Presentation on theme: "The Nature of Science Living Environment. What is Science? Science: knowledge based on the study of nature Theory: explanation of a natural phenomenon."— Presentation transcript:
What is Science? Science: knowledge based on the study of nature Theory: explanation of a natural phenomenon supported by many observations and experiments over time
The Scientific Method 1.State the problem or question 2.Research the problem or question 3.State the hypothesis 4.Test the hypothesis (Do the experiment) 5.Collect data 6.Make sense of the results (Analyze) 7.State the conclusions 8.Repeat the work
The Scientific Method 1.State the problem or question Will a bean plant grow taller in direct sunlight?
The Scientific Method 2.Research the problem or question You might find a gardener for advice on varieties and growing conditions.
The Scientific Method 3.State the hypothesis Hypothesis: a testable explanation of a situation If bean plants are planted in direct sunlight, then they will grow taller than bean plants planted in indirect sunlight.
The Scientific Method 4.Test the hypothesis (Do the experiment) Control group: group used for comparison (“the normal”) Beans grown in partial sunlight Experimental/Variable group: group exposed to the factor being tested Beans grown in direct sunlight
The Scientific Method 4.Test the hypothesis (Do the experiment) Independent variable: factor that is being changed (manipulated) Amount of sunlight Dependent variable: factor that is being measured Height of bean plant Constant: factor that remains the same (fixed) Amount of water, pH of soil, quality of dirt, etc.
The Scientific Method 5.Collect the data –Data: information gained from observations Record observations and measurements in a data table –Record height of bean plants in data table.
The Scientific Method 6.Analyze the results Create graphs to look for patterns in the data Look for possible errors –Plot bean plant height vs. time
The Scientific Method 7.State the conclusion Summarize findings from the analysis of data collected –Bean plants grow taller in direct sunlight.
The Scientific Method 8.Repeat the work Conduct the experiment again to verify results
Validity & Reliability What can increase the validity & reliability of an experiment?? 1.Large sample size 2.Repeating the experiment 3.Peer review Peer review: process by which, procedures used during an experiment and the results are evaluated by other scientists who are in the same field and conducting similar research