Stats Day 1 and 2 Notes
Stats Day 1 and 2 Notes 02260
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Popular in Mathematics (M)
This 2 page Class Notes was uploaded by Troi Foster on Friday September 4, 2015. The Class Notes belongs to 02260 at Rowan University taught by Bethany Gummo in Summer 2015. Since its upload, it has received 138 views. For similar materials see Statistics in Mathematics (M) at Rowan University.
Reviews for Stats Day 1 and 2 Notes
Clutch. So clutch. Thank you sooo much Troi!!! Thanks so much for your help! Needed it bad lol
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Date Created: 09/04/15
912015 Statistics a science of organizing displaying and analyzing data Sect 13 Data information coming from observations counts measurements or responses Datasets a population collection of all outcomesmeasurementscounts of interest b Sample subset of a population Parameter numerical description from population data Statistic numerical description from a sample Branches 1 Descriptive statistics that involve display organizing and summary of data Ex Pie chart 2 Inferential stats that involve using sample data to draw a conclusion about a population Sect 14 Variable a characteristic Whose value may change from observation to observation Types of data a qualitative nonnumerical ex Name b quantitative numerical ex Age Types of Random Variables a discrete values Which are countable typically Whole numbers Ex Number of students number of cars number of houses b continuous values can assume any numerical value over an interval Ex Height weight temperature money Sect 22 Sampling methods 1 Simple Random Sampling SRS consecutively number your population from 1 to total number Ex Out of 200 files want to rs 6 files Technology 193 200 6 7 13 97 2 Systematic pick every kth one ktotal in populationtotal want in sample 200633334 3 Cluster population is segmented into naturally occurring groups rs from some but not all Ex Polling voting 4 Stratified population is separated into naturally occurring groups rs some from each group 5 Convenience no real method biased sampling lbadnot sure you want to use Sect 21 Methods of data collection 1 Observational gathering data WO any treatmentinteractionin uence ex Toy companies 2 Experimental apply treatment and record ex Pharmacy 3 Simulation a physical or computer model used to see results 4 Survey investigation through verbal questions etc Sect 14 932015 Frequency Distribution a table that displays the possible categories and their corresponding frequency andor relative frequencies Frequency number of times the category appeared in the data Relative frequencyfreq in that categorytotal freq round to nearest thousandth EX rs10 students ask Which stats course ES S 1 S 1 S2 ES ES S 1 S2 S 1 S1 Stats Students Category Tally Freq Rel Frequency ES 111 3 3 10300 S1 11111 5 510500 S2 1 1 2 2 10200 Bar Chart categorical Bars do not touch Heights of barsIfrequency Paretoput categories in descending order highest bar to lowest bar
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