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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: 30,213
09-30-2005, 09:44 AM
1. ### HW help

I have a probelm with one of my hw questions which is: A sample from a normal population has a standard deviation of 0.02. What is the...

• Replies: 0
• Views: 2,703
10-09-2008, 02:28 PM
2. ### STA2023 Test question help

9% of men, and 25% of women cannot distinguish between the colors red and green. THis is the type of color blindness that causes problems with...

• Replies: 2
• Views: 2,024
10-09-2008, 12:55 PM
3. ### Conditional Probability question

okay the problem statement is as follows A gene can be either type A or type B (ie note type A). A gene can also be either dominant or regressive....

• Replies: 3
• Views: 2,508
DAV
10-09-2008, 11:21 AM
4. ### Even Sum Problem

How many subsets of three different integers between 1 and 90 inclusive are there whose sum is an even number?

• Replies: 7
• Views: 3,373
10-09-2008, 08:27 AM
5. ### Help - Bayes theorem question.

The sensitivity of a screening test is .95 and its specificity is .85. The rate of the disease for which the test is used is .002. What is the...

• Replies: 3
• Views: 3,287
DAV
10-08-2008, 09:27 PM
6. ### Cossing Toins-Probability

If I toss 10 coins, how do I find the probability that 8 of them will land on heads? Could someone help me out?

• Replies: 11
• Views: 2,976
10-08-2008, 10:14 AM
7. ### Fitting joint distribution to empirical data

I have a dataset of two correlated poisson variables X1 ~ Poisson(my1) X2 ~ Poisson(my2) Pr(X1,X2)<>Pr(X1)*Pr(X2) I would like to specify...

• Replies: 0
• Views: 4,311
10-08-2008, 10:02 AM
8. ### Arranging letters

What is the probability that an arrangement of a, b, c, e, f, g begins and ends with a vowel.

• Replies: 1
• Views: 4,274
10-08-2008, 02:13 AM
9. ### Forming a committee

How many ways can a committee be formed from four men and six women with four members, at least two of whom are women, and Mr. and Mrs. Baggins...

• Replies: 0
• Views: 2,707
10-08-2008, 12:13 AM
10. ### Find defective typewriters

A batch of 50 different automatic typewriters contains exactly 10 defective machines. What is the probability of finding: a) At least 1 defective...

• Replies: 0
• Views: 3,035
10-08-2008, 12:09 AM
11. ### Monty Hall

You are playing a game show, in which there are prizes behind three doors. One prize is good (eg a car), and the others aren't (eg. a goat and a...

• Replies: 1
• Views: 2,403
10-07-2008, 10:06 PM
12. ### problem of tossing a coin -- plz help

Three players A,B,C toss a fair coin in the order ABCABC... Find the probability that A is the first player to obtain a head, B the second & C the...

• Replies: 1
• Views: 3,048
10-05-2008, 11:36 PM
13. ### problem so simple its confusing?? need help

I need help with a homework problem. Because not all airline passengers show up for their reserved seat, an airline sells 125 tickets for a flight...

• Replies: 1
• Views: 5,235
10-05-2008, 04:18 PM
14. ### Find the joint density of Z=X+Y,W=X-Y

Question:Let X,Y be independent random variables with X~Exp(lambda1) and Y=~Exp(lambda2). Find the joint density of Z=X+Y,W=X-Y ...

• Replies: 1
• Views: 5,123
10-04-2008, 09:14 PM
15. ### probability help pugowner

14. A study was made to determine the calories, total fat content and sodium in 54 brands of “veggie” burgers as shown below. < 130...

• Replies: 5
• Views: 2,424
10-04-2008, 05:06 PM
16. ### Football Betting Method

Say I have 3 betting methods on football games. Each system is able to predict the winner with 60% accuracy. Method1: 60% Method2: 60% Method3:...

• Replies: 1
• Views: 4,131
DAV
10-04-2008, 05:00 PM

My problem: Calculate the number of possible outcomes if 4 tickets are randomly selected from 50 tickets. There are 4 different prizes & a ticket...

• Replies: 1
• Views: 2,182
DAV
10-04-2008, 04:17 PM
18. ### Probability: proving

Show that two events A,B are independent if and only if at least one of the following holds i) P(A/B)=P(A) or P(B/A)=P(B) ii) P(A)=0 or P(B)=0

• Replies: 1
• Views: 2,171
DAV
10-04-2008, 03:53 PM
19. ### Normal distribution probability density function returning values > 1

i am trying to draw a normal curve over a histogram of some data of mine and i just can't get it to come out right! Mean =1.002327404 Standard...

• Replies: 11
• Views: 6,362
10-03-2008, 04:50 PM
20. ### Cdf

Can someone explain how to solve this? I have to find the CDF for the following function: F(X) = 1/2 * Exp (-|X|) dx , (-inf < x < +inf) I know...

