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Take the McCroskey test yourself to see your apprehension level. This PowerPoint will walk through the comparison of means of the pre and post-tests. Remember the Types of Scales?. Nominal Data (Chi-square) classification data, e.g. m/f

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take the mccroskey test yourself to see your apprehension level

Take the McCroskey test yourself to see your apprehension level

This PowerPoint will walk through the comparison of means of the pre and post-tests

McCroskey Scenario t-test

remember the types of scales
Remember the Types of Scales?

Nominal Data (Chi-square)

  • classification data, e.g. m/f
  • no ordering, e.g. it makes no sense to state that M > F
  • arbitrary labels, e.g., m/f, 0/1, etc

Ordinal Data(t-test)

  • ordered but differences between values are not important
  • e.g., political parties on left to right spectrum given labels 0, 1, 2
  • e.g., Likert scales, rank on a scale of 1..5 your degree of satisfaction
  • e.g., restaurant ratings

Interval Data

  • ordered, constant scale, but no natural zero
  • differences make sense, but ratios do not (e.g., 30°-20°=20°-10°, but 20°/10° is not twice as hot!
  • e.g., temperature (C,F), dates

Ratio Data

  • ordered, constant scale, natural zero
  • e.g., height, weight, age, length
  • Quoted from http://www.stat.sfu.ca/~cschwarz/Stat-301/Handouts/node5.html

McCroskey Scenario t-test

slide3
Take McCroskey'sPRCA.  http://ww3.llcc.edu/speechsurvey/survey.aspx OR http://www.jamescmccroskey.com/measures/prca24.htm

Photo Source http://2.bp.blogspot.com/_27z_ybX1fcc/SafUfnpKgwI/AAAAAAAAAI4/nwRnSJx33dw/s400/speakerbestself.jpg

McCroskey Scenario t-test

study
Study
  • Imagine that a group of 20 students enrolled in Dr. Cohn's public speaking course.  These students took McCroskey's test on the first day of their public speaking course.  Scores can range from 24-120, and a score above 65 suggests higher than average apprehension. Dr. Cohn is concerned that she has so many apprehensive students in the class.  Here are their scores:
  • After one term of instruction, Dr. Cohn administered the test at the end of the course because she wanted to see if taking the course lowered student apprehension. 
  • In this case, there is a pre-post test for one group and the data on a scale.  Dr. Cohn asks you to calculate the results using a t-test. 
  • Is there a significant difference in the communication apprehension level of the class members before and after taking Dr. Cohn's course?

McCroskey Scenario t-test

first you enter the data
First, you enter the data.

McCroskey Scenario t-test

select two
Select two

McCroskey Scenario t-test

related data
Related data

McCroskey Scenario t-test

normal distribution
Normal Distribution

McCroskey Scenario t-test

the statistics coach help function guides you in what statistical test to use
The “Statistics Coach” help function guides you in what statistical test to use.

McCroskey Scenario t-test

slide12

What are the means to be compared? The average of the pretest, the average of the posttest. The calculator will figure this automatically as part of the t-test calculation.

  • Add the 20 scores from the pretest = 1600
  • Divide by 20 students in the class = 80 is the average or mean for the pretest.
  • Add the 20 scores from the posttest = 1193
  • Divide by 20 students in the class = 51

McCroskey Scenario t-test

enter data
Enter Data

McCroskey Scenario t-test

from menu
From menu
  • Select “Analyze”
  • Select “Compare Means,” which is what a t-test does.
  • Select “Paired-Samples T Test,” which is what the Statistics Coach told us to do based on our answers to the various questions.

McCroskey Scenario t-test

if you don t have spss here is a calculator http www physics csbsju edu stats t test bulk form html
If you don’t have SPSS, here is a calculator: http://www.physics.csbsju.edu/stats/t-test_bulk_form.html

McCroskey Scenario t-test

slide19

The standard deviation helps the researcher determine how much distance from the mean is typical and how much is considered significant. 

McCroskey Scenario t-test

slide20

Using unpaired t-testt= 4.46 sdev= 20.2 degrees of freedom = 38 The probability of this result, assuming the null hypothesis, is less than .0001

  • Scores are significantly lower after the course. (Remember, this is fictional research.)
  • We can feel confident that completing the public speaking course helped lower student communication apprehension.

McCroskey Scenario t-test