Experimental Design Practice, Part 2 (Mc Kowen) PDF

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Experimental Design Notes to studying for midterms and finals, because you definitely need to review to do well in Mr. Johnson's class...

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Name: Alexis Williams Period: 3 Date: 9/25

Experimental Design Practice, Part 2 Designing an experiment: Choose a question from your observation/sketching activity - or, if you cannot think of one, choose one from the list below - to investigate. Make a hypothesis to answer your question. Explain what relationship your hypothesis would test. Design an experiment that would give you the data you need to support or reject your hypothesis. Questions (highlight one only; if you are choosing a question from your observation activity, type that question on the line): ❏ Question from Observations Activity: How does the amount of water aloe gets affect its inside? ❏ What causes some students to be sleepy in 1st and 2nd period? ❏ What makes some tomatoes taste sweeter than others? ❏ Are dogs affected by caffeine? ❏ Which material makes the fastest swimsuit? ❏ Which factors affect the color of a rose?

Title: The Effect of the Amount of Water an Aloe Plant Gets on the Amount of Gel Inside One Leaf. *The Effect of ____(IV)____ on ______(DV)______”

Hypothesis: If the amount of water an aloe plant gets is increased then the amount of gel inside will increase as well because a good portion of the gel is made up of water and if the plant gets more water then there will more ‘supplies’ to make more gel. *Include if/then/because; in other words, what should happen and why?

Independent Variable: The amount of water in a week (mL) Level of Independent Variable

Control Group? 0mL

Group 1: 60mL

Group 2: 180mL

Group 3: 300mL

Number of Trials in Each Group

5

5

5

5

Dependent Variable: Amount of aloe in a leaf. (mL) (I’ll measure once each trial) *include the units that you would use to measure your DV and, if applicable, how often you will measure

Constants: 1. Size of aloe leaf I use

4. Type of Soil

2.

Amount of Sunlight

3.

Same size pot

5. Type of aloe plant 6. Number of days before measuring

Experimental Design Practice - Giving Feedback ** You will provide this feedback through Canvas; however, please use the information below to guide you in offering that feedback ** Experiment Validity: Evaluate another student’s experiment using the checklist below. ❏ ❏ ❏ ❏

ONE variable is being tested in this experiment. Other variables are held constant. The data collected will help determine if the hypothesis is valid. There are sufficient trials and groups to make the data trustworthy.

Validity Feedback:  Explain what was done well. Explain what needs to be changed to make the experiment more valid.

Other Feedback: Are there any other factors that could affect the dependent variable? What other relationships could be tested to determine the answer to the original question?...