General Changes Most of the research articles in each chapter''s ". in Research Articles" section were updated with diverse, engaging examples published in peer-reviewed journals in the past two to three years. Research topics covered now include: Electronic bullying among adolescents Gender perceptions of information and communication technologies Family socioeconomic status and children''s blood levels of lead Scrabble playing among expert players Awareness of national physical activity recommendations for health promotion among adults Video-game use among American youth The effect of color on IQ test performance A weight loss intervention for older individuals diagnosed with cancer Psychological treatments of emotional and behavioral problems among ethnic minority youth The ease of pronunciation of food additives and their perceived harmfulness Facebook use among university students Mindfulness, gender, and academic performance among students The gender and age of characters on cereal boxes The positive effects of playing prosocial video games The relationship between students'' alcohol intake and their use of strategies to control drinking Whether students report seeing color in their dreams All of the "Using SPSS" sections were updated to use SPSS 17.0. Throughout the book, references have been updated or added to the most recent relevant sources (for example, in Ch.12 we added references to recently published books and chapters that address the issue of conducting research using computerized and Internet methods) Throughout the book, changes have been made to the text to simplify exposition, particularly in the more demanding conceptual material (which will further help students master these central ideas). Web chapter that was available on companion website in the 4th edition will now be posted on the Instructor''s Resource Center (www.pearsonhighered.

com/irc). There is no companion website for the 5th edition. Changes to Each Chapter Chapter 1 Displaying the Order in a Group of Numbers Using Tables and Graphs · Frequency tables are now constructed going from the lowest value to the highest value (which provides consistency with the approach used in SPSS) · To keep the book brief, and to maintain the focus on histograms (which more commonly appear in actual journal articles), the material on frequency polygons was removed Chapter 2 The Mean, Variance, Standard Deviation, and Z Scores · The median is now calculated after lining up the scores from the lowest value to the highest value · A new section heading was added, "Comparing Representative Values", and the income values in the first paragraph in that section were updated · In the "Variability" section, the ages of the students described in the first paragraph were updated Chapter 3 Correlation and Prediction · An example (from a 2009 research study) of the use of the correlation coefficient for test-retest reliability is now included in the ". in Research Articles" section Chapter 4 Some Key Ingredients for Inferential Statistics: The Normal Curve, Sample versus Population, and Probability · In the "Why the Normal Curve is so Common in Nature section", a paragraph was added to clarify that the distributions of variables in the behavioral and social sciences do not always follow a normal curve. · Box 4--1 was updated and also now includes a reference to the 2008 U.S. presidential election. · In the "Probability, Samples, and Populations section", a new figure was added to further illustrate the relevance of probability to sample and populations.

· Several practice problems were updated using recent research articles (for example, a 2009 survey of smoking and exposure to smoking in movies among U.S. adolescents). Chapter 5 Introduction to Hypothesis Testing · In the "Implications of Rejecting or Failing to Reject the Null Hypothesis" section, a new paragraph was added discussing the issue of statistical versus practical significance. · A practice problem was added pertaining to the new ". in Research Articles" example of video-game use among American youth. Chapter 6 Hypothesis Testing with Means of Samples · Several of the figures (e.g.

, 6--3 and 6--4) now more clearly illustrate their respective points · The "Advanced Topic: Estimation and Confidence Intervals" section has been updated and streamlined. For example, the terms "point estimate" and "interval estimate" are no longer explicitly mentioned (although the relevant concepts are still described), which reduces the number of new terms introduced in this conceptually demanding chapter. The "Range of Possible Means Likely to Include the Population Mean" section now includes a summary paragraph. Chapter 7 Making Sense of Statistical Significance: Effect Size and Statistical Power · In the "Role of Power When a Result Is Statistically Significant: Statistical Significance versus Practical Significance" section, additional text was added regarding the issue of statistical versus practical significance. · A practice problem was added pertaining to the new ". in Research Articles" example of psychological treatments of emotional and behavioral problems among ethnic minority youth. · A new practice problem was added for a 2009 meta-analytic study of patients'' experiences of serious adverse events (such as a life-threatening medical event) during randomized controlled trials of medical treatments. Chapter 8 Introduction to the t test: Single Sample and Dependent Means · A new table was added that reviews and compares the features of the Z test, the t test for a single sample, and the t test for dependent means.

· The values for the second example of a t test for dependent means were revised (to create a more normal distribution) · A new practice problem was added for a 2008 study of individuals'' use of MySpace blogging and their level of social integration. Chapter 9 The t Test for Independent Means · The initial, demanding conceptual material for the t test for independent means is now divided into two sections (the "Distribution of Differences between Means" and "Estimating the Population Variance"), each with its own "How are you doing?" section. · The second example of a t test for independent means (the job skills example) has been revised to have unequal numbers of individuals in the experimental and control groups. Chapter 10 Introduction to the Analysis of Variance · The example for factorial analysis of variance was changed to one that is even easier to follow. · The ". in Research Articles" now includes a figure depicting a line graph of an interaction effect (from a 2009 study of mindfulness, gender, and academic performance among students). Chapter 11 Chi-Square Tests and Strategies when Population Distributions are not Norma l · The primary example for the chi-square test for goodness of fit has been changed to a more engaging example (based on a 2009 study of the gender of characters on cereal boxes). · The primary example for the chi-square test for independence uses the same engaging example as the chi-square test for goodness of fit (based on a 2009 study of the gender and age of characters on cereal boxes).

Chapter 12 Applying Statistical Methods in Your Own Research Project · Box 12--1 has been updated to include a discussion of current and future trends in statistics for the behavioral and social sciences. · The "Conducting the Study" section now includes a subsection on "Conducting Research Using Computerized and Internet Methods" (which includes references to relevant, recent books) · The "Checks for Accuracy" section now includes a description and relevant SPSS output related to the issue of identifying and correcting data entry mistakes. · The "Missing Values" section now includes instructions on how to use the SPSS "replace missing values" function to replace missing values with the mean of all other participants who had scores for a particular variable. The "Writing Up Your Results" section now includes references to recent, relevant books that address various issues associated with writing up research studies and producing tables/figures.