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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: 30,203
09-30-2005, 09:44 AM
1. ### Need to see if i did this correctly... simple question

What kinds of web sites do males aged 18 to 34 visit most often? Pronogarphic sites take first place, but about 50% of male internet users in this...

• Replies: 1
• Views: 3,366
10-28-2008, 11:33 PM
2. ### Exponential pdf

Hello all- Can anyone help on the meaning of the exponential distribution? The derivation I am looking at shows the cdf F(w) = P(W<=w) = 1 -...

• Replies: 1
• Views: 3,177
10-28-2008, 11:29 PM

I) Suppose X ~ U(-1,1). Find the density of Y = X^2. My prof additionally instructed that in this question he wants us to compute the cdf first, and...

• Replies: 0
• Views: 2,855
10-28-2008, 06:14 PM
4. ### Need some help on a probabilty problem due tonight!

I made it through all my homework pretty easily but two problems in general are bugging me. Here they are. If anyone is able to help me I'de...

• Replies: 1
• Views: 2,583
10-28-2008, 05:44 PM
5. ### probability homework

Hello, I am having difficulty figuring out my homework. I made attempts and could someone check my answers and see if I'm right or make suggestions?...

• Replies: 17
• Views: 6,630
10-28-2008, 04:41 PM
6. ### probability question

Hello, I am having trouble with my stat homework. Maybe someone can give me some guidance? I would really appreciate it! A woman is fishing for...

• Replies: 17
• Views: 7,630
10-28-2008, 04:23 PM
7. ### Need help on something easy:(

Nevermind, figured it out..... wont let me delete thread for some reason. Thanks anyways...

• Replies: 0
• Views: 2,485
10-28-2008, 01:47 PM
8. ### Probability Distribution

Hello: A novice statistician here. Hopefully someone can help me with what I expect is an easy question. I'm trying to create a probability...

• Replies: 4
• Views: 2,513
kgs
10-28-2008, 01:12 PM
9. ### a defective probability problem

I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

• Replies: 5
• Views: 3,073
10-28-2008, 08:47 AM

I can't figure these 2 problems out. I'm not very good at stats, so they might be easy. Please answer, even if you only know one of them or part of...

• Replies: 10
• Views: 6,438
10-28-2008, 03:06 AM
11. ### university probability problems, help much appreciated.

Hi guys, I am really struggling with my university statistics work. Probablity has been really difficult. I have asked my tutors for help, but...

• Replies: 1
• Views: 4,219
10-27-2008, 06:14 PM
12. ### How to apply a distribution and derive a failure rate?

please excuse me for my newbie question. certain factors influence the power requirements for my system which comprises of several components. i...

• Replies: 4
• Views: 4,895
10-27-2008, 01:18 PM
13. ### A Drunkard's Random Walk

Here's a homework problem that I need a hint to get started. D drunkard is taking a random walk. he canstep north or shouth with probability .5...

• Replies: 3
• Views: 4,777
10-26-2008, 10:04 PM
14. ### probability

The ones in red are the ones i have confused. would they be conditional probability therefore would the equation be P (A/B) = P (A and B)/P...

• Replies: 1
• Views: 1,787
10-26-2008, 06:34 PM
15. ### Uniform Variable

Can someone please help with the below problem? Derive the probability density function of X=U^2, where U is uniform on (0,1) Where do I even...

• Replies: 1
• Views: 2,434
10-26-2008, 05:29 PM

Im looking back over an old assignment and I cant figure out how to get the correct probability Question: what is the probability of encountering...

• Replies: 3
• Views: 2,250
10-26-2008, 02:37 PM
17. ### transformation of distributions

Here is a question: Consider a uniform variable U on (0,1) and define the variable X=e^u. Find the distribution of X. Here is the work I've...

• Replies: 6
• Views: 2,255
10-26-2008, 01:41 PM
18. ### one or two tailed?

Ok, so i know when testing to determine if say a drug umproves some fuction, the null and alternate hypothesis would not be two tailed. But, if im...

• Replies: 1
• Views: 2,568
10-26-2008, 10:43 AM
19. ### I am stuck on this one

It was reported in a medical journal that about 70% of the individuals needinf a kidney transplant find a suitable donor when they turn to registries...

• Replies: 1
• Views: 1,897
10-25-2008, 03:27 PM
20. ### Question

A computer program produces a random integer between 0 and 9 (inclusive). Find the Probability that the integer is a number at least a 3. I got the...

• Replies: 1
• Views: 1,926
10-25-2008, 01:46 PM
21. ### probability question im having trouble with

1. A system contains 2 identical pumps 1 and 2, if one pump fails the system will still operate however because of the added strain the other pump is...

