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3 years ago

PLEASE HELP ASAP WILL GIVE BRAINLEAST!!!!!!!

Mathematics

1 answer:

LekaFEV [45]3 years ago

3 0

Answer:

Answer is C and E!

-Sumin <3

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A survey conducted in July 2015 asked a random sample of American adults whether they had ever used online dating (either an onl

Natasha2012 [34]

Answer:

The 99% confidence interval is (0.0787, 0.1613).

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 interval 1-\alpha, we have the following confidence interval of proportions.

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

In which

Z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

The survey included 411 adults between the ages of 55 and 64, and 50 of them said that they had used online dating. This means that $n = 411, \pi = \frac{50}{411} = 0.12$

The 99% confidence interval is

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 - 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.0787$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 + 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.1613$

The 99% confidence interval is (0.0787, 0.1613).

3 0

4 years ago

Solve the inequality -4>-4 + h. A. h<0 B. h>0 C. h<3 D. h> -8

k0ka [10]

Answer:

A. h>0

Step-by-step explanation:

8 0

4 years ago

HELP PLZ! please answer 13 and 14.

AURORKA [14]

13. The words are telling you
.. HT +TS = HM +MS +2
.. (2x +1) +(x) = (x +1) +(x +2) +2
.. 3x +1 = 2x +5 . . . . . . . . . . . . . . collect terms
.. x = 4 . . . . . . . . . . . . . . . . . . . . . add -2x-1

HT +TS = 3x +1 = 3*4 +1 = 13 miles

The route via the theater is 13 miles.
Via the mall, the route is 11 miles.

14. Solve this the way you would any 2-step linear equation. Subtract terms that don't have h, and divide by the coefficient of h.

S = 2πr^2 +2πrh
S -2πr^2 = 2πrh
(S -2πr^2)/(2πr) = h

If you like, you can rearrange this to
.. h = (S/(2πr)) -r

3 0

4 years ago

Find the total balance of each investment account earning simple annual interest.

Crazy boy [7]

Answer:

If my memory for this is correct, the answer should be:

1. 717.60

2. 9311.20

3. 1067.40

4. 380.60

Step-by-step explanation:

7 0

3 years ago

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PLZ, HURRY WILL GIVE BRAINILEST TO CORRECT ANSWER!

Sergeeva-Olga [200]

Answer:

c 4/5

Step-by-step explanation:

marry chrismas

6 0

3 years ago

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