1. Bell Work 1 SPI 0807.Inq.1 (Variables and Controls) Aug 16, 2013 Congratulations! You have been hired to conduct experiments to determine which gaming system can process game images the fastest. In one experiment you will play X-Box games for one hour. In the next experiment you will play Wii games for one hour In the third trial you will play Playstation games for one hours. 1) In this experimental setup, what is the independent variable? In other words, what is the one and only one thing changed each time the experiment is duplicated? Press the Right Arrow Button to Advance through the Presentation! Slide 1

2. Bell Work 1.5 SPI 0807.Inq.1 (Variables and Controls) Aug 16, 2013 Congratulations! You have been hired to conduct experiments to determine which gaming system can process game images the fastest. In one experiment you will play X-Box games for one hour. In the next experiment you will play Wii games for one hour In the third trial you will play Playstation games for one hours. 1) In this experimental setup, what is the independent variable? In other words, what is the one and only one thing changed each time the experiment is duplicated? Slide 1.5 The independent variable is the gaming system (X-box. Wii, and Playstation)

3. In an experiment…  …you should only test for ONE key thing at a time When you repeat the experiment…  …only change this ONE key thing This one thing is called… Notes SPI 0807.Inq.1 (Variables and Controls) 3 Independent Variables Slide 3

4. Example 02: So…what is the independent variable in this example? In other words, what is the one thing YOU would change each time you repeat your experiment? A scientist is conducting an experiment to test how sunlight affects plant growth.  She places one corn plant 1 meter away from a sunlamp.  She places one corn plant 2 meters away from a sunlamp.  She places one corn plant 3 meters away from a sunlamp. SPI 0807.Inq.1 (Variables and Controls) The independent variable is the distance from the sunlamps which is connected with the amount of sunlight. Slide 4 Review

5. Example 03: So…what is the independent variable in this example? In other words, what is the one thing YOU would change each time you repeat your experiment? A student conducts an experiment with ten 8th grade students. He uses 3 similar types of sour candy (Sour Skittles, Sour Patch Kids, and Warheads) in a series of 4 trials. He gives 1 piece of candy to each student and records their facial expressions as they eat it. SPI 0807.Inq.1 (Variables and Controls) The independent variable is the type of sour candy Slide 5 Review

6. Example 04: A student conducts an experiment to determine which type of glue works best for attaching two pieces of regular writing paper together. She uses 3 types of Elmer’s glue in a series of experiments. (1) Liquid-washable, (2) Glue Stick-washable, (3) Glue Stick-nonwashable) She places the same amount of glue (2g) on each sheet of paper. SPI 0807.Inq.1 (Variables and Controls) The independent variable is the type of glue So…what is the independent variable in this example? In other words, what is the one thing YOU would change each time you repeat your experiment? Slide 6 Review

7. Example 05: A student conducts an experiment to determine which ink color in ballpoint pens will last the longest before running out. She uses 3 ink colors in 3 ballpoint pens in a series of experiments. (1) Black ink pen, (2) Blue ink pen, (3) Red ink pen) She copies text from her science book. She copies the same text over and over. She writes at the same speed. The room temperature remains the same. She writes on the same kind of paper. SPI 0807.Inq.1 (Variables and Controls) The independent variable is the color of ink So…what is the independent variable in this example? In other words, what is the one thing YOU would change each time you repeat your experiment? Slide 7 Review