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mr_godi [17]
3 years ago
5

How do you write " h ft above sea level" and "d dollars for b books" in an expression

Mathematics
1 answer:
alukav5142 [94]3 years ago
8 0
H+ or just H D per b Or dollars per books
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How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the populati
marshall27 [118]

Using the z-distribution, it is found that a sample of 171 should be selected.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

\overline{x} \pm z\frac{\sigma}{\sqrt{n}}

The margin of error is:

M = z\frac{\sigma}{\sqrt{n}}

In which:

  • \overline{x} is the sample mean.
  • z is the critical value.
  • n is the sample size.
  • \sigma is the standard deviation for the population.

For this problem, the parameters are:

z = 1.96, \sigma = 40, M = 6

Hence we solve for n to find the needed sample size.

M = z\frac{\sigma}{\sqrt{n}}

6 = 1.96\frac{40}{\sqrt{n}}

6\sqrt{n} = 40 \times 1.96

\sqrt{n} = \frac{40 \times 1.96}{6}

(\sqrt{n})^2 = \left(\frac{40 \times 1.96}{6}\right)^2

n = 170.7.

Rounding up, a sample of 171 should be selected.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0
2 years ago
5 3/4÷5/9<br>what's answer​
anastassius [24]
The answer to the math problem is 10.35
5 0
2 years ago
Read 2 more answers
Find the product of (2/3)x and (1/2x²)+6x-3​
kvasek [131]

Answer:

=

1

2

x2+

20

3

x−3

Step-by-step explanation:

3 0
2 years ago
How many are 16 x 16 ?​
timofeeve [1]

Answer:

256

Step-by-step explanation:

16 ×16= 256

Hope it works out for you

8 0
3 years ago
Simplify this equation<br> (3X^2+21X+33)/(X+5)
Amiraneli [1.4K]

Answer:

(3x^2+21x+33) / (x+5)

You can use long division:

(3x^2+21x+33)

--------------------

       (x+5)

=3x+6+ 3/x+5

Step-by-step explanation:

6 0
2 years ago
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