Ch 1 and 2 Powerpoint - Chapter 1 and 2 WinnieLi BA 240...

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July 28, 2011 BA 240 -- Winnie Li 1 BA 240 Statistical Analysis Chapter 1 and 2 Winnie Li
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July 28, 2011 BA 240 -- Winnie Li 2 Chapter 1:  Statistics, Data,  and Statistical Thinking The Science of Statistics Fundamental Elements of Statistics Types of Data Collecting Data
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July 28, 2011 BA 240 -- Winnie Li 3 What is the average age of a student at BCC? What is the gender breakdown at BCC? What is the ethnic breakdown of the student population of BCC? What are Statistics? Get a piece of paper, and write down your answers. THINK carefully when you’re “guessing” the numbers … WHY do you pop up with these numbers? Finally, click on the information icon to view the fact sheet and to compare your answers.
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July 28, 2011 BA 240 -- Winnie Li 4 What is the gender breakdown of King County? What is the typical age of a King County resident? What is the ethnic makeup of King County? What is the typical income of King County? What are Statistics? – Con’t On the same piece of paper, write down your answers for the following questions.
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July 28, 2011 BA 240 -- Winnie Li 5 What is the gender breakdown of Americans? What is typical age of an American? What is the ethnic breakdown? What is the typical income of an American household? Go to www.census.gov What are Statistics? – Con’t On the same piece of paper, write down your answers for the following questions. Then, click on the “go” icon to view the fact sheet and to compare your answers. Finally, compare your answers with the previous two slides, were the numbers the same, or different? Why? Any relationship between them?
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July 28, 2011 BA 240 -- Winnie Li 6 The science of data It involves Collecting Classifying Summarizing Organizing Analyzing Interpreting Statistics is…
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July 28, 2011 BA 240 -- Winnie Li 7 Population Vs. Sample Population When you measure everyone you are conducting a census . Sample When you select a few from the population, you have a sample. A characteristic you’re measuring Variable Random Sample Every value in the population has an equal chance of being selected.
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July 28, 2011 BA 240 -- Winnie Li 8 Suppose we want to measure the average starting salary of a new graduate from UW to the nearest dollar. Because it is too time-consuming, we randomly chose 50 new graduates. Describe the population. Describe the sample. Describe the variable of interests. Example: Starting Salary ALL new graduate from UW. 50 RANDOMLY CHOSEN new graduate from UW. Starting Salary (in $) Notes: Population means EVERYONE, so you need to start with this magic word – ALL.
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July 28, 2011 BA 240 -- Winnie Li 9 Descriptive Vs. Inferential Descriptive Statistics - Description and summarization of data (i.e., Chapter 2) Inferential Statistics - Uses sample of measurements to make generalizations (inferences) about a population (i.e, Chapter 7)
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July 28, 2011 BA 240 -- Winnie Li 10 Types of Data Quantitative Data: Ratio: Interval: Qualitative Data: Ordinal: Nominal: Involves with Numbers Ratios of the values are meaningful.
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