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3 years ago

3x + y = 5 sustitución -1

Mathematics

1 answer:

scoray [572]3 years ago

7 0

Step-by-step explanation:

your answer is wrong because 3 x + 5 can I give you sorry 3 x + y cannot give you five

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Slope of the points (11,-20) and (3,-20)

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A marketing researcher wants to find a 96% confidence interval for the mean amount those visitors spend per person per day while

ki77a [65]

Answer:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

Step-by-step explanation:

Notation

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

$\mu$ population mean (variable of interest)

$\sigma=12$ represent the population standard deviation

n represent the sample size

ME = 4 the margin of error desired

Solution to the problem

When we create a confidence interval for the mean the margin of error is given by this formula:

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

And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

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

The critical value for 96% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=1-0.96 =0.04$ . And in excel we can use this formula to find it:"=-NORM.INV(0.02;0;1)", and we got $z_{\alpha/2}=2.054$ , replacing into formula (b) we got:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

5 0

3 years ago

What is the value of the expression below? (-64)^4/3<br>a.4<br>b.64<br>c.256<br>d.16

Marina CMI [18]

Answer:

the correct answer is D

Step-by-step explanation:

64^(4/6) = 16

hope this helps

plz mark brainliest

8 0

2 years ago

3x + y = 5 sustitución -1​

3x + y = 5 sustitución -1