Scientific Method Final

Carmen conducted an experiment to determine if listening to different types of music would affect a person’s pulse. Her hypothesis was that pulse rate would change with different types of music. Each person listened to seven different selections of music for 30 seconds each. Each person’s pulse was taken before the music and then after each 30-second interval of music. The pulses were taken again after the music selections were completed. Based on her experiment, Carmen concluded that a person’s pulse rate changed when the person listened to different types of music.  Which component is missing from Carmen’s experiment?

• a question
• a hypothesis
• a control group
• a description of the experiment

In order to be accepted, a scientific theory must be

•  widely tested and supported by extensive data
•  based on the results of a single experiment
•  controversial and cause debate
•  in line with all previous historical ideas

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NGSS.HS-LS4-1

In an appropriately designed experiment, a scientist is able to test the effect of

•  a single variable
•  multiple variables
•  the hypothesis
•  scientific observations

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NGSS.MS-ETS1-4

An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and group B was given caffeine-free soda. One hour after drinking the soda, the pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda. The dependent variable in this experiment is the

• type of soda given to each group
• amount of soda given to each group
•  pulse rate of each group
• age of participants in each group

What is the first step in completing the scientific method?

• Form a hypothesis

• Design a controlled experiment

• Make observations and ask questions

• Draw conclusions

What is the independent variable?

• The variable that is not changed

• The variable that is being observed

• The variable that you purposely manipulate (change)

• The variable that responds to the change (measure)

What is the dependent variable?

• The variable that does not change

• The variable that you purposely manipulate (change)

• The variable that is kept constant on purpose

• The variable that responds to the change (measured)

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

What is the most basic unit of life?

• cell
• tissue
• organ
• organ system

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NGSS.MS-LS1-1

NGSS.MS-LS1-2

Maintaining a stable internal

environment is called

• homeostasis

• equilibrium

• balance

• evenness

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NGSS.HS-LS1-3

When you step out into the cold, your body shivers in order to keep its temperature at 98.6F. Which characteristic of life does this represent?

• All living things use energy

• All living things contain cells

• All living things maintain homeostasis

• All living things grow

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NGSS.HS-LS1-3