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
MAXImum [283]
4 years ago
10

Identify the sample as biased or unbiased and describe its type. John wanted to know about the popularity of a particular movie.

He surveyed 20% of the people in 5 different theaters.
Mathematics
1 answer:
I am Lyosha [343]4 years ago
5 0

Answer: unbiased; simple random sampling

Step-by-step explanation:

From the question, we are informed that John wanted to know about the popularity of a particular movie and that he surveyed 20% of the people in 5 different theaters.

This is an unbiased sample. This is because everybody at the theaters have an equal chance of being chosen by John.

Also, it's a simple random sampling. This is because a subset of the entire population is randomly selected.

You might be interested in
(1 point) Carbon dating is often used to determine the age of a fossil. For example, a humanoid skull was found in a cave in Sou
Aleksandr [31]

Answer:

The estimated age of the skull is 39118 years.

Step-by-step explanation:

The amount of the substance after t years is given by:

A(t) = A(0)(1-r)^t

In which A(0) is the initial amount, and r is the decay rate.

The half-life of carbon-14 is about 5600 years.

This means that A(5600) = 0.5A(0). We use this to find r, or 1 - r, to replace in the equation. So

A(t) = A(0)(1-r)^t

0.5A(0) = A(0)(1-r)^{5600}

(1-r)^{5600} = 0.5

\sqrt[5600]{(1-r)^{5600}} = \sqrt[5600]{0.5}

1 - r = (0.5)^{\frac{1}{5600}}

1 - r = 0.9999

So

A(t) = A(0)(0.9999)^t

Only 2% of the original amount of carbon-14 remains in the burnt wood of the campfire.

This is t for which A(t) = 0.02A(0). So

A(t) = A(0)(0.9999)^t

0.02A(0) = A(0)(0.9999)^t

(0.9999)^t = 0.02

\log{(0.9999)^t} = \log{0.02}

t\log{0.9999} = \log{0.02}

t = \frac{\log{0.02}}{\log{0.9999}}

t = 39118

The estimated age of the skull is 39118 years.

6 0
3 years ago
Ms. Flair teaches art. She keeps her paintbrushes in a crate that is shaped like a cube. The crate measures 10 inches on each si
Zielflug [23.3K]

Answer:

100 cubic inches

Step-by-step explanation:

length times width equals volume

10 times 10 equals 100

4 0
4 years ago
Read 2 more answers
PLEASE HELP I NEED HELP
Kisachek [45]

Answer:

5

Step-by-step explanation:

SQ= 10

SO is half way so divide by 2

8 0
4 years ago
49% of the animals at an animal shelter are dogs. About what fraction of the animals at the shelter are dogs?
vivado [14]

Answer:

49÷100

Step-by-step explanation:

49% simply means 49 divided by 100

7 0
3 years ago
write the equation of the line that passes through the point (2,-3) and is perpendicular to the line y=-2x+3. And how do you fin
pogonyaev

Answer:

y=2x-7

Step-by-step explanation:

The easiest way to answer this would be by using the slope-intercept form equation, y=mx+b. In this case, we can use our given in information to plug in values and find the equation.

Firstly, let's assess what know and what we don't:

Given the point (2,-3), we know that x=2 and y=-3. Now the slope for a perpendicular line can be found using a negative reciprocal, since the product of the slopes of both lines should equal -1. Therefore the slope must be 2.

All that's left is b, the y-intercept. To solve for this, we simply plug in what we have.

y=mx+b

-3=2(2)+b

-3=4+b

-3-4=b

-7=b

Now that we have b, we can write the equation:

y=2x-7

3 0
3 years ago
Other questions:
  • What is 125 x 12? pls help!!!
    11·1 answer
  • If susie paid $579 in taxes on gross income of $2953, what percent of her gross pay is being taken out in taxes?
    9·1 answer
  • Solve the equation using the quadratic formula x^2+10x-25=0
    7·2 answers
  • What is the distance covered by a train while slowing down from
    10·1 answer
  • Hello please help i’ll give brainliest
    10·2 answers
  • Can someone help fast​
    8·2 answers
  • Determine the area of the rectangle below
    14·2 answers
  • 40 of the cats at the pet store are black which is 25%of all of the cats how many cats are there at the pet store
    13·2 answers
  • The bill for the dinner comes to $39.50.<br> How much is a 15% tip to the nearest cent?
    8·1 answer
  • What is the product?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!