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vfiekz [6]
2 years ago
11

What is the confidence interval estimate of the population mean percentage change in the price per share of stock during the fir

st quarter? Do not round intermediate calculations. Enter negative values as negative numbers, if any.
Mathematics
1 answer:
I am Lyosha [343]2 years ago
5 0

Answer:

(-0.1059 ; - 0.0337)

Step-by-step explanation:

The data table is attached in the picture below:

These is a matched pair design ; which requires taking the difference of the two values for each sample :

The mean and standard deviation of the difference will be used to construct the confidence interval :

The mean of difference, dbar = Σx/n = - 0.0698

The standard deviation of difference, Sd ;

Sd = [√Σ(d - dbar)²/(n-1)] = 0.1054

n = sample size = 25

The confidence interval :

dbar ± [TCritical * Sd/√n]

Tcritical at 90% ; df = n -1 = 25 -1

Tcritical(90% , 24) = 1.1711

C.I = - 0.0698 ± (1.711 * 0.1054/√25)

C.I = - 0.0698 ± 0.0361

C.I = (-0.1059 ; - 0.0337)

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Estimate the correlation coefficient for each of the above scatter plots?
nasty-shy [4]

Answer:

Negative Correlation

Step-by-step explanation:

We see that the overall trend is going from up to down. If you were to draw a best line of fit, it would have a negative slope. Therefore, our correlation is negative.

4 0
3 years ago
The Jackson family is driving from Boston to New York for a summer vacation trip. So far, they have driven 84 miles which is 40%
lesantik [10]

Answer:

210

Step-by-step explanation:

just use a percentage calculator

8 0
2 years ago
Read 2 more answers
HELP ME!! im so stumped. will give brainliest!
Olegator [25]

Answer:

x=1+\sqrt{3} and x=1-\sqrt{3}

Step-by-step explanation:

We have been given the parabola with vertex (1, -9) and y intercept at (0, -6).

Now we need to find the x-intercepts of that parabola. So first we begin by finding the equation of parabola using vertex formula:

y=a\left(x-h\right)^2+k

Vertex for this formula is given by (h,k)

Compare that with given vertex (1,-9), we get: h=1, k=-9

So plug these into vertex formula:

y=a\left(x-1\right)^2-9...(i)

Plug given point (0, -6). into (i)

-6=a\left(0-1\right)^2-9

-6=a\left(-1\right)^2-9

-6=a\left(1\right)-9

-6+9=a

3=a

Plug a=3 into (i)

y=3\left(x-1\right)^2-9

Now to find x-intercept, we just plug y=0 and solve for x

y=3\left(x-1\right)^2-9

0=3\left(x-1\right)^2-9

9=3\left(x-1\right)^2

3=\left(x-1\right)^2

\pm \sqrt{3}=x-1

1+\pm \sqrt{3}=x

Hence final answer are

x=1+\sqrt{3} and x=1-\sqrt{3}

4 0
3 years ago
The Recreation Center has an L-shaped pool. One pool is 8 meters by 6 meters. The other part is 12 meters by 6 meters. The whole
defon

Answer:

480m³

Step-by-step explanation:

The entire pool have the same depth which is 4metres

Since the pool is L shaped, we will find the volume of each part and add them together to get the volume of the entire pool.

Using the formula for calculating volume of a rectangular box

V = lwh

L is the length

w is the width

h is he height

For the first pool.

Length = 8m

Width = 6m

Height = 4m (depth)

Volume = 8×6×4

Volume = 192m³

For the other pool.

Length = 12m

Width = 6m

Height = 4m (depth)

Volume = 12×6×4

Volume = 288m³

Volume of the entire pool = 192+288 = 480m³

6 0
3 years ago
Please help me with this one??
Leviafan [203]

Answer:

Y =-25x +225

Step-by-step explanation:

First you can count the gradient first. Use then you can count y intercept

6 0
2 years ago
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