1/3/20112StatisticalM th d3MethodsDescriptiveStatisticsInferentialStatisticsSummarizes the data set collectedMake statements about populationDescriptive Statistics -describecollected data4“Nearly 87% of players participating in a Speed Training Program improved their sprint times.”“Only about 3% of players participating in a Speed Training Program had decreased times.”1.Involves•Collecting DataPresenting Data2550$••Characterizing Data2.Purpose•Describe DataX = 30.5 S2= 1130Q1Q2Q3Q4
1/3/20113Inferential Statistics - make generalizationsabout a group based on a subset(Sample) of that group5“Based on exit polls, more people voted for Candidate A.”1.Involves•Estimation•Hypothesis Testing2.Purpose•Make decisions about population characteristicsExperimental Unit – object of interest example – graduating senior, students in class 6096example graduating senior, students in class 609Population– the set of units we are interested in learning aboutexample – all 1450 graduating seniors at “State U”Sample– subset of populationexample – 100 graduating seniors at “State U”Variable – characteristic of an individual population unitexample – age at graduation
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1/3/20114Nominal level - data that is classified into categories and Interval level - similar to the ordinal level, with the additional tth t if l 7cannot be arranged in any particular order. EXAMPLES: eye color, gender, religious affiliation.Ordinal level – involves data arranged in some order, but the differences between data values cannot be determined or are property that meaningful amounts of differences between data values can be determined. There is no natural zero point. EXAMPLE: Temperature on the Fahrenheit scale.Ratio level - the interval level with an inherent zero starting point. Differences and ratios are meaningful for this level of meaningless. EXAMPLE: During a taste test of 4 soft drinks, Mellow Yellow was ranked number 1, Sprite number 2, Seven-up number 3, and Orange Crush number 4.measurement. EXAMPLES: Monthly income of surgeons, or distance traveled by manufacturer’s representatives per month.8