Textbook Notes (359,268)
Canada (156,147)
Psychology (3,237)
PSYC 1010 (57)
c (11)
Chapter 7

Chapter 7.docx

3 Pages
83 Views
Unlock Document

School
University of Guelph
Department
Psychology
Course
PSYC 1010
Professor
c
Semester
Fall

Description
Chapter 7- Hypothesis Testing with Z Scores - Z Test- a hypothesis test in which we compare data from one sample to a population for which we know the mean and the standard deviation Z Table - Provides the percentage of scores between the mean and a given z value - The key to standardization- allows us to translate the standardized z distribution into percentages and individual z scores into percentile rankings - Normal Distributions  About 68% of scores fall within one z score of the mean  About 96% of scores fall within two z scores of the mean  Nearly all scores fall within three z scores of the mean - Three different ways to identify the same point beneath the normal curve :  Raw score  Z score  Percentile ranking - Determining the % associated with a given z statistic :  Convert a raw score into a z score  Look up a given z score on the z table to find the percentage of scores between the mean and that z score - Calculating the percentile for a positive z score  To find the percentage of scores below a certain score : add the percentage between the mean and the positive z score to 50%, which is the percentage of scores below the mean - Calculating the percentage above a positive z score  Subtract the percentage between the mean and the positive z score from 50%, which is the full percentage of scores above the mean - Calculating the percentage at least as extreme as our z score  Double the % that are extreme enough to be below a z score to find the total percentage of heights that are as far as or farther from the mean as the z score - Calculating the percentile for a negative z score  Subtract the percentage between the mean and the z score from 50%, the total percentage below the mean - Calculating the percentage above a negative z score  Add the percentage between the mean and the negative z score to 50%, the percentage above the mean - Calculating a score from a percentile  Calculate the percentage between the mean and the z score  Look up that percentage on the z table- find the associated score  Convert the z score to a raw score using the formula X=z ( Z Table and Distribution of Means - The z table can also be used to determine percentages and z statistics for distributions of means - First calculate the mean and the standard error of the distribution of means :  M=  M= √ - We can then calculate the percentage  Convert a z statistic using the mean and standard error that we just calculated  Determine the percentage below this z statistic The Assumptions and Steps of Hypothesis Testing - Assumptions- characteristic that we ideally require the population from which we are sampling to have so that
More Less

Related notes for PSYC 1010

Log In


OR

Don't have an account?

Join OneClass

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

Sign up

Join to view


OR

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.

Submit