HW 1 Exemplars

# HW 1 Exemplars - Exemplars for the Homework Problems from...

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Exemplars for the Homework Problems from Chapter 2 Required for Homework #1 Section 2.1, Problem 7. What is the population being sampled? ANS: All customers of the steakhouse. What is the variable of interest? ANS: Food quality rating, rated on a 5 degree scale from poor (P) to outstanding (O). What is the sample? ANS: 50 patrons. Data type? ANS: Qualitative and ordinal. Counts (= frequencies) and percentages per rating: Rating Frequency Relative Frequency Outstanding 19 0.38 Very Good 13 0.26 Good 10 0.20 Average 6 0.12 Poor 2 0.04 50 1.00 “Outstanding” is the “modal class” because it has the highest count and highest percentage. Sketch the following bar chart: 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 Outstanding Very Good Good Average Poor Food Qality Rating Percentage HW #1/Chap 2 exemplars 1 © 2009 Harvey Singer

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“Outstanding” is the “modal class” because it is the tallest bar in the bar chart. (In this “distribution,” the tallest box is on the left and the boxes continually decrease in height to the left. This is an example of a “left-skewed” distribution.) CONCLUSION FROM SAMPLE: Outstanding is the most popular (= preferred) rating, with the highest percentage of 38%. INFERENCE FROM SAMPLE: Overall and in general (for the population of all
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## This note was uploaded on 02/19/2011 for the course OM 210 taught by Professor Singer during the Spring '08 term at George Mason.

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HW 1 Exemplars - Exemplars for the Homework Problems from...

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