Scientific Method Overview Quiz

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Questions and Answers

What term describes the degree of error of a measuring device?

  • Error bars
  • Theory
  • Law
  • Uncertainty (correct)

A hypothesis is the starting point for scientific investigation.

True (A)

Identify the variable that can be controlled during experimentation.

Controlled variable

Data that describe physical characteristics involve the use of __________.

<p>senses</p> Signup and view all the answers

Match the following types of data with their examples:

<p>Length of a cell in micrometers = Quantitative Change of scent of a chemical compound = Qualitative Stem length in centimeters of the plant = Quantitative Color of a liquid = Qualitative</p> Signup and view all the answers

What is the organized process that scientists use to solve investigation problems?

<p>Scientific method (B)</p> Signup and view all the answers

Qualitative data can be represented using numerical values.

<p>False (B)</p> Signup and view all the answers

What methodology is used to test a hypothesis in an organized manner?

<p>Scientific method</p> Signup and view all the answers

What is the independent variable in the investigation related to recycled plastic?

<p>Countries (D)</p> Signup and view all the answers

Brazil has the highest percentage of recycled plastic among the countries mentioned.

<p>False (B)</p> Signup and view all the answers

What is the dependent variable in the investigation?

<p>Percentage of recycled plastic in different countries</p> Signup and view all the answers

The difference in the percentage of recycled plastics between South Korea and Mexico is ____%.

<p>43</p> Signup and view all the answers

Match the following steps of the scientific method with their correct order:

<p>A. Observations = 1. First step B. Questions = 2. Second step C. Hypothesis = 3. Third step D. Experimentation = 4. Fourth step E. Results = 5. Fifth step F. Conclusion = 6. Sixth step</p> Signup and view all the answers

Which of the following is a controlled variable in the investigation on plant growth?

<p>Type of plant (A)</p> Signup and view all the answers

In this investigation, the hours of sun exposure represent the dependent variable.

<p>False (B)</p> Signup and view all the answers

List one controlled variable in the plant growth investigation.

<p>Type of plant (or pots, days, months)</p> Signup and view all the answers

Flashcards

Error bars

A visual representation of the degree of error or uncertainty associated with a measurement.

Hypothesis

A proposed explanation for an observation or question that can be tested.

Dependent variable

The variable that is measured in an experiment.

Independent variable

The variable that is intentionally changed or manipulated in an experiment.

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Qualitative data

Data that describes qualities or characteristics, often based on observations of senses.

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Quantitative data

Data that can be measured and expressed numerically.

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Scientific method

A systematic approach used by scientists to investigate and answer questions.

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Experimentation

Testing a hypothesis in a controlled setting or environment.

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Controlled Variable

A factor that is kept constant throughout an experiment to ensure that the results are due to the independent variable only. It remains unchanged for all experimental subjects.

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What is the purpose of the Scientific Method?

The scientific method is a systematic way of asking questions, testing hypotheses, and gathering evidence to understand the world around us. It helps us make logical conclusions about the world based on evidence.

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What are controlled variables in the plant experiment?

In the plant experiment, the controlled variables include the type of plant, the size of the pots, and the duration of the experiment (2 months). These factors are kept the same for both plants to ensure a fair comparison.

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What is the independent variable in the plant experiment?

The independent variable is the duration of sunlight exposure, with one plant getting 6 hours and the other 2 hours of sunlight per day. Scientists change this factor to study its impact on plant growth.

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What is the dependent variable in the plant experiment?

The dependent variable is the growth of the plant, measured in centimeters. This is what is being observed and measured as a result of the change in sunlight exposure.

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What is the difference between quantitative and qualitative data?

Quantitative data is numerical data that can be measured and expressed as numbers, while qualitative data describes qualities or characteristics using words, observations, and descriptions.

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Study Notes

Scientific Method

  • Steps in the scientific method include observations, questions, hypothesis, experimentation, results, and conclusions.

Variables

  • Independent variable: Factor being tested (e.g., hours of sunlight)
  • Dependent variable: Measured factor (e.g., plant growth)
  • Controlled variable: Factors kept the same (e.g., type of plant, pots)

Data Types

  • Qualitative data: Describes characteristics (e.g., color change)
  • Quantitative data: Uses numbers (e.g., length in cm, micrometers)

Scientific Investigation

  • A scientific investigation is a step-by-step process scientists use to solve problems.

Measuring Device Error

  • Error bars or uncertainty describe the degree of error in a measuring device.

Scientific Method (Specific Example)

  • An example investigation: measuring plant growth based on different sunlight exposure times.
  • Dependent variable: Growth of a plant in cm
  • Independent variable: 6 and 2 hours of sun per day
  • Controlled variable: Type of plant, pots, days, months

Recycled Plastic Percentage

  • Countries and Percentage of recycled plastic were investigated
  • Independent variable: Country
  • Dependent variable: Percentage of recycled plastic
  • Lowest percentage of recycled plastic country: Brasil

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