{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Week 9_Ch10_ANOVA

Week 9_Ch10_ANOVA - Chapter 10 Analysis of Variance(ANOVA...

Info icon This preview shows pages 1–10. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 10 Analysis of Variance (ANOVA)
Image of page 1

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

View Full Document Right Arrow Icon
What is ANOVA ANOVA is the primary statistical approach used to evaluate the effects of an independent variable involving more than two levels in experimental design (One-Factor, or One-way, ANOVA). E xample - does blood pressure vary by age group? ANOVA is also used to test the effects involving more than one IVs (Two- Factor, or Two-Way, ANOVA). E xample - does blood pressure vary by sex and/or age group?
Image of page 2
Example of a study using ANOVA (from text pg. 240) Studying recall of visual stimuli Showed people 3 types of drawings Detailed Outline Incomplete Outline Which type of drawing will people recall the best?
Image of page 3

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

View Full Document Right Arrow Icon
Example continued... Independent variable : Factor: type of drawing Level: 3 (Detailed, Outline Incomplete, Outline) Dependent variable : number of items recalled after viewing 30 drawings for 4 seconds each 5 subjects were in each experimental condition
Image of page 4
The data: are the 3 groups really different? Incomplete  Outline  Outline  Detailed  Drawing  19  14  15  13  13  10  16  16  11  17  12  12  20  10  12  Mean = 17  Mean = 13  Mean = 12   
Image of page 5

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

View Full Document Right Arrow Icon
Are the groups really different?
Image of page 6
Analysis strategy The mean of all the scores, the GLOBAL MEAN, is 14, but people vary around that mean. Why? Maybe the 3 groups are really different (drawing type really does affect recall) Maybe it’s just individual differences (random variation around the mean)
Image of page 7

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

View Full Document Right Arrow Icon
Analysis strategy (2) The basic concept of ANOVA is to partition variance of the dependent variable to between-group and within-group variations. Strategy: break up the total variance into 2 components: Between-groups variance - the differences between the 3 groups Within-groups variance - the differences among the subjects within each group
Image of page 8
Hypothesis testing with ANOVA Null hypothesis : assume that there is no difference in the mean of the scores across the groups (all the variation in scores is caused by random error or individual differences, not by which group a subject is in).
Image of page 9

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

View Full Document Right Arrow Icon
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern