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Biased Samples
Biased Questions
Using Samples to Make Predictions
Percentages
Dot and Box plots
100

Which statement best describes a biased sample? A) It is very large B) It is 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) What is your favorite movie? C) Do you like this high tech computer or this out dated computer. D) Should the town build a skate park?

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 2 are defective. What percentage of the beach balls are defective?

2%

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 bikers are asked.

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 4 are defective. What percentage of the backpacks are defective.

0.4%

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 phones, 6 out of 50 phones are defective. What percentage of the phones are defective?

What is 12%

300
What is the range? Lower Extreme: 5 Lower Quartile: 12 Median : 15 Upper Quartile: 17 Upper Extreme:21
What is 16?
400

Is the following biased or unbiased. The city wants to know if the town want a new movie theater. The city asks families 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 150 are defective. What percentage of the backpacks are defective. 

What is 15%

400
What is the Inner Quartile Range? Lower Extreme: 40 Lower Quartile: 44 Median:53 Upper Quartile: 60 Upper extreme: 65
What is 16?