Experimental Design AP Stat

The type of variable that responds to the experiment and is what you measure to determine if your hypothesis is true.

• Independent
• Dependent
• Control

Tags

CCSS.HSS.IC.B.5

If I water the plant more often, then it will grow taller.  Name the independent variable.

• The height of the plant
• The size of the pot
• The amount of water
• The amount of light.

If I water the plant more often, then it will grow taller.  Name the dependent variable.

• The amount of water.
• The amount of soil.
• The height of the plant.
• The amount of water.

Tags

CCSS.HSF.IF.B.4

CCSS.HSF.IF.C.7

Changeable elements of an experiment which can affect the outcome of the experiment if not carefully controlled are called:

• placebos
• variables
• quantitative elements
• control groups

Tags

CCSS.HSS.IC.B.5

An Advanced Algebra teacher gives out a study guide before the test. The teacher lists the students who completed their study guide and compares their scores to the remaining Advanced Algebra students’ scores.

• Observational Study

• Experimental Study

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

To determine whether sugar affects an athlete’s performance at practice, Coach Barron gave half the team doughnuts for breakfast and the other half whole grain cereal. He compared the two groups in terms of endurance and energy. This is an example of:

• Observational Study

• Experimental Study

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

Which of the following questions is unbiased?

• Have you tried those nasty new flavors of Lays potato chips?

• Do you think the government should be able to spy on all of your private text messages?

• What was the score of the football game last Friday?

• Do you think our awesome principal is a great leader for our school?

Which question is biased?

• Do you prefer flip flops or sandals?

• Should we be required to wear school uniforms?

• Do you think a Wal-Mart should be built in town?

• Do you prefer Taylor Swift or the scandalous Miley Cyrus?

The Women's Health Study randomly assigned nearly 40,000 women over the age of 45 to receive either aspirin or a placebo for over 10 years to examine the effect of aspirin on cancer risk to healthy women. This long-term trial was best conducted as:

• a census.

• an observational study.

• a randomized comparative experiment.

• a single-blind randomized comparative experiment.

• a double-blind randomized comparative experiment.

Tags

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.5

In the previous problem, supposed that the researchers suspected that women over the age of 55 may respond differently to the treatment. Given that a random sample of 40,000 women over the age of 45 has already been chosen, the study would have been improved by:

• a stratified sample, with strata determined by age.

• a stratified sample, with strata determined by gender.

• a block design, with blocks determined by age.

• a block design, with blocks determined by gender.

• a double-blind completely randomized design.

Tags

CCSS.HSS.IC.A.1

CCSS.HSS.IC.B.3

CCSS.HSS.IC.B.4