### Create a StudySoup account

#### Be part of our community, it's free to join!

Already have a StudySoup account? Login here

# Mean, Median, & Mode Psyc-21621

KSU

### View Full Document

## About this Document

## 14

## 0

## Popular in Quantitative Methods Psych I

## Popular in Psychlogy

This 3 page Class Notes was uploaded by Amy Turk on Wednesday April 27, 2016. The Class Notes belongs to Psyc-21621 at Kent State University taught by Dr. Gordon in Spring 2016. Since its upload, it has received 14 views. For similar materials see Quantitative Methods Psych I in Psychlogy at Kent State University.

## Similar to Psyc-21621 at KSU

## Popular in Psychlogy

## Reviews for Mean, Median, & Mode

### What is Karma?

#### Karma is the currency of StudySoup.

#### You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 04/27/16

PSYCH STATS POWERPOINT 3 ● percentile is a score that is used to determine the percentile rank ● central tendency: single score chosen to represent the entire set of scores ○ defines the center of distribution ○ allows you to compare 2 sets of data ● problems… its a single score ○ no standard procedure to calculate ○ not all distributions are the same ■ some aren’t symmetrical and this makes it more difficult to determine the best value to be representative of the sample ● the mean: the average ● median: middle value ● mode: most common value Mode ● calculated by looking at the most common value ● taken straight from the scores ● best used for nominal data ● if two values occur the most: middle modes ○ 1 = unimodal ○ 2 = bimodal ○ 3 or more = multimodal ● can be used with categorical/non numerical data ● always an actual score from the data set ● multiple modes ● describes shape ○ a better indication of the shape of the distribution than the mean alone ● identifies location of the peak in frequency distribution Median ● midpoint score ○ half are above and half are below ● order scores from lowest to highest ● relatively unaffected by extreme scores ● better alternative than the mean when the distribution is skewed ● we don’t care about distance between scores with the median ● useful for ordinal scale as well ○ defined by direction Mean ● the average = the sum of scores divided by the number of scores ○ mew symbol = mean for population ○ X with line on top = sample mean ■ sum of all scores in a sample divided by the sample size ● calculating population mean = sigma X divided by N ● calculating sample mean = sigma X divided by n ● weighted mean ○ use for multiple sets of scores ■ when you have means for different groups but want to know the overall combined mean ○ add scores and divide by the total size ● characteristics of a mean change… ○ when you add a score or remove a score ○ change a score ○ add/subtract/multiply/divide a constant from the score ● changing a score changes the sum of scores ○ changing a score does not change n ● mean moves in the direction of the change ○ not by the same amount as the change ● adding or removing a score ○ changes the sum of scores (sigma X) ○ changes the number of scores (n) ○ the mean moves ● median is a better representative for income ○ ordinal is best for median ● mode is best for categorical data ● adding or removing a score ○ changes the sum of scores ○ changes n… total number of scores ○ the mean moves ■ add = mean moves toward the added score ■ remove = mean moves away from the removed score ■ the only exception is if you add a score equal to the mean ● adding or subtracting a constant ○ the mean will increase by the constant amount if you add a constant ■ if you remove a constant, the mean will get lower by that exact constant ● multiply/divide by a constant ○ typically done when you want to change the scale of measurement ○ if you multiply by a constant, the mean changes by multiplying it by that constant ○ same thing for division ● when you include a constant, it changes the sum of the scores, but not the total number of scores ● the mean is the most preferred method ○ uses every score… most representative ○ closely related to other descriptive stats ● we expect that the different measure of central tendency will usually be the same ○ this isn’t always true ● symmetrical distributions ○ mean and median are always the same ● unimodal: one mode ○ same as mean and median ● bimodal/multimodal ○ multiple modes ● the mode is the highest rank ○ there may not be a mode ■ if all the data is exactly the same ● skewed distributions ○ mode will be located at the peak on one side ■ mean usually will be displaced toward the tail on the other side ○ median is usually between mean and mode ● mean affected by outliers ○ gets pulled in the direction of the outliers ● positively skewed: mode, median, mean ○ mean is farther to the right as influenced by extreme scores at tail ● negatively skewed: mean, median, mode ○ mean is farther to the left ● mode = unaffected by skew ● median = mildly affected by skew ● a skew means that there is at least one outlier ● central tendency is a descriptive statistic ○ used heavily in inferential stats

### BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.

### You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

## Why people love StudySoup

#### "Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

#### "Selling my MCAT study guides and notes has been a great source of side revenue while I'm in school. Some months I'm making over $500! Plus, it makes me happy knowing that I'm helping future med students with their MCAT."

#### "Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

#### "It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

### Refund Policy

#### STUDYSOUP CANCELLATION POLICY

All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email support@studysoup.com

#### STUDYSOUP REFUND POLICY

StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here: support@studysoup.com

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to support@studysoup.com

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.