Unit 3 Review AP Stat

What is the response in this experiment?

"Does eating breakfast improve test score?"

• eating breakfast or not

• the grade you got on the test

• what time you get up in the morning

• what you eat for breakfast

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CCSS.HSS.IC.B.3

Diego wants to know how drinking milk affects how tall Dora grows. Which is the factor?

• Drinking milk.

• Diego's growth.

• Dora's growth.

• Chocolate or plain milk.

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CCSS.HSS.IC.B.3

A control group is important because...

• it is where you change the factor

• it is where you measure your results.

• it is used to add comparison

• it allows you to eliminate lurking variables

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CCSS.HSS.IC.B.3

Which of the following REDUCE VARIABILITY

• randomization

• control

• blinding

• blocking

• replication

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CCSS.HSS.IC.B.3

What does Randomization do for us in an experiment?

• Distributes lurking variables

• helps prevent confounding

• removes bias in assigning treatments

• provides replication

Tags

CCSS.HSS.IC.B.3

A experiment conducted by a Exxoff Gas randomly assigns 40 of its gas stations to two treatment groups. In one group of stations, employees will be rewarded with pizza if they are on time every day for a month. The other group of stations will have employees rewarded with $10 for being on time every day.

The experimental units are

• the gas stations

• the company

• the rewards

• the employees

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CCSS.HSS.IC.B.3

Confounding happens

• whenever lurking variables are present

• when there are only 2 treatments

• an observational study is completed instead of an experiment

• it cannot be determined which variable caused the response

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CCSS.HSS.IC.B.3

Which of the following is/are true about Blocking?

• It is not random

• It is based on a lurking variable

• It isolates lurking variables

• It creates homogeneous groups

• It reduces variability

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CCSS.HSS.IC.B.3

An experiment is conducted to see if people prefer backlight or not while watching tv. Fifty subjects are assigned to watch a show twice-once with and once without backlighting, The order is randomly assigned. This is

• A completely randomized design

• a randomized block design

• a matched pairs design- pairs of similar experimental units

• a matched pairs design- two treatments per experimental unit

• randomized control group design

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CCSS.HSS.IC.B.3

Which are possible goals of an experiment?

• Determine whether or not causation exists

• measure a response

• randomly assign people to treatments

• observe in the wild

Tags

CCSS.HSS.IC.B.3