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3 years ago

8

Help me out! Please!!!!!!!!

2 answers:

gladu [14]3 years ago

4 0

I would say the answer is D i and ii

Natasha2012 [34]3 years ago

3 0

The answer is letter C

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Heart failure is due to either natural occurrences (86%) or outside factors (14%). Outside factors are related to induced substa

gayaneshka [121]

<span>Given are the following data:

Heart failure causes:

84% natural occurence
16% outside factors
18 individuals (sample size)

1. What is the probability that 3 individuals have conditions caused by outside factors?

Probability = 3/18 * 0.16 = 0.0267 or 2.67%

</span><span /><span>
</span>

7 0

3 years ago

A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. A previous study indicates that the propo

never [62]

Answer:

A sample of 997 is needed.

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:

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

A previous study indicates that the proportion of left-handed golfers is 8%.

This means that $\pi = 0.08$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a p-value of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

How large a sample is needed in order to be 98% confident that the sample proportion will not differ from the true proportion by more than 2%?

This is n for which M = 0.02. So

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

$0.02 = 2.327\sqrt{\frac{0.08*0.92}{n}}$

$0.02\sqrt{n} = 2.327\sqrt{0.08*0.92}$

$\sqrt{n} = \frac{2.327\sqrt{0.08*0.92}}{0.02}$

$(\sqrt{n})^2 = (\frac{2.327\sqrt{0.08*0.92}}{0.02})^2$

$n = 996.3$

Rounding up:

A sample of 997 is needed.

3 0

3 years ago

What number is being factored in this factor tree? <br><br>A.72<br> B.180 <br>C.216<br> D.324

Tatiana [17]

Answer:

not sure if it's ryt but I think it's A

7 0

3 years ago

Please help using the picture below I need the surface area I also need an explanation

Taya2010 [7]

Answer:

155

Step-by-step explanation:

5*5=25

((5*13)/2)*4=130

130+25=155

6 0

2 years ago

The actual distance between two villages is 120 kilometers. On a map of the area, 0.5 centimeter represents 2 kilometers.

stira [4]

Answer:

30 centimeters

Step-by-step explanation:

120 ÷2 =60 now you must use only .5 of that number so you have thirty

3 0

2 years ago