chpt 2

# chpt 2 - Chapter 2 Learning Outcomes 1 i Understanddatat

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2/3/2010 1 Chapter 2 Frequency Distributions PowerPoint Lecture Slides Essentials of Statistics for the Behavioral Sciences Seventh Edition by Frederick J Gravetter and Larry B. Wallnau Chapter 2 Learning Outcomes • Understand frequency distribution 1 •Organize data into regular frequency distribution 2 3 • Organize data into grouped frequency distribution • Understand data presented in a table 4 •Organize data into frequency distribution graphs 5 • Understand data that presented in a graph 6 Introduction to Frequency Distributions •A frequency distribution is – An organized tabulation – Showing the number of individuals located in each category on the scale of measuremen each category on the scale of measurement • Can be either a table or a graph • Always shows – The categories that make up the scale – The frequency, or number of individuals, in each category Xf 8 7 10 9 6 4 9 8 7 8 1. Determine the number of scores (N) 2. Find the highest and lowest values 3. List all possible values even if there are no scores in that category 4 List from highest to 10 9 8 6 9 7 8 8 4. List from highest to lowest 5. Find frequency associated with that value (f) how many people got that score 6. Double check your math Adding up the Scores • In order to calculate anything we still need to be able to sum ( Σ ) the scores. Lk l it d b t • Looks complicated but. . . Σ f = N Σ fx = Σ x for a frequency distribution Proportion and Percent • Proportion—fraction of the total group associated with each score. N f p = • Percent ) 100 ( ) 100 ( N f p =

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2/3/2010 2 Frequency, Proportion and Percent in a Table Xf p = f/N percent = p(100) 51 1/10 = .10 10% 4 2 2/10 = 20 20% 2/10 .20 33 4/10 = .40 40% 23 0/10 = .00 0% 11 1/10 = .10 10% This is an adaptation of example 2.3 Learning Check • Use the Frequency Distribution Table to determine how many subjects were in the study X f 52 44 31 20 13 10 A 15 B 33 C Impossible to determine from table D Learning Check - Answer • Use the Frequency Distribution Table to determine how many subjects were in the study X f 10 A 15 B 33 C Impossible to determine from table D Learning Check • Is each of these statements
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chpt 2 - Chapter 2 Learning Outcomes 1 i Understanddatat

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