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Objective

Correctly design an experiment

Warm-Up

Write one hypothesis for this question.

1. Does the length of a person hair affect the color of their hair?

2. Does the height of a ramp affect how fast a HotWheels car will travel?

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Analysis and Conclusion

Scientific Inquiry

+Steps of the Inquiry Process

1. Make Observations

2. Ask Questions

3. Gather Research

4. Write a Hypothesis

5. Design Experiment

6. Gather Data/Experiment

7. Analyze Data

8. Draw Conclusions

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STEP 6: Experimenting and Gathering Data Data needs to be collected in a Data Table.

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A good data table will include the following: A title The IV and DV labeled The units in parentheses (grams, meters, etc.) An average for each trial

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STEP 7: Analysis of DataThis is done to show if the data collected supports your hypothesis or not.There are two ways your data should be analyzed:

With a Graph (bar, line, pie chart) With a written description of your graph

+How to Graph Data

1. Determine which type of graph is appropriate.

2. Determine which axis will be used for each variable

3. Label the axes with the variable names.

4. Number the graph

5. Plot the data points or create the bar graph.

6. Title the Graph

+1. Determine which type of graph is

appropriate.

Line Graph  - usually shows change over time

Bar  Graph  -  compares values or groups

Pie Graph - shows parts of a whole

Scatter Plot - shows trends

+2. Determine which axis will be used for each variable

The independent variable is always on the horizontal (bottom) axis.

The dependent variable (DV) always goes on the vertical axis.

+3. Label the axes with the variable names: include measurements in parentheses.

+4. Number the graph

+5. Plot the data points or create the bar graph

When making a line graph, don’t connect the dots with a line until you have plotted all the points.

When making a line graph, connect the points starting from left and working to the right. Don’t try to go backwards or try to connect the dots just because they are close to each other.

+6. Title the Graph

Decide what the graph is describing and title it so a reader will know what the purpose of the graph is. Include the independent and dependent variables in the

title.

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The written description of your graph should describe the relationship between the IV and DV and describe the data.

The more hours of sunlight the plants were exposed to the taller they grew. With no sunlight they barely grew and with 4 hours of sunlight they grew the most.

+Types of graphical relationships:

Positive Relationships:

+Types of graphical relationships:

Negative Relationships:

+Types of graphical relationships:

Zero/No Effect Relationships:

Potato Chips Eaten+

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Math

Test

Score

s

+Types of graphical relationships:

No Correlations Relationship:

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+Example:Graph the Following in Your Notebook. Then determine the relationship.

Average Weekly Television Watching in Hours

% Students Turning in HW

3 984 805.4 607.5 408 20

+Example

Average Weekly Television Watching in Hours

% Students Turning in HW

3 98

4 80

5.4 60

7.5 40

8 20

+Written Analysis

This is the “meat” of any lab report.

Summarize the data from your graphs and data tables to validate your arguments

Look for trends!!

This is the section worth the most of any lab that we do (hint hint)

Identify any experimental errors that would lead to fallacious data

Analyze WHY your got the results you did.

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STEP 8: Making a Conclusion A conclusion has several parts:

Restate your hypothesis Explain whether it was supported or not supported by

your data. Explain why the experiment was a success and what

should be improved upon. This will be fairly short compared to your analysis section.

+Basic Lab Report Format1. Title

2. Problem

3. Hypothesis

4. Experimental Design (variables chart, materials, methods)

5. Data (observations you made, data tables you created)

6. Analysis (written analysis and graphs)• REE, PE

7. Conclusion• PA