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Mathss Essay

  • Submitted by: raskyjoseph
  • on September 19, 2012
  • Category: Miscellaneous
  • Length: 1,662 words

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Below is an essay on "Mathss" from Anti Essays, your source for research papers, essays, and term paper examples.

Graphical presentation of data and measures of central tendency
LECTU RE 2

Introduction
 Summaries of data are presented in the results

section of reports, either in graphs, tables.
 The presentation method used depends on the data

and the objectives of your study.
 Graphs are usually labeled and figures and both

graphs and tables are numbered

Introduction
 When deciding on how to present data, illustrate the most

interesting or important results (aspects of your report which you want your reader to focus on)

 Avoid having too many pages of graphs or one table after

another

 Both figures and tables should always have appropriate (brief)

title and be labeled so that they stand alone

 When displaying your graphs and tables, always report your

summary statistics e.g. mean values, n, and one of the measures of dispersion; SD, Variance, or 95% confidence interval

Frequency Table
 A table with one column listing events categories or

values of the variable (x) and the other column listing their respective frequencies (f) or the number of times the values occur  Consider the following data for the levels of sulphur dioxide in the rainfall (ml/litre of rainwater): 0.7; 0.9; 0.9; 0.7; 0.8; 0.7; 1.0; 0.8; 0.8; 0.9; 0.7; 1.2; 0.6; 0.5; 0.8; 1.0; 1.0; 0.8; 0.6; 0.8  ∑f =n = 20

Frequency table
x 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 f 1 2 4 6 3 3 0 1

Frequency table
 Where the data may be a large number of values,

display data in classes of equal sizes e.g. 0.40-0.49; 0.50-0.59; 0.60-0.69 etc. This is called group frequency distribution
 Number of classes (Generally recommended to use

5-20 classes)
 Width of classes: Related to number of classes

Approx. class width = [Largest Data value- Smallest ]/Number of classes

Frequency table
 May reveal the following:

 The range of frequencies observed  Approximately where most points lie
 Variability among frequencies- do all values listed in...

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  • Submitted by: raskyjoseph
  • on September 19, 2012
  • Category: Miscellaneous
  • Length: 1,662 words
  • Views: 162
  • Popularity Rank: 533758
  • 1 rating(s)

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