1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
mel-nik [20]
3 years ago
8

Zach works at the Verizon store and wonders if iPhones last longer if the screen brightness is

Advanced Placement (AP)
1 answer:
algol [13]3 years ago
3 0

Explanation:(a) Was this an observational study or an experiment? Explain your reasoning. Experiment, because certain variables were controlled (he sets the screen brightness to low and then starts a movie) to determine if iPhones last longer if the screen brightness is set to low, and it proves the cause and effect relationship.

(b) What is the explanatory variable and the response variable? Response Variable- To determine if iPhones last longer if the screen brightness is set to low   Explanatory variable- he sets the screen brightness of 10 of the iPhones to high and starts a movie, then the other 10 to low and starts a movie.

(c) Was a random sample used to collect the data? Yes- “he selects a random sample of 20 brand new iPhones”

You might be interested in
You are given a box of 100 silver dollars, all facing "heads" up. You are instructed to shake the box 3 times; after each shake,
NemiM [27]

Answer:

Explanation:

Assume that after each shaking, a silver dollar has an equal chance of "head" or "tail" up.

There will be likely 100/2 = 50 dollar coins with "heads" up. Removing them leaves 50 coins.

Again after the second shakes, 50/2 = 25 coins will likely be "heads" up. Removing them leaves 25 coins.

After the third shakes, approximately 25/2 = 12.5 coins will be "heads" up. Of course there is no 0.5 coin. Rounding up you likely get to keep 13 dollar coins.

3 0
2 years ago
A hog farmer and a pork packing plant working together is known as horizontal coordination.
shutvik [7]

Answer:

true

Explanation:

操你bit子.  操你bit子

3 0
3 years ago
Read 2 more answers
Ang japanese garden ang bahagi ng caliraya na tatamnan
GenaCL600 [577]

Answer:

A aming

Explanation:

have a great day ahead

6 0
2 years ago
What are arguments used in defending against a criminal indictment ?
iVinArrow [24]
Arguments used in defending against a criminal would be 1) Infancy 2) Duress 3) XYY chromosome (makes men men aggressive), 4) Necessity, and 5) Entrapment (forced to commit a crime). 
4 0
3 years ago
Read 2 more answers
Your index fingers should be placed on which keys on the home row?
Mariulka [41]

Answer:

F J

Explanation: it dependes if your new to typing but if typing for a long time monitor

7 0
3 years ago
Read 2 more answers
Other questions:
  • The area of a triangle is 200 feet what is x if the height is 12 feet and width 5x
    11·1 answer
  • Health concerns are a key role in recruitment selection and retention of staff members because caregivers must be able to
    10·2 answers
  • Which temperature most likely corresponds to the asthenosphere?
    6·1 answer
  • Carefully read the following paragraph: "Learning takes place during all the child's activities and interactions. The classroom
    7·1 answer
  • If your job involves creating a positive image for a company in the media, what would your job description be?
    6·1 answer
  • I know the answer but I'm giving free points out :)
    7·2 answers
  • TIMED HURRY PLEASE( 40 points and a brainlist) Read the excerpt from William Seward’s The Building of the Erie Canal.
    8·2 answers
  • Lily created this flow chart to explain how the nervous system works<br> plz help
    9·2 answers
  • Ang vegetation coner ay
    12·2 answers
  • Write a method called roadTrip that (1) accepts as a parameter the diameter of the circular path, and (2) returns the length of
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!