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Data Management

Data Management. Topic #1.1 Variables & Relationships. Outcomes A2 – Analyze graphs or charts of situations to identify specific information C10 – Describe real-world relationships depicts by graphs, tables of values and written descriptions. Think about it….

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Data Management

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  1. Data Management Topic #1.1 Variables & Relationships Outcomes A2 – Analyze graphs or charts of situations to identify specific information C10 – Describe real-world relationships depicts by graphs, tables of values and written descriptions

  2. Think about it… • Tree farming is an important business in Atlantic Canada. Tree farmers want to make sure that each year there are enough Christmas trees of the right size to sell. When tree farmers try to predict the size of trees, they must consider the factors that affect growth. • Questions: • Why is it important to predict the size of trees from year to year? • How are Christmas trees priced? • How can this help the farmer to predict income?

  3. Mind Mapping • Visual graphics that show relationships between factors.

  4. Adequate rainfall increases growth Lightning can cause forest fires Pollution from cars can slow growth Add the following 4 factors to the mind map below:Wind speed;Number of pests that live in the trees;Amount of space that the trees have in which to grow;Number of people available to tend the tree farm • Add at least 2 other factors you can think of that can affect tree growth.

  5. Which factors can the farmer control?

  6. Types of Variables Independent variable: A factor that affects another factor in an experiment or a relationship. Dependent Variable: The factor that is affected by the other factors in an experiment of a relationship. It can be thought of as the result or “what you measure”. This “depends” on what you did to it. For example: How well you do on a test might depend on the number of classes you attended, how much you participated in the class activities, or how long you studied for the test. In this example, what you measure (the result) is your test score. It is the DEPENDENT VARIABLE. What you did to achieve your test score (attending class, participating in class activities and length of time studying) are the INDEPENDENT VARIABLES.

  7. Control Variables • In order to know exactly how one particular variable will affect another, you must hold all other possible variables constant. • You must make sure that only one variable changes during an experiment and everything else is kept the same. • All the other factors that might possibly affect the results of your experiment are known as “CONTROL VARIABLES”. • For example, if you want to know what affect light will have on the growth of tomato plants, WHAT WOULD YOU DO?

  8. Control Variables • What did you suggest? • Grow many plants (e.g. 10 plants) • Use 10 identical pots, • Add exactly the same amount and type of soil to each pot, • Plant the same number and type of seeds in each pot, • Add the same type and amount of fertilizer to each pot, and • Water the pots with the same amount of water. • The ONLY thing that should be different is the amount of light you expose each of the plants to during the experiment. • That way you will know that any difference between the plants is caused by the different light conditions and not some other variable.

  9. Journal Entry #1 • Write a reflection on your understanding of variables. • Describe at least one other the real-world cause-and-effect relationship. • Identify the independent, dependent and control variables.

  10. Check you Understanding #1 • Identify the independent and dependent variables in each of the following

  11. Check you Understanding #1 • Complete the following table:

  12. Check you Understanding #1 • Ski jumping is a popular event at the Winter Olympic Games. The following factors may affect the distance a skier jumps: • Length of the ramp; • Force with which the skier pushes to start; • Wind speed; • Wind direction; • Model of the skis; • Slope of the ramp. • Draw a mind map to illustrate the relationships between the dependent and the independent variables.

  13. Check you Understanding #1

  14. Scotch Pine, 2.6m, $55 Douglas Fir, 2.4m, $25 White pine, 2.4m, $35 Douglas Fir, 2.2m, $20 White pine, 2.2m, $25 Scotch Pine, 2.2m, $40 Douglas Fir, 2.0m, $15 White pine, 2.0m, $20 Scotch Pine, 2.0m, $30 Check you Understanding #1 • Taylor wants to see how the prices of various types of trees depend upon the height.

  15. Example of your bar graph…

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