Measures of Central Tendency On a quiz given to 5 students, the scores were as follows: 17, 19, 20, 22, 22 What is the mean? What is the median? What.

Slides:

Advertisements

Similar presentations

Chapter 1 review “Exploring Data”

Advertisements

Exam One Review Quiz Psy302 Quantitative Methods.

Psy302 Quantitative Methods

Chapter 13 Conducting & Reading Research Baumgartner et al Data Analysis.

Z - SCORES standard score: allows comparison of scores from different distributions z-score: standard score measuring in units of standard deviations.

LowHigh Equal Distance Quantification Individual Differences

NORMAL CURVE Needed for inferential statistics. Find percentile ranks without knowing all the scores in the distribution. Determine probabilities.

Normal Distributions What is a Normal Distribution? Why are Many Variables Normally Distributed? Why are Many Variables Normally Distributed? How Are Normal.

Did you know ACT and SAT Score are normally distributed?

z-Scores What is a z-Score? How Are z-Scores Useful? Distributions of z-Scores Standard Normal Curve.

Quiz 5 Normal Probability Distribution.

Quiz 2 Measures of central tendency Measures of variability.

Data Analysis and Statistics. When you have to interpret information, follow these steps: Understand the title of the graph Read the labels Analyze pictures.

1.3 Psychology Statistics AP Psychology Mr. Loomis.

Copyright © 2011 Pearson Education, Inc. Putting Statistics to Work.

And the Rule THE NORMAL DISTRIBUTION. SKEWED DISTRIBUTIONS & OUTLIERS.

Examples for the midterm. data = {4,3,6,3,9,6,3,2,6,9} Example 1 Mode = Median = Mean = Standard deviation = Variance = Z scores =

Thinking About Psychology: The Science of Mind and Behavior 2e Charles T. Blair-Broeker Randal M. Ernst.

Describing Behavior Chapter 4. Data Analysis Two basic types  Descriptive Summarizes and describes the nature and properties of the data  Inferential.

Interpreting Performance Data

Descriptive Statistics

Chapter 6.1 Normal Distributions. Distributions Normal Distribution A normal distribution is a continuous, bell-shaped distribution of a variable. Normal.

KNR 445 Statistics t-tests Slide 1 Variability Measures of dispersion or spread 1.

Thinking Mathematically Statistics: 12.5 Problem Solving with the Normal Distribution.

IE(DS)1 May of the measures that are of interest in psychology are distributed in the following manner: 1) the majority of scores are near the mean 2)

Measures of Central Tendency And Spread Understand the terms mean, median, mode, range, standard deviation.

DATA MANAGEMENT MBF3C Lesson #5: Measures of Spread.

Psychology’s Statistics. Statistics Are a means to make data more meaningful Provide a method of organizing information so that it can be understood.

AP Psychology September What is “Statistics”?  A common language for describing, organizing, and interpreting data  Aspects:  Distribution 

Quick Review Central tendency: Mean, Median, Mode Shape: Normal, Skewed, Modality Variability: Standard Deviation, Variance.

Dr. Serhat Eren 1 CHAPTER 6 NUMERICAL DESCRIPTORS OF DATA.

MDM4U Chapter 3 Review Normal Distribution Mr. Lieff.

Determination of Sample Size: A Review of Statistical Theory

© 2010 Pearson Prentice Hall. All rights reserved. CHAPTER 12 Statistics.

Normal Distribution. Normal Distribution: Symmetric: Mean = Median = Mode.

Psychology 290 – Lab 9 January Normal Distribution Standardization Z-scores.

 Two basic types Descriptive  Describes the nature and properties of the data  Helps to organize and summarize information Inferential  Used in testing.

Chapter 3 Review MDM 4U Mr. Lieff. 3.1 Graphical Displays be able to effectively use a histogram recognize and be able to interpret the various types.

Chapter 4 Variability. Introduction Purpose of measures of variability Consider what we know if we know that the mean test score was 75 Single score to.

Appendix B: Statistical Methods. Statistical Methods: Graphing Data Frequency distribution Histogram Frequency polygon.

Unit 2 (F): Statistics in Psychological Research: Measures of Central Tendency Mr. Debes A.P. Psychology.

