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4 years ago

PLEASE HELP ASAP 25 PTS + BRAINLIEST TO RIGHT/BEST ANSWER

Mathematics

1 answer:

vova2212 [387]4 years ago

3 0

⭐Hola User_____________

⭐Here is Your Answer..!!

______________________

↪COMPLEX NUMBERS

↪usually in the complex form , the real numbers gets added to real number and the imaginary number gets added to the imaginary number

↪thus

↪(a+ib) + ( x+iy)= ( a+x) + i (b+y)

↪thus here

↪(-5+2i) + ( 3-6i)

=》 ( -5 + 3) + i ( 2-6)

=》 -2 +i (-4)

=》 -2 -4i

↪thus the answer is -2-4i

________________________

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Hi , the answer I choose was wrong , what is the correct answer ? Will choose brainlest so be quick

photoshop1234 [79]

Answer:

Hypotenuse-Leg

Step-by-step explanation:

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3 years ago

A business school has a goal that the average number of years of work experience of its MBA applicants is more than three years.

gizmo_the_mogwai [7]

Answer:

$z=\frac{3.1-3}{\frac{2.449}{\sqrt{47}}}=0.280$

$p_v =P(z>0.280)=0.390$

If we compare the p value and the significance level assumed $\alpha=0.01$ we see that $p_v>\alpha$ so we can conclude that we have enough evidence to fail reject the null hypothesis, so we can't conclude that the height of men actually its NOT significant higher than 0.3 at 1% of signficance.

Step-by-step explanation:

Data given and notation

$\bar X=3.1$ represent the sample mean

$\sigma=\sqrt{6}$ represent the sample standard deviation for the sample

$n=47$ sample size

$\mu_o =3$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is higher than 3, the system of hypothesis would be:

Null hypothesis: $\mu \leq 3$

Alternative hypothesis: $\mu > 3$

If we analyze the size for the sample is > 30 and we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{3.1-3}{\frac{2.449}{\sqrt{47}}}=0.280$

P-value

Since is a one side test the p value would be:

$p_v =P(z>0.280)=0.390$

Conclusion

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3 years ago

Find C. Show working out.

GREYUIT [131]

Hopefully this helps, I have tried to write out all reasoning