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Unformatted text preview: 1 What is Statistics? the science of collecting, organizing, and analyzing data the mathematics of the collection, organization and interpretation of numerical data The branch of mathematics which is the study of the methods of collecting and analyzing data a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters 2 What is Statistics? Statistics is a discipline which is concerned with: designing experiments and other data collection, summarizing information to aid understanding, drawing conclusions from data, and estimating the present or predicting the future. 3 What is Statistics? "I like to think of statistics as the science of learning from data ...." Jon Kettenring, ASA President, 1997 Steps of statistical analysis involve: collecting information ( Data Collection ) evaluating the information ( Data Analysis ) drawing conclusions ( Statistical Inference ) 4 What is Statistics? Statistics: two different meanings: IN PLURAL SENSE: STATISTICIS MEANS A SET OF OBSERVATIONS, USUALLY COLLECTED BY MEASUREMENTS OR COUNTING,COLLECTIVELY KNOWN AS DATA. IN SINGULAR SENSE: STATISITICS REFERS TO A GROUP OF SCIENTIFIC METHODS USED TO * collecting data * interpreting and analyzing data * making conclusions or inferences. 5 TYPES OF STATISTICS 1. DESCRITPIVE STATISTICS 2. INFERENTIAL STATISITCS STATISTICS REQUIRES SIX PROCEDURES UNDERSTANDING ANALYZING PLANNING EXECUTING CHECKING REPORTING 6 CHAPTER 2 DATA – SYTEMATICALLY RECORDED INFORMATION, WHETHER NUMBERS OR LABELS, TOGETHER WITH ITS CONTEXT . CONTEXT TELLS WHO WHAT WHEN WHERE HOW WHY IS BEING MEASURED. 7 CONTEXT WHO: INDIVIDUALS ABOUT WHOM DATA ARE COLLECTED ( PARTICIPANTS, RESPONDENTS , SUBJECTS, EXPERIMENTAL UNITS, RECORDS CASES WHAT: CHARACTERISTICS RECORDED ABOUT EACH INDIVIDUAL ( VARIABLES ) WHEN: TIME HOW: METHOD OF COLLECTING DATA WHERE: PLACE WHY: PURPOSE OF STUDY 8 EXAMPLE IN JUNE 2000, A HOMEOWNER IN TUSCOLA, ILLINOIS, WANTED TO DETERMINE IF GENERIC FERTILIZER AND WEED KILLER IS AS EFFECTIVE AS THE MORE EXPENSIVE BRAND NAME PRODUCT. AFTER THE SPRING RAINS AND EARLY SUMMER WARMTH, HE COUNTED THE NUMBER OF WEEDS AND DENSITY OF GRASS BLADES. IDENTIFY WHO, WHERE, WHEN , AND WHY FOR THE SITUATION DESCRIBED. A. A HOMEOWNER; TUSCOLA, ILLINOIS, JUNE 2000, COMPARE PRODUCTS. B. TWO PATCHES OF LAWN; TUSCOLA, ILLINOIS; JUNE 2001; COMPARE PRODUCTS. C. TWO PATCHES OF LAWN; ARCOLA, ILLINOIS; JUNE 2000; COMPARE PRODUCTS. D. A HOMEOWNER; ARCOLA, ILLINOIS; JUNE 2000; COMPARE PRODUCTS....
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 Spring '08
 dikong
 Standard Deviation, Frequency, Frequency distribution, Histogram

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