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Intro to Stats Exam 1 SLCC Questions and Answers
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Intro to Stats Exam 1 SLCC Questions and Answers
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Intro to Stats Exam 1 SLCC Questionsand Answers
Coefficent iiof iiVariation ii(CV) ii- iiAnswers ii-Ratio iiof iithe iistandard iideviation iito iithe
iimean iiof iidata iiset
Std. iidev ii/ iimean ii
Higher iiCV ii= iimore iispread
When iiconverting iiunits iiof iimeasure, iithe iiCV iiis iiunchanged
Statcrunch ii= iicoef iiof iivar ii(displayed iias iipercentage, iidon't iiforget iito iidivide iiby ii100)
Empirical iiRule ii- iiAnswers ii-For iibell-curve iidata
68% iiof iidata iiwithin ii1 iistd iidev
95% iiwithin ii2 iistd iidev ii
99.7% iiwithin ii3 iistd iidev
sample iistandard iideviation ii- iiAnswers ii-s
Statcrunch ii= iistd iidev
population iistandard iideviation ii- iiAnswers ii-σ ii(sigma)
Statcrunch ii= iiunadj. iistd. iidev
Random iisampling ii- iiAnswers ii-a iisample iithat iifairly iirepresents iia iipopulation iibecause
iieach iimember iihas iian iiequal iichance iiof iiinclusion
ex: iipull ii#'s iiout iiof iihat
Systematic iisampling ii- iiAnswers ii-randomly iiselect iisome iistarting iipoint iiand iithen
iiselect iievery iikth iielement iiin iithe iipopulation
ex: ii5th iicustomer iito iicome iiout iiof iistore iiand iithen iievery ii7th iiafter iithat.
stratified iisampling ii- iiAnswers ii-A iitype iiof iiprobability iisampling iiin iiwhich iithe
iipopulation iiis iidivided iiinto iigroups iiwith iia iicommon iiattribute iiand iia iirandom iisample
iiis iichosen iiwithin iieach iigroup
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