Psyc 210 HOMEWORK 03

Psyc 210 HOMEWORK 03 - b Sketch the distributions involved...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Psyc 210: Statistical Principles in Psychological Research HOMEWORK 3 DUE: FEBRUARY 18-21 Please show all of your work on a separate sheet. 1. On a particular memory task in which words are learned in random order, it is known that people can recall a mean of 11 words with a standard deviation of 4, and the distribution follows a normal curve. A cognitive psychologist, to test a particular theory, modifies that task so that the words are presented in a way in which words that have a related meaning are presented together. The cognitive psychologist predicts that under these conditions, people will recall so may more words that there will be a large effect size. She plans to test this with a sample of 20 people, using the .01 significance level, two-tailed. a) What is the power of this study?
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: b) Sketch the distributions involved, showing the area for alpha, beta, and power. c) How large would her sample size need to be in order to achieve a power level of .8? 2. In a planned study involving a standard test, the population is known to have a mean of 500 and a standard deviation of 100. The researchers predict that their planned experimental procedure will produce a large effect. What is the predicted mean of the population that will be given the experimental procedure? 3.In a completed study, there is a known population with a normal distribution, µ = 25 and σ =12. What is the estimated effect size if a sample given an experimental procedure has a mean of (a) 19, (b) 22, (c) 35? Also indicate whether the effect is approximately small, medium, or large....
View Full 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