Question

According to the simulations, what is the probability that the treatment group's mean is greater than the control group's mean by 12 baskets or more, and what can be concluded regarding this result? Assume a probability of less than 5% is significant.
Whole question here: http://imgur.com/a/Q3jH5

Answer 1

12 men and 50
percent?

Answer 2

really dont understand this problem

Answer 3

First you have to work out the mean, by adding up all the values and dividing by how many there are.

To do that, multiply the value in the left table, by the frequency on the right, for all of them.

Eg.
(-14)*7 + (-12)*18 + (-10)*20 + ... and so on

Then, divide that result, by the sum of all the values in the frequency column

Answer 4

ok

Answer 5

got 32/1000

Answer 6

That doesn't look right at all.

Answer 7

got 32 on the left side and 1000 on the right side

Answer 8

That isn't what I suggested. Go back and re-read it.

Answer 9

i multiplied them by the right side and got 32 then added the frequency side and got 1000 if i divide them i get .032

Answer 10

I would help but I have the same thing you did

Answer 11

what answer are u getting

Answer 12

Actually no yours looks right. Now we gotta try to figure out the probability

Answer 13

this whole lesson doesnt make sense

Answer 14

It does, I'm just trying to remember how to get the z-score from a table like this. I think we just need to get the standard deviation, then we can use the z-score formula, but getting std dev is tedious.

Answer 15

Yeah i think you need to find the std dev https://puserscontentstorage.blob.core.windows.net/userimages/a3c3271c-61c8-4991-b5c8-5fdb4777e651/8abbec95-babd-4c2a-9943-21b81dc7f399image17.png

Std dev is each score minus the mean, squared.

You could do it like so (the number out front is the frequency)

\[\large 7(-14-0.32)^2 + 18(-12-0.32)^2 + 20(-10-0.32)^2 + ...\]

Then you can work out the z-score and the probability from that.

Answer 16

almost done with this course but these last 4 assignments have me confused

Answer 17

\[\large 7(-14-0.32)^2 + 18(-12-0.32)^2 + 20(-10-0.32)^2 + ... \]Don't forget to then divide by 1000, and then square root it, to get std dev.

Answer 18

isnt 0.032

Answer 19

Sure, whatever it was.

Answer 20

I hate questions like this, they're so tedious to calculate everything.

Answer 21

28718.976/1000

Answer 22

Square root it.

Then find the z score with the formula i gave \[\Large z = \frac{ 12 - 0 }{ \sqrt \frac{ 28718.976 }{ 1000 } }\]Then use a z-table to find the probability

Answer 23

z-table?

Answer 24

Yes, you should be familiar with those...

Answer 25

searched it up seen it before

Answer 26

z-score looks like 2.24, but that gives a probability of 1.25%... which doesn't match any answer. Great...

Answer 27

this problem has me tired

Answer 28

im lost ...

Answer 29

do u need the same problem

Answer 30

yea

Answer 31

for what

Answer 32

algerbra 1

Answer 33

all the problems i need are so hard

Answer 34

I got the other ones I just need this one

Answer 35

@Louis I'd probably go with A, just because it's the closest option. I worked out the mean and standard deviation, and got the same values as you.

Answer 36

by any chance can u see if u have better luck with this problem
http://imgur.com/a/GGQAP

Answer 37

I cant get the question pulled up

Answer 38

That one is easier
high score is 38, low is -24
\[\large SD = \frac{ 38-(-24) }{ 6 }\]then plug it into\[\large ME = \pm 2 * \frac{ SD }{ \sqrt { N}}\]N is the number of blue dots on the graph, which i don't feel like counting (i think it's 100, since they said the data was rerandomized 100 times)