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trapecia [35]
3 years ago
11

g An article reported the results of a survey of 400 elementary school teachers and 500 high school teachers. Of the elementary

school teachers, 100 said they were very satisfied with their jobs, whereas 200 of the high school teachers were very satisfied with their work. We wish to do hypothesis testing to check that true proportion of elementary school teachers and high school teachers who were very satisfied with their jobs differs from each other. Write the formula and calculate the value of the estimate of the standard error of the sample statistics, you would use in finding test statistic, assuming null hypothesis is true. ( Round your answer to 3 decimal places)
Mathematics
1 answer:
daser333 [38]3 years ago
4 0

Answer:2020

Step-by-step explanation:horrible year just grinding points btw

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Solve x^2+20x+100=50
uysha [10]
1. You con solve the quadratic equation x^2+20x+100=50<span> by following the proccedure below:
 
 2. Pass the number 50 from the right member to the left member. Then you obtain:
 
 x^2+20x+100-50=0
</span><span> x^2+20x+50=0
</span><span> 
 3. Then, you must apply the quadratic equation, which is:
 
 x=(-b±√(b^2-4ac))/2a
 
 </span><span>x^2+20x+50=0
</span><span> 
 a=1
 b=20
 c=50
 

  4. Therefore, when you substitute the values into the quadratic equation and simplify ir, you obtain that the result is:
 
  -10</span>±5√2   (It is the last option).
6 0
3 years ago
BD = 53, AC = 45 &amp; DA = 87. Find BC
Musya8 [376]

Answer:

the answer is differently C

4 0
3 years ago
How do you solve the equation 2cos^2 - cosx = 0 for all solutions?
exis [7]

Answer:

<em>π/2 and π/3</em>

Step-by-step explanation:

Given the equation 2cos²x - cosx = 0, to find the solution to the equation, we will follow the following step.

let P = cosx

The equation becomes 2P²-P = 0

P(2P-1) = 0

P = 0 and 2P-1 = 0

P= 0 and P = 1/2

Since P = cosx

cosx = 0 and cos(x) =  1/2

If cos(x) = 0

x = cos⁻¹0

x = 90⁰

x = π/2

If cos(x) = 1/2

x = cos⁻¹1/2

x = 60⁰

x = π/3

<em>Hence the solutions to the equation are π/2 and π/3.</em>

7 0
3 years ago
The wettest U.S. city is Mobile, Alabama. The city's chance of rain is 16%. out of a 14- day period, about how many rainy days w
forsale [732]
The answer should B. 2 because 14/100 is equal to x/14. Simplified it is 100x/100=196/100. 196 divided by 100 equals 1.96 which rounds to 2.
7 0
3 years ago
Simplify the expression (2 square root sign 27) - (3 square root sign 32)
monitta

Answer:

3\sqrt{3} - 4\sqrt{2}

Step-by-step explanation:

The expression (2 square root sign 27) - (3 square root sign 32) is 2\sqrt{27} - 3\sqrt{32}.

To simplify, simplify inside the radicals by removing perfect square factors.

\sqrt{27} =\sqrt{9*3} =3\sqrt{3}

\sqrt{32} =\sqrt{16*2} =4\sqrt{2}

The expression becomes 3\sqrt{3} - 4\sqrt{2}.

This cannot be simplified anymore because whats under the radical is not the same.

6 0
3 years ago
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