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2 years ago

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What is this math answer

1 answer:

Lynna [10]2 years ago

7 0

Answer:

$n = 8$

Step-by-step explanation:

<h2> $\frac{n}{4} + 15 = 17$ </h2><h2> $\frac{n}{4} = 7 - 5$ </h2><h2> $\frac{n}{4} = 2$ </h2><h3> $n = 4 \times 2$ </h3><h3> $n = 8$ </h3><h3>Hope it is helpful....</h3>

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One person wants to get a 95% z-confidence interval with a margin of error of at most 15 based on a population standard deviatio

Bess [88]

Answer:

$n=(\frac{1.96(60)}{15})^2 =61.46 \approx 62$

So the answer for this case would be n=62 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean

$\sigma=60$ represent the population standard deviation

n represent the sample size (variable of interest)

Confidence =95% or 0.95

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (1)

And on this case we have that ME =15, and we are interested in order to find the value of n, if we solve n from equation (1) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (2)

The critical value for 95% of confidence interval is provided, $z_{\alpha/2}=1.96$ , replacing into formula (2) we got:

$n=(\frac{1.96(60)}{15})^2 =61.46 \approx 62$

So the answer for this case would be n=62 rounded up to the nearest integer

6 0

3 years ago

The solution of the equation 2d - 6 = 5 is _____.

xeze [42]

Answer: d = 11/2 or 5 1/2

Step-by-step explanation:

2d - 6 = 5

+ 6 + 6

2d = 11

/2 /2

d = 11/2 or 5 1/2

7 0

2 years ago

Read 2 more answers

nasty-shy [4]

Answer:

Z

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x

Step-by-step explanation:

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5 0

2 years ago

Haruka hiked several kilometers in the morning. She only hiked 6 kilometers in the afternoon, which was 25% less she had hiked i

SOVA2 [1]

WEW can use a simple equation to solve this

Let x be the number of kilometers she hiked in the morning . Then

x - 0.25x = 6 (Note 0.25 = 25 %)

0.75x = 6

x = 6 / 0.75 = 8 kilometers answer

4 0

3 years ago

Which value for x completes the conditional relative frequency table by column? 0.17 0.25 0.40 0.85

Alchen [17]

The value of x that completes the conditional relative frequency table by column is 0.85

<h3>How to determine the value of x?</h3>

From the complete question, we have the following column elements

0.15 x 1

Express a sum

0.15 + x = 1

Subtract 0.15 from both sides

x = 0.85

Hence, the value of x that completes the conditional relative frequency table by column is 0.85

Read more about conditional relative frequency at:

brainly.com/question/22728236

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4 0

1 year ago