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3 years ago

Explain why Josue is correct?

Mathematics

1 answer:

alexgriva [62]3 years ago

4 0

Because she did the math :)

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I don’t understand this I need help please

scoray [572]

The answer is B 2+(-35)

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3 years ago

Read 2 more answers

HELP ASAP EXTRA POINTS <br> -42-6n=-30 solve for n.

xz_007 [3.2K]

the answer to your question is n = -2

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3 years ago

83 random samples were selected from a normally distributed population and were found to have a mean of 32.1 and a standard devi

arlik [135]

Answer:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.525 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.127 \leq \sigma \leq 2.757$

Step-by-step explanation:

Information given

$\bar X=32.1$ represent the sample mean

$\mu$ population mean (variable of interest)

s=2.4 represent the sample standard deviation

n=83 represent the sample size

Confidence interval

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

The degrees of freedom given by:

$df=n-1=8-1=7$

The confidence level is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical values.

The excel commands would be: "=CHISQ.INV(0.05,82)" "=CHISQ.INV(0.95,82)". so for this case the critical values are:

$\chi^2_{\alpha/2}=104.139$

$\chi^2_{1- \alpha/2}=62.132$

The confidence interval is given by:

$\frac{(82)(2.4)^2}{104.139} \leq \sigma^2 \leq \frac{(82)(2.4)^2}{62.132}$

$4.525 \leq \sigma^2 \leq 7.602$

Now we just take square root on both sides of the interval and we got:

$2.127 \leq \sigma \leq 2.757$

5 0

3 years ago

PLEASE HELP MATH TEST SOON

Sav [38]

Answer:

The answer is A.16

Step-by-step explanation:

2.5/0.4= 6.25

100/6.25= 16

6 0

3 years ago

Which algebraic expression is a polynomial?

Veronika [31]

Answer:

the second one

Step-by-step explanation:

7 0

3 years ago