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
sweet [91]
3 years ago
8

A manufacturer claims that its new hand sanitizer reduces the number of days an average person is sick in a year. To test this c

laim, a researcher decided to conduct an experiment. The researcher randomly selected 300 people, divided into subject groups by age. Over the course of a year, all the subjects regularly used the hand sanitizer. At the end of the year, the researcher compared the number of days that the subjects in each group were sick.
Which statements about this experiment are true?

Mathematics
2 answers:
Andrew [12]3 years ago
5 0

Answer:

The study uses blocking and random sampling.

Step-by-step explanation:

marysya [2.9K]3 years ago
3 0

Answer:

in my opinion is the last:

this studies uses a control group

Step-by-step explanation:

You might be interested in
A triangle with an area of 2/3 cm² is dilated by a factor of 6.
vazorg [7]
By the word "dilation" we mean to say that the dimension of the new triangle is 6 times longer than the dimensions of the former triangle. The ratio between the area of the new triangle and the old one is equal to the square of the ratio of their sides. If we let x be the area of the larger triangle then,
                    (x / 2/3 cm²) = (6/1)²
The value of x from the equation is 24. Thus, the area of the larger triangle is equal to 24 cm².
6 0
3 years ago
Read 2 more answers
Sophia has three stickers for every two stickers that Ethan has. If Sophia gives Ethan 16 of her stickers, then Ethan will have
olga_2 [115]

Answer:

  60

Step-by-step explanation:

Let s represent the number of stickers Sophia has. Then the number Ethan has is (2/3)s. The transfer of 16 stickers can be described by the equation ...

  (s -16)/(2/3s +16) = 1/2 . . . . . sophia/ethan = 1/2 after the transfer

  2s -32 = 2/3s +16 . . . . . . . . .cross multiply

  4/3s = 48 . . . . . . . . . . . . . . . add 32-2/3s

  s = (48)(3/4) = 36 . . . . . . . . .multiply by 3/4

Together, the total number of stickers held is s +(2/3)s = (5/3)s.

  5/3s = (5/3)(36) = 60 . . . . . total of Sophia's and Ethan's stickers

Together, Sophia and Ethan have 60 stickers.

7 0
3 years ago
(c^3b^1a^4)^4 + 3a^16b^4c^12
azamat

Answer: 4a16b4c12

Step-by-step explanation:

5 0
3 years ago
Math problem+Zoey, a Gelada Baboon, is tied to one of the outside corners of a regular hexagon-shaped research facility, where h
dexar [7]

Answer

The monkey will be able to cover an area of 22.86 meters which is equivalent to two sides and half of the building.

Step-by-step explanation:

The length of the monkeys rope = 75 feet long

Each side of the hexagon shaped facility = 30 feet

Note that, 1 feet = 0.3048 m

if we convert 30 feet to Meter, we have,

30 × 0.3048 = 9.144

Therefore, 30 + 30 +15 = 75 which is equivalent to the two side and half side of the hexagon shaped building

75 feet × 0.304 meter = 22.86 meters.

So the total area the monkey will be able to cover will be

= 22.86 Meters which is equivalent to two sides and half of the hexagon shape building.

8 0
3 years ago
21²/0.219 to 2 significant figures​
Oksanka [162]
21^2/0.219 = 2013.69863
2 significant figures are the 20, so the answer is 2000
3 0
2 years ago
Read 2 more answers
Other questions:
  • I NEED HELP PLEASE HELP IF YOU CAN ASAP
    10·1 answer
  • A 180 ft long board is cut into 3 pieces. The second piece of board is twice as long as the first. The third piece of board is s
    7·1 answer
  • Which of the following has the lowest unit price?
    11·1 answer
  • HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP
    12·1 answer
  • Please help it would be appreciated!
    5·1 answer
  • Use the distributive property to write<br> 13y - (5x - 3y) + x without parentheses.
    6·1 answer
  • Tameka ran one lap around a circular track that had a diameter of 20.5 feet. How far did she run? Round your answer to the neare
    8·1 answer
  • Andrea brought $54.00 to the art supply store. She bought a brush, a sketchbook, and a paint set. The brush was one-sixths as mu
    6·1 answer
  • PLEASE HELP AND GET 25 POINTS! ❄️<br><br> Please see the image
    12·1 answer
  • (marking brainliest or however you spell it)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!