# Experimental Design Practice Worksheet

```Name ______________________________
Period ____________
Science Skills Review / Experimental Design Practice
Mr. Smith thinks that a special juice will increase the productivity of his workers. He creates two groups of 50
workers and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group
A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Smith
counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113
stacks.
Directions: For each of the following identify the:
1. Control Group2. Experimental Group3. Independent Variable (the thing that Smith changes)4. Controls (the things that Smith leaves the same)5. Dependent Variable (the thing that you observe/keep data on)6. What should Smith's conclusion be?
John notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice
will get rid of the green slime. John decides to check this this out by spraying half of the shower with coconut
juice. He sprays the other half of the shower with water. After 3 days of &quot;treatment&quot; there is no change in the
appearance of the green slime on either side of the shower.
1. State the problem that John is trying to figure out.
2. Independent Variable (the thing that John changes)
3. Controls (the things that John leaves the same)
4. Dependent Variable (the thing that you observe/keep data on)
5. What should John’s conclusion be?
Mr. Plinkett was told that a certain cleaner was the new best cleaner on the market, it even claims to clean
messes 50% faster. Interested in this product, he buys the cleaner and compares it to his usual product. One
test group (A) is cleaned with the original cleaner, and another test group (B) was cleaned with the
experimental cleaner. Group A was cleaned in 30 minutes, while group B was cleaned in 20 minutes.
Identify the1. Control Group2. Experimental Group3. Independent Variable (the thing that Mr. Plinkett changes)
4. Controls (the things that Mr. Plinkett leaves the same)
5. Dependent Variable (the thing that you observe/keep data on)
6. What should Mr. Plinkett’s conclusion be?
Sally is working on a science project. Her task is to answer the question: &quot;Does Hair B Quick, a commercial hair
product, affect the speed of hair growth&quot;. Her family is willing to volunteer for the experiment. Create an
experiment that could help to answer this question. Include and identify a control group, experimental group,
variable and a conclusion.
1. Control Group2. Experimental Group3. Independent Variable (the thing that Sally changes)
4. Controls (the things that Sally leaves the same)
5. Dependent Variable (the thing that you observe/keep data on)
6. What should Sally’s conclusion be?
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