Question

This is a really easy question, please! The first one to explain it to me and give me the right answer gets a medal. PLEASE HELP SOON!!
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Samuel is researching the favorite foods of the students in his grade. He surveys the students in his science class. Which of the following is not true?

Answer 1

Here is the question.

Answer 2

Did it specify he used stratified sampling?

Answer 3

He didn't use stratified sampling. To use a stratified sample, you would take, for example, one student from each class in the grade and give them the survey.

Answer 4

A significant fact.

Answer 5

lol thanks I got it... but now I have a new question ad;lfjadslkjfa;sdlfj @douglaswinslowcooper @applemuffin95

Answer 6

Where's your Q?

Answer 7

Here.
@douglaswinslowcooper

Answer 8

@douglaswinslowcooper The one that is blue and bubbled in is the one I think. I think that's a spinner because their spinners have like, 10 things on it. But a deck of cards have 4 suits. A die has 6 sides. Slips of paper? lol

Answer 9

You want simulations that easily work with probability of 1 chance in 4. For example, the deck of cards could have each suit correspond to a gumball flavor. Two of the other three could be made to work. the third would be awkward. Do you see which one?

Answer 10

The spinner? @douglaswinslowcooper

Answer 11

Spinner could have 4, 8, 12, 16 locations, and so might work. Lots of slips of paper could be used, with a fourth of them the target flavor. How would a die or dice work?

Answer 12

Spinner, perhaps. Die, certainly.

Answer 13

OOOhhhh so the answer is a die... @douglaswinslowcooper lol now there is a graph I need help with omg seriously I did all the essays and stuff on my own, and it's 11:16. Can you help too?

Answer 14

I'm hooked. I'll try.

Answer 15

haha omg thank you so much. here it is, I'm working on it. you can help too. @douglaswinslowcooper

Answer 16

@douglaswinslowcooper

Answer 17

lol I was good with everything else in the module. The only thing that I couldn't do was probability... This part of the test is about probability. ( / )_( \ ) @douglaswinslowcooper

Answer 18

lol there is another matching thing after this... I think only 1 though. :) I answered like, 3 questions. whoop whoop @douglaswinslowcooper

Answer 19

noooo omg where did you goooooo I need your help like, really bad. O.O @douglaswinslowcooper

Answer 20

Fine. We have D M F S, as Darnell, Mother, Father, Sister

Without replacement means there are three choices left after the first pick.
With replacement means there are four choices again.
Note that "parent" means either M or F, an added complication.

P(D and S), with replacement
First pick: could get D or S out of the group of four, so p1=2/4
Second pick, must get the other one (D if have S. S if have D), so p2=1/4
Joint probability: p1*p2 = 2/16 = 1/8 = .125

My problem is that none of your choices include 1/8, so I'm off or they are.
I'll try another.

Answer 21

if it is soooo simple....

Answer 22

P(M and F, without replacement):
First pick, p1=2/4 as either M or F ok
Second pick, p2=1/3, as three are left, one either M or F not gotten before.
Joint probability = p1*p2 = 1/12 , one of your choices

Answer 23

P(parent and sister, without replacement
1st pick M or F: p1 = 1/2
2nd pick, have one parent, D, S left, thus p2 = 1/3
Joint p1*p2= 1/6

Answer 24

P(parent and child, with replacement):

1st pick M or F out of four: p1 = 2/4
2nd pick D or S out of four: p2 = 2/4

joint = p1*p2 = 4/16 = 1/4

Answer 25

omg thank you so much, you don't know how much this means. @douglaswinslowcooper

Answer 26

okay, ummm... I think I only have one more question... lemme check. @douglaswinslowcooper

Answer 27

uhh I have one more graph... that's it I think. @douglaswinslowcooper

Answer 28

are you up to it? @douglaswinslowcooper