• Replies: 1
• Views: 6,802
10-24-2008, 07:17 PM
22. ### simple probability question

Hi there, Suppose X~Exp(m) and Y~Bernoulli with P(Y=1|X=x)=exp(b0+b1*x)/(1+exp(b0+b1*x)). I want to find P(Y=1|X>c) where c is a constant. ...

• Replies: 2
• Views: 3,248
10-24-2008, 01:25 PM
23. ### Need help with a basic probability question...

70&#37; of all Super Food stores decided to advertise in their local newspapers. Of those stores that advertised in their local newspapers, 60% had an...

• Replies: 2
• Views: 2,472
10-24-2008, 12:53 PM
24. ### Matching Numbers from two baskets

Hey guys, I would very much appreciate your help here, as I'm stuck with this problem since a couple of evenings now: I have an interval of...

• Replies: 2
• Views: 2,118
10-24-2008, 02:28 AM
25. ### Standard Normal Transformation

f(x) = 1/sqrt(2pi) exp(-1/2* x^2) Find the Density of Y = |X| P(Y =< y) = P(-y =< x =< y) = integral from (y, -y) of f(x) dx. I'm not sure...

• Replies: 1
• Views: 3,227
10-24-2008, 12:56 AM
26. ### Help with a few probability problems

Im having trouble figuring out follow two problems. I cant seem to get the problems with "or" or "given" in them. Could you'll please explain how to...

• Replies: 1
• Views: 2,974
10-23-2008, 11:57 AM
27. ### Discrete random variable

Here is a problem given : Let X equal the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. Need to...

• Replies: 1
• Views: 4,091
10-23-2008, 10:27 AM
28. ### Bunch of questions (just need help not answers)

Like the title says, I have a bunch of problems that I don't know how to solve. I learn from looking at examples and trying to figure it out (this...

• Replies: 9
• Views: 4,903
10-23-2008, 10:01 AM
29. ### Flipping coin

http://www-stat.stanford.edu/~serban/116/pfin3.pdf How do they derive E(X|H) and E(X|T) in 6(d)? I try Bayes formula but I cant get the same...

• Replies: 1
• Views: 2,818
10-23-2008, 09:44 AM
30. ### probability Homework help please

I have a stats probability problem for homework. It is a chart showing a survey of patients regarding satisfaction with care and type of surgery. ...

• Replies: 2
• Views: 8,195
10-22-2008, 07:05 AM
31. ### Poisson

Suppose that the number of light absorbing molecules or particles along the path of a ray of light entering a body of water is poisson. The...

• Replies: 1
• Views: 2,908
10-22-2008, 02:59 AM
32. ### Standard deviation from three gaussians

2 problems. How does one find a standard deviation from three convoluted gaussians. This has come up in two contexts that I have considered...

• Replies: 1
• Views: 2,114
10-20-2008, 01:51 PM
33. ### probability help greatly needed

Alright I've got a probability test coming up and our professor gaves us a work sheet with 30+ problems to review and these are some I'm having...

• Replies: 1
• Views: 2,840
10-20-2008, 01:26 PM
34. ### Poisson distribution...have you any ideas?

While away from the office for an hour, a lecturer receives an average of six telephone calls. i)What conditions must be satisfied if the number...

• Replies: 1
• Views: 1,928
10-20-2008, 11:45 AM
35. ### Very easy question for you...help

Assume that the rate of return on projects is a random variable having a normal distribution with standard deviation = 0.05 per cent. If a bank...

• Replies: 6
• Views: 2,839
10-20-2008, 11:10 AM
36. ### Binomial Formula ?

Hi everyone, I'm absolutely going crazy trying to figure this problem out, and I know the answer LOL..I just can't figure out how they got it. Using...

• Replies: 12
• Views: 3,561
10-19-2008, 10:25 PM
37. ### Conditional Probability

I am having a very hard time with this one problem, I did a search on the site but came up empty so I'm sorry if this is a repost. Last semester,...

• Replies: 2
• Views: 2,355
10-19-2008, 04:49 PM
38. ### Continuous Random Variance

Assume that x is a binomial random variable with n=1000 and p=0.5 Find the following probabilities: P(x >500) So mu=np=1000x0.5= 500 ...

• Replies: 1
• Views: 4,070
10-19-2008, 01:02 PM
39. ### Moment Generating Functions

This is my first time posting. We just started this and I am completely lost. The problem is to find the mean, variance and the pdf of a random...

