Does salt dissolve faster when stirred fast or slow? What would be the variable in this experiment?

Mr. McNiece wanted to see how different types of music affected students' pulse rates. She played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. What constant (something that is kept the same) should be considered when doing this experiment?

Nick wanted to see how high an ice cube would float in different temperatures of water. Identify the variable.

Mr. McNiece wanted to see how different types of music affected students' pulse rates. She played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. Identify the variable.

Jessie is concerned about how tired his classmates seem. He created a drink that he thinks will boost their energy. He recruits 100 classmates with a history of tiredness. He has 50 of them drink his new special energy drink. The other 50 drink a beverage that looks like the special energy drink, but is just water and food coloring. Both groups were told that they were getting the special drink that would boost energy. After 2 hours, 30 classmates in the first group reported having more energy and 8 classmates in the second group reported having more energy.

What is the variable?

What would the variable be in an experiment testing which types of paper airplane goes furthest?

A custodian notices some dirty tables and wants to know what's the best cleaner. He uses a new spray cleaner to remove the green slime left by students on half of his tables and water on half of his tables. Identify the variable.

This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted.

What is the definition of variable, and how many should there be?

Controls don't

You are managing a large feed lot. A pharmaceutical company wants you to try a new antibiotic to treat shipping fever (a sickness) in newly arrived cattle. The company claims that it is more effective at a lower cost than your current antibiotic you are using. You will measure the temperature of the cattle to see whether or not it works. WHAT IS THE VARIABLE?

You are managing a large feed lot. A pharmaceutical company wants you to try a new antibiotic to treat shipping fever in newly arrived cattle. The company claims that it is more effective at a lower cost than your current antibiotic you are using. You will measure the temperature of the cattle to see whether or not it works. WHAT IS THE CONTROLGROUP?

Eiko is doing an experiment to determine the best fertilization plan for bean plants.

She will test four groups of four plants using this schedule.

Which group is the control group?

A drug company is testing a new medicine. They give one group of test subjects the new medicine in a tablet. They give the other group an identical tablet with no medicine.

What is the best reason that one group gets a matching tablet with no medicine?

Martin is doing an experiment to see the way plants grow without soil. He is growing the plants in different solutions of water and nutrients. In this experiment, what is a plant

that gets no nutrients called?

A gardener is doing an experiment. He is trying to find the solution of nutrients and water that is best for growing carrots.

He plants four groups of carrots. Which group shows that no nutrients were provided?

Asmee is doing an t investigation using four of her brother’s baby teeth that are about the same size. She put one tooth in a cup of cola, one in a cup of apple juice, one in a

cup of orange juice, and one in a cup of distilled water. In a month, she will see what has happened to each of the teeth.

What is the control in this experiment?

Sergio is testing to find out what prevents or stops yeast growth. He made a mixture of yeast and yeast food. He put some of it into each of four groups of four bottles. To

one group he added a tablespoon of vinegar. To another he added a tablespoon of ammonia. To another he added a tablespoon of bleach. He covered the mouths of all

four groups of bottles with balloons.

What is the control group in this experiment?

scientist is doing an experiment. She wants to find the best way to break down sewage waste. She will test a chemical, Bacteria X, and Bacteria Y.

What should she use as the control group for this experiment?

A custodian notices some dirty tables and wants to know what's the best cleaner. He uses a new spray cleaner to remove the green slime left by students on half of his tables and water on half of his tables. Identify the control gorup.

Eiko is doing an experiment to determine the best fertilization plan for bean plants.

She will test four groups of four plants using this schedule.

Which group is the variable?

Asmee is doing an t investigation using four of her brother’s baby teeth that are about the same size. She put one tooth in a cup of cola, one in a cup of apple juice, one in a

cup of orange juice, and one in a cup of distilled water. In a month, she will see what has happened to each of the teeth.

What is the variable in this experiment?