Hypothesis
Observation vs Inference
Vocabulary
Identifying Variables
What is the conclusion?
100
Brushing your teeth everyday will make your teeth stronger
If you brush your teeth everyday Then your teeth will be stronger.
100
The book is 10 inches long
Observation
100
What is the difference between observation and inference?
Observation is what you see and inference is the conclusion you make based on observations
100
Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each 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, Smithers counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
Control Group -- Group B Independent Variable -- Special Juice Dependent Variable -- Number of stacks
100
Jordan is doing a science fair project on the effects of music on the growth of tomatoes. He has two tomato plants, Plant A and Plant B, that he grows in a window and gives the same amount of water. Plant A is exposed to classical music using headphones attached to the soil. Throughout the growth period, Jordan counts the number of tomatoes produced by each plant. Plant A = 35 Tomatoes | Plant B = 55 Tomatoes What should be the conclusion?
Jordans conclusion should be that the music has a negative affect on the plant
200
Nike sneakers will allow you to jump the highest.
If I use Nike sneakers to jump then I will jump higher.
200
The pool has 500 gallons of water
observation
200
What is the difference between Hypothesis and prediction?
Prediction is a guess and hypothesis is a guess based on background information.
200
Homer 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. Homer 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 "treatment" there is no change in the appearance of the green slime on either side of the shower.
Control Group - Side sprayed with water Independent Variable - Coco Juice Dependent Variable - Appearance of Slime
200
Tina asks the question “Does caffeine increase the heart rate of an earthworm?” In Test 1, she measures the heart rate by looking at the earthworm under a microscopes, the earthworm has a heart rate of 50 bpm (beats per minute). In Test 2, she places a few drops of caffeine on the earthworm’s skin and measures the rate again. In this test, the heart rate is 68 bpm.
Caffeine affects the worms heart rate.
300
The amount of time watching TV will affect a students grades
If a student watches TV more than 6 hours a day then a students grades will be affected.
300
All of the students in the room like pizza
Inference
300
What is the difference between independent and dependent variable?
Independent variable is what you test or change and dependent variable is what you measure or observe
300
Leo placed two circles of paper in a Petri dish (something used for growing bacteria). One circle of paper was soaked in penicillin. The other had nothing on it. He poured a liquid filled with bacteria into the Petri dish. Both circles of paper were placed in the Petri dish about 3cm apart. At the end of the experiment, a circle with a radius of 2cm formed around the circle of paper soaked in penicillin. There were no bacteria growing in the 2cm circle. No change had occurred around the other circle of paper. The bacteria were growing well.
Independent: penicillin dependent: amount of bacteria Control: The paper without the penicillin
300
Bart believes that mice exposed to radiowaves will become extra strong (maybe he's been reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice near a radio for 5 hours. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. he found that 8 out of 10 of the radiowaved mice were able to push the block away. 7 out of 10 of the other mice were able to do the same.
Improves strength, maybe inconclusive not 100 percent
400
Melissa raises crickets at her pet store that she sells for reptile food. She thinks that crickets chirp more often when the temperature gets warmer. She decides to conduct an experiment to prove her theory.
If the temperature is warm then the amount of cricket chirps will increase
400
All of the girls in the room have dyed their hair
Inference
400
Alex was asked to complete three trials during his experiment. What are trials?
Conducting the same experiment more than once is a trial.
400
The number of flowers on different breeds of bushes in a greenhouse is recorded every week for two months. The first group is given 20ml of water each day (which is normal). The second group is given 20ml of water and 1 gram of miracle grow each day. And the third group is given 40 ml of water and 2 grams of miracle grow each day.
Independent: Miracle grow Dependent: amount of flowers Control group: The first group
400
Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each 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, Smithers counts how many stacks of papers each group has made. Group A made 1,587 stacks, Group B made 2,113 stacks.
It does not work
500
The cooler the temperature in a lake, the more oxygen the water holds. Daniel notices that he catches more fish in a lake that is cooler than 55 degrees. He wants to conduct a study so he can catch the most fish possible this year. He’s having trouble writing a hypothesis. Please help him.
If the lake is cooler than 55 degrees then Daniel will catch more fish because there is more oxygen in the lake.
500
Children are happy because of the clown at the party
Inference
500
What are constant variables?
The variables that are kept the same through out the experiment
500
You give four sunflowers different watering with either pure water or different concentrations of salt solutions. After a two-week period, the height is measured.
independent: salt dependent : growth of plant Control group: sunflower with pure water
500
Homer 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. Homer 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 "treatment" there is no change in the appearance of the green slime on either side of the shower.
It does not work
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