and inferential statistics - Qualitative and quantitative data - Different types of sampling - Populations, samples, parameters, and statistics - Standard deviation, variance, and their relationship - Correlation coefficients - Identifying class width, midpoints, and boundaries in frequency tables - Calculating regression equations and using them to make predictions - Using the "Statcave" Facebook page for additional review materials
Week 3 quiz_review_mini_tab_2011
- 1. Week 3 Quiz ReviewB. Heard(These may not be copied, reproduced, or posted in an online classroom without my permission. Students may download one copy for personal use.)
- 2. Week 3 Quiz ReviewData CollectionSamplingCensusExperimentsSimulationsEtc.
- 3. Week 3 Quiz ReviewDescriptive & Inferential StatisticsKnow the differenceDescriptive - 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.
- 4. Week 3 Quiz ReviewKnow the difference between Qualitative and Quantitative Data
- 5. Week 3 Quiz ReviewTypes of SamplingRandomStratifiedClusterSystematicConvenience
- 6. Week 3 Quiz ReviewPopulations and SamplesParameters and Statistics
- 7. Week 3 Quiz ReviewStandard Deviation and VarianceHow to calculate and mathematical relationship.Variance is the Standard Deviation squared.Standard Deviation is the square root of the Variance.
- 8. Week 3 Quiz ReviewBe able to get a regression equation.ExampleData (4, 30), (4,35), (5,36), (6,42), (8,48)
- 9. Week 3 Quiz ReviewBe able to get a regression equation.ExampleData (4, 30), (4,35), (5,36), (6,42), (8,48)
- 10. Week 3 Quiz ReviewBe able to get a regression equation.ExampleData (4, 30), (4,35), (5,36), (6,42), (8,48)
- 11. Week 3 Quiz ReviewBe able to get a regression equation.ExampleData (4, 30), (4,35), (5,36), (6,42), (8,48)This would be written as y = 3.982x + 16.70
- 12. Week 3 Quiz ReviewUse a multiple regression equation.Plug and Chugy = -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
- 13. Week 3 Quiz ReviewCorrelation Coefficients, also noted as “r”Range from -1 to +1.75 to 1 is strong.5 to .75 is moderate.25 to .5 is weak0 to .25 is very weak (closer to zero, almost none)+ would be positive correlation, - would be negative correlationFor example, -0.58 would be moderate negative correlation
- 14. Week 3 Quiz ReviewIdentify Class WidthIdentify Midpoint of certain classesIdentify class boundariesGive the relative frequencyFishing Tournament Data below is an example
- 15. Week 3 Quiz ReviewClass Width is 8 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)
- 16. Week 3 Quiz ReviewMidpoint of second class is 11.58+15 = 23 divided by 2 gives you 11.5
- 17. Week 3 Quiz ReviewWhat are the class boundaries of the third class? 15.5 and 23.5Subtract .5 from the lower to get 15.5 and add .5 to the upper to get 23.5
- 18. Week 3 Quiz ReviewGive the relative frequency of all classes
- 19. Week 3 Quiz ReviewCome see me at the “Statcave”www.facebook.com/statcaveYou 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.