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3 years ago

A sample proportion is always equal to the corresponding population proportion

Mathematics

1 answer:

UNO [17]3 years ago

4 0

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Find the value of 85²-15² using the difference of two squares method

Mekhanik [1.2K]

Answer:

$7000$

Step-by-step explanation:

Recall the form of the difference of squares.

$x^2 - y^2 = (x+y)(x-y)\\\\\\$

Now let's apply it to your numbers:

$85^2 - 15^2 = (85 + 15)(85 - 15)$

Simplify:

$(100)(70) = 7000$

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3 years ago

6,8,10,11. 12, 14, 18, 18,30<br> Create a box plot to display the data.

34kurt

Answer:

dunny but 4950

Step-by-step explanation:

4960-

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4 years ago

Find two numbers whose sum is 1 and whose difference is -3.<br> Your answer is:

podryga [215]

Answer:

-2 -4

Step-by-step explanation:

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3 years ago

Read 2 more answers

A service station will be built on the highway, and a road will connect it with cray. How long will the new road be?

zysi [14]

Answer: 4.6 mi

Step-by-step explanation:

Suppose the points A, B, C and S shows Alba, Blare, Cray and Service station respectively,

Then, We have to find out the line segment CS = x = ?

Now, In the triangles ACB and CSB,

$\angle ACB\cong \angle CSB$ ( Right angles )

$\angle ABC\cong \angle CBS$ ( Reflexive angles )

Thus, by AA similarity postulate,

$\triangle ACB\sim\triangle CSB$

By the property of similar triangles,

$\frac{AB}{CB}=\frac{AC}{CS}$

$\implies \frac{13}{5}=\frac{12}{x}$

$\implies 13x=5\times 12$

$\implies 13x = 60$

$\implies x =\frac{60}{13}=4.61539\approx 4.6$

Hence, the approximate length of the new road = 4.6 miles

3 0

3 years ago

A screening examination was performed on 250 persons for Factor X, which is found in disease Y. A definitive diagnosis for disea

ZanzabumX [31]

Answer:

The specificity of this test is expressed as:________

70%.

Step-by-step explanation:

a) Data and Calculations:

TEST RESULTS Disease Present Disease Absent Total

Positive for Factor X 40 60 100

Negative for Factor X 10 140 150

Total 50 200 250

Negative for X and Disease Absent = 140/200 * 100

= 0.7 * 100

= 70%

b) The specificity refers to the percentage of people who test negative for a specific disease among a group of people who do not have the disease. No test is 100% specific because some people who do not have the disease X will test positive for it (false positive). Therefore, we are testing for the true negative, that the 140 people who tested out of the 200 people who do not have the disease.

8 0

3 years ago