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CATALYST 1. Pick up your quiz #3 from the front of your graded work folder. 2. Update your quiz tracker! 3. Catalyst: List some things that you have control over when you conduct an experiment.
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SCIENTIFIC INQUIRY CONTROLS & GATHERING DATA
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CONTROLS & GATHERING DATA 09.08.2008
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TYPES OF EXPERIMENTAL CONTROLS (1) 1) Experimental group versus Control groups Experimental group: treatment Control group : no treatment Control group is necessary for a comparison
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EXAMPLE OF TYPE 1 Study What are the effects of vitamin C supplements on the number of colds a person gets per year? Experimental Group Participants are given a vitamin C tablet Control Group Participants in this group are not given any vitamin tablet
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CONTROLS & GATHERING DATA 09.08.2008 Control Types 1.Experimental Group (treatment) vs. Control Group (no treatment) Ex. Vitamin C tablet vs. no tablet
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TYPES OF EXPERIMENTAL CONTROLS (2) 2) Control over the levels or values of the independent variable REMEMBER: Independent Variable: the variable you are able to CHANGE or CONTROL Dependent Variable: that you can measure which is affected by the independent variable
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EXAMPLE OF TYPE 2 Study What are the effects of vitamin C supplements on the number of colds a person gets per year? Independent Variable The variable that we can change is the vitamin C We can CONTROL or CHANGE the value of vitamin C Changing the amount in each tablet 250 mg, 500 mg, 1000 mg Giving the same independent variable to each participant
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CONTROLS & GATHERING DATA 09.08.2008 Control Types 1.Experimental Group (treatment) vs. Control Group (no treatment) Ex. Vitamin C tablet vs. no tablet 2.Control over levels/values of IV Ex. Amount of Vitamin C
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TYPES OF EXPERIMENTAL CONTROLS (3) 3) Control over the experimental setting Preventing extraneous variables
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EXAMPLE OF TYPE 3 Controlling the noise in an auditory perception experiment (how well people can hear)
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CONTROLS & GATHERING DATA 09.08.2008 Control Types 1.Experimental Group (treatment) vs. Control Group (no treatment) Ex. Vitamin C tablet vs. no tablet 2.Control over levels/values of IV Ex. Amount of Vitamin C 3. Control over exp. Setting Ex. Noise level in exp.
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TYPES OF EXPERIMENTAL CONTROLS (4) 4) Control Variable A potential independent variable that is held constant across conditions in an experiment.
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EXAMPLE OF TYPE 4 4) Control Variable Question: Does the mass of a pencil affect the time it takes to fall to the ground? Control Variable: You would drop the pencil from the same height for every experiment. Why?
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CONTROLS & GATHERING DATA 09.08.2008 Control Types 1.Experimental Group (treatment) vs. Control Group (no treatment) Ex. Vitamin C tablet vs. no tablet 2.Control over levels/values of IV Ex. Amount of Vitamin C 3. Control over exp. Setting Ex. Noise level in exp. 4. Control Variable – held constant/same in all trials Ex. Height of pencil in time vs. mass exp.
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The experimenter has an obligation to report ALL the results of an experiment, NOT just those that support his/her hypothesis. GATHERING DATA OBSERVE
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CONTROLS & GATHERING DATA 09.08.2008 Control Types Gatheri ng Data 3. Control over exp. Setting Ex. Noise level in exp. 4. Control Variable – held constant/same in all trials Ex. Height of pencil in time vs. mass exp. - Must report ALL data
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GATHERING DATA ORGANIZE Prepare a data table in your laboratory notebook A data table ensures consistency Makes it easier to analyze your results
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TIPS FOR TABLE MAKING Put a title at the top of every table Briefly describe what is contained in the table. Include a table number at the start of the table (such as Table 1.)
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CONTROLS & GATHERING DATA 09.08.2008 Control Types Gatheri ng Data 3. Control over exp. Setting Ex. Noise level in exp. 4. Control Variable – held constant/same in all trials Ex. Height of pencil in time vs. mass exp. - Must report ALL data - Create tables - Title @ top
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Use plain numbers. The units should go in the title instead of putting letters next to the numbers. Don’t skip lines. Label the columns and rows. TIPS FOR TABLE MAKING
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CONTROLS & GATHERING DATA 09.08.2008 Control Types Gatheri ng Data 3. Control over exp. Setting Ex. Noise level in exp. 4. Control Variable – held constant/same in all trials Ex. Height of pencil in time vs. mass exp. - Must report ALL data - Create tables - Title @ top - Label units @ top
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Keep all the units the same Example: instead of 2 min 30 sec, put 150 seconds Use decimals, not fractions. TIPS FOR TABLE MAKING
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CONTROLS & GATHERING DATA 09.08.2008 Control Types Gatheri ng Data 4. Control Variable – held constant/same in all trials Ex. Height of pencil in time vs. mass exp. - Must report ALL data - Create tables - Title @ top - Label units @ top - Keep all units same
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Need to have IV on left column & DV on right column! TIPS FOR TABLE MAKING
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CONTROLS & GATHERING DATA 09.08.2008 Control Types Gatheri ng Data 4. Control Variable – held constant/same in all trials Ex. Height of pencil in time vs. mass exp. - Must report ALL data - Create tables - Title @ top - Label units @ top - Keep all units same - IV on left; DV on right
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EXAMPLE 1 Hours of a Day Spent on Activities ActivityHours Sleep6 School6 Job4 Entertainment4 Meals2 Homework2 IV DV
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EXAMPLE 2 IV DV
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EXAMPLE 3 IV DV
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CONTROLS & GATHERING DATA 09.08.2008 Control Types Gatheri ng Data 4. Control Variable – held constant/same in all trials Ex. Height of pencil in time vs. mass exp. - Must report ALL data - Create tables - Title @ top - Label units @ top - Keep all units same
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PRACTICE (LEFT PAGE) Make a table that measures the number of people in this classroom that have a birthday in each month. YOU HAVE FOUR MINUTES TO GATHER THIS DATA.
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PRACTICE (LEFT PAGE) Make a table that measures the number of people in this classroom that have a birthday in each month. Birth Month# People in Class Jan. Feb. Mar. Apr. May June. July August Sept. Oct. Nov. Dec. IV DV TABLE 1: # People in Class w/ Certain Birth Months.
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SUMMARY Take 3 minutes to write a summary of today’s notes. When done, work on your homework packet!
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