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2 years ago

15PTS PLEASE HELP ASAP! (dont write random answers pls) look at the pic attached:

Mathematics

1 answer:

LenKa [72]2 years ago

7 0

Answer:

b) 1000m

Step-by-step explanation:

the law of sines.

you know all the angles and the length of the side a

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There are 7 people staying in 4 cabins near the lake. What is the total number of people staying near the lake?

Sholpan [36]

Is this a truck question?

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3 years ago

A-2b, If a = - 2.5, b = - 3.3

lorasvet [3.4K]

Answer:

-2.5 - 2(-3.3)

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8 0

3 years ago

Show numerically and explain your answer explain (-2)+5 in I need help

Korvikt [17]

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4 0

3 years ago

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solniwko [45]

Step-by-step explanation:

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3 years ago

A researcher wishes to estimate, with 99% confidence, the population proportion of adults who think the president of their co

scoray [572]

Answer:

a. n=4148

b. n=3909

c. The sample size is smaller if a known proportion from prior study is used. The difference in sample sizes is 239

Step-by-step explanation:

a. For sample where no preliminary estimate is given, the minimum sample size is calculated using the formula:

$n=p(1-p)(\frac{z}{ME})^2$

Where:

$ME=$ Margin of error
$p=$ is the assumed proportion

#Let p=0.5, substitute in the formula to solve for n:

$n=0.5(1-0.5)\times (2.576/0.02)^2\\\\=4147.36\approx 4148$

Hence, the minimum sample size is 4148

b. If given a preliminary estimate p=0.38, we use the same formula but substitute p with the given value:

$n=p(1-p)(z/ME)^2\\\\=0.38(1-0.38)(2.576/0.02)^2\\\\=3908.47\approx3909$

Hence, the minimum sample size is 3909

c. Comparing the sample sizes from a and b:

$n_{0.5}>n_{0.38}\\\\n_{0.5}-n_{0.38}=4148-3909=239$

Hence, the actual sample size is smaller for a known proportion from prior a prior study.

8 0

3 years ago