Drag the correct steps into order to evaluate 42 + t6 for t = 12.

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 380 babies were born, a

Alex Ar [27]

Answer:

The 99% confidence interval estimate of the percentage of girls born is (86.04%, 93.96%). Considering the actual percentage of girls born is close to 50%, the percentage increased considerably with this method, which means that it appears effective.

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 $1 - \frac{\alpha}{2}$ .

In the study 380 babies were born, and 342 of them were girls.

This means that $n = 380, \pi = \frac{342}{380} = 0.9$

99% confidence level

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

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 - 2.575\sqrt{\frac{0.9*0.1}{380}} = 0.8604$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.9 + 2.575\sqrt{\frac{0.9*0.1}{380}} = 0.9396$

As percentages:

0.8604*100% = 86.04%.

0.9396*100% = 93.96%.

The 99% confidence interval estimate of the percentage of girls born is (86.04%, 93.96%). Considering the actual percentage of girls born is close to 50%, the percentage increased considerably with this method, which means that it appears effective.

4 0

3 years ago

What is the area of 4/5 and 1/10

julsineya [31]

Answer:

2/25. Hope this helps :) :) :) :)

6 0

3 years ago

(450) + (28.75x) = 967.50<br> solve for x

Galina-37 [17]

Answer:

18

Step-by-step explanation:

Hello,

In order to solve for x, we need to isolate the variable on one side of the equation.

To do this, we subtract 450 from both sides of the equation, and this will give you:

28.75x = 517.5

As mentioned, we need to isolate x, so we divide both sides by 28.75. This will give the following.

x = 18

Hope this helps!

4 0

3 years ago

Ax- bx > 2a-2b<br><br>solve for x

Dima020 [189]

Answer:

If a<b, x<2

If a>b, x>2

Step-by-step explanation:

ax-bx>2a-2b, (a-b)x>2(a-b)

If a>b, x>2(a-b)/(a-b)=2

If a<b, x<2(a-b)/(a-b)=2

3 0

3 years ago

Help me please I need it by tommrow u get brai nlist

lakkis [162]

Answer:

92905

Step-by-step explanation:

27,500=0.296e

29.6%=0.296

27,500/0.296 =e

e rounded to the nearest whole number is 92,905

4 0

3 years ago