Question

A die has 2 red faces, 2 blue faces, and 2 green faces. It is rolled 240 times. Let R be the number of times red faces appear, and B the number of times blue faces appear.
The random variable R is the sum of 240 draws at random with replacement from

[pick all that are correct]
red, red, blue, blue, green, green
red, 0, 0
1, 0, 0, 0, 0, 0
1, 1, 0, 0, 0, 0
1, 0, 0 0, 1, 0
1, -1, 0, 0, 0, 0
1, 1, -1, -1, 0, 0
1, -1, 0
.......................
Consider the random variable D = R - B. That’s D for “difference.” If all 240 rolls show blue faces, then D = -240; if they all show red faces, then D = 240; otherwise D is somewhere in between. The random variable D is the sum of 240 draws at random with replacement from

[pick all that are correct]
red, red, blue, blue, green, green
red, red, blue, blue, 0, 0
1, 0, 0, 0, 0, 0
1, 1, 0, 0, 0, 0
1, 0, 0 0, 1, 0
1, -1, 0, 0, 0, 0
1, 1, -1, -1, 0, 0
1, -1, 0
...................................
Find E(D)
..................................
Find SE(D)

Please help

Answer 1

A)
1, 1, 0, 0, 0, 0

B)
1, -1, 0

Answer 2

These are wrong

Answer 3

Cheater beware.

Answer 4

A)red, red, blue, blue, green, green
1, 1, 0, 0, 0, 0
1, 1, -1, -1, 0, 0
B)red, red, blue, blue, green, green
red, red, blue, blue, 0, 0
1, 1, -1, -1, 0, 0
C)0
D)7.303

Answer 5

john
c=0 ok
rest wrong

Answer 6

laughing

Answer 7

A)
1, 1, 0, 0, 0, 0
1, 0, 0
0, 1, 0
B)
1, 1, -1, -1, 0, 0
1, -1, 0
C)
0

Answer 8

and D is 7.303?

Answer 9

7.303 is true

Answer 10

d 7.303 is wrong

Answer 11

7.303 is wrong

Answer 12

SE(D) = 0.8165?

Answer 13

SE(D) = 0.8165 is wrong!!!!

Answer 14

Din123

Do you know the answer????

Answer 15

It's right

Answer 16

0.8785

Answer 17

0.8785 is wrong!!

Answer 18

So. You have cheated your way to a meaningless scrap of paper. Well done! I've discovered a fun way to spend my day. Posting wrong answers. You have to decide which are right and which are wrong. Good luck with that!

Answer 19

I didn't answer 0.8785, It was another person. It's ridiculous for people to be putting false answers here.

Answer 20

Even more ridiculous that you are asking for answers for a test.

Answer 21

And even more ridiculous is if u is against to all here, how dare you talk about something because you're here too.

Answer 22

Difference being, I've finished. Without help. Unlike you.

Answer 23

OMG!! Have you finished your test?? And are you spending your Sunday here?? You're a loser!! I'm sorry for you because you must be so lonely!!!

Answer 24

Sunday? It's Monday.

Answer 25

Can somebody put right answer for this?????

Answer 26

No

Answer 27

its okay.!

Answer 28

Too many kids here not being helpful at all and just mocking people, get a life.
I don't know what this is for so I won't give answers exactly:

You can't add up "red" + "red" in any meaningful way so those options fall out, the other ones should be straight forward, is there a difference between 2 in 6 or 1 in 3?

For E(D) just calculate E(D) = E(R)- E(B), how often do you expect red and blue to come out in 240 draws?

For SE(D)= SD * sqrt(n) which will be 12.X
Again you can use any of the dies e.g. 1,1,-1,-1,0,0 = 1,-1,0 to calculate the SD for the die

Answer 29

Thank you so much.!

Answer 30

thanks a lot

Answer 31

Yeah. Thanks. Serious question. Why are you people doing a mooc, when you come here to get all the answers? Every question from weekly assessments, midterm, final - they are all here. Why? I'm just waiting for someone to try and claim credit for a mooc at my university. The laughter will be heard across the oceans. LOL.

Answer 32

This test was so easy. The fact you had to ask for help speaks volumes.

Answer 33

finally Din, which is the right answer?

Answer 34

Idiocracy. It's not a movie.

Answer 35

well i guess you cannot stop cheating only but one should not ignore those who are studying hard with just one aim to learn so its ok this world is full of cheaters or copycats no originality no creativity but you should also keep in mind that still there are some good learners as well

Answer 36

can any one tell me the ans of D plz ???

Answer 37

OK, I will help you for last time. The correct answer is 12.5875

Answer 38

its wrong :(

Answer 39

D)The statistical standard deviation Sigma is the square root of the variance; the variance is described as the average difference from the mean.
How far is each data point from the mean?
1-0=1
1-0=1
-1-0=-1
-1-0=-1
0-0=0
0-0=0

(1^2+1^2+(-1)^2+(-1)^2+0^2+0^2)/6=4/6=2/3
sqrt(2/3)=0.816496580927726
so SD(D)=0.816496580927726
SE=SD*sqrt240=0.816496580927726*15.49193338
=12.64911064

Comments:
0.8165 written above ( in the answers)was SD not SE.

Answer 40

there are 3 reasons for which you do not understand this easy statistic issue:
-teacher did not explained you well enough( which I doubt)
-you are not attentive(which is most likely)
-you are not accurate or you jump directly on seeking answers,without a complete judgement of the problem(100% true, since you are looking for help).

Hope you will learn something after this post.

@seriously- get a life man,what is the meaning of posting wrong answers?

Answer 41

Why? If you undertake a course to gain a certificate - that involves assessment of your knowledge, then getting someone else to answer the questions for you is doing a disservice to everyone doing the course. Can't stop the cheating. But I can have fun playing with heads.

Answer 42

You can't do nothing about stop them cheating , but you have fun leading them in the wrong direction?

This makes you feel better than them?
:))))...don't you feel it's something wrong?

Answer 43

No. they agreed to an honor code. They agreed not to do what they are doing. Buyer beware.

Answer 44

l13
is right
thanks
dr dave

Answer 45

I just wonder how sad your life must be to take enjoyment out of telling wrong answers in an internet forum, posting under multiple names just to screw with people.

Nobody likes others cheating but most people have a life so they don't get worked up over it to such an extend, maybe you should look into that at some point, "Seriously".

Answer 46

C=0 is right
D=12.6490 is right

Answer 47

was trying to follow the conversation, but the truth is that I cannot understand some mental illnesses of two or three of you. if you are really following the honor code, what do you do in these pages? This only reflects that there is something wrong in you. If it really mattered you , just knowing that you did it for yourself you should feel pride but try to make others life miserable only say that you still feel miserable. Do you always follow the honor code? Never cheated your husband / wife? Never have you deceived your boss? Never told a lie? If you answered no to all of the above, (that doubt it) I think that then what is missing in you is a blow to your pride with a little humility. I think that life has treated you hard because you can't take advantage of what is around. You are a ciber-bully! Shame on you! Looking for help, that is not right.

Answer 48

I'll find and 4.u

Answer 49

a)1, 1, 0, 0, 0, 0
1, 0, 0
b)1, 1, -1, -1, 0, 0
1, -1, 0
c)0
d)12.6490