CHAPTER 4 Data collection and sampling methods to accompany Introduction to business statistics fourth edition by ronald M. Weiers Presentation by Priscilla Chaffe-Stengel Donald N. stengel o 2002 The Wadsworth Group
CHAPTER 4: Data Collection and Sampling Methods to accompany Introduction to Business Statistics fourth edition, by Ronald M. Weiers Presentation by Priscilla Chaffe-Stengel Donald N. Stengel © 2002 The Wadsworth Group
Chapter 4-Learning objectives Describe the types of studies and the eir purposes Exploratory Descriptive Causal Predictive Explain the differences between data sources Primar Secondary: Internal versus external Differentiate between sampling designs Probabilitistic versus nonprobabilitistic designs Differentiate between sampling and nonsampling errors o 2002 The Wadsworth Group
Chapter 4 - Learning Objectives • Describe the types of studies and their purposes: – Exploratory – Descriptive – Causal – Predictive • Explain the differences between data sources: – Primary – Secondary: Internal versus External • Differentiate between sampling designs: – Probabilitistic versus nonprobabilitistic designs • Differentiate between sampling and nonsampling errors. © 2002 The Wadsworth Group
ll Chapter 4- Key terms error Probability sample Sampling Simple random sample Nonsampling Sⅴ stematic sample ° Types of Studies Stratified sample Exploratory Cluster sample Descriptive Causal Nonprobability sample Predictive Convenience sample ypes of Data Quota sample P Purposive sample rimar Secondary Judgment sample > Internals external o 2002 The Wadsworth Group
Chapter 4 - Key Terms • Error – Sampling – Nonsampling • Types of Studies – Exploratory – Descriptive – Causal – Predictive • Types of Data – Primary – Secondary »Internal vs External • Probability sample – Simple random sample – Systematic sample – Stratified sample – Cluster sample • Nonprobability sample – Convenience sample – Quota sample – Purposive sample – Judgment sample © 2002 The Wadsworth Group
l Types of studies Exploratory Understand a problem, identify relevant variables formulate hypotheses Descriptive Establish reliable measurements Causal Determine relationships among variables PredictiⅤe Use analysis to forecast o 2002 The Wadsworth Group
Types of Studies • Exploratory – Understand a problem, identify relevant variables, formulate hypotheses • Descriptive – Establish reliable measurements • Causal – Determine relationships among variables • Predictive – Use analysis to forecast © 2002 The Wadsworth Group
l Sources of data ° Primary Data generated by the researcher for this study Survey experimental, observational research most popular Tend to require more time and expense than secondary data condar Data gathered from another source or for another urpose > Internal sources within the researchers organization External sources, including governmental, trade, commercial and internet sources o 2002 The Wadsworth group
Sources of Data • Primary – Data generated by the researcher for this study – Survey, experimental, observational research most popular – Tend to require more time and expense than secondary data • Secondary – Data gathered from another source or for another purpose »Internal sources within the researcher’s organization »External sources, including governmental, trade, commercial and internet sources © 2002 The Wadsworth Group