PSYC301-01Sept15Lecture(ForPosting)

# PSYC301-01Sept15Lecture(ForPosting) - PUREMEM 1 2 3 4 If...

This preview shows pages 1–6. Sign up to view the full content.

PUREMEM 1. If psychologists want to give the representative value of a variable based on the scores in a sample, they usually give the mean . 2. If you are given the variance for a sample, you can calculate the SD simply by doing what? Taking the square root of the variance 3. If you measure the exact same behavior in two different samples and you find that scores are more variable in Sample B than in Sample A, then it must be that both the variance and the standard deviation are larger in Sample B than in Sample A. 4. The SD is the number that gives the average amount by which scores in a sample differ from the mean .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Calculating standard deviation using Excel If you want to quickly determine the standard deviation of a group of scores, do the following: 1) Enter the scores in Microsoft Excel, one number per cell 2) In any empty cell, type this: =stdev( 3) Using the mouse, select all the cells containing the group of scores 4) In the cell where you previously typed =stdev, now add this: ) 5) Press Enter and a number will appear in the cell That number is the standard deviation
Z scores

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Describing samples After collecting data about numeric variables from a random sample of people, you can now do 4 things: 1. Show how scores are distributed over all the possible values of the variable By making a histogram 2. Describe the shape of the distribution Unimodal, multimodal, symmetrical, skewed 3. Give the representative value of the variable Mean or mode (but usually the mean) 4. Describe amount of variability among scores Variance or SD All 4 are ways of describing the whole sample
Describing individual scores within a sample Next you will learn a descriptive statistic that allows you to say something interesting about

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern