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Forum: Probability

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

  1. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,376
    09-30-2005, 09:44 AM Go to last post
  1. standard deviations in scatter plots

    I am working with data that involves blood volumes in the heart according to gestation. I have plotted these values using a twoway scatter graph. I...

    Started by jeantrines‎, 10-22-2010 12:35 PM
    • Replies: 1
    • Views: 6,717
    10-22-2010, 01:16 PM Go to last post
  2. converges almost surely

    I need to use this lemma for my prove, and I dont know how to prove this lemma. "X_n \rightarrow 0 a.s iff for all \epsilon > 0, P(|X_n| > \epsilon...

    Started by tup‎, 10-22-2010 01:08 PM
    • Replies: 0
    • Views: 2,720
    10-22-2010, 01:08 PM Go to last post
  3. converges in prob

    Let X_1, X_2, ... be independent with P(X_n = 1) = p_n and P(X_n = 0) = 1- p_n. Show that (i) X_n \rightarrow 0 in probability iff p_n \rightarrow 0,...

    Started by tup‎, 10-22-2010 10:04 AM
    • Replies: 2
    • Views: 2,184
    10-22-2010, 12:39 PM Go to last post
  4. Is this possible?

    Hi, please help me out with this problem. I want to calculate P(X <= x) = P(sum(1->n)(Z_k) <= x) where sum(1->n)(Z_k) is the sum of Z_k from 1 to...

    Started by TheNewbie‎, 10-22-2010 06:25 AM
    • Replies: 4
    • Views: 2,064
    10-22-2010, 08:23 AM Go to last post
  5. Random sample probability with no max population size

    Hi all, I have no clue what to do with the following question... In a random sample of 20 cassettes, what is the probability that at least two...

    Started by Tjvelcro‎, 10-21-2010 08:47 PM
    • Replies: 1
    • Views: 4,838
    10-21-2010, 08:55 PM Go to last post
  6. cant decide null and alternative

    . Last fall, a sample of n= 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate...

    Started by SadieKhan‎, 10-20-2010 01:25 AM
    • Replies: 7
    • Views: 4,945
    10-21-2010, 06:41 AM Go to last post
  7. i need help with this question of probability!

    I need help with answering this questions. Suppose that the fills in the soda pop bottle are normally distributed with mean 32.2 ounces and st...

    Started by skdjk100‎, 10-20-2010 08:50 PM
    • Replies: 1
    • Views: 4,995
    10-20-2010, 09:16 PM Go to last post
  8. Two Probability Questions

    1. 50 vaccines are tested on patients to see how well they treat a virus. The results of the tests are recorded in this table. ...

    Started by m1359‎, 10-20-2010 08:14 PM
    • Replies: 1
    • Views: 2,491
    10-20-2010, 08:37 PM Go to last post
  9. Question prob. questions

    Let we have 3 urns with a white, b black balls in each urn. We choose one ball from urn 1 and transform it to urn 2. Then, choose one ball from urn 2...

    Started by yuki‎, 10-20-2010 04:01 AM
    • Replies: 5
    • Views: 2,947
    10-20-2010, 05:01 PM Go to last post
  10. Expected Value of the Difference

    The heights of all male students in a university have mean 170 cm and standard deviation 10 cm. Two male students are randomly selected. What is...

    Started by Blooooooooo‎, 10-20-2010 01:21 PM
    • Replies: 3
    • Views: 8,883
    10-20-2010, 03:31 PM Go to last post
  11. Confidence Interval homework check if correct

    1. 68.6 I did this by solving for x with this equation .004=1.96(.14/sqroot of x) 2.84.72% I found this by finding zscore for 1.43 which was...

    Started by schoolboy29‎, 10-19-2010 02:11 PM
    • Replies: 5
    • Views: 4,491
    10-19-2010, 04:56 PM Go to last post
  12. Multivariate normal distribution

    Hi, I want to calculate expected value of a series. Where X = A + 2B +3C + ..... A = bivariate normal B = trivariate normal C =...

    Started by adnaniut‎, 10-19-2010 02:49 PM
    • Replies: 1
    • Views: 2,593
    10-19-2010, 03:47 PM Go to last post
  13. Finding E[X] and Var[X] of exponential distribution

    Transistors produced by one machine have a lifetime which is exponentially distributed with mean 100 hours. Those produced by a 2nd machine have an...

    Started by StatStudent3‎, 10-18-2010 09:23 AM
    • Replies: 7
    • Views: 10,239
    10-19-2010, 12:23 PM Go to last post
  14. Joint probability distribution table

    Helllo, I have this problem for an assignment: 1. It is known that box C has 3 blue balls, numbered from 1 to 3, and 2 red balls, numbered from 4...

    Started by bgrober‎, 10-18-2010 04:18 PM
    • Replies: 1
    • Views: 8,162
    10-18-2010, 05:16 PM Go to last post
  15. A little help with distributions

    I have been assigned a project that involves statistics and i have no idea about it. I was suppose to capture online game traffi and then using the...

    Started by saeen‎, 10-13-2010 12:39 AM
    • Replies: 8
    • Views: 3,454
    10-18-2010, 01:07 PM Go to last post
  16. Pricing and probablity problem

    Company 'A' sells an item and want to know what is the best price to sell it at. They have done some market research on the customers coming through...

    Started by dominios‎, 10-18-2010 03:37 AM
    • Replies: 1
    • Views: 2,285
    10-18-2010, 12:20 PM Go to last post
  17. Probability

    I dont know how to express this answer mathematically, please help? A coin is tossed three times. Express the probability that the oucome is: ...

    Started by SyncSA‎, 10-18-2010 05:07 AM
    • Replies: 1
    • Views: 1,949
    10-18-2010, 07:06 AM Go to last post
  18. Post test question

    At a large department store, the average number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years and the...

    Started by dailya1‎, 10-17-2010 09:28 PM
    • Replies: 1
    • Views: 5,878
    10-17-2010, 11:18 PM Go to last post
  19. Expected Value Problem

    The heights of all male students in a university have mean 170 centimetres and standard deviation 10 centimetres. Three male students are randomly...

    Started by vegluv‎, 10-09-2010 08:41 PM
    • Replies: 12
    • Views: 6,934
    10-17-2010, 10:23 PM Go to last post
  20. Anderson-Darling test appropriate?

    Hi, I have a large (>2500) number of z-scores and I want to test if the distribution of these deviates from a unit normal distribution. I have...

    Started by rhayman‎, 09-14-2010 03:17 AM
    • Replies: 6
    • Views: 11,867
    10-17-2010, 10:04 PM Go to last post
  21. Describe Sample Space

    Suppose you toss a fair coin until you obtain exactly R heads. 1) What is the probability that K tosses are required? 2) Describe your sample space....

    Started by jamesmartinn‎, 10-16-2010 08:51 PM
    • Replies: 2
    • Views: 6,915
    10-16-2010, 10:27 PM Go to last post
  22. simple probability question

    Is the P(A and A) = P(A) ? If that's not clear enough I have a question that is: Given that a random case is either A or B what is the...

    Started by oj2222‎, 10-14-2010 04:10 PM
    • Replies: 2
    • Views: 3,031
    10-14-2010, 06:55 PM Go to last post
  23. Probability Question

    You randomly pick 10 marbles from a large bag containing 1/6 red marbles. a. What are the chances that you pick exactly 4 red marbles? b. If 10...

    Started by stats_junkie‎, 10-14-2010 11:28 AM
    • Replies: 9
    • Views: 4,306
    10-14-2010, 03:10 PM Go to last post
  24. Pretty Basic probability question

    Thanks guys. Figured it out!

    Started by TampaBuff‎, 10-14-2010 10:08 AM
    • Replies: 5
    • Views: 3,184
    10-14-2010, 11:09 AM Go to last post
  25. Probability of 20-question test, binomial?

    20 true-false quiz to determine who has read a book. Shes wants to choose the passing grade such that the probability of passing a student who...

    Started by gator78‎, 10-12-2010 08:44 PM
    • Replies: 9
    • Views: 9,513
    10-14-2010, 12:28 AM Go to last post
  26. Scaling covariance and variance

    I have the variance and covariances for a number of assets(stocks), and i need to scale them from 1 month to a year. Would it be correct to think...

    Started by thedreamshaper‎, 10-13-2010 04:59 PM
    • Replies: 1
    • Views: 7,334
    10-14-2010, 12:16 AM Go to last post
  27. Probability HW

    Hi, I need some help figuring out the inclusion probability. Here is the problem: Unequal probability sampling is often unavoidable, so it is...

    Started by cwalte03‎, 10-13-2010 07:42 PM
    • Replies: 0
    • Views: 2,461
    10-13-2010, 07:42 PM Go to last post
  28. Joint PDF problem

    Hey folks, I've got a problem with a joint probability density function question. Given f(x, y) = 6(x^2)y for 0 <= x <= y, x + y <= 2 and 0...

    Started by Halfpixel‎, 10-21-2008 10:27 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 13,980
    10-13-2010, 05:20 PM Go to last post
  29. HELP! I brain cant solve it

    I have tried this problem 100 time and I cant solve it . here it is Of six cars produced at a particular factory,3 are known to be defectives and 3...

    Started by helpme!‎, 10-12-2010 10:10 PM
    • Replies: 2
    • Views: 3,186
    10-13-2010, 06:56 AM Go to last post
  30. probability , confusing table

    I am really confused with the table , I am not sure if I am doing it right, Can you have a look at my answers? 3. In smoking related research,...

    Started by SadieKhan‎, 10-12-2010 12:51 PM
    • Replies: 5
    • Views: 2,693
    10-12-2010, 07:23 PM Go to last post
  31. Is it Binomial?

    I am really stuck with this question, I am trying to figure out which distribution it is , can someone give me a hint plz?:( 2. A physician is...

    Started by SadieKhan‎, 10-12-2010 11:44 AM
    • Replies: 6
    • Views: 2,985
    10-12-2010, 06:53 PM Go to last post
  32. Angry Plz HELP im stuck !!!!

    Z=X+Y+2, W=X-Y Find f(z,w) >>> say Z=g(x,y) and W=h(x,y) then f(z,w)=double integral f(x,y)delta(z-g(x,y))delta(w-h(x,y))dxdy im stuch...

    Started by sajee3a‎, 10-12-2010 12:42 AM
    • Replies: 2
    • Views: 2,633
    10-12-2010, 12:27 PM Go to last post
  33. Question regarding Z Scale - Is my answer correct?

    Here is the question. A company markets salmon in cans. It claims that the net mean weight of the cans is 8 and the standard deviation is .04. ...

    Started by bej0520‎, 10-12-2010 08:43 AM
    • Replies: 2
    • Views: 4,165
    10-12-2010, 09:41 AM Go to last post
  34. System of 5 independent components

    I have done problems similar to this one with 4 components but im getting stumped with this one. The probability of FAILURE for each components is...

    Started by gator78‎, 10-11-2010 05:42 PM
    • Replies: 8
    • Views: 4,452
    10-12-2010, 09:25 AM Go to last post
  35. Genotype probabilities

    I'm having difficulty with this problem, although it seems easy. The possible genotypes of an organism are AA, Aa and aa (Aa and aA are...

    Started by root45‎, 10-11-2010 05:56 PM
    • Replies: 1
    • Views: 7,848
    10-11-2010, 11:59 PM Go to last post
  36. Plase! I need urgent Help, MLE

    hello i'm really stucked with this problem. hope anybody oould help me out. Thanks!!

    Started by bluefire‎, 10-11-2010 11:08 PM
    • Replies: 1
    • Views: 2,501
    10-11-2010, 11:44 PM Go to last post
  37. Probability of combinations of events

    Hello, I am trying to solve the following problem: We have a set of events and we know the probability of each event. We do not have values for...

    Started by steve1010‎, 10-11-2010 09:27 AM
    • Replies: 2
    • Views: 7,848
    10-11-2010, 11:38 PM Go to last post
  38. Help with basic proportions

    The Saloon claims that their pints, on average, are 16 ounces. To test whether the Saloon is actually pouring LESS than 16 ounces (at the .025...

    Started by brownclown‎, 10-11-2010 08:02 PM
    • Replies: 0
    • Views: 5,036
    10-11-2010, 08:02 PM Go to last post
  39. Cumulative distribution help.

    Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

    Started by c2q‎, 10-10-2010 08:10 PM
    • Replies: 11
    • Views: 6,010
    10-11-2010, 06:25 PM Go to last post
  40. Probability of radar detection

    Aircraft is in certain area, radar correctly registers its presence with prob. of 0.95. If it is not present, radar falsely registers its presence...

    Started by gator78‎, 10-09-2010 10:47 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 11,517
    10-11-2010, 02:39 PM Go to last post
  41. Help plz

    Two RVs X and Y have the joint density f(x,y)=e^(-|x|-|y|) /4 Are these RVs independent? >> i can prove if they are independent or not by...

    Started by sajee3a‎, 10-10-2010 11:51 PM
    • Replies: 1
    • Views: 2,221
    10-11-2010, 12:19 AM Go to last post
  42. Unhappy probability of expected mean?

    Hey, so I've been having trouble with this problem. I'm not really sure what formulas to use or how to do it. Any ideas to help point me in the right...

    Started by marrone12‎, 10-10-2010 06:30 PM
    • Replies: 1
    • Views: 2,379
    10-10-2010, 07:09 PM Go to last post
  43. P value two tail test estimation formula

    Hi Thanks in advance for reading my question. For my stats class, we have estimate p value using the charts. And then we compare that outcome to...

    Started by ealeql‎, 10-10-2010 12:44 PM
    • Replies: 0
    • Views: 6,040
    10-10-2010, 12:44 PM Go to last post
  44. Distribution using pmf

    X=demand for the magazine with pmf x 1 2 3 4 p(x) .1 .2 .4 .3 Shop owner pays $1.00 for each copy of mag. and charges $2.00. If mags. left at...

    Started by gator78‎, 10-09-2010 10:49 PM
    • Replies: 1
    • Views: 3,420
    10-10-2010, 03:58 AM Go to last post
  45. Normal Distribution

    try this guys, I only got 4 out of 9 trying :mad: Simply solutions would be generous:tup: I tried to solve these problems Z= (x-)/sigma but im...

    Started by dontgetnormaldist‎, 10-09-2010 11:49 PM
    • Replies: 1
    • Views: 4,071
    10-10-2010, 12:06 AM Go to last post
  46. ????HOW to decide Independance of 2 RVs thru joint density without calculation????

    given the joint density:f(x,y)=(x+1)(y+1)/8, |x+y|<=1, |x-y|<=1 Find the boundries of the domain of these RVs before any calculations. Are...

    Started by sajee3a‎, 10-09-2010 12:07 AM
    • Replies: 0
    • Views: 2,030
    10-09-2010, 12:07 AM Go to last post
  47. Probability of Events - Accident Stats

    I am trying to figure out the likelihood that a series of accidents is either indicative of a problem or not, in other words how rare is this series...

    Started by wolfego‎, 10-08-2010 04:46 PM
    • Replies: 1
    • Views: 6,010
    10-08-2010, 05:27 PM Go to last post
  48. Probability density function

    I have a problem on one part of the four parts of this question. Here it is: The probability density function of the time customers arrive at a...

    Started by statsec‎, 10-08-2010 09:19 AM
    • Replies: 5
    • Views: 11,832
    10-08-2010, 03:00 PM Go to last post
  49. Dependent normal distributions

    I'm doing some stock market analysis for a personal project. If I have two stocks which generate returns which are normally distributed, what is...

    Started by jstonge‎, 10-07-2010 05:17 PM
    • Replies: 4
    • Views: 9,016
    10-08-2010, 01:33 PM Go to last post
  50. Probability Mass Function

    I am given that X follows the geometric distribution and asked to give the probability mass function for X^2. I know that the probability mass...

    Started by math_guy314‎, 10-07-2010 08:38 AM
    • Replies: 5
    • Views: 4,992
    10-08-2010, 11:23 AM Go to last post
  51. NEED HELP with joint density problem

    Two RVs X & Y have the jiont density: f(x,y)=a, x^2+y^2<=1 Find the constant a. >>> HOW CAN I SOLVE THIS ???can i say that z=x^2+y^2

    Started by sajee3a‎, 10-07-2010 12:05 AM
    • Replies: 5
    • Views: 3,349
    10-08-2010, 12:48 AM Go to last post
  52. from Uniform random variable to Logistic

    Given U~Unif(0,1) and X=s*ln(U/(1-U)), where s>0 is a parameter, I am hoping to get F(x), where F(x) would turn out to be a logistic cdf F(x) =...

    Started by zzzc‎, 10-07-2010 10:25 PM
    • Replies: 4
    • Views: 2,901
    10-08-2010, 12:21 AM Go to last post
  53. Does 'among' mean conditional or joint probability

    I've been given the following chart about ppl who went through drug treatment and about whether they were subsequently convicted years later with...

    Started by int3‎, 10-07-2010 06:45 PM
    • Replies: 3
    • Views: 3,804
    10-07-2010, 11:57 PM Go to last post
  54. Probability Mass Function

    I have a question about probability mass function. I understand the simple problems with a toss of a fair coin etc. I have a slightly more...

    Started by LizzyB‎, 10-07-2010 11:04 PM
    • Replies: 1
    • Views: 4,192
    10-07-2010, 11:23 PM Go to last post
  55. Probability question in section involving conditonal probability

    With probability of 1/6 there are i defective fuses among 1000 fuses (i = 0, 1, 2, 3, 4, 5). If among 100 fuses selected at random, none was...

    Started by Zennie‎, 10-07-2010 12:24 AM
    • Replies: 1
    • Views: 7,046
    10-07-2010, 10:42 AM Go to last post
  56. Expected Value Question

    I have been given f(x) = c*2^x where x = 1,2, ..., N. First, I had to determine the value of c such that f is a probability mass function. This is...

    Started by math_guy314‎, 10-06-2010 05:06 PM
    • Replies: 1
    • Views: 2,656
    10-06-2010, 05:51 PM Go to last post
  57. A question on the Poisson process

    Let N be a Poisson process with rate 1, T^{(\lambda )} be an exponential random variable with rate \lambda independent of N, and U^{(\lambda)} be...

    Started by tzelios‎, 10-06-2010 03:29 AM
    • Replies: 3
    • Views: 3,206
    10-06-2010, 01:34 PM Go to last post
  58. need some probabilty help ASAP please

    Hey guys need some help asap please, if i know the percentiles p10 p50 and p90 figures, which formula do i use to calculate the mean? cheers

    Started by saeedbs‎, 10-06-2010 03:32 AM
    • Replies: 2
    • Views: 3,013
    10-06-2010, 04:12 AM Go to last post
  59. Need help with a problem with Indicator Random Variable

    A building has 10 floors above the basement. 12 people get into an elevator at the basement, and each of the 12 chooses one of the 10 floors at...

    Started by StatStudent3‎, 10-05-2010 10:32 AM
    • Replies: 3
    • Views: 8,934
    10-05-2010, 07:24 PM Go to last post
  60. Is P(A n B) the same as P(B n A)?

    As the topic says. If we have two events A and B respectively, is it possible that P(A n B) != P(B n A)? This isn't a homework question but its...

    Started by c2q‎, 10-05-2010 03:24 PM
    • Replies: 1
    • Views: 12,449
    10-05-2010, 03:44 PM Go to last post

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