Scientific Method

The Scientific Method

  • The Scientific Method is a systematic approach to investigate natural occurrences.

  • Steps in the Scientific Method:

    • Problem/Question: Develop a question or problem that can be tested through experimentation.

    • Observation/Research: Make observations related to the topic and conduct background research.

Detailed Steps of the Scientific Method

Step 1: Problem/Question

  • Formulate a question that can be answered through experimentation.

Step 2: Observation/Research

  • Collect information and learn about the topic through observation and research.

Step 3: Formulate a Hypothesis

  • Predict a possible answer to the problem or question.

    • Example: "If soil temperatures rise, then plant growth will increase."

Step 4: Experiment

  • Develop a clear and detailed procedure, listing all materials needed.

  • Ensure outcomes are measurable (quantifiable).

Step 5: Collect Data and Analyze Results

  • Gather data during the experiment and modify the procedure if necessary.

  • Confirm results by retesting and include visual data like tables and graphs.

Step 6: Conclusion

  • State whether the hypothesis is accepted or rejected based on experimental results.

  • Recommend further studies and improvements to the procedure.

Step 7: Communicate the Results

  • Be ready to present findings to an audience and answer questions.

Example Scenario: John’s Bread Experiment

Problem/Question

  • John observes his grandmother baking bread and questions what makes the bread rise.

  • He wonders if the amount of sugar affects the size of the bread loaf.

Observation/Research

  • John researches baking and fermentation, documenting information in a journal.

Formulate a Hypothesis

  • After further research, he hypothesizes: "If more sugar is added, then the bread will rise higher."

  • Hypothesis Definition: An educated guess about the relationship between independent and dependent variables.

Variables Explained

Independent Variable

  • The independent variable is manipulated by the experimenter. John uses different amounts of sugar (25g, 50g, 100g, 250g, 500g).

Dependent Variable

  • The dependent variable is measured during the experiment, which is the size of the bread loaf.

Experiment Design

Control Group

  • The control group acts as a standard of comparison, using the amount of sugar his grandmother typically used (50g).

Constants

  • Constants are all factors kept the same to ensure valid results, including:

    • Other ingredients, oven type, rising time, brand of ingredients, cooking time, type of pan, environmental conditions, oven temperature, age of yeast.

Trials

  • Trials refer to replicate groups; John will perform three trials for each sugar amount.

Data Collection and Analysis

  • John creates a table to record data on loaf size based on different sugar amounts.

Results Summary

  • John observes results from his initial trials and finds the control group produced the best results, although not significantly better than 100g of sugar.

  • He concludes that his initial hypothesis is rejected and intends to test further using sugar amounts between 50g and 100g.

Final Experiment

  • In a follow-up experiment, John records:

    • 50g: Average size 1344 cm³

    • 70g: Average size 1612 cm³ (largest loaf).

Conclusion

  • John accepts the hypothesis that 70g of sugar yields the largest loaf and prepares to communicate the findings to his grandmother and the class.