COMM3710 - Fall 2011 - Section 001 - Lecture Notes - 09/01

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riosjosh

Rounding Rules for the semester: Round to two decimal places every time you compute.

Sample regular letters
Population Greek letters

Central Tendency
Properties of the mean
  1. The mean is that score or potential score in a distribution about which the sum of the deviation scores is zero.
    1. Score or potential score means that the mean is an average so the average doesn’t necessarily have to be in the data set
    2. The deviation scores should always equal zero
    3. The mean score or potential score in a distribution about which the sum of the squared deviations is a minimum
    4. The outliners greatly influence the mean. Dragging it up or down.

The lowest measurement we have is nominal or categorical (i.e. Ford, Dodge, Chevy are given numbers 1, 2, 3). These categories have to be mutually exclusive and exhaustive.

The next measurement we have is ordinal. They have the same characteristics of nominal but also have rank value.

The next measurement is interval. They have the same characteristics of ordinal and the distance between the numbers is known and equal. As well as the zero is arbitrary.

Ratio. They have the same characteristics of interval and have a meaningful zero.

The mean is the expected value.

Using the median makes sure that the outliners don’t skew the average.

The mode is only appropriate for nominal data.

The overall, grand, or weighted mean is all the same terms. You have to weight out your means if you are going to average together all them together.

Transformation of Distributions
Addition and subtraction with the mean. The new mean is the same as the old mean plus or minus the constant.