Question

1. mark notices he has dropped calls on his cell phone when he walks into his bedroom. his friend told him to try and wrap aluminum foil around his phone to get better signal. mark talks on the phone 3 times while walking into his bedroom and drops 2 of the 3 calls. he wraps his phone in aluminum foil and talks on the phone 3 more times while walking into his bedroom. with the aluminum foil on his phone he only drops 1 phone call.

a) dependent variable =
b) constant =
c) what would be a testable hypothesis for marks experiment?

1. heidi is a chocolate lover and eats chocolate daily. she has a bad break - out and her friend told her eating chocolate causes pimples. heidi continues to eat chocolate every day for 2 weeks and counts the number of pimples she has on her face. the following 2 weeks she doesnt eat any chocolate and counts the number of pimples on her face.

a) independent variable =
b) dependent variable =
c) what is the purpose of heidis experiment?

1. ruthie has a pet goldfish. after several months the goldfish quits growing. ruthies mom told her the goldfish might have stopped growing because the tank is too small. ruthie measures the size of her goldfish in its current tank, and then puts the goldfish in a larger tank. after 2 months the goldfish is now 1cm longer.

a) independent variable =
b) dependent variable =
c) constant =
d) is the data that ruthie is gathering qualitative or quantitative? explain your reasoning.

1. nicholas has been biting his nails since he was a kid. he wants to break the habit so he puts bitter tasting nail polish on his left hand and leaves his right hand without polish. after 3 days he notices his nails on his left hand have grown but he continued to bite his right - hand nails.

a) independent variable =
b) dependent variable =
c) constant =

Explanation:

7.

• a) The number of dropped calls depends on other factors, so it's the dependent variable.
• b) The bedroom location and Mark's phone are unchanging aspects, so they can be considered constants.
• c) A testable hypothesis could be related to the impact of aluminum - foil on dropped calls.

• a) Whether Heidi eats chocolate or not is the factor she controls, so it's the independent variable.
• b) The number of pimples is what is affected by chocolate - eating, so it's the dependent variable.
• c) The purpose is to see if there is a relationship between chocolate consumption and pimple occurrence.

• a) The size of the tank is what Ruthie changes, so it's the independent variable.
• b) The growth of the goldfish is what is affected by the tank size, so it's the dependent variable.
• c) The goldfish itself is the same throughout, so it can be a constant.
• d) The data is quantitative as it involves a measurement (1 cm) of the goldfish's growth.

Answer:

a) Number of dropped calls
b) Bedroom location, Mark's phone
c) Wrapping a cell - phone in aluminum foil reduces the number of dropped calls when walking into a bedroom.

8.