• Replies: 1
• Views: 1,891
10-03-2008, 12:51 PM
21. ### Weibull Distribution Help

"The time to failure, unable to continue delivery service for a delivery truck, has a Weibull Distribution with mean of 200k miles and standard...

• Replies: 0
• Views: 2,007
10-02-2008, 07:09 PM
22. ### Linear combination of empirical distributions for independent rvs

Hi there, I have n independent rvs: X1, ..., Xn. I have obtained the empirical distribution functions F1, ..., Fn for each of the rv. Is it...

• Replies: 0
• Views: 2,631
10-01-2008, 12:13 PM

Hello, Here is the problem. Assume that your drive time to work each morning follows a normal distribution with Mean= 20 min 24 sec, and stdev=...

• Replies: 0
• Views: 1,948
10-01-2008, 07:23 AM
24. ### Rolling a pair of dice.

http://www.cam.cornell.edu/~sharad/math407/midterm_sol.pdf I don't understand 3b. Why isn't the E1 union with E2 just sum of E1 and E2? I think...

• Replies: 4
• Views: 2,995
09-30-2008, 10:25 AM
25. ### add chi square or F distributions yields?...

Hi there, I have two questions: First: X1 follows X^2 distribution with n1 d.f. X2 follows X^2 distribution with n2 d.f. Then what is...

• Replies: 1
• Views: 3,459
09-29-2008, 06:01 PM
26. ### basic probability

My assignment question gives me the following info regarding the probability of system having 3 types of defects (type A1, A2, and A3): P(A1)=...

• Replies: 1
• Views: 2,823
09-28-2008, 06:29 PM
27. ### Confidence Intervals

Hi there, Can anyone help me with this question regarding confidence intervals? Q: 14.6% of New Zealanders identified with Maori ethnicity. For...

• Replies: 3
• Views: 3,160
09-28-2008, 01:56 PM
28. ### poisson distribution help

hey! i am having a hard time understanding this problem. i just need to know how to get started and then i am good from there. here is the...

• Replies: 1
• Views: 6,901
09-28-2008, 12:42 AM
29. ### Help Verifying Formulas

Hey all, I'm a bit stuck at verifying these following formulas are equivalent: Prove: (n Choose k) = (n choose n-k) so I got: =...

• Replies: 3
• Views: 3,090
09-26-2008, 08:50 AM
30. ### I need some help

Hello everyone, I'm new here and this is my first post. I have a couple of problems I need help setting up. First; A group of 100 diabetic...

• Replies: 3
• Views: 2,656
09-26-2008, 08:10 AM
31. ### I need help/advice for a probability model, mainly distribution (not homework)

I'm working on a baseball game projection model that I hope to have in full swing by next year. Anyway, the way I'm figuring out win probability now...

• Replies: 0
• Views: 2,207
09-25-2008, 02:46 AM
32. ### divide 2 chi square distribution

Hi there, Can anyone help me with this?? : If X1~ X^2 distribution with n1 d.f. and X2~X^2 distribution with n2 d.f. then what is...

• Replies: 1
• Views: 6,154
09-24-2008, 10:00 AM
33. ### Bayes Theorem Question

Hello all, I have a homework question which I can not figure out: A stock market analyst examined the prospects of the shares of a large number...

• Replies: 1
• Views: 5,189
09-22-2008, 11:42 PM
34. ### independence

p(a) = 0.1 and p(b) = 0.3 : assume these events are independent 1) prob of neither events occuring? I got 0.97 2) prob of at least one event...

• Replies: 4
• Views: 2,884
09-22-2008, 10:04 AM
35. ### Explantion of this p[assword combination problem

Q: A computer password must be 5 characters long, and must contain only letters and numbers. If you pick a password at random ( All valid passwords...

• Replies: 1
• Views: 2,255
09-20-2008, 09:32 PM

X) How many different eleven-letter words (not necessairly pronounceable or meaningful) can be made from the letters in the word MISSISSIPPI? ANS:...

• Replies: 4
• Views: 2,397
09-20-2008, 12:20 PM
37. ### how determine correlation by looking at distributions?

Hi Experts, I have an application related to DSP and probability/distributions I could *really* use some help with. I have a real-time...

• Replies: 1
• Views: 2,998
09-19-2008, 04:13 AM
38. ### Probability stack up

First off just wanted to say :wave: to everyone as this is my first post. I am currently a student engineer and have been assigned a project...

• Replies: 1
• Views: 3,270
09-18-2008, 04:56 PM
39. ### Successive events in Trial

The chance of tossing a coin and obtaining a tail is 1/2. The chance of tossing a coin and obtaining two sucessive tails is 1/4. The chance of...

• Replies: 1
• Views: 2,328
09-18-2008, 01:34 AM
40. ### Some Questions

i) find a formula for the number of sequences of 0's and 1's of lenght n such that the sum of the 0's and 1's in the sequence is k ii) prove that...

