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I could buy a sunflower seed packet from grocery outlet. I open the packet finding 7 sunflower seeds inside. I plant 3 sunflower seeds in 3 pots of soil and plant the other 3 sunflower seeds in 3 pots of sand. I also will water each plant every day and ensure each plant has the same amount of sunlight. Then I can measure the height of the sunflowers after one month.

What are the treatments in your experiment?
The treatment would be the soil or sand the plants grow in.

What is the response variable in your experiment?

The response variable in my experiment is the amount of plant growth

Where in your experiment would random selection occur?
Random selection occurs when the plants are chosen (from the location you are getting your plants from).

Where in your experiment would random assignment occur?
Random assignment occurs when the plants are assigned to solid or sand.

1 answer

Your experiment is well-structured and clearly outlines the key components. Here’s a breakdown of your findings and some additional clarifications:

  1. Treatments: You correctly identified the treatments as the type of growing medium. Specifically, the treatments are:

    • Soil
    • Sand

  2. Response Variable: You identified the response variable accurately. It can be specified as:

    • The height of the sunflowers after one month (which reflects the amount of plant growth).

  3. Random Selection: Random selection would occur if you were to randomly choose which seeds from a larger population of sunflower seeds you would use for your experiment. Since you have a specific packet, random selection doesn’t apply unless you had multiple packets or types of seeds to choose from.

  4. Random Assignment: You explained random assignment correctly. It refers to the process of assigning which seeds will be planted in soil versus sand. Ideally, this should be done in a way that each seed has an equal chance of being assigned to either treatment group.

Summary:

To enhance your experiment, ensure that:

  • If you have multiple seeds, randomly select them if possible.
  • Randomly assign seeds to different treatments to eliminate bias.

Overall, your understanding of the experiment structure is solid! If you have any specific questions about the methodology or analysis, feel free to ask.