Chapter 1 - Chapter 1 Goals Overview of the field of...

Info iconThis preview shows pages 1–14. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 1 Goals Overview of the field of statistics Introduce several basic vocabulary words used in studying statistics: population, variable, statistic Learn basic process of sampling data
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 1: Statistics What is Biometrics? What is Statistics?
Background image of page 2
Example: Growth curves based on long term data for children One Child
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What is Statistics? Statistics : Defined: the science of collecting, describing and interpreting data Inferential Statistics : refers to the technique of interpreting the values resulting from the descriptive techniques and making decisions and drawing conclusions about the population. Descriptive Statistics : the collection, presenttion, and description of sample data Two areas of statistics:
Background image of page 4
Example You have 20 calves. You give ½ of them a growth supplement and look at growth in each group Descriptive statistics : average calf weight in each group Inferential statistics : In the future, will the growth supplement help calves gain weight faster than without supplement?
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Your turn Example: A study “randomly” chooses graduating seniors in Maryland and asks their High School GPA Are statements descriptive or inferential? 1. The mean GPA in your sample is 2.7: descriptive 2. 50% of the sample had values greater than 3.0: descriptive 4. You compare your numbers to those published for students in Virginia and conclude that students in the Maryland had a higher average GPA than Virginia: inferential 5. You compare your results to those for students 10 years ago and conclude that the average GPA in Maryland is higher than they were 10 years ago: inferential 3. Graduating seniors in Maryland have an average GPA of 2.7: descriptive
Background image of page 6
8 Basic Terms 1. Population : complete collection of individuals or objects that are of interest to the same collector 2. Sample : consists of the individuals, objects, or measurements selected from the population Sample Population You will get a different sample every time you collect data
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Example Population – every possible zebra that could be sampled Defined by researcher A statistical population may not equal a biological population A population may not even be living things
Background image of page 8
Sample – the subset of zebras that are selected for study Sample size ( n ) <<population size ( N )
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
3. Experimental Unit = a planned activity whose results yield a set of data. It includes the activities for both selecting the elements and obtaining the data values for zebra example = 1 zebra 4. Variable : characteristics of interest about each individual element of a population or sample
Background image of page 10
Possible Variables : Age Hair Color Height weight Choice of variable is dependent on what you want to study
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
More definitions 5 . Data value: a value which may be a number, word or symbol. Each variable is associated with one element of a population or sample has a value 6. Data : the set of values collected from the variable from each of the elements that belong to the sample 1 Data Value All Sample Data
Background image of page 12
7. Statistic
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 14
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 11/04/2011 for the course BIOM 301 at Maryland.

Page1 / 52

Chapter 1 - Chapter 1 Goals Overview of the field of...

This preview shows document pages 1 - 14. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online