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Temka [501]
3 years ago
13

Say youre going to conduct a t procedure for the difference between the means of two populations. You decide the samples of size

s 12 and 15 are independent. Which of the following statements are true?
1. If we pool variances the number of degrees of freedom is 25.
2. If we don't pool and we don't have access to software to compute the degrees of freedom the number of degrees of freedom is 11.
3. For a given level of confidence c a confidence interval based on 11 degrees of freedom will be wider than one based on 25 degrees of freedom.
Mathematics
1 answer:
stiv31 [10]3 years ago
6 0

Answer:

all 3 are correct.

I

II

III

you're welcome

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What is the ratio of melvins weight to the total weight of the two boys
Flauer [41]
Ratio of volume is a cubed: b cubed
8 0
3 years ago
Mia is tracking her savings account balance . She knows the equation to find her balance y in any year t, but she can't remember
motikmotik

Complete question is;

Mia is tracking her savings account balance. She knows the equation y = 8000p^(t) can be used to find her balance y in any year t, but she can't remember what p represents. Her balance 3⅔ years after opening her account, is $9,905.54. What is the value of p?

Answer:

p = 1.06

Step-by-step explanation:

We are told that the equation y = 8000p^(t) can be used to find her balance y in any year t.

Now, we are given t = 3⅔ = 11/3 years

Also, we are given balance after 11/3 years as;

y = $9,905.54

Thus;

Plugging the relevant values into y = 8000p^(t), we have;

9,905.54 = 8000p^(11/3)

p^(11/3) = 9905.54/8000

p = (9905.54/8000)^(3/11)

p = 1.06

4 0
4 years ago
PLEASE HELP 30 PTS!!! Select ALL the correct answers. Which expressions are equivalent to the following?
Oksanka [162]

Answer:

  D:  -5(-6x^2 + x + 2)

  E:  5(2x + 1)(3x − 2)

Step-by-step explanation:

The <em>first two answer choices have incorrect constants</em> (25 and 3 vs -10). A factor of 5 is removed from the remaining answer choices, so let's remove a factor of 5 and see what we get:

  30x^2 -5x -10 = 5(6x^2 -x -2)

An additional x cannot be factored from the expression, so <em>choice C can be eliminated</em>.

Multiplying each of these factors by -1 will make the product correspond to answer choice D.

Factoring will make it correspond to answer choice E, best verified by finding the x-term of the product of the binomial factors:

  E:  2x(-2) +1(3x) = -x, as required

  F:  2x(2) -1(3x) = x, wrong sign

The equivalent expressions are those of choices D and E.

7 0
3 years ago
Slove: 3x + 4 - 2x - x = 4x - 5​
MAXImum [283]

Answer:

×=3

Step-by-step explanation:

you have to do 3×-2×=1x

and than the formal look like ×+4=4×-5

and move × to other side so that become 3x

and move 5 to +5 so that become 9

the formal look like 9=3×

and divide 3/9 is your answer

×=3

8 0
3 years ago
Read 2 more answers
A line passes through the point (4,-6) and he a slope -3/4. Which is the equation of the line?
ANEK [815]

Answer:

The equation of the line is 3x + 4y + 12 = 0

Step-by-step explanation:

given \: that \: the \: line \: passes \: through \: (4 , - 6) \\ and \: has \: the \: slope \: of \:  \frac{ - 3}{4}  \\ the \: equation \: of \: the \: line \: is \\ y - y1 = m(x - x1) \\ here \: x1 = 4 \:  \:  \: y1 =  - 6 \:  \: and \: m =  \frac{ - 3}{4}  \\ on \: substituting \: the \: values \: in \: formula \\ y - ( - 6) =  \frac{ - 3}{4} (x - 4) \\ y + 6 = \frac{ - 3}{4} (x - 4)  \\ 4(y + 6) =  - 3(x - 4) \\ 4y + 24 =  - 3x + 12 \\ 3x + 4y + 24 - 12 = 0 \\ 3x + 4y + 12 = 0

<em>HAVE A NICE DAY</em><em>!</em>

<em>THANKS</em><em> </em><em>FOR GIVING ME THE OPPORTUNITY TO</em><em> </em><em>ANSWER YOUR QUESTION</em><em>. </em>

8 0
3 years ago
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