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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 30,322
09-30-2005, 09:44 AM
1. ### okay need insight on this...

I have attempted to work this out twice use 2 different formulas (1.interval estimation of a population mean (small-sample case) 2. interval...

• Replies: 4
• Views: 3,538
08-22-2011, 06:56 AM
2. ### I need Probability help

hey folks! I've been given two probability questions for my home assignment. I've been trying to solve these problems but having difficulty...can...

• Replies: 4
• Views: 3,861
09-17-2011, 04:40 AM
3. ### continuous distributions

hey.. im struck here f(x,y)=8xy 0<y<x<1 so now how do i take the limits to integrate when i have to calculate E(XY)?

• Replies: 4
• Views: 2,867
04-07-2011, 12:15 PM
4. ### Yet another "flipping" coin problem

Hi folks, So we flip two balanced coins. If at least one of them shows tails what is the probability that the other coin is also tails? My answer:...

• Replies: 4
• Views: 3,578
04-12-2011, 08:15 PM
5. ### Question Probability Marbles!!

There are 5 red marbles and 195 blue marbles. Marbles are drawn randomly with replacement. What is the smallest number of draws, (d) for which...

• Replies: 4
• Views: 2,784
04-29-2011, 03:17 PM
6. ### Card guessing problem

I took statistics & probability in college, but, for some reason, I seem to have a mental block on how certain things work. I never know which...

• Replies: 4
• Views: 3,503
05-15-2011, 04:26 AM
7. ### Total Probaililty (both defective)

Problem: I don't have the solution to this problem. I think the approach is to solve it by "total probability". P(DD) = P(I)*P(D | I)...

• Replies: 4
• Views: 2,275
06-26-2011, 05:32 PM
8. ### Can someone confirm if i calculated this properly

In a jar we have: 2 Big White Balls 4 Small White Balls 2 Big Black Balls 2 Small Black Balls Blindfolded we pick 2 balls out the jar.....

• Replies: 4
• Views: 2,162
07-02-2011, 10:56 PM
9. ### exponential distribution: funtional system

Problem: The system is functional if all 3 of its components are in working condition. If lifetime of each components is distributed...

• Replies: 4
• Views: 4,277
07-09-2011, 12:08 PM
10. ### Throwing a die 7 times

Hello, my problem is as follows: Throw a die 7 times. i) What is the probability that you get number 6 twice and all other numbers...

• Replies: 4
• Views: 2,635
07-10-2011, 06:19 AM
11. ### Probability Question

Health public researcher checked data from a group of 937 men that died in 2009. The researcher found that 210 of the men died from heart related...

• Replies: 4
• Views: 2,577
07-22-2011, 02:39 PM
12. ### My answers to a revision paper

Hi, I was wondering if I could get some of these answers checked for me. The paper I am working from is here and I am attempting section A...

• Replies: 4
• Views: 3,670
07-25-2011, 11:25 AM
13. ### Kind of unusual problem...

So this may seem sort of silly but was hoping I could get some help. I am not a very mathematical person but it has interested me a lot recently so...

• Replies: 4
• Views: 1,840
08-08-2011, 05:51 PM
14. ### Assignment Problem ((urgent))

Hey all. I am having some difficulty with one question on an assignment I have been workiing on. I am quite new to stats and I cannot find a...

• Replies: 4
• Views: 2,460
08-21-2011, 01:34 AM
15. ### drawing more than one marble at random

Hi, Can you please check my solutions? I guess, I have got them right.Thanks Probability 1) If four marbles are drawn at random from a bag that...

• Replies: 4
• Views: 4,840
08-22-2011, 08:30 AM
16. ### Probability Density function table

given the pdf table for function pxy(x,y) for 2 discrete random variables X and Y which take values 0,1. What do E and Cov(X,Y) equal and what is the...

• Replies: 4
• Views: 4,337
08-24-2011, 09:45 AM
17. ### Probabilities: "Drunk is 10 steps away form falling in the dock"

A drunk is 10 steps away from falling in the dock. Every step he takes is either directly towards or away from the dock and he is equally likely to...

• Replies: 4
• Views: 3,221
09-14-2011, 12:28 PM
18. ### really urgent probability problem - is it bayesian?

Hi, I have an urgent problem but I'm a little lost. Is this probability question referring to the use of Bayes' theorem? Firstly, I don't...

• Replies: 4
• Views: 2,830
BGM
09-14-2011, 08:48 AM

:shakehead The class had calculated that 80% of Statistics and Modelling lessons, are interrupted by one or more notices. Find a) the average...

