Collecting Data

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by ladyhawk5
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Collecting Data

Lesson 1-1 Collecting Data

What is a good report?What is studied?*VARIABLESWho was studied?*SAMPLE OR POPULATIONWhat was found?*SUMMARY OF DATA

Words to be Defined*Statistics*Variable*Population*Sample*Random Sample*Capture-Recapture MethodBias

Capture-Recapture Method*used by scientists to determine a population estimateNumber of tagged animals in sample= Number of tagged in population Number of animals in sample = Total Population (unknown(p))

Variable- a characteristic which can be classified, counted, or measured (gender, height, weight, religion)

Example: A biologist in Maui, Hawaii catches 30 chickens randomly, tags them and returns them to the wild they were in. A week later 20 chickens are caught in the same area and 8 have tags. Estimate the number of chickens on the island. 8 = 30 20 = p ~Cross Multiply to solve for the unknown variable (p) 8p= 600 This means there are 75 chickens on the island of Maui.

Population- the set of all individuals or objects studied

Sample: the part of the population that is studied if the entire population can't be used(is a subset of the population)

Statistics: a branch of mathematics dealing with the organization, collection, analysis and interpretation of information.

Random Sample:the way that every member of a population has an equal chance of being chosen.

Bias:When a sample is not a fair representaion of the population

This lesson stresses the importance of the basics for collecting data. Even though it is something we are always doing, knowing exactly what is happening can make analyzing that much easier. Avoiding being bias is always important too, because opinions rubbing off onto the data makes the data no longer accurate.


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