Sampling Plans and Data Preparation in Market Research
Topic 5: Sampling Plan and Data Collection
Sample or Census
Differences: A census is a complete enumeration of all individuals and asks them what their opinion is. The problem is that it is impossible to survey the entire population. Sampling involves choosing people to learn something about the population.
Sampling Design Process
- Determine the Target Population
- Determine the Sampling Frame (how to identify them)
- Select a Sampling Technique
Sampling Techniques
Non-Probability Sampling Techniques
- Convenience
Ecology and Population Dynamics: Key Concepts
Ecology and Population Dynamics
Ecology: A discipline of biology that studies the interrelations among living things and their environments.
Ecosystem
The interacting system that encompasses a community and its nonliving, physical environment. Compare with community.
Community
An association of populations of different species living together in a defined habitat with some degree of interdependence. Compare with ecosystem.
Population
A group of organisms of the same species that live in a defined geographic
Mathematical Models of Disease Spread: A Curriculum Unit
Contents:
- Overview of the Unit
- Rationale and Objectives
- Section I
- The Origins of Microbes
- How Diseases Spread
- Cholera
- Malaria
- Immunity
- The Mathematical Connections
- Lesson Plan I
- Lesson II
- Lesson Plan III
- Lesson Plan IV
- Bibliography
- Web Sites
- Appendix: Connecting to the Mathematics Standards
- Endnotes
To Guide Entry
Overview of the Unit
In today’s society, there is an increasing demand for understanding how mathematics is relevant to everyday activities. As this demand for the application of mathematics increases, teachers
Read MoreProbability and Statistics: Formulas and Concepts
Counting
- Multiplication Rule: There are n1n2 . . . nr possible outcomes if an experiment has r steps and the ith step has ni outcomes.
- Ordered, Without Replacement: There are n(n−1)(n−2)…(n−k + 1) = n! / (n−k)! ways to choose k items out of n without replacement if the order in which the k items are chosen matters (e.g., out of 10 people, choose a president, vice president, and treasurer).
- Unordered, Without Replacement: There are n! / (n−k)!k! ways to choose k items out of n without replacement
Mastering Market Research: Surveys and Data Collection
Selection of Information Sources
In general, we can say that investigations can be:
- Exploratory: Generally performed after or secondary to qualitative information.
- Descriptive: Sources usually require data to observe behaviors, beliefs, habits, and attitudes.
- Grounded: Require the use of random testing techniques, laboratory work, or statistics.
Primary data is information not available, internally or externally. It requires some time to develop, and its cost is high. Secondary data is information already
Read MoreTree and Forest Measurement: Understanding Dendrometry
Dendrometry: Measuring Trees and Forests
Understanding Dendrometry
Dendrometry is the science that deals with determining the volume of forest trees and logs, as well as the growth and production of trees and forests. It involves measuring the volume of trees and forest stands, determining their age, and calculating their growth.
Key Concepts in Dendrometry
- Dendrometry: The measurement of trees and wooded masses.
- Epidometry: Studies growth in volume, determines the age of trees and forest masses, and