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3 years ago

What - |3| math evaluate absolute value

1 answer:

7 0

The answer is -3, because the negative sign is outside of the absolute value. If the problem looked like this |-3|, then the answer would be 3. To clarify, your answer is -3.

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I have no idea how to do this question

Korvikt [17]

I know this doesn't really help but... Good luck on the test!! And also I'm pretty sure they have youtube vids on how to do this stuff. Well, anyway bye!!! Good luck!!!

4 0

3 years ago

I solved this answer already and I got 43, but I don’t know if it’s correct so

faltersainse [42]

Answer:

= 43

Step-by-step explanation:

{7 × $2^{3}$ - 7} -2 ×3

Solve the brackets first

{7 × 8 - 7} -2 ×3

{56 - 7} -2 ×3

49 -2 ×3

49 -6

= 43

you are right

8 0

3 years ago

A publishing company claims that in fall 2019, the average price of college textbooks for a single semester is $385. Suppose you

hram777 [196]

Answer:

We accept H₀ . We don´t have enough evidence to express the publisher claim is not true

Step by Step explanation:

We must evaluate if the mean of the price of college textbooks is different from the value claimed by the publisher

n < 30 then we must use t - distrbution

degree of freedom n - 1 df = 22 - 1 df = 21

As the question mentions " different " that means, a two-tail test

At 0,01 significance level α = 0,01 α/2 = 0,005

and t(c) = 2,831

Test Hypothesis

Null Hypothesis H₀ μ = μ₀

Alternative hypothesis Hₐ μ ≠ μ₀

To calculate t(s)

t(s) = ( μ - μ₀ ) /σ/√n

t(s) = ( 433,50 - 385 ) / 86,92 / √22

t(s) = 2,6171

Comparing t(c) and t(s)

t(s) < t(c)

Then t(s) is in the acceptance region we accept H₀. We don´t have enough evidence to claim that mean price differs from publisher claim

6 0

3 years ago

I am working on a statistical test problem. I have been given salaries for 2017 and 2018 years for Los Angeles County, approxima

dalvyx [7]

Answer:

I DONT KNOW THAT

Step-by-step explanation:

7 0

3 years ago

50 random teenagers were asked how many hours a day they use their phone. They spent an average of 7 hours a day with a standard

tatyana61 [14]

Answer:

The margin of error for the true mean number of hours a teenager spends on their phone is of 0.4 hours a day.

Step-by-step explanation:

We have the standard deviation of the saple, so we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 50 - 1 = 49

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 49 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.95}{2} = 0.975$ . So we have T = 2

The margin of error is:

$M = T\frac{s}{\sqrt{n}} = 2\frac{1.3}{\sqrt{50}} = 0.4$

In which s is the standard deviation of the sample and n is the size of the sample.

The margin of error for the true mean number of hours a teenager spends on their phone is of 0.4 hours a day.

4 0

3 years ago