What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables What Are We Summarizing Lecture 11 Sections 4 1 4 2 Quantitative Variables Caution Continuous and Discrete Variables Assignment Robb T Koether Hampden Sydney College Mon Feb 2 2008 Outline What Are We Summarizing Robb T Koether Homework Review 1 Homework Review 2 Introduction 3 Qualitative Variables 4 Quantitative Variables Caution Continuous and Discrete Variables 5 Assignment Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Homework Review What Are We Summarizing Robb T Koether Exercise 3 31 p 184 Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment A nutrition experimenter intends to compare the weight gain of male rats fed Diet A with that of male rats fed Diet B Twenty rats are available for this experiment She would like to randomly allocate 10 rats to Diet A and the remaining 10 rats to Diet B She decides to label the 20 rats as follows 01 02 03 20 Homework Review What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Exercise 3 31 p 184 a Use the experimenter s labels and your calculator with a seed value of 72 to identify the labels of the first 10 rats selected that would be assigned to Diet A b The experimenter hopes Diet A is the better diet To avoid possible bias in her results because of her favoritism she blinds herself to her experiment Explain how she would do this Homework Review What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Solution a The first 10 distinct random numbers are 14 13 5 16 9 3 4 2 7 and 10 b She would make sure that the person who made the measurements on the rats did not know which rats were given Diet A and which were given Diet B Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Introduction What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment Statisticians like to quantify everything Given a set of data they want to summarize it with a single number How might we summarize A sample of political affiliations A sample of body weights A sample of steak preferences rare medium etc A sample of family sizes A sample of temperatures throughout the day Qualitative Variables What Are We Summarizing Robb T Koether Homework Review Definition Qualitative variable Introduction A qualitative variable is a variable whose values are nonnumerical Qualitative Variables Quantitative Variables Caution Continuous and Discrete Variables Assignment The values of a qualitative variable may or may not have a natural order Political affiliation Steak preference Summarizing Qualitative Variables What Are We Summarizing Robb T Koether Homework Review Introduction Qualitative Variables Quantitative Variables Caution Continuous
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