Chapter 3 Review MDM 4U Mr. Lieff. 3.1 Graphical Displays be able to effectively use a histogram name and be able to interpret the various types of distributions.

Math 15 – Elementary Statistics Chapter 5 – Part 2 Summarizing Data Numerically.

BASIC STATISTICAL CONCEPTS Chapter Three. CHAPTER OBJECTIVES Scales of Measurement Measures of central tendency (mean, median, mode) Frequency distribution.

Summary Statistics: Measures of Location and Dispersion.

Thinking About Psychology, Second Edition Module 5: Psychology’s Statistics iClicker Questions Charles T. Blair-Broeker Randal M. Ernst Questions Written.

Question 1 A normal distribution has a mean of 12.7 and a standard deviation of 1.3 Find (a)P (X > 14.2) (b)P ( 8 < X < 10) (c)The 73 rd percentile.

Thinking Mathematically Statistics: 12.4 The Normal Distribution.

Educational Research: Competencies for Analysis and Application, 9 th edition. Gay, Mills, & Airasian © 2009 Pearson Education, Inc. All rights reserved.

Descriptive Statistics for one variable. Statistics has two major chapters: Descriptive Statistics Inferential statistics.

Statistics Josée L. Jarry, Ph.D., C.Psych. Introduction to Psychology Department of Psychology University of Toronto June 9, 2003.

Normal Distribution S-ID.4 Use the mean and standard deviation of a data set to fit it to a normal distribution and to estimate population percentages.

Chapter 3 Review MDM 4U Mr. Lieff. 3.1 Graphical Displays be able to effectively use a histogram name and be able to interpret the various types of distributions.

Psychology’s Statistics Appendix. Statistics Are a means to make data more meaningful Provide a method of organizing information so that it can be understood.

Chapter 2 The Mean, Variance, Standard Deviation, and Z Scores.

Lecture 8 Data Analysis: Univariate Analysis and Data Description Research Methods and Statistics 1.

Evaluating Data in Research

Measures of Central Tendency

Central Tendency Central Tendency – measures of location for a distribution Mode – the commonly occurring number in a data set Median – the middle score.

Notes Over 7.7 Finding Measures of Central Tendency

Psychology Statistics

Evaluation and Assessment of the Individual: Week 2 Discussion

Quantitative Methods PSY302 Quiz Normal Curve Review February 6, 2017

Chapter 5 A Normal World.

CHAPTER 12 Statistics.

Statistics PSY302 Quiz Chapters 2

Statistics PSY302 Quiz Chapters 2

Shape, Center, Spread.

Descriptive statistics for groups:

Presentation transcript:

Measures of Central Tendency On a quiz given to 5 students, the scores were as follows: 17, 19, 20, 22, 22 What is the mean? What is the median? What is the mode?

Skewed Distributions Out of 108 students in Mrs. O'Connor's AP Psychology classes, 107 people earned an A on the Chapter 2 Exam. One person earned an F. What happened to the mean as a result of the one F? What type of distribution is this?

Standard Deviation Two tests were given. The standard deviation of the first test was 10. The standard deviation of the second test was 15. Which test had scores that were more spread out?

Z-scores Ryan earned a 70 on a normally distributed test with a mean of 60. The standard deviation was 5. What is Ryan's z-score? Alyssa earned a 65 on a normally distributed test with a mean of 80. The standard deviation was 15. What is Alyssa's z-score?

Percentile Rank For a language test with normally distributed scores, the mean was 75 and the standard deviation was 15. Approximately what percentage of test-takers scored a 60 or above? For a language test with normally distributed scores, the mean was 40 and the standard deviation was 10. Approximately what percentage of test-takers scored a 50 or above?

Percentile Rank Dr. Zimbardo conducted an intelligence test in which the scores were normally distributed. The mean was 85 and the standard deviation was 10. What percentage of people scored a 95 or above? Show your work/distribution. In the above question, what was the variance? Dr. Milgram conducted a strength test in which the scores were evenly distributed. The mean was 115 and the standard deviation was 5. What percentage of people scored 105 or above? Show your work/distribution. In the above question, what was the variance?