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FromTheMoon [43]
3 years ago
15

PLEASEEEE HELP ITS URGENT!!!!

Mathematics
1 answer:
Marrrta [24]3 years ago
7 0

Answer:

f(x)=1/2x-6

Step-by-step explanation:

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In a survey, the planning value for the population proportion is . How large a sample should be taken to provide a confidence in
tatuchka [14]

Answer:

n=350

Step-by-step explanation:

Notation and definitions

n random sample taken  (variable of interest)

\hat p=0.35 estimated proportion  (value assumed)

p true population proportion

Confidence =0.95 or 95% (value assumed)

Me=0.05 (value assumed)

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".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.05 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

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

And replacing into equation (b) the values from part a we got:

n=\frac{0.35(1-0.35)}{(\frac{0.05}{1.96})^2}=349.586  

And rounded up we have that n=350

4 0
2 years ago
The tech ed teacher needs to cut boards for the 6th grade propeller project that are 3/4 feet long.How many propellers can he ge
QveST [7]

Answer:

  zero

Step-by-step explanation:

1/2 feet is less than 3/4 feet, so is insufficient length for even one propeller. No propellers can be cut from the board.

5 0
2 years ago
Elliott buys a TV. The receipt says that the total of the TV is $252.99, including sales tax. The original price (without tax) o
postnew [5]

Answer:

8%

Step-by-step explanation:

234.25$ : 100 = 252.99$ : x

234.25x = 252.99 x 100

234.25x = 25299

25299 divided by 234.25 is 108

so answer 8%

6 0
3 years ago
PLZ HELP ME IM desperate!!!!<br> When writing a rebuttal, what is the exact phrasing we use?
vazorg [7]

1) Always be polite and professional.

2) Specifically address the points that you disagree with.

3) Provide Evidence.

4) Close with a brief summary of your rebuttal.

7 0
2 years ago
Read 2 more answers
Find the simple interest paid after 3 years on a loan of $9700 borrowed at an annual interest rate of 11%
Paladinen [302]

9700*11%=1067

you owe $1067 in interest in one year, so $1067*3 years=$3207 in interest for three years

you'll have to pay $3207 in interest on top of the $9700 you already owe

4 0
3 years ago
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