• Replies: 4
• Views: 3,090
09-20-2011, 02:19 AM
20. ### Stuck on a (trivial) derivation for mixed effects linear models...

i know this is horribly basic, but for some reason i'm not on top of my game now and cant work something very easy out. the general...

• Replies: 4
• Views: 2,737
09-26-2011, 09:44 AM
21. ### Multinomial Distribution shortcut?

I'm wondering is there any kind of shortcut with the Multinomial Distribution. Suppose i have 6 balls:{3R,2B,1G} and i make 3 draws (with...

• Replies: 4
• Views: 3,320
10-17-2011, 03:05 PM
22. ### Basic Probability Homework

We just stated to have about probability at the ongoing course. We have this Exercise which I, apparently, cannot figure out how to calculate. "...

• Replies: 4
• Views: 3,288
10-10-2011, 08:13 AM
23. ### probability given p=.10

Question: A manufacturer of power meters, which are used to regulate energy thresholds of a data-communications system, claims that when its...

• Replies: 4
• Views: 3,361
10-14-2011, 05:30 AM
24. ### Question. Non parametric analysis in SAS

I have a question perhaps someone can easily answer. I used a random block design and couldn't get normal distribution on the data. I then switched...

• Replies: 4
• Views: 3,148
10-16-2011, 09:56 PM
25. ### marginal and conditional density and probability

Dear all, I really need your help in solving these questions. If X is the amount of money (in dollars) that a salesperson spends on gasoline and...

• Replies: 4
• Views: 3,870
10-29-2011, 03:23 PM
26. ### Hypergeometric Random Variable help!

Here's the question, I've tried all the formulas given to me in the chapter, and none are working. I'm guessing to use the mean and...

• Replies: 4
• Views: 5,937
10-24-2011, 03:01 PM
27. ### Wheel of lucky problem

Dear everyone, Here is the problem I tried by defining the functions S(a) and C(a), where S(a) denotes the probability of player A winning if...

• Replies: 4
• Views: 2,247
10-26-2011, 11:23 AM
28. ### Sampling and Estimation (From STPM)

A random sample X1,X2,X3,...,Xn is taken from a normal population with mean "u" and variance 1. Determine the smallest sample size which is required...

• Replies: 4
• Views: 3,549
BGM
10-25-2011, 11:49 PM
29. ### Sandbagger

What is the probability of a golfer winning 3 out of 4 golf tournaments? 5 out of 7? 40 players in each tournament, players have USGA handicaps.

• Replies: 4
• Views: 2,205
11-01-2011, 09:45 PM
30. ### Exponential Family

Hi! I'm trying to demonstrate that the following distribution is a member of the exponential family. Theta * x^(Theta-1) * exp (-x^Theta) ...

• Replies: 4
• Views: 4,325
11-04-2011, 08:29 AM
31. ### Distributive Law P[A u (B n C)]

I am trying to find a synonymous formula formula for: P = P Can anybody help me? I found somewhere that said it was equal to P but I...

• Replies: 4
• Views: 15,762
11-05-2011, 04:07 PM
32. ### Consistent Estimator

I'm new here so i'm not sure what is wrong with my tex (i cant get +)so I will write the correct information under my tex lines A balanced one way...

• Replies: 4
• Views: 6,245
alf
11-09-2011, 11:41 AM
33. ### joint distribution of f(x,y)

joint distribution f(x,y) = (1/4)xy if 0<x<2, 0<y<2 = 0 otherwise how to find P(XY<2)? I wrote it out as ∫(from 2...

• Replies: 4
• Views: 3,055
11-15-2011, 02:21 AM
34. ### please i need help with my HW

hello i have question in my home work that i was tried to solve it but unfortunate i can't the question: Harrison Water Sports has three...

• Replies: 4
• Views: 4,931
11-19-2011, 02:37 PM
35. ### Weighted multivariate hypergeometric distribution?

Hi, I'm writing a simulation where part of it can be done using the following steps: 1. Choose 1 element from with probability without...

• Replies: 4
• Views: 3,214
11-28-2011, 07:05 PM
36. ### help for task in R programming language

This is my task. I don't know how to solve it in R studio. Please help me!!! Simulate: a) 15 values from N(0,1) distribution b) 50 values from...

• Replies: 4
• Views: 2,921
11-28-2011, 12:35 PM
37. ### Poisson test help!

Hi! I am sitting with a school assignment, but I got stuck on this one. I am suppose to test if my data is Poisson-distributed. The data has a...

• Replies: 4
• Views: 2,405
12-03-2011, 08:33 AM
38. ### Simple Prob. Question / problem

Hey, Im new to the forum and have loved reading and lurking over the past few weeks. I have a question my friends and I constatnly argue over and...

