Question

Help please :c
Daniel needs to study a possible link between anti-inflammatory drugs and kidney disease. Help Daniel design a study that would be appropriate.

Explain the type of study, the sampling method, the parameter of interest, and the statistic he could use to estimate that parameter. What conclusions would Daniel be able to draw from this study?

Answer 1

What I came up with was that he basically needs to do a survey rather than an experiment. It seems more logical due to the fact that what if it really did, then now people get kidney disease due to his experiment.

Answer 2

@Hero

Answer 3

@Preetha @dan815

Answer 4

Any ideas, Dan?

Answer 5

What are the other types of study, and sampling methods

Answer 6

and parameter of interest--->what age groups to pick from and what sex, background body types and stuff

Answer 7

Okay, well to make it more legit the parameter of interest should be random as long as they have kidney disease correct?

Answer 8

It's not like he should stick to 25-30 year old Asians. It should be very open I would imagine.

Answer 9

Yeah I suppose, random sampling method, but parameter of interest maybe an even distribution among the ages, and a random selection in the age groups

Answer 10

To do proper study though

Answer 11

Divide into even age groups, then redivide the age groups by some other characteristic... like weight lets say. And then pick random from this arranged groups

Answer 12

random from each subdivided groups

Answer 13

just random suggestions dont have to follow, im just giving you ideas to organize data.

Answer 14

Okay, I think I can make something up then. But what about the conclusion, am I suppose to just make something up?

Answer 15

So like the way, he arranges groups lets say... by age or something, he can see what type of age groups are more heavily affected if so... then he can conclude age is afactor and account for it, if not, he can conclude there are other factors and look at other arrangement of data

Answer 16

Okay, I think I understand. But is it just me who thinks the question isn't completely logical?

Answer 17

It's a wide question, but its fine I guess.

Answer 18

Different possible answers based on your argument.

Answer 19

Okay. Do you mind helping with another?

Answer 20

I can post it here or in a new question so I can give you another medal.

Answer 21

Two gears are connected and are rotating simultaneously. The smaller gear has a radius of 4 inches, and the larger gear has a radius of 7 inches.

two circles touching at one point. Larger circle has radius of 7 inches. Smaller circle has radius of 4 inches.

Part 1: What is the angle measure, in degrees and rounded to the nearest tenth, through which the larger gear has rotated when the smaller gear has made one complete rotation?

Part 2: How many rotations will the smaller gear make during one complete rotation of the larger gear?

Answer 22

okay

Answer 23

Lets look at circles assume the gear spokes are too small to play a factor

Answer 24

help daniel lol

Answer 25

lets look at 1 full revolution of the small circle, 2*pi*4=8pi, when it has rotated 1 revolution, how much has the big one rotated,

Answer 26

The Big one must have also moved 8pi, however 8pi/(7*2*pi)= 8/14=4/7

Answer 27

You have seen only 4/7 change in rotation

Answer 28

So while the small gear does a full rotation the big gear does 4/7 of a rotation

Answer 29

We can generalize a basic equation now, for and given radius x and radius y for 2 circles,
The angle of rotation change is proportional to x/y for 1 revolution of the change in the circle with radius x

Answer 30

Simply saying... divide the 2 radius to know the change in rotation of the other circle

Answer 31

So I would divide 7 by 2 is what you're saying?

Answer 32

Sorry, math is not my strongest subject.

Answer 33

Part 2)
let x be rotation of small circles
Let y be rotation of big circles
We saw that
y=4x/7
when y = 1
1=4x/7
x=7/4

Answer 34

Also you are not done part 1.. We saw that it was rotation 4/7 th of the smaller circles rotation, so 4/7 * 360 degrees = the rotation in degrees

Answer 35

Well give all that a good read

Answer 36

So 205.7 is the rotations in degrees, correct?

Answer 37

Do not worry about the answer, focus on understand the concept, and how you can solve it yourself.

Answer 38

understanding*

Answer 39

okay.. But I mean either way I have to get the answer.

Answer 40

*flicks hair back*

Answer 41

No rawr the answer is not the goal here.

Answer 42

.-. I'm just going to guess I was right for the first part. So what you said up there about part two I have to keep solving, correct?

Answer 43

Okay.

Answer 44

I am trying to help you. You have to be able to solve them on your own. What about doing this question?
2 gears, radius 2 and 5, can you do the same 2 questions in Part 1 and 2 for these 2 gears

Answer 45

well the rotation fraction of the big circle would be 4/10 right?

Answer 46

yes 2/5 = 4/10

Answer 47

What will be that angle of rotation of the big gear then for 1 full smaller gears rotation

Answer 48

I would take 4/10 and multiply it by 360 right?

Answer 49

yep good.

Answer 50

I typed it into a basic calculator so this may be wrong but I got 1.256

Answer 51

1.256 for what?

Answer 52

Just did it on mathway and got 144.

Answer 53

ok

Answer 54

So for part 1 of your example my answer would be 144.

Answer 55

So now we need to do part 2.