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
madam [21]
2 years ago
9

Marcus wants to know if students at his school like to sing in the shower. He polled 40 students who were not part of the school

choir. He found that 11 of the surveyed students enjoy singing in the shower. Is there a sampling bias in the situation above? A. No. Marcus selected a random, unbiased sample for his study. B. Yes. Marcus created bias by only polling 40 students. C. Yes. Marcus created bias by excluding students who are in the choir. D. There is not enough information to determine if Marcus selected a biased sample.
Mathematics
1 answer:
telo118 [61]2 years ago
5 0

Answer:

C

Step-by-step explanation:

You might be interested in
Suppose you have a right triangle area marked in the ground with a base (8-h) meters long and a height h meters long. the hypote
Aleks [24]

Answer:

5.415m and 2.585m long

Step-by-step explanation:

For a right triangle

hyp^2 = opp^2 + adj^2 (Pythagoras theorem)

Given

hypotenuse = 6m

height(opposite) = h meters

Adjacent = (8-h)m

Substitute into the expression above;

6² = h²+(8-h)²

36 = h²+64-16h+h²

36 = 2h²-16h+64

2h²-16h+64-36 = 0

2h²-16h+28= 0

Divide through by 2

h²-8h+14 = 0

Using the general formula

h = 8±√8²-4(14)/2

h = 8±√64-56/2

h = 8±√8/2

h = 8±2.83/2

h = 8+2.83/2 and 8-2.83/2

h = 10.83/2 and 5.17/2

h = 5.415 and 2.585

hence the length of the height of the right triangle are 5.415m and 2.585m long

7 0
2 years ago
What is the sum of the first 12 terms in the fibonacci sequence?
Neporo4naja [7]
Hello,

u_{1} =a\\
 u_{2} =b\\
 u_{3} =a+b\\
 u_{4} =a+2b\\
 u_{5} =2a+3b\\
 u_{6} =3a+5b\\
 u_{7} =5a+8b\\
 u_{8} =8a+13b\\
 u_{9} =13a+21b\\
 u_{10} =21a+34b\\
 u_{11} =34a+55b\\
 u_{12} =55a+89b\\

\boxed{\sum_{i=1}^{12}(u_i)=144a+232b\\}





8 0
2 years ago
A cylindrical rain barrel has a radius of 2 feet and holds a total of 30 cubic feet of water. How tall is the rain barrel? Use 3
Taya2010 [7]
I believe the answer is 12.56 due to the fact that you would use the formula v=3.14 x 2^2
7 0
3 years ago
Read 2 more answers
2+2 djfjkfkdkfjfjfjcjcncncj
Slav-nsk [51]

Answer:4

Step-by-step explanation:

4 0
3 years ago
Tan(-x)csc(-x)/sec(-x)cot(-x) simplify the expression
svlad2 [7]

\bf \cfrac{tan(-x)csc(-x)}{sec(-x)cot(-x)}\implies \cfrac{\quad \frac{sin(-x)}{cos(-x)}\cdot \frac{1}{sin(-x)}\quad }{\frac{1}{cos(-x)}\cdot \frac{cos(-x)}{sin(-x)}}\implies \cfrac{\quad \frac{1}{cos(-x)}\quad }{\frac{1}{sin(-x)}} \\\\\\ \cfrac{1}{cos(-x)}\cdot \cfrac{sin(-x)}{1}\implies \cfrac{sin(-x)}{cos(-x)}\implies \cfrac{\stackrel{\stackrel{symmetry}{identities}}{-sin(x)}}{cos(x)}\implies -tan(x)

8 0
3 years ago
Other questions:
  • CAN SOMEONE PLEASE ANSWER THIS ASAP!
    9·1 answer
  • A book sold 33,200 copies in its first month. Suppose this represents 7.4% of the number of copies sold to date. How many copies
    12·2 answers
  • I just need to find y explain please :p
    14·1 answer
  • Which of the following could be the measure of a pair of consecutive angles of a rhombus?
    15·1 answer
  • A box contains 1 plain pencil and 4 pens. A second box contains 6 color pencils and 2 crayons. One item from each box is chosen
    12·1 answer
  • Which of the following scenarios represents a causation between the two data sets?
    10·1 answer
  • Pls help meeeeeeee I do not understand
    6·1 answer
  • What is it congruent to and what is it’s postulate
    5·1 answer
  • It's always a good idea to check your solutions to any equation in the original equation. When solving an absolute value equatio
    6·1 answer
  • There were three parts to Rita's race. She ran the first part, which was 4/9
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!