I need help with this question please! Thank you!

User Generated

Senaxyvaj

Mathematics

Question Description

You are designing a study to be evaluated with a two-sample nondirectional independent t test at a = .05.  You want .90 power.  You expect Cohen’s d to be about .40.  How many subjects will you need peer group?

Student has agreed that all tutoring, explanations, and answers provided by the tutor will be used to help in the learning process and in accordance with Studypool's honor code & terms of service.

Explanation & Answer

Thank you for the opportunity to help you with your question!

j=d*sqrt(n/2)

where j is the power of the test

d is the cohen's d

n is the sample size per group

0.9=0.4 sqrt(n/2)

0.81=0.16n/2

1.62=0.16n

n=10

the number of subjects is 10 per sample

Please let me know if you need any clarification. I'm always happy to answer your questions.

PuevfchfCebs (153)
Rice University

Anonymous
Really helped me to better understand my coursework. Super recommended.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4