QQ1 Practice

What is a hypothesis?

• something that changes in an experiment

• something that stays the same in an experiment

• a prediction about what will happen in an experiment

• test for what it SAYS it tests for

What is a VALID experiment?

• something that changes in an experiment

• something that stays the same in an experiment

• a prediction about what will happen in an experiment

• test for what it SAYS it tests for

Choose a hypothesis for the given observation:

The pitcher notices if he ices his shoulder between innings, he pitches an average of 8 m.p.h. faster on each pitch.

• If the pitcher throws the ball harder, his pitches are faster

• If the pitcher doesn't ice his shoulder between innings, his pitches are slower.

• If the catcher stands further back, the pitcher throws faster.

• If the pitcher ices his shoulder between innings, his pitches are faster.

Janel tests to see which cat food her cat liked best by putting out all of the types of food one night and looking at it a few hours later. The dog was in the house as well as the cat, and she didn't watch the food the entire time. She didn't measure it, and she hadn't fed the cat for a few days before the experiment. Is this a valid experiment, even by 'backyard science' standards?

• Yes

• No

Terrance wanted to test how well he can hide vegetables in food because his little sister was a picky eater. He decided to hide carrots in cookies as his first test. He made sugar cookies, half with pureed carrots added and half with orange food coloring, and otherwise they were the same. he served them at a family party (25 people, everyone ate one of each) without people knowing there was a difference and asked questions after. Is this a valid experiment, even by 'backyard science' standards?

• Yes

• No

What makes an experiment RELIABLE?

• it comes to work on time

• it test for what it SAYS it tests for

• you can run the test over and over and get the same or similar results

• chemical reactions

Which part(s) of your experimental design do you need to think carefully about to keep your experiment VALID? (2 correct answers)

• constants

• large sample size (large group tested)

• observations

• repeated trials

• control group

Which part(s) of your experimental design do you need to think carefully about to keep your experiment RELIABLE? (2 correct answers)

• constants

• large sample size (large group tested)

• observations

• repeated trials

• control group

What are variables in an experiment?

• the things that stay the same in an experiment

• a prediction about what will happen in an experiment

• the things that change in an experiment

• the things that you gather using your senses

What are constants in an experiment?

• the things that stay the same in an experiment

• a prediction about what will happen in an experiment

• the things that change in an experiment

• the things that you gather using your senses