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Biased Samples
Biased Questions
Using Samples to make predictions
Generating samples
dot and box plots
100
Which statement best describes a biased sample? A) It is very small B) It is not randomly chosen C)It results in incorrect predictions D) It does not accurately represent the population
What is D It does not accurately represent the population
100
Which of these questions is a biased question? A) What is your favorite color? B) Do prefer action movies or a comedy. C) Do you like is high tech computer or this out dated computer. D) Should the town build a skate park or a swimming pool?
What is C? It tries to convince you to pick the high tech computer.
100
A company did a random sample of computer chips. It found 2 out of 50 were defective. If the company made 500 computer chips, how many might be defective?
What is 20 computer chips?
100

In a shipment of 100 beach balls some are defective. The manufacturer generates a random sample of 20 balls. The integers 1 to 10 represent defective beach balls. 4 11 15 18 7 12 20 45 80 54 20 30 67 8 40 99 82 70 25 60 How many beach balls might be defective?

15 beach balls might be defective.

100
Find the median of the data. 5, 7, 2, 3, 1, 8, 5, 6, 4
What is 5?
200
Is the sample biased? Why or why not? In a survey about a new bike path, a random sample of dog walkers are ask.
What is biased, because not everyone walks dogs.
200
Is the question biased? Why or why not. What is your favorite book?
No, it is not trying to convince you to pick a certain book
200
A baker produces 1000 loaves of bread a day. A sample of 20 shows 3 do not meet quality control. Predict how many loaves do not meet quality control each day.
What is 150 loaves of bread?
200

In a shipment of 1000 backpacks some are defective. The manufacturer generates a random sample of 20 packs. The integers 1 to 100 represent defective packs. 34 121 150 345 678 213 50 432 200 101 232 824 950 87 300 432 134 71 375 990 How many might be defective out of 1000?

About 200 defective back packs.

200
What is the range of the data? 12, 15, 10, 13, 18, 15, 23, 15, 14
What is 11?
300
Is the sample biased? Why or why not. A principal wants to find out if her school needs more bike racks. A survey is taken of 30 students who ride the bus.
Yes it is biased, because not everyone takes the bus.
300
Is it a biased question? Why or Why not. Is green your favorite color?
Biased, because it leads you to pick green.
300
Target buys 15,000 ipads each month. A random sample of 100 ipads shows 4 are defective. Predict how many ipads might be defective each month.
What is 600 ipads?
300

In a shipment of 100 beach balls some are defective. The manufacturer generates a random sample of 20 balls. The integers 1 to 10 represent defective beach balls. 32 11 15 18 7 12 20 45 80 54 20 30 67 81 40 99 2 70 25 60 What percent might be defective?

What is 10%?

300

What is range? How do you find it?

The distance from the lowest to the highest data point. You find it by subtracting the two.

400
Recreate a sample so it is not biased. The city wants to know if the town want a new movie theater. The city asks random people at the bowling alley.
The city should call random people from a list of voters.
400
Rewrite the question so it is not biased. Should the town waste money on a new city hall?
Should the town build a new city hall?
400
A random sample of 30 students show that 5 students take the city bus home. How many students might take the city bus home out of 480 students.
What is 80 students
400

In a shipment of 1000 backpacks some are defective. The manufacturer generates a random sample of 20 packs. The integers 1 to 100 represent defective packs. 341 12 150 345 678 213 504 43 200 101 232 824 95 875 300 432 134 713 375 990 What percent might be defective?

What is 15%

400

What is the Median? How do you find it?

The middle point in the data. You need to list it in order from least to greatest and then cross off one number at a time from either side. If there are two numbers in the middle, you need to find the middle of those two numbers.