What is Statistics??. Two trains are traveling toward each other on the same track, each at 60 miles...
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Transcript of What is Statistics??. Two trains are traveling toward each other on the same track, each at 60 miles...
Is it this????
Two trains are traveling toward each other on the same track, each at 60 miles per hour. When they are exactly 120 miles apart, a fly takes off from the front of one of the trains, flying toward the other train……….
Is it this????
Two trains are traveling toward each other on the same track, each at 60 miles per hour. When they are exactly 120 miles apart, a fly takes off from the front of one of the trains, flying toward the other train……….
NUMBERS
Weight
Salary
Facebook Friends
Cell phone minutes
Time spent in traffic
Number of Tweets
Cholesterol Level
Cost of Haircut
CATEGORIES
Favorite movie
Male/FemalePolitical Affiliation
Pepsi/Coca Cola Drinker
Type of car you driveiPhone owner or not
Mac/PC User
Tattooed or not
What percentage of teenagers have tattoos?
If the Presidential election was held today, what percent of voters would vote for the candidate that you support?
To answer these questions data are collected from a small sample
Some teenagers
All teenagers
and used to represent a much larger group.
In statistics, we learn how to design experiments that are used to determine cause and effect relationships.
Can the dog really pick out someone with cancer or was the dog just lucky?
If the dog couldn’t detect lung cancer, we would still expect him to be right some times.
.
Statistics helps us to quantify ideas like this.
How many times would the dog have to be right for us to believe he was not just lucky?