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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: 30,221
09-30-2005, 09:44 AM
1. ### 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: 4,533
10-16-2008, 01:06 PM
2. ### 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: 2,877
10-18-2008, 01:11 AM
3. ### 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: 2,960
10-18-2008, 09:05 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: 2,041
10-18-2008, 09:07 AM
5. ### 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: 3,120
10-18-2008, 10:00 AM
6. ### 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: 2,510
10-18-2008, 12:50 PM
7. ### 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: 3,082
10-18-2008, 06:54 PM
8. ### 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: 1,601
10-19-2008, 07:26 AM
9. ### 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: 2,195
10-19-2008, 12:21 PM
10. ### 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: 4,077
10-19-2008, 01:02 PM
11. ### 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: 2,356
10-19-2008, 04:49 PM
12. ### 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: 3,566
10-19-2008, 10:25 PM
13. ### 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: 2,842
10-20-2008, 11:10 AM
14. ### 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: 1,931
10-20-2008, 11:45 AM
15. ### 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: 2,843
10-20-2008, 01:26 PM
16. ### 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: 2,119
10-20-2008, 01:51 PM
17. ### 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: 2,919
10-22-2008, 02:59 AM
18. ### 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: 8,228
10-22-2008, 07:05 AM
19. ### 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: 2,829
10-23-2008, 09:44 AM
20. ### 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: 4,906
10-23-2008, 10:01 AM
21. ### 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: 4,097
10-23-2008, 10:27 AM
22. ### 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: 2,979
10-23-2008, 11:57 AM
23. ### 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: 3,234
10-24-2008, 12:56 AM
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: 2,121
10-24-2008, 02:28 AM
25. ### 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: 2,475
10-24-2008, 12:53 PM
26. ### 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: 3,260
10-24-2008, 01:25 PM
27. ### 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: 6,807
10-24-2008, 07:17 PM
28. ### 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: 1,929
10-25-2008, 01:46 PM
29. ### 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: 1,900
10-25-2008, 03:27 PM
30. ### 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: 2,574
10-26-2008, 10:43 AM
31. ### 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: 2,258
10-26-2008, 01:41 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: 2,252
10-26-2008, 02:37 PM
33. ### 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: 2,438
10-26-2008, 05:29 PM
34. ### 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: 1,789
10-26-2008, 06:34 PM
35. ### 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: 4,785
10-26-2008, 10:04 PM
36. ### 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: 4,914
10-27-2008, 01:18 PM
37. ### 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: 4,221
10-27-2008, 06:14 PM

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: 6,470
10-28-2008, 03:06 AM
39. ### 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: 3,079
10-28-2008, 08:47 AM
40. ### 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: 2,516
kgs
10-28-2008, 01:12 PM
41. ### Need help on something easy:(

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

• Replies: 0
• Views: 2,491
10-28-2008, 01:47 PM
42. ### 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: 7,641
10-28-2008, 04:23 PM
43. ### 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: 6,649
10-28-2008, 04:41 PM
44. ### 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: 2,586
10-28-2008, 05:44 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: 2,866
10-28-2008, 06:14 PM
46. ### 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
47. ### 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: 3,367
10-28-2008, 11:33 PM
48. ### Tough probability question...

We are supposing that the proportion of all adults who think that two children is ideal is p = 0.49. What is the probability that a sample proportion...

• Replies: 2
• Views: 2,508
10-29-2008, 01:14 PM
49. ### Selecting K numbers from N=10^L where group of same prefix exists

Hello all, I cannot solve following problem. Lets have a phone numbers of the length L. Number of phone numbers is N=10^L. What is the...

• Replies: 5
• Views: 2,756
10-30-2008, 01:04 PM
50. ### Not a problem, but an opinion about a book

I am currently taking a class called Probability/Math Statistics I. We are using a book called Probability and Statistics with Applications. It is...

• Replies: 4
• Views: 2,095
11-01-2008, 10:39 AM
51. ### Weird Probability Problem

Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

• Replies: 5
• Views: 6,401
11-01-2008, 03:49 PM
52. ### Is this 2 sided or a 1 sided test

Hello everyone! I am new to Hyposthesis Testing. Suppose my H_0 ( Null Hypothesis ) is : mu =1 I understand that H_1 : mu >1 or H_1 mu<1 are...

• Replies: 2
• Views: 4,017
11-01-2008, 11:44 PM
53. ### goodness of fit , 1 sided or 2 sided?

Hello everyone, I am reading about " accuracy " of the Chi squared test. Now we have the following : - P( X=i ) = 1/6 for all i = 1(1)n ...

• Replies: 1
• Views: 3,447
11-02-2008, 11:24 AM
54. ### probability of a machine failure at a certain hour of the day

Hello folks. I look after some servers at work, one of which is intermittently failing. In the 38 days since I set up monitoring, there have been ten...

• Replies: 2
• Views: 4,603
11-02-2008, 12:49 PM
55. ### The sign of COV( f(x,y) , g(x,y) )

I am a PhD student in Economics, I am reading a paper on statistics, and the author states the following proposition without proof. My question is is...

• Replies: 19
• Views: 9,285
11-02-2008, 03:56 PM
56. ### Derivative help

I am having a problem completing a problem because of derivatives. I complete the work down to the part where I get lnL(theta) =nln(theta)- sum...

• Replies: 7
• Views: 2,682
11-02-2008, 03:59 PM
57. ### Reliability of a system with parallel components

Hi, Consider this q.: If all 3 components in a parallel system function independently of one another, and the reliability at time t of the ith...

• Replies: 2
• Views: 6,052
11-03-2008, 03:02 AM
58. ### generalized gamma distribution random numbers

Hi there, Does anyone know how to generate random numbers from the generalized gamma distribution?? If you want to check the density take a look...

• Replies: 1
• Views: 4,436
11-03-2008, 07:38 AM

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