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Ivan
4 years ago
11

g True or False: A sample of size 25 provides a sample variance of 400. The standard error in this case, equal to 4, is best des

cribed as the estimate of the standard deviation of means calculated from sample of size 25.
Mathematics
1 answer:
Tpy6a [65]4 years ago
3 0

Answer:

True.

Step-by-step explanation:

If we have for a sample of size n=25 a sample variance of 400, the standard error can be written as:

\sigma_s=\dfrac{\sigma}{\sqrt{n}}=\dfrac{\sqrt{400}}{\sqrt{25}}=\dfrac{20}{5}=4

This way of calculating the standard error is the same used for estimating the standard deviation of the sample means for samples of size n=25.

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MAPS On a map, Wilmington Street, Beech Drive, and Ash Grove Lane appear to all be parallel. The on
joja [24]

The distance between the two streets along Kendall is 347.9 feet.

Solution:

The image of the problem is attached below.

Distance between Wilmington to Ash Grove along Kendall = 820 feet

Distance between Wilmington to Ash Grove along Magnolia = 660 feet

Distance between Beech and  Ash Grove along Magnolia = 280 feet

Distance between Wilmington to Beech along Magnolia

                                       = 660 feet – 280 feet

                                       = 380 feet

Let us x be the distance between Wilmington to Beech along Kendall and

820 – x be the distance between Beech and  Ash Grove along Kendall.

The given streets are parallel.

By proportionality theorem, parallel lines cut by a transversal are in proportion.

$\Rightarrow\frac{380}{280} =\frac{x}{820-x}

Do cross multiplication.

$\Rightarrow{380}({820-x}) =280x

$\Rightarrow 311600-380x =280x

$\Rightarrow 311600 =280x+380x

$\Rightarrow 311600 =660x

$\Rightarrow x=472.1

Distance between Beech and  Ash Grove along Kendall          

                                    = 820 – x  

                                    = 820 – 472.1

                                    = 347.9

Hence the distance between the two streets along Kendall is 347.9 feet.

8 0
3 years ago
DESPERATELY NEED HELP!! TANGENT LINES WHAT IS THE PERIMETER?!
Vladimir [108]

Each pair of tangents to a point makes two congruent segments to the circle.  So if we label all the little segments, say clockwise starting at the top, we get

27, 22, 22, 98, 98, 22, 22, 27

The sum is 338

Answer: 338 in


3 0
4 years ago
8 cm equals how many millimeters
pychu [463]
8CM is equivalent to 80 millimeters
4 0
4 years ago
David wants to install a fence around his garden. The garden is rectangular and has an area of 240 square feet. One side of the
oee [108]

Answer:

$996

Step-by-step explanation:

The rectangular plot has an area that is the product of its length and width. We are given the width as 12 feet, and the area as 240 ft², so we can find the length from ...

... A = L×W

... 240 ft² = L×(12 ft)

... 240 ft²/(12 ft) = L = 20 ft

Opposite sides of the rectangle are the same length, so the cost of fence for a side of a given length will be the sum of the costs of the opposites sides.

The 12 ft side has one segment that is $18 per foot, and one that is $15 per foot. For the 20 ft sides, both are $15 per foot. Then the total cost can be figured from ...

... (12 ft)·($18/ft + $15/ft) + (20 ft)·($15/ft +$15/ft) = 12·$33 +20·$30 = $996

5 0
3 years ago
Let f(x) = −4(0.25)^x. The graph of g(x) = f(x)+k is shown below. Identify the value of k. k=
Nataliya [291]
You can use photomath it is a great app to find ONLY equations!
8 0
3 years ago
Read 2 more answers
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