populations and samples. warm ups #1 jaoquin is ordering 5 identical sandwiches and a bag of chips....
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POPULATIONS AND SAMPLES
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WARM UPS
#1 Jaoquin is ordering 5 identical sandwiches and a bag of chips. The bag of chips costs $1.25 and the entire order costs $38.75. Write an equation you can use to find the price of a sandwich.
#2 Charlene is a writer who is going on a trip. She has brought several copies of her latest book in her suitcase. The suitcase itself weighs 5 pounds and each book weighs 3 pounds. If her full suitcase can weigh no more than 50 pounds, how many books can she bring? (Hint: This is an inequality problem.)
Write an equation/inequality and solve. No calculators.
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WARM UPS
#1 Jaoquin is ordering 5 identical sandwiches and a bag of chips. The bag of chips costs $1.25 and the entire order costs $38.75. Write an equation you can use to find the price of a sandwich.
One sandwich costs $7.50.
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WARM UPS
#2 Charlene is a writer who is going on a trip. She has brought several copies of her latest book in her suitcase. The suitcase itself weighs 5 pounds and each book weighs 3 pounds. If her full suitcase can weigh no more than 50 pounds, how many books can she bring? (Hint: This is an inequality problem.)
Each book can weight at most 15 pounds.
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Populations and Samples
Population: A group, entire group of objects, individuals or events.
Sample: A part of the population.
Random Sample: A sample in which every person, object, or event has an EQUAL chance of being selected.
Biased Sample: A sample that does not accurately represent the population.
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For both examples, identify the population (who is the group that she wants to know about?) Determine whether each sample is random or biased.
Example #1Roberto wants to know the favorite sport of adults in his hometown. He surveys 50 adults at a baseball game.
Example #2Paula wants to know the favorite type of music for students in her class. She puts the names of all students in a hat, draws 8 names, and surveys those students.
Population: Adults in Robert’s hometown.
Sample: Biased. People who don’t like baseball will not be represented in the sample.
Population: Students in Paula’s class.
Sample: Random. Each student has an equal chance of being selected.
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Yes, every employee had an EQUAL chance of being selected.
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Bias in Survey Questions
Make sure that they survey questions do not sway people to respond a certain way.
In Madison County, residents were surveyed about a new skateboard park. Determine whether each survey question may be biased. Explain.
Example #1Would you like to waste the taxpayers money to build a frivolous skateboard park?
Example #2Do you favor a new skateboard park?
Example #3Studies have shown that having a safe place to go keeps kids out of trouble. Would you like to invest taxpayers money to build a skateboard park?
Biased. It discourages residents from saying yes to a new sports park by implying it is a waste of money.
Not biased. It does not include an opinion on the skateboard park.
Biased. It leads people to say yes because it mentions having a safe place for kids to go and stay out of trouble.
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Biased because cats are suggested.
Not biased because it does not lead people to pick a particular season.
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CLASSWORK/HOMEWORK:GO MATH! P. 315 #6-14.
QUIZ ON FRIDAY APRIL 24Populations, Samples and Inferences (10.1 & 10.2)