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28 Nov 2019

When scientists test one variable at a time and hold all other variables the same, this is called a(n) __________.

A) dependent variable

B) controlled experiment

C) independent variable

D) control group

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Patrina Schowalter
Patrina SchowalterLv2
14 Feb 2019
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A. Independent Variable:

B. Dependent Variable:

C. Controlled Variables/Constants:

D. Experimental Controls/ Control Groups:

2. To determine if the type of agar affects bacterial growth, ascientist cultures E. coli on four different types of agar. Fivepetri dishes are set up to collect results:

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  • One with MacConkey agar and E. coli
  • One with LB agar and E. coli
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All petri dishes received the same volume of agar, and were thesame shape and size. During the experiment, the temperature atwhich the petri dishes were stored, and at the air quality remainedthe same. After one week the amount of bacterial growth wasmeasured.

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Need help developing a hypothesis and experiment based on a relationship to oxygen to growth lab (basic micro lab using thioglycollate, tsa agar plate and anaerobe boxes/gas packs as media and four cultures including Pseudomonas fluorescens, clostridium butyricum, Staphylococcus aureus, and enterococcus faecalis) determining which are obligate aerobs, obligate anerobes, facultative anaerobes, and aerotolerant. I need to design an experiment with hypothesis, controlled variable, independent variable, and dependent variable. Please help--thank you!Need help developing a hypothesis and experiment based on a relationship to oxygen to growth lab (basic micro lab using thioglycollate, tsa agar plate and anaerobe boxes/gas packs as media and four cultures including Pseudomonas fluorescens, clostridium butyricum, Staphylococcus aureus, and enterococcus faecalis) determining which are obligate aerobs, obligate anerobes, facultative anaerobes, and aerotolerant. I need to design an experiment with hypothesis, controlled variable, independent variable, and dependent variable. Please help--thank you!

Oxygen Lab worksheet

What is a hypothesis that can be developed using data collected from this experiment?

Provide a brief description of an experiment that can be performed to test that hypothesis.

In your proposed experiment, provide at least one example of each of the following variables:

Controlled variable

Independent variable

Dependent variable

What useful or applied information can be gathered from this type of experiment?

That is, what is a real-world application of this information?

I need help identifying/understandining control and experimental groups. This is the scenario.

On a recent drive during a hot (90+), humid but rainy day, I noticed/heard a high-pitched sound coming from the right side/dash area of my car. I was about 30miles from home and became very concerned there was something wrong with the car that would cause me to be stranded. No other diagnostic or 'indicator' in the car registered any issues. Therefore, I decided to isolate the sound by eliminating certain factors (i.e. turning off the car, leaving the car on but turning off the AC, radio and etc.) I felt if I was able to isolate and/or eliminate the sound I could determine if it was an actual alarm I needed to be concerned with.

What are the control and experimental treatments or groups in your example?

Control Group:

Experimental Group:

**Also, am I on track concerning these?**

What are the independent, dependent and controlled variables in your experiment?

Independent variable/s: The variable that is changed during the experiment.

The engine (on/off)

The Radio (on/off)

The AC (on/off)

Dependent variable: The outcome variable that is measured each time the independent variable is changed.)

The high-pitched noise.

Control variable: The variable that may affect the outcome. When possible, it should remain constant.

The car.

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