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Chapter 1

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

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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

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Chapter 1: Statistics What is Biometrics? What is Statistics?
Example: Growth curves based on long term data for children One Child

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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:
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?

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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
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

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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
Sample – the subset of zebras that are selected for study Sample size ( n ) <<population size ( N )

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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
Possible Variables : Age Hair Color Height weight Choice of variable is dependent on what you want to study

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More definitions 5 .
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