• Replies: 4
• Views: 1,740
12-01-2011, 04:26 PM
39. ### statistical decision making

:wave: Is it possible to know if whether an error in statistical decision making has been committed in a single study?

• Replies: 4
• Views: 2,523
12-02-2011, 01:41 PM
40. ### Bowl with marbles

Hi there, I have difficulties in resolving this problem: In a bowl we have 5 white marbles and 15 black marbles. What is the probability of...

• Replies: 4
• Views: 2,381
12-02-2011, 03:46 PM
41. ### Probability Density Function

Hello guys I just want my work to be reviewed on this exercise please :) Consider X a random variable with pdf f X (x) = (3/8) * (1-x)^2 if...

• Replies: 4
• Views: 2,662
BGM
12-05-2011, 11:04 AM
42. ### distribution help

I am just completely failed my online test and my teacher is letting me retake this 20 point question to try and pass...if anybody can help me out I...

• Replies: 4
• Views: 1,809
BGM
12-10-2011, 03:28 PM
43. ### Distribution of xy/z

Hi can someone please help me find the distribution for xy/z where x,y,z are uniform from 0 to 1 and independent. Having trouble with my set up...

• Replies: 4
• Views: 4,319
BGM
01-03-2012, 03:42 AM
44. ### Help! I’m baffled with a probability problem…..

Hi, Newby here. I am hoping someone on here can assist with a probability question that’s troubling me. I have three ‘events’, in each event...

• Replies: 4
• Views: 65,093
01-09-2012, 11:39 AM
45. ### Probability Density Function of normal distribution

I have a question: Please give the probability density function of a normal distribution trun- cated to . Can anyone pls help me to solve this...

• Replies: 4
• Views: 3,329
01-20-2012, 10:21 PM

Hey Evry1..... I have been facing a problem in achieving the solution for the following question in quite some time. Kindly help me with the...

• Replies: 4
• Views: 2,096
01-27-2012, 11:57 PM
47. ### Blood Groups - I think this is right?

46% of people have blood type O, 42% have type A, 9% have type B and 3% have AB. Among 4 potential donors, what is the probability that: A) all are...

• Replies: 4
• Views: 1,717
01-28-2012, 03:37 AM
48. ### Independent events?

I don't know how to do this question...how to find if one event is independent of another. I answered the following question: After surveying...

• Replies: 4
• Views: 3,839
01-28-2012, 02:50 PM
49. ### Probability distribution function for extracting b balls out of a urn.

Hello everybody, First of all I would like to say that I am not a student trying to get his homework solved. Rather I am a software developer...

• Replies: 4
• Views: 3,894
02-14-2012, 10:09 AM
50. ### EX and var(X)

I need some help with this conceptually. Find EX and var(X) for a random variable with pdf f(x)= 1/2e^(-|x|) Is this correct? {\it...

• Replies: 4
• Views: 3,388
02-06-2012, 11:18 PM
51. ### project help

This seems really simple to me but I'm not sure how to go about it since I haven't taken stats in 4 years... population = 150 a certain response =...

• Replies: 4
• Views: 2,019
02-06-2012, 11:44 PM
52. ### Calculate Prob's using multiple means and std dev's

Hi all. My first post. I'm trying to find a correct methodology for a problem and am a bit stumped as I don't really know how to frame it in a...

• Replies: 4
• Views: 2,577
02-15-2012, 09:03 AM
53. ### Question - Having a hard time figuring this out

USA Today reported that "high-volume" hospitals performed 77% of bladder removal surgeries, and the rest were performed in "low-volume" hospitals....

• Replies: 4
• Views: 2,139
02-15-2012, 03:41 AM
54. ### Variances and comparison of biased and unbiased estimators.

If was shown that if: S'^2= (summation(Yi-Ybar)^2)/n and S^2= (summation(Yi-Ybar)^2)/(n-1) then S'^2 is a biased estimator of sigma, but...

• Replies: 4
• Views: 2,833
02-21-2012, 06:40 PM
55. ### need help in probability problem

Hi all, I'm practicing some probability problems and I got a homework couldn't understand a problem in here The problem is: Anew digital scale...

• Replies: 4
• Views: 1,926
02-26-2012, 02:35 PM
56. ### The Mean and Std. Deviation of a probability distribution

Q: Select a bill from a box that contains 3 $1 bills, 2$5 bills, 2 $10 bills, 3$20 bills. a) Construct a probability distribution b) Find the...

• Replies: 4
• Views: 3,324
02-29-2012, 04:53 PM

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