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
SVEN [57.7K]
2 years ago
6

Suppose the students construct a 95% confidence interval for the true weight of their rocks. Whose interval do you expect to be

more precise (narrower)? (i) The student who weighed the rock 20 times. (ii) The student who weighed the rock 5 times. (iii) Both intervals would be equally precise.
Mathematics
1 answer:
MakcuM [25]2 years ago
7 0

Answer:

(i) The student who weighed the rock 20 times.

Step-by-step explanation:

The margin of error of a confidence interval is:

M = z*\frac{\sigma}{\sqrt{n}}

In which z is related to the confidence level, \sigma is the standard deviation of the population and n is the size of the sample.

From the equation above, the larger the size of the sample, the lower the margin is, that is, the narrower the interval is.

In this question:

A student weighed the rock 20 times and other the 5. From above, the one who weighed the rock 20 times will have the more precise interval.

So the correct answer is:

(i) The student who weighed the rock 20 times.

You might be interested in
Free Póints for all ​
lyudmila [28]

thanks for free pints.........

7 0
2 years ago
Read 2 more answers
Freeeeeee Points whats 2 plus 100009​
yKpoI14uk [10]

Answer:

free points??????????? thank h so much

7 0
2 years ago
If f(x) = x3 – x2 – 3, which of the following is equal to g(x) = f(2 – x)?
Andru [333]

Answer:

-x^3+5x^2-8x+1, which is choice A

======================================

Work Shown:

f(x) = x^3 - x^2 - 3

f(x) = (x)^3 - (x)^2 - 3

f(2-x) = (2-x)^3 - (2-x)^2 - 3 ................ see note 1 (below)

f(2-x) = (2-x)(2-x)^2 - (2-x)^2 - 3 ........... see note 2

f(2-x) = (2-x)(4-4x+x^2) - (4-4x+x^2) - 3 ..... see note 3

f(2-x) = -x^3+6x^2-12x+8 - (4-4x+x^2) - 3 ..... see note 4

f(2-x) = -x^3+6x^2-12x+8 - 4+4x-x^2 - 3 ....... see note 5

f(2-x) = -x^3+5x^2-8x+1

----------

note1: I replaced every copy of x with 2-x. Be careful to use parenthesis so that you go from x^3 to (2-x)^3, same for the x^2 term as well.

note2: The (2-x)^3 is like y^3 with y = 2-x. We can break up y^3 into y*y^2, so that means (2-x)^3 = (2-x)(2-x)^2

note3: (2-x)^2 expands out into 4-4x+x^2 as shown in figure 1 (attached image below). I used the box method for this and for note 4 as well. Each inner box or cell is the result of multiplying the outside terms. Example: in row1, column1 we have 2 times 2 = 4. You could use the FOIL rule or distribution property, but the box method is ideal so you don't lose track of terms.

note4: (2-x)(4-4x+x^2) turns into -x^3+6x^2-12x+8 when expanding everything out. See figure 2 (attached image below). Same story as note 3, but it's a bit more complicated.

note5: distribute the negative through to ALL the terms inside the parenthesis of (4-4x+x^2) to end up with -4+4x-x^2


4 0
3 years ago
A B means:
SVETLANKA909090 [29]

Answer:

A is a subset of B i believe that's the answer

8 0
2 years ago
Twelve dogs and cats receive 77 biscuits.
Andrews [41]

Answer:

6 dogs are there who ate the biscuits

8 0
2 years ago
Read 2 more answers
Other questions:
  • PLEASE HELP !!!!! which graph represents this system of inequalities?
    9·1 answer
  • Angle 1 and angle 2 are vertical angles.
    14·1 answer
  • this hanger is in balance. there are 2 labeled weights of 4 grams and 12 grams the 3 circles have the same weight. what is the w
    12·1 answer
  • Which of the following is a zero of the equation ?
    11·1 answer
  • My tens digit is less than 7. I am one away from being a multiple of 5. If you half me you will not get a whole number. Who am I
    13·2 answers
  • [Help Fast, Will Mark Brainliest] Question is in the image.
    13·1 answer
  • What is a falafel ?????
    11·1 answer
  • Rewrite in simplest terms (-9x-2y)+(4x-5y)
    6·2 answers
  • Simplify Using Laws of Exponent (4x^-2)^3
    12·1 answer
  • Sophie deposited money into an account in which interest is compoundedsemiannually at a rate of 2.4%. She made no other deposits
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!