Statistics please?
Check my answers.

Question

yanasidlinskiy · Answer

attachment

yanasidlinskiy · Answer

If they're wrong, I'd like an explanation and a step by step walk through so I could understand it better.

uri · Answer

can i

yanasidlinskiy · Answer

What?

kropot72 · Answer

You need to check your calculation for (a). What was you total for the number of participants in the study?

kropot72 · Answer

your total*

denonakavro · Answer

Your first answer should be the coulmn of died from cancer divided by the total
YOur second answer should be the row of current cigar smoker divided by the total
Your third answer should be 165 (the intersection of the previous) divided by the total
Your last answer should be the addition of the died of cancer column with current smoker column divided by the total

yanasidlinskiy · Answer

Well the total for dying of cancer is 559....

yanasidlinskiy · Answer

Unless, it's the last number to the right of the first column

denonakavro · Answer

The  total is all the values added in the whole table

kropot72 · Answer

The total who died from cancer is: 559 + 50 + 165

yanasidlinskiy · Answer

I know that.

yanasidlinskiy · Answer

For part A, I did: 559/133706
Is that right?

kropot72 · Answer

Total who died from cancer = 774
Total participants = 133706

yanasidlinskiy · Answer

Ok, I see what I did wrong. Is B right?

kropot72 · Answer

$$\large P(died\ from\ cancer)=\frac{774}{133706}$$

yanasidlinskiy · Answer

I know how to solve it, I just didn't know if I did it right.

kropot72 · Answer

There are 165 current cigar smokers. Divide by the total number in the study.

yanasidlinskiy · Answer

For part B?

kropot72 · Answer

$$\large P(current\ cigar\ smoker)=\frac{165}{133706}$$

yanasidlinskiy · Answer

So Part c would come out as the same answer for part B right?

james1107 · Answer

yes

kropot72 · Answer

"So Part c would come out as the same answer for part B right?"

Correct.

yanasidlinskiy · Answer

Ok. So part D would be adding up B AND C right?

anonymous · Answer

No direct answers

yanasidlinskiy · Answer

@M*A*S*H I already know how this stuff. It's not a direct answer.

kropot72 · Answer

For part (c) you need to use:
$$\large P(A\cup B)=P(A)+P(B)-P(A\cap B)$$

anonymous · Answer

I was talking to denon

yanasidlinskiy · Answer

That confuses me. I do not know how to use that formula

kropot72 · Answer

(d) In this case the intersection of the probability of (a) and the probability of (c) is so small that it can be ignored. Therefore you just need to add the probability found for (a) to the probability found for (c).

kropot72 · Answer

What are your results for (a) and for (c) now?

yanasidlinskiy · Answer

Well for A I have:
.005
And for C, I have:
.001

kropot72 · Answer

I agree with your answer for (c). However you appear to have not rounded the calculation for (a) correctly.

kropot72 · Answer

What is the result for (a) on your calculator before rounding?

yanasidlinskiy · Answer

Sorry, .006

kropot72 · Answer

Correct!

kropot72 · Answer

So your result for (d) is.........

yanasidlinskiy · Answer

.007

kropot72 · Answer

Wait, the question, as posted, does not state to round to 3 decimal places for (d). Does the original state this or not?

yanasidlinskiy · Answer

Yes, i accidentally cut it out. But yes. I have to round to 3 decimals as well.

kropot72 · Answer

Cool. Then your result for (d) is correct.

yanasidlinskiy · Answer

Thank you. Could you check one more question for me please?

kropot72 · Answer

You're welcome :).
Sorry, I must log out now. Please post as a new question. Thanks.

yanasidlinskiy · Answer

Ok.