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3 years ago

1,00+ 1,00+2,00+3,00+4_00

Mathematics

1 answer:

Flura [38]3 years ago

4 0

Well you would have to fill in the bank so it would be 4000 and the answer would be 11,000 <span />

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A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 340 babies were born, a

Bas_tet [7]

Answer:

The 99% confidence interval estimate of the percentage of girls born is (0.8, 0.9).

b)Yes, the proportion of girls is significantly different from 0.5.

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:

In the study 340 babies were born, and 289 of them were girls. This means that $n = 340, \pi = \frac{289}{340} = 0.85$

Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born.

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:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{340}} = 0.85 - 2.575\sqrt{\frac{0.85*0.15}{400}} = 0.80$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{340}} = 0.85 + 2.575\sqrt{\frac{0.85*0.15}{400}} = 0.90$

The 99% confidence interval estimate of the percentage of girls born is (0.8, 0.9).

Does the method appear to be effective?

b)Yes, the proportion of girls is significantly different from 0.5.

4 0

3 years ago

Name the place of the highlighted digit

enot [183]

Can't answer without a picture

3 0

3 years ago

Mary bought a handbag for 15.00naira. if she sold it for 18.00,what was her percentage gain?

melomori [17]

Answer:

total profit gained = 20%

Step-by-step explanation:

profit = SP - CP = 18 - 15 = 3 naira

total profit percentage =

( profit / CP ) × 100
3 / 15 × 100
20%

hence her total percentage gain was 20%

8 0

3 years ago

What is 42÷(15-2 by the power of 3<br><img src="https://tex.z-dn.net/?f=42%20%5Cdiv%2815%20-%202%20%7B%7D%5E%7B3%7D%20%29" id="T

tigry1 [53]

Answer: 6

Explanation: first you have to get rid of the 2 power of 3, 2 x 2 x 2 is 8. Then 15-8=7. Then 42➗7 is 6

4 0

3 years ago

HELP ASAP PLZ THNZS!!! ( There r 2 questions)

forsale [732]

Answer:

Step-by-step explanation:

1. Answer below

$2x = \sqrt[3]{125}$

$2x = 5$

$x = \frac{5}{2}$

$x = 2.5$

2. Answer below

$x + 3^{2} = \sqrt[3]{27}$

$x + 9 = 3$

$x = -6$

6 0

3 years ago