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Statistics
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17 slides

Statistics

Body text

Biased & Unbiased

• Population - an entire group

• Sample - a part of the population

• Random Sample - members of the population are chosen at random

• Convenience Sample - members of the population that are readily available

• BIASED SAMPLE - does not fairly represent the population.

Lets look at

Biased and Unbiased samples

Q. Ana wants to know the average student’s opinion of the tardy policy at her school. Which group of students should she survey in order to achieve the most accurate results?
thirty students who are often tardy
thirty students who are rarely tardy
thirty of her friends
thirty randomly selected students from her school
Q.

At an assembly 7 out of 10 students who entered the gym were carrying a backpack. Based on this information, if 700 students were at the assembly, how many students could be expected to be carrying a backpack?

49

490

210

421

Q.

To determine the most popular children’s programs, a television station asks parents to call in and complete a phone survey.

Biased Sample

Unbiased Sample

Q.

To evaluate the defect rate of its memory chips, an integrated circuit manufacturer tests every 100th chip off the production line.

Biased Sample

Unbiased Sample

Q. Define bias.
tolerance
two sided
in favor of one side
hate
Q. The quality of being believable or trustworthy is called?
Credibility
Evidence
Support
Cite
Q. A solid and reasonable argument that opposes or disagrees with your claim
claim
counterclaim
support
rebuttal
Q. What is an unbiased resource?
source not cited
unfair
cited source
neutral or fair;

Making inferences with collected data.

Subtitle

Making predictions based on data

• Random sampling

Q.

A

B

C

D

Q.

The Student Council asked every tenth student in the lunch line how they preferred to be contacted with school news. The results are shown in the table. Suppose there are 684 students at the school. How many can be expected to prefer E-mail? (just type in the number)

304
Q.

A bank randomly surveyed 50 of its customers by mail to find out how customers use its mobile banking service. The survey found that only 11 of the 50 customers used the service.

If the branch has 1,700 customers, about _____ customers use the mobile banking service.

*Only type in the numerical answer.

374
alternatives
Q.

Zoie completes a report by asking 70 students across campus. She found that 48% of CIAA students do not wash their hands after using the bathroom. What is the sample size?