• Replies: 1
• Views: 2,193
10-19-2008, 12:21 PM
40. ### true hypothesis and errors??

Ok...so i have a sample problem that asks to describe the circumstances under which a researcher would make a Type I and or Type II error in the...

• Replies: 2
• Views: 1,599
10-19-2008, 07:26 AM
41. ### Binomial Random Variable

A study of gambling activity at the university of west georgia discovered that 60% of the male students wagered on sports the previous year. Consider...

• Replies: 1
• Views: 3,072
10-18-2008, 06:54 PM
42. ### risk

Hi, sorry if may be a stupid question, but I have a such an elementary doubt: let you suppose that a certain distribution (for example triangular:...

• Replies: 4
• Views: 2,506
10-18-2008, 12:50 PM
43. ### Outlier in a small population

Hi, My question is about an outlier in a small population. I was studying the telecommunication sector in Australia. For this example, let us...

• Replies: 3
• Views: 3,119
10-18-2008, 10:00 AM

Hi guys, I have no idea how to solve this problem...can anyone give me some piece of advice. (please..) If the probability density of X is...

• Replies: 1
• Views: 2,040
10-18-2008, 09:07 AM
45. ### Probability..not sure if I am using the correct theory;

I am at my wits end....I have smoked 1000 cigarettes, on the verge of tears and have been up all night trying to determine what formula to use to...

• Replies: 1
• Views: 2,951
10-18-2008, 09:05 AM
46. ### First time taking stats, need some help.. tried on my own still stuck!!

This is my first year taking stats. I have a ton of homework this weekend, I was able to do most of it but I'm stuck on these questions... 1. How...

• Replies: 3
• Views: 2,872
10-18-2008, 01:11 AM
47. ### Probability dealing with sample proportion

I know how to compute the sample mean but I have a problem dealing with sample proportion. The problem is compute the probability that another...

• Replies: 1
• Views: 4,527
10-16-2008, 01:06 PM
48. ### Z-scores for probability in tails

I haven't done any stats in years and now I am in a course for my grad program and I am so lost. My teacher is very confusing and I am trying my best...

• Replies: 3
• Views: 23,901
10-16-2008, 06:45 AM
49. ### Find the value of x

I am having trouble finding the value of x with this problem, because my teacher's example problems are a lot different! The question is A new...

• Replies: 1
• Views: 10,467
10-15-2008, 10:18 PM
50. ### Null and alternate hypothesis

Hi- I have a problem that begins, "Suppose you wish to test the null hypthesis that u=50 vs the alternate hypothesis that u<50...."and then it goes...

• Replies: 1
• Views: 2,851
10-15-2008, 09:49 PM
51. ### probability mass function

You have 4 red jelly beans and 4 green jelly beans in a paper bag. Without looking, you will pick jelly beans, one at a time, from the bag and stop...

• Replies: 0
• Views: 3,185
10-15-2008, 09:45 PM
52. ### Another problem for maximizing profit...

Consider a store owner who buys items one day for \$1.00 and sells them the same day for \$1.50. Assume the item has no value the next day and that...

• Replies: 0
• Views: 2,660
10-15-2008, 04:55 PM
53. ### maximizing profit given pdf

Here is the problem I came across while studying for the test and need some help: A retail grocer has a daily demand, Y for a certain product sold...

• Replies: 2
• Views: 6,665
10-14-2008, 02:16 PM
54. ### Conditional Probabillity- Check my work?

Ok the problem goes like this: A small brewery has two bottling machines A & B. Machine A bottles 75% of all their bottles, and B bottles 25%. One...

• Replies: 7
• Views: 3,020
10-13-2008, 04:49 PM
55. ### Transformations of Random Variables

Suppose X ~ U(-1,2). find the density of X^2 My soln so far: f(x)x = (1/3, -1<x<2. 0 elsewhere) My teacher tells us to find the CDF, then...

• Replies: 4
• Views: 2,801
10-12-2008, 05:06 PM
56. ### Infinite sum

Hi All- It has been a few years since my last calc class and now I am taking a course in mathematical stats. I have the discrete data pmf:...

• Replies: 4
• Views: 3,089
10-12-2008, 02:06 PM
57. ### Type II error

I'm currently doing a statistics assigment. In one of the questions, i've been asked to "discuss" what the probability of a Type II error, what i...

• Replies: 10
• Views: 7,386
10-12-2008, 10:47 AM
58. ### Independent Events Occurring Simultaniously

This should be an easy one for you smart guys: Consider a double computer intruder detection system (IDS) with system A and system B. If there is...

• Replies: 6
• Views: 8,980
10-10-2008, 07:48 AM

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