Exploring Variables and Hypotheses in the Scientific Method

The video tutorial explains how to formulate scientific questions by identifying independent and dependent variables. It provides examples to illustrate these concepts and guides viewers on how to create hypotheses using if-then statements. The tutorial emphasizes the importance of making specific predictions and offers practice scenarios to reinforce learning.

What are the two key components identified by a scientific question?

• Observation and inference

• Independent and dependent variables

• Control and experimental groups

• Hypothesis and conclusion

Which variable is chosen to be changed in an experiment?

• Independent variable

• Extraneous variable

• Dependent variable

• Control variable

In the example given, what is the independent variable?

• Sunlight

• Soil type

• Water

• Plant growth

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What is the dependent variable in the water and plant growth example?

• Plant growth

• Soil quality

• Type of plant

• Amount of water

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which variable is measured to determine the results of an experiment?

• Extraneous variable

• Independent variable

• Control variable

• Dependent variable

In the example of studying and test scores, what is the dependent variable?

• Number of subjects

• Test scores

• Type of test

• Study time

What is the independent variable in the example of caffeine and blood pressure?

• Blood pressure

• Heart rate

• Caffeine

• Sleep duration

What is a hypothesis?

• A random guess

• A statement that makes an educated guess to answer a scientific question

• An observation

• A proven fact

Which format is commonly used to write a hypothesis?

• When-then statement

• If-then statement

• Because-therefore statement

• Since-hence statement

What is a suitable hypothesis for the question: 'How does studying affect test scores?'

• If I study, then I will have less free time

• If I study, then I will be tired

• If I study, then my test scores will increase

• If I study, then I will need more books