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a_sh-v [17]
3 years ago
8

A phone company administers a survey, regarding customer satisfaction.

Mathematics
1 answer:
Aneli [31]3 years ago
3 0

Answer:

my opinion would be to use a larger sample size

(btw...u r not allowed to ask questions directly from ur assignment, quiz, etc. ,if u didnt know abt this...pls view the new honor code on this site)

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Simplify (1 − cos x)(1 + cos x).<br><br> 1<br> cos2 x<br> sin2 x<br> tan2 x
Phoenix [80]
Answer

The expression is equivalent to sin^{2}x

The first step is to multiply the two expressions between parentheses :
(II)
There is a trigonometric identity that states :

Working with this expression :
⇒
(I)
Using the equation (I) in (II) :
⇒


Read more on Brainly.com - brainly.com/question/3907632#readmore
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3 years ago
I NEED ANSWERS AND HOW DO I HSOW MY WORK FOR THIS HELP
lorasvet [3.4K]
The shaded area is 299.59un^2.

8 0
3 years ago
Please help.............
natta225 [31]

Answer:

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2(x + 2) + 2x = 20

6 0
3 years ago
Read 2 more answers
In a clinical test with 2161 subjects, 1214 showed improvement from the treatment. Find the margin of error for the 95% confiden
Vlad [161]

Answer:

The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is of:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

In a clinical test with 2161 subjects, 1214 showed improvement from the treatment.

This means that n = 2161, \pi = \frac{1214}{2161} = 0.5618

95% confidence level

So \alpha = 0.05, z is the value of Z that has a p-value of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Margin of error:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

M = 1.96\sqrt{\frac{0.5618*0.4382}{2161}}

M = 0.0209

The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

4 0
3 years ago
Look at the picture below to answer the question!! plss
laila [671]

Answer:

x = 15.3°

Step-by-step explanation:

Trig identities:

sin(x)=\dfrac{O}{H} \ \ \ \ \ cos(x)=\dfrac{A}{H} \ \ \ \ \ tan(x)=\dfrac{O}{A}

where

  • x = angle
  • O = side opposite the angle
  • A = side adjacent the angle
  • H = hypotenuse

sin(46)=\dfrac{11}{x}\\\\\implies x=\dfrac{11}{sin(46)}\\\\\implies x=15.3

8 0
2 years ago
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