Lect2_L6_L7_handout

Lect2_L6_L7_handout - lecture 2, Descriptive Statistics I...

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Unformatted text preview: lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Describing the shape of a Distribution stem-and-leaf display Frequency distribution and histogram Graphically Summarizing Qualitative Data Bar Charts and Pie Charts Describing central tendency Mean Median lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Example 1, A Shoe Store Case Suppose you decide to open an outdoor shoe-store for men. You have picked one brand and prepared enough money to stock your store with 1000 pairs of shoes. One question pop up in your mind: • “how should I allocate my money on different sizes?" (To make life easier, let’s forget about different styles, width, half sizes for this example. We use the U.S./Canada system: adult men’s shoe size ranges from 4 to 14.) Would you • Purchase 1000 pairs of size 9, because you were told that 9 is the average men’s shoe size? • Allocate money uniformly on all sizes (4-14)? lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Describing the shape of a Distribution stem-and-leaf display Frequency distribution and histogram Graphically Summarizing Qualitative Data Bar Charts and Pie Charts Describing central tendency Mean Median lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Example 1, A Shoe Store Case, ctd Suppose you just want to try and see what happens if you stock equal number of pairs for each size as a start. • What do you think would happen after a few weeks in business? Your desk of shoes: • What useful information can you get from this? lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Describing the shape of a Distribution stem-and-leaf display Frequency distribution and histogram Graphically Summarizing Qualitative Data Bar Charts and Pie Charts Describing central tendency Mean Median lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Example 1, A Shoe Store Case, ctd Let’s take another look at the pattern of shoe purchases for an idea of how shoe size is distributed in the population. • shape of the distribution • central tendency • variability lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Describing the shape of a Distribution stem-and-leaf display Frequency distribution and histogram Graphically Summarizing Qualitative Data Bar Charts and Pie Charts Describing central tendency Mean Median lecture 2, Descriptive Statistics I Describing the shape of a Distribution stem-and-leaf display Graphically Summarizing Quantitative Data • Often need to summarize and describe the shape of the distribution • One way is to use a stem-and-leaf display • Purpose is to see the overall pattern of the data, by grouping the data into classes • — the variation from class to class • — the amount of data in each class • — the distribution of the data within each class • Best for small to moderately sized data distributions lecture 2, Descriptive Statistics I Example 1, A Shoe Store Case Describing...
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This note was uploaded on 12/30/2009 for the course ISOM ISOM111 taught by Professor Anthonychan during the Fall '09 term at HKUST.

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Lect2_L6_L7_handout - lecture 2, Descriptive Statistics I...

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