mc 3018 stats

# mc 3018 stats - ANDTHENORMALCURVE WHATARESTATISTICS...

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BASIC DESCRIPTIVE STATISTICS  AND THE NORMAL CURVE MC3018 Foundations of Media Research

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WHAT ARE STATISTICS? MC3018 Foundations of Media 2 Statistics are mathematical procedures for organizing, summarizing and analyzing data. Statistics make use of sets of procedures to organize data and make inferences from data. Statistics provide valid and reliable results when the data collection and research methods follow established scientific procedures.
MAJOR CATEGORIES OF STATISTICS I. Descriptive Statistics – used to summarize responses from a sample and to characterize what is most “typical.” II. Inferential Statistics – used to make inferences/predictions from the sample to the larger population. 3 MC3018 Foundations of Media

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DESCRIPTIVE STATISTICS MC3018 Foundations of Media 4 A. Distributions B. Measures of Central Tendency 1. Mode 2. Mean 3. Median C. Measures of Variability or Dispersion 1. Range 2. Variance 3. Standard Deviation D. Measures of Association (descriptive and inferential)
THE “VOCABULARY” OF STATISTICS MC3018 Foundations of Media 5 X (x) = a variable that can take many values: if x = age in years, x = 1  100+ Y (y) = a second variable N = total number of subjects n = number of subjects in a group within N Sigma = add everything up =

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THE VOCABULARY OF STATISTICS MC3018 Foundations of Media 6 = Sample Mean Value for variable X So, what’s this?
FREQUENCY DISTRIBUTION  Religion 15 12.8 13.0 13.0 37 31.6 32.2 45.2 2 1.7 1.7 47.0 33 28.2 28.7 75.7 28 23.9 24.3 100.0 115 98.3 100.0 2 1.7 117 100.0 Protestant Catholic Mormon/Latter Day Saints Christian (no denomination) None Total Valid System Missing Total Frequency Percent Valid Percent Cumulative Percent Frequency Distribution: A table of the scores for a variable ordered according to magnitude and frequency of occurrence.

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FREQUENCY  DISTRIBUTION: BAR CHART Religion Religion None Christian (no denomi Mormon/Latter Day Sa Catholic Protestant Frequency 40 30 20 10 0
FREQUENCY DISTRIBUTION MC3018 Foundations of Media 9 A frequency distribution is a good first step when looking for patterns in your data – but not sufficient.

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MEASURES OF CENTRAL TENDENCY MC3018 Foundations of Media 10 Statistic: An index summarizing a major property or characteristic of a distribution (i.e., measures of central tendency). Central tendency measures answer the question,  “What is the most typical score?” Provide information about the grouping of the numbers in  a distribution  by giving a single number that is  characteristic of the entire distribution Mode, Mean, Median
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mc 3018 stats - ANDTHENORMALCURVE WHATARESTATISTICS...

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