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3 years ago

4divided by 5419 show work plssssssssss

Mathematics

1 answer:

MAVERICK [17]3 years ago

3 0

Here is the answer to your question. I wasn’t sure what number to round to, so I had three places.

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Conservationists have despaired over destruction of tropical rain forest by logging, clearing, and burning." These words begin a

IgorLugansk [536]

Answer: -8.16 to 15.84

Step-by-step explanation: <u>Confidence</u> <u>Interval</u> is an interval in which we are a percentage sure the true mean is in the interval.

A confidence interval for a difference between two means and since sample 1 and sample 2 are under 30, will be

$x_{1}-x_{2}$ ± $t.S_{p}\sqrt{\frac{1}{n_{1}}+\frac{1}{n_{2}} }$

where

x₁ and x₂ are sample means

t is t-score

$S_{p}$ is estimate of standard deviation

n₁ and n₂ are the sample numbers

The estimate of standard deviation is calculated as

$S_{p}=\sqrt{\frac{(n_{1}-1)s_{1}^{2}+(n_{2}-1)s_{2}^{2}}{n_{1}+n_{2}-2} }$

where

s₁ and s₂ are sample standard deviation of each sample

Degrees of freedom is:

$df=n_{1}+n_{2}-2$

df = 12 + 9 - 2

df = 19

Checking t-table, with 90% Confidence Interval and df = 19, t = 1.729.

The mean and standard deviation for 12 unlogged forest plots are 17.5 and 3.53, respectively.

The mean and standard deviation for 9 logged plots are 13.66 and 4.5, respectively.

Calculating estimate of standard deviaton:

$S_{p}=\sqrt{\frac{(12-1)(3.53)^{2}+(9-1)(4.5)^{2}}{12+9-2} }$

$S_{p}=\sqrt{\frac{299.07}{19} }$

$S_{p}=$ 15.74

The difference between means is

$x_{1}-x_{2}$ = 17.5 - 13.66 = 3.84

Calculating the interval:

$t.S_{p}\sqrt{\frac{1}{n_{1}}+\frac{1}{n_{2}} }$ = $1.729.15.74.\sqrt{\frac{1}{12} +\frac{1}{9} }$

$t.S_{p}\sqrt{\frac{1}{n_{1}}+\frac{1}{n_{2}} }$ = $27.21\sqrt{\frac{21}{108} }$

$t.S_{p}\sqrt{\frac{1}{n_{1}}+\frac{1}{n_{2}} }$ = $27.21\sqrt{0.194}$

$t.S_{p}\sqrt{\frac{1}{n_{1}}+\frac{1}{n_{2}} }$ = 12

Then, interval for the difference in mean is 3.84 ± 12, which means the interval is between:

lower limit: 3.84 - 12 = -8.16

upper limit: 3.84 + 12 = 15.84

The interval is from -8.16 to 15.84.

5 0

3 years ago

On a scale drawing, the scale factor is 1/12. A plum tree is 7 inches tall on the scale drawing. What is the actual height of th

Sedbober [7]

B. 84

The scale factor is 1/12 which means to get back to the actual height, you would multiply 7x12

7 0

3 years ago

Read 2 more answers

What is the area of this parallelogram?

Reptile [31]

Area of each triangle
(1/2)(7)(13) = 45.5
Both triangles = 91cm^2
Area of rectangle = 4 * 13 = 52
52cm^2 + 91cm^2 = 143cm^2
The area of the parallelogram is 143cm^2

7 0

3 years ago

Please help. Using the figure below, calculate the surface area and the volume. Show all of your work and round your answer to t

wlad13 [49]

Did you ever get the answers sis i need them

3 0

4 years ago

A garden snail travels 0.013 meters per second. If 1 meter = 39.37 inches, how fast is the snail traveling in miles per hour?

Eddi Din [679]

We are given

speed=0.013 m/s

so, we can also write as

$v=0.013\frac{m}{s}$

now, we can change it into miles/hour

so, we know that

1mile =1609.34 m

now, we can find for 1m

$1m=\frac{1}{1609.34} mile$

we know that

$1s=\frac{1}{3600}hr$

we can write our speed as

$v=0.013\frac{1m}{1s}$

we can plug values

$v=0.013\frac{\frac{1}{1609.34} mile}{\frac{1}{3600}hr}$

now, we can simplify it

so, we get

$v=0.02908mi/hr$ ...........Answer

5 0

3 years ago