Frequency

Frequency - A frequency distribution polygon Α bar graph Different shapes of distribution According to the poll conducted March 18-20 2005 when

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Organizing Data: Frequency Distribution of Scores Frequency distribution= organized tabulation of scores & the count of the individuals that obtained them it could be presented in the form of a table or a graph

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Ungrouped Frequency Distribution Data Set: 2, 7, 10, 5, 5, 3, 9, 12, 5, 8, 2, 4, 7, 6, 10, 7, 3, 9, 7, 12, 4, 6, 3, 1, 8. N= total number of observations= 25 Total f =total frequency =25 Σ f=N
f = frequency p = proportion % = percentage p = f/N % = p*100 = f/N * 100

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Score (X) f p % 12 2 .08 8 11 0 .00 0 10 2 .08 8 9 2 .08 8 8 2 .08 8 7 4 .16 16 6 2 .08 8 5 3 .12 12 4 2 .08 8 3 3 .12 12 2 2 .08 8 1 1 .04 4 Ν= 2 5
Grouped Frequency Distribution N=25 Interval f p % 11 - 15 2 .08 8 6 - 10 12 .48 48 1 - 5 11 .44 44 Width of intervals = 5 points

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CONSTRUCTING GROUPED FREQUENCY TABLE find the range of results in the data set (range = highest - lowest +1) decide on the width/number of intervals (choose a simple number for the width) each interval should start or end with a score that is a multiple of the interval width all intervals should be the same width
A frequency distribution histogram

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Unformatted text preview: A frequency distribution polygon Α bar graph Different shapes of distribution According to the poll, conducted March 18-20, 2005 when asked if they "agree with the court's decision to have the feeding tube removed," (Schiavo’s case) 62 % of Democratic respondents agreed, compared to 54 % of Republicans, and 54 % of Independents. These results were displayed along a very narrow scale of 10 percentage points, and thus appeared to show a large gap between Democrats and Republicans/Independents Laid out in this manner, the graph suggests that the gap between the two groups is overwhelming, rather than only 8 percentage points, within the poll's margin of error of +/- 7 percentage points. Also, this presentation obscures the poll's finding that majorities of all the groups sampled approved of the removal of Schiavo's feeding tube. A more accurate presentation of the poll's findings would have looked like this...
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This note was uploaded on 11/12/2009 for the course PSY 3301 taught by Professor Staff during the Fall '08 term at Texas State.

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Frequency - A frequency distribution polygon Α bar graph Different shapes of distribution According to the poll conducted March 18-20 2005 when

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