All categories

3 years ago

What is wrong with the equation below? |x|= -3

Mathematics

1 answer:

amm18123 years ago

7 0

Answer:

In mathematics, the absolute value or modulus of a real number x, denoted |x|, is the non-negative value of x without regard to its sign.

You might be interested in

A researcher is concerned about the impact of students working while they are enrolled in classes, and she likes to know if stud

8_murik_8 [283]

Answer:

(a) Point estimate = 7.10

(b) The critical value is 1.960

(d) Confidence Interval = (6.3, 7.9)

(e) We are 90% confident that the average number of hours worked by the students is between 6.3 and 7.9

Step-by-step explanation:

Given

$\bar x = 7.10$ -- sample mean

$\sigma=5$ --- sample standard deviation

$n = 150$ --- samples

Solving (a): The point estimate

The sample mean can be used as the point estimate.

Hence, the point estimate is 7.10

Solving (b): The critical value

We have:

$CI = 90\%$ --- the confidence interval

Calculate the $\alpha$ level

$\alpha = 1 - CI$

$\alpha = 1 - 90\%$

$\alpha = 1 - 0.90$

$\alpha = 0.10$

Divide by 2

$\frac{\alpha}{2} = 0.10/2$

$\frac{\alpha}{2} = 0.05$

Subtract from 1

$1 - \frac{\alpha}{2} = 1 - 0.05$

$1 - \frac{\alpha}{2} = 0.95$

From the z table. the critical value for $1 - \frac{\alpha}{2} = 0.95$ is:

$z = 1.960$

Solving (c): Margin of error

This is calculated as:

$E = z * \frac{\sigma}{\sqrt n}$

$E = 1.960 * \frac{5}{\sqrt {150}}$

$E = 1.960 * \frac{5}{12.25}$

$E = \frac{1.960 *5}{12.25}$

$E = \frac{9.80}{12.25}$

$E = 0.800$

Solving (d): The confidence interval

This is calculated as:

$CI = (\bar x - E, \bar x + E)$

$CI = (7.10 - 0.800, 7.10 + 0.800)$

$CI = (6.3, 7.9)$

Solving (d): The conclusion

We are 90% confident that the average number of hours worked by the students is between 6.3 and 7.9

6 0

3 years ago

WHO TRYING TO BE LIKE THIS ⁉️

Anarel [89]

Answer:

not me!

Step-by-step explanation:

3 0

3 years ago

If answer is correct I will mark as brainliest.

Ilia_Sergeevich [38]

Answer:

No positive real solutions.So the answer is zero.

Step-by-step explanation:

8 0

3 years ago

A company that translates books between various languages is currently testing a computer-based translation service. The founde

maria [59]

Step-by-step explanation:

this is the answer of this question

8 0

3 years ago

PLEase hurry please hURyy plaese hurry

steposvetlana [31]

<h2><u>PLEASE MARK BRAINLIEST!</u></h2>

Answer:

All these answers are correct. I triple - checked!

Step-by-step explanation:

In order from questions asked top - to - bottom:

First question:

23 businesses

Second question:

18 businesses

Third question:

14 businesses

Fourth question:

6 businesses

I hope this helps!

- sincerelynini

6 0

3 years ago