Textbook Notes (367,753)
Canada (161,369)
Psychology (34)
PSYC-2101 (3)
P.Pearson (3)
Chapter 4

Data Analysis Chapter 4.docx

3 Pages
Unlock Document


Measures of Central Tendency  Arithmetic Mean o Add up all scores and divide by number of scores. o Mean is sensitive to the exact value of all the scores in the distribution. o The sum of the deviations about the mean equals zero. Written out: ∑ ̅ o The mean is sensitive to extreme scores. o The sum of the squared deviations of all the scores about their 2 mean is a minimum. Written out: ∑ ̅ is a minimum. o Under most circumstances, of the measures used for central tendency, the mean is least subject to sampling variation.  The Overall Mean o Used to calculate the mean of all scores when presented with the mean of several different groups. ∑ ∑ o ̅ o Ex. There are three groups; the first includes 50 subjects with a mean of 75, the second includes 40 subjects with a mean of 80, and the third includes 25 subjects with a mean of 70. What is the overall mean? ̅  The Median (Mdn): the scale below which 50% of the scores fall. It is therefore the same calculation as P .50 o Less sensitive than the mean to extreme scores. o Under usual circumstances, the median is more subject to sampling va
More Less

Related notes for PSYC-2101

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.