ENGR131_FA10_Purzer_4a

ENGR131_FA10_Purzer_4a - 4A Click to edit Master subtitle...

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Click to edit Master subtitle style 4/24/11 ENGR131 Transforming Ideas to Prof. Purzer & GTA Masaki Kakoi Section 002 11 4A
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4/24/11 Excel Review See 3B slides 22
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4/24/11 Goals for today 33 DESIGN CAREER MODEL PROFESSIONAL HABITS Effective communication involves modeling Engineers use statist ics to “ m odel” problem and solutions
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4/24/11 Project Milestone Survey 44
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4/24/11 Getting started ± In your team, discuss: “A team working at a beverage can (soda, beer, fruit juice) manufacturing company identified that many cans were coated with more lacquer than required. This team needs to optimize the lacquer coating process.” 55 Lacquer : clear coating sprayed inside of cans to maintain product taste and prevent product leakage due to corrosion.
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4/24/11 Six Sigma Methodology Measure (gather right data) Analyze (use statistical tools to identify the root of a problem) Improve (correct the problem, not the symptoms) Control (put a plan in place) Tannenbaum, K. (2003). Applying Six Sigma Methodology to Energy-Saving Projects. Retrieved on September 13, 2010 from http://texasiof.ces.utexas.edu/ texasshowcase/pdfs/casestudies/cs_dow_sixsigma.pdf 66
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4/24/11 Why learn statistics? Goal Make a compelling argument It is not enough just to have a logical conclusion Different perspectives often have different logic It is not enough just to have data Is it “good” data? Need & Trustworthy data and chain of
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4/24/11 Descriptive Statistics 3 measures of central tendency median, mode, mean 0 2 4 6 8 10 12 Histogram: Children in a Sample of US Households Number of Children in Household Frequency
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4/24/11 Descriptive Statistics Median: midpoint ” or “middle score” Odd number of entries = middle value of a sorted data set For even number of entries = average of the Mode: The most frequently occurring value in a data set (e.g., frequency distribution) For data that is “normally distributed”, mean = median = mode
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4/24/11 Descriptive Statistics Mean: In Excel, “average” = “mean” FYI – “mean” and “average” are not always synonymous Arithmetic mean = Sum of the observations divided by the number of observations What does this look like as a formula ?
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4/24/11 Notation for Mean Mathematically: What would this look like in EXCEL? See page 169 in Preliminary Edition Obj10 Mean, “x-bar”
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4/24/11 Team exercise: Calculating mean & median (5 minutes) Calculate the median and mean for the following set of data: 4, 4,10 ,8 ,6, 12, 16 l What happens to the median and mean if the last number (16) is replaced by 86?
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ENGR131_FA10_Purzer_4a - 4A Click to edit Master subtitle...

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