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SOCC31H3 (19)

Lecture 2

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Shirin Montazer

SOCB06Lecture 2 September 20 2010Frequency DistributionRaw data is often difficult to synthesizeFrequency distribution of nominal data consists of two columns leftWhen distributions being compared are of unequal size o The frequency data cannot be used to make comparisons MethodsTwo popular methods are o Proportionof cases compared to the total size of distribution o Percentage the frequency per 100 cases percentage is used to show relative sideNominal data order doesnt matter and interval must be ordered Guidelines for Constructing Class IntervalsCategories must be mutually exclusive 156101115NOT 15510Designed to reveal or emphasize patternsPossible to have too few or too many groupsWhole numbers preferable to decimals Another way of constructing freq DistrThe following are the steps of constructing a freq Distr 1 Specify the number of class intervals 2 When all intervals are to be the same width the following rule may be used to find the required class interval width WLSK Where W class width L the largest data S the smallest data K number of classes Example suppose the age of a sample of 10 students are 20 18 18 21 19 25 22 23 23 and 22 We select K 4 and L25 and S18 W2518 divided by 4175 2 therefore W1719 2022 2325 2628
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