Biology Forums - Study Force

An organizational psychologist conducted a study to see whether upgrading a company's older computer system to newly released, faster machines would cause an increase in productivity from the current average of 120 units with a standard deviation of 20. The new system will be tested in a single department with 45 employees. The company has decided that an increase of less than 10 units will not justify purchasing the new system.
a.   What is the predicted effect size for an increase of 10 points?
b.   Explain the logic of what has been done.
c.   Advanced topic: Sketch the distributions involved.
d.   Advanced topic: If the data are analyzed at the .01 significance level, what will be the power of the study?
e.   Advanced topic: Explain your answer to a person who understands hypothesis testing with means of samples, but who is not familiar with power. 

Content hidden

Thank you so much for the reply. Your answer makes a lot of sense.

thank you!

Thank you

Thank you.

Thank you so much

Thank you

Thanks