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ISOM111 tutorial

# ISOM111 tutorial - ISMT 111 BUSINESS STATISTICS TUTORIAL 1...

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1 ISMT 111 B USINESS S TATISTICS T UTORIAL 1 created by Andrew Yam Types of Data § Qualitative/Categorical data a) Nominal Data - no natural order between the categories, e.g. gender b) Ordinal Data - order exists, e.g. size (S,M,L) § Quantitative/Numerical data a) Discrete data - e.g. number of people in a classroom b) Continuous data - e.g. height and weight Graphical Methods for describing data § Quantitative/Numerical data Example 1 Data set: 14 63 75 80 93 27 65 75 81 93 29 66 75 82 98 33 68 76 83 39 70 76 84 49 70 77 87 52 71 77 87 58 73 79 88 59 74 79 90 60 74 80 91 a) Histogram - appropriate for number of observation is large 100 90 80 70 60 50 40 30 20 10 15 10 5 0 X Frequency

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2 10 20 30 40 50 60 70 80 90 100 X b) Boxplot - available for identifying extreme values (outliers) - get the information of Minimum, Median, Maximum, Q1 and Q3 - describes the data and identifies extreme values or outliers Measures of Central Tendency § Mean Population Mean = = N i i
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ISOM111 tutorial - ISMT 111 BUSINESS STATISTICS TUTORIAL 1...

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