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Keith_Richards [23]
3 years ago
15

Use the formula to find the standard error of the distribution of differences in sample means, x¯1-x¯2 . Samples of size 110 fro

m Population 1 with mean 94 and standard deviation 14 and samples of size 85 from Population 2 with mean 72 and standard deviation 15 Round your answer for the standard error to
Mathematics
1 answer:
Volgvan3 years ago
7 0

Answer:

2.104

Step-by-step explanation:

Data provided in the question:

For sample 1,

n₁ = 110

μ₁ = 94

s₁ = 14

For sample 2,

n₂ = 85

μ₂ = 72

s₂ = 15

Now,

Standard error = \sqrt{\frac{s^2_1}{n_1}+\frac{s^2_2}{n_2}}

or

Standard error = \sqrt{\frac{14^2}{110}+\frac{15^2}{85}}

or

Standard error = √4.43

or

Standard error = 2.104

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Which of the following equations has one real solution?
erastovalidia [21]

Answer:

4x2−12x+9=0

Step-by-step explanation:

The equation, 2x2+x+3=0, does not have a solution

The equation, x2+5x−3=0, equals -5/2+1/2√37 and -5/2+-1/2√37

The equation, x2−5x+4=0, equal 1 and 4

The equation, 4x2−12x+9=0, equals only 3/2

Hope this Helps

4 0
2 years ago
Vivenne, John and nassim ran for 6th grade class president. Vivenne got four votes for every 3 votes that John got. Nassim got t
liq [111]

Answer:

John received 10% of the overall votes.

Step-by-step explanation:

Let us assume that the number of votes John got  = m

So, the number of votes Vivienne received =   3 times (John's share )

 = 3  times m   =  3 m

Also, The number of Votes Nassim received = 2 times ( Vivienne's share)

2 x (3 m)   = 6 m

Total Votes in the grade 6  

= Votes received by { John + Vivienne + Nassim}

= m + (3 m) + (6 m) = 10 m

Hence, the total number of students who voted in grade 6  = 10 m

\textrm{The percentage of John's Votes }  = \frac{\textrm{Number of votes John received}}{\textrm{Total number of votes }}  \times 100

= \frac{m}{10m}  \times 100 = 10

or, The percentage of John's Votes  = 10%

Hence, John received 10% of the overall votes.

3 0
3 years ago
A movie theater sends out a coupon for 75 percent off. Write an equation for the situation​
ZanzabumX [31]
75%. Move the decimal to spots to the left so .78 then divided it by the cost of the movie ticket and that will be the cost of the ticket with the Collin
6 0
3 years ago
Give an equation which describes the intersection of this sphere with the plane z=0z=0.
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<span><span>C=(<span>x0</span>,<span>y0</span>,<span>z0</span>)</span><span>C=(<span>x0</span>,<span>y0</span>,<span>z0</span>)</span></span><span> and radius </span><span>rr</span>.

<span><span>(x−<span>x0</span><span>)2</span>+(y−<span>y0</span><span>)2</span>+(z−<span>z0</span><span>)2</span>=<span>r2</span></span><span>(x−<span>x0</span><span>)2</span>+(y−<span>y0</span><span>)2</span>+(z−<span>z0</span><span>)2</span>=<span>r2</span></span></span><span> </span>
4 0
3 years ago
Is the answer B correct?
VashaNatasha [74]
If you do the elimination process, here it is.

- A : Too small

+ B : I think so

- C : I little too big

- D : Way too big
7 0
3 years ago
Read 2 more answers
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