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Statistics An Overview
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What is Statistics? “People who eat three daily servings of whole grains have been shown to reduce their risk of stroke by 37%.” “Seventy percent of the 1500 U.S. spinal cord injuries to minors result from vehicle accidents, and 68 percent of those injured were not wearing a seatbelt”
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Even more interesting…
Being unmarried can shorten a man’s life by ten years In New York City, approx. 1,600 people are bitten by other humans annually The average four year-old child asks over four hundred questions daily. 1 out of 4 kids in the USA is overweight A blink lasts approximately 0.3 seconds Girls have more taste buds than boys
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How do we get that??? Data Example
Consist of information coming from observations, counts, measurements, or responses Example How much sleep do high school students get at night?
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Mmmm Data Population Sample
The collection of all outcomes, responses, measurements, or counts that are of interest Sample A part of a population
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What do we do with data??? Statistics
Is the science of collecting, organizing, analyzing, and interpreting data in order to make decisions.
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Lets display data Ways to display data: Scatter Plot
Histogram (Bar Graph) Stem and Leaf Plot Box and Whisker Plot Pie Chart
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Today… Histograms Graph groups of numbers according to how often they appear 6 1,2,2,3,3,3,3,4,4,5,6 4 Times appearing 2 1-2 3-4 5-6 Group of numbers
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Try it out… Class Grades: Grade # of Students A 5 B 8 C 3 D E 1
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