• Replies: 6
• Views: 2,469
09-15-2008, 09:23 AM
41. ### 99% CI for failure proportions

Hi, Is this working correct for a 99% CI for the difference between two proportions: p(A) = 11 failures out of 200 p(B) = 6 failures out of...

• Replies: 1
• Views: 2,512
09-15-2008, 04:13 AM
42. ### basic proofs/results in regression

I'm taking a regression class and were working on the location model just to get practice before the real thing. We've been given some proofs for HW...

• Replies: 2
• Views: 4,875
09-14-2008, 02:50 PM
43. ### sampling

Hi, I have a problem which I am sure has an easy answer Imagine that I have a box which contains 100 balls, 99 blue and 1 red. I want to use...

• Replies: 2
• Views: 2,717
09-11-2008, 12:43 PM
44. ### formulating probabilities

Could anyone help? Please! Joe Smith batted .347 in 2007. So assume the probability of getting a hit is .347 for each time he batted. In a...

• Replies: 1
• Views: 2,406
09-10-2008, 07:13 PM
45. ### problem where the teach doesnt teach

I am not 100% sure how to even start this. With the 2 variable I get lost Please any help Human visual inspection of solder joints on printed...

• Replies: 2
• Views: 8,860
09-10-2008, 06:53 PM
46. ### Hopefully an easy 'first post'!

Hi All. I'm a newbie to the forums, and will hopefully introduce myself with an eay-enough question on probability! OK, here goes: I have...

• Replies: 14
• Views: 5,110
09-09-2008, 03:01 PM
47. ### Gaming Problem

A player starts of with 10 points. If he reaches 1000 points he wins. Every time he plays, the chance of him winning is 40% Maximum everytime,...

• Replies: 3
• Views: 2,565
09-09-2008, 01:40 AM
48. ### Poisson with events per week for calculating probability per Quarter?

Hi all, I have a question regarding the Poisson distribution. (I searched the forum before creating this post, I couldn't find a similar post) ...

• Replies: 4
• Views: 5,170
09-05-2008, 11:31 AM
49. ### random variable?

A graduating senior seeking a job has interviews with two companies. After the interview, he estimates that his chance of getting an offer from the...

• Replies: 3
• Views: 3,734
09-04-2008, 07:10 AM
50. ### Joint distribution of noncentral t statistics

Hi, I need to compute a probability which is described by the joint distibution of 2 non-central t statistics. If somemody knows references...

• Replies: 4
• Views: 2,459
09-03-2008, 10:30 AM
51. ### Statistic question, what equation???

Suppose I have these measurements: 21, 21.4, 22, 21.3, 22, 22.7, 25. What formula do I use to determine the probability that either 21.3 or 22.5 will...

• Replies: 1
• Views: 1,778
09-03-2008, 02:20 AM
52. ### Stats probability

A bag initially contained 4 white marbles and 9 black marbles. A marble was drawn and replaced by 2 marbles.. of the opposite colour.. Then...

• Replies: 5
• Views: 3,814
09-02-2008, 09:25 AM
53. ### Expectation of sorted random variables

Hi all, I'm stuck on what I thought was a simple problem that appears to be somewhat trickier than I expected, and am hoping someone can point me...

• Replies: 1
• Views: 3,113
09-02-2008, 06:13 AM
54. ### de Morgan's law

I need help. I just can't figure out where to go with this one.. For two events A and B show that: P(A intersection B) is greater than or...

• Replies: 1
• Views: 4,805
09-02-2008, 03:12 AM
55. ### calculation of a probability

Hi there, I have the following problem: Suppose that: X~Exp(3) Y=bernoulli(p), where p=exp(x)/(1+exp(x)). What is P(Y=1|X>2)=??? (or...

• Replies: 2
• Views: 2,483
09-01-2008, 02:41 AM
56. ### Dice roll

Sorry if this topic has been discussed before. I hate looking through forums randomly for an answer to a question. So, maybe one of you could help...

• Replies: 6
• Views: 2,611
08-29-2008, 10:21 PM
57. ### if p( x|y)=p( y|x)=1

x, y, a are all rv, and a=/x, y, p(x|a)=/0 is p(x|a)=p(y|a)? Thanks!

• Replies: 0
• Views: 2,373
08-28-2008, 06:12 PM
58. ### Probabilty of picking higher number

I am working on a webbased game, and need help with some probability. Player A rolls a 20 sided die with the numbers 1 through 20. Player B rolls...

• Replies: 12
• Views: 3,537
08-28-2008, 12:02 AM
59. ### Need to find the distribution function

I have a probability function, and I would need the distribution for it, so I can calculate confidence intervalls. A nominal variable X can take R...

• Replies: 2
• Views: 2,772
08-27-2008, 03:13 AM

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