Class Notes (839,586)
Canada (511,415)
Psychology (3,977)
PSYC 1010 (115)

Chapter 8.docx

4 Pages

Course Code
PSYC 1010
Hank Davis

This preview shows page 1. Sign up to view the full 4 pages of the document.
Chapter 8: Confidence Intervals, Effect Size, and Statistical Power Confidence Intervals  Point estimate: a summary statistic from a sample that is just one number used as an estimate of the population parameter.  Interval estimate: based on a sample statistic and provides a range of plausible values for the population parameter  Confidence interval: an interval estimate, based on the sample statistic, that includes the population mean a certain percentage of the time, were we to sample from the same population repeatedly. Calculating confidence intervals with z Distributions Step 1: Draw a picture of a distribution that will include the confidence interval. Step 2: indicate the bounds of the confidence interval on the drawing. Step 2 ^^^^ Step 2 ^^^^ Step 3: Determine the z statistics that fall at each line marking the middle 95% Step 4: Turn the z statistic back into raw means M = - z(σ ) + M lower M M upper = z(σ )M+ M Step 5: Check that the CIs make sense  Does this interval make sense?  Does the sample mean fall in the middle of the interval? Effect size and Prep The effect of sample size on statistical significance  Statistical significance (rejecting the null hypothesis) provides only limited information about what is happening in any particular situation. Tell you that 2 groups are different.  Indeed, statistical significance only tells you that a difference, at the population level, is not zero (i.e, the null hypothesis). Which is really not that helpful.  When a hypothesis tests rejects or fails to reject the Ho, we say there has been a significant effect. This does not mean there has been a substantial effect.  The statistical significance indicates that we know this result was unlikely to have occurred by due to random sampling/a
More Less
Unlock Document

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.