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3 years ago

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What number would make this equation true?

1 answer:

stepladder [879]3 years ago

7 0

Answer

A is the answer

Step-by-step explanation:

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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

A coroner arrives at a murder scene at 10p.m. She finds the temperature of the body to be 86.3 degrees F. She waits one hour, t

hram777 [196]

5 - 6 pm

if the temperature drops 3 degrees per hour. so how many hours would it take to go from 98.6 to 86.3

98.6-86.3=12.3

3 goes into 12 4 times.

10 pm - 4 hours is 6pm.

if you figure in the .3

you come to approximately 5pm

7 0

3 years ago

CHALLENGE FOR YOU COLLEGE PEOPLE<br> What is (5a -7b + 3) + (2a - 6b + 5c - 12)?

Angelina_Jolie [31]

Answer:

7a-13b+5c-9

Hope this helps

7 0

2 years ago

Find an equation of the line that has a slope of -5 and a y intercept of 8. Write your answer in the form y = m x + b .

Semenov [28]

answer: required equation is y=-5x+8

Step-by-step explanation:

required equation is y=mx+b

where m= slope of line b= y intercept of line

put the value of m and b

required equation is y=mx+b

y=-5x+8

7 0

3 years ago

Which equation represents a line with a slope of -8 and

masha68 [24]

Answer: A. y = -8x + 4 because the slope goes in front with the x (-8x) and the y intercept is after the slope (4)

4 0

3 years ago