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05-10-2017
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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: 30,208
09-30-2005, 09:44 AM
1. ### Probability Question

Hi everyone, I have been working on this problem and I think no solution is possible. Please check and see if maybe I am misunderstanding...

• Replies: 2
• Views: 1,866
07-09-2009, 12:01 PM
2. ### Poisson Question! Please help!

So the question is: A restaurant chef prepares a tossed salad containing, on average, 5 vegetables per day. Find the probability that the salad...

• Replies: 3
• Views: 5,238
08-11-2009, 12:06 PM
3. ### Not sure if I did this right! Please help!

An oil drilling company ventures into various locations, and their success or failure is independent from one location to another. Suppose that the...

• Replies: 6
• Views: 4,075
08-12-2009, 07:44 AM
4. ### Hopelessly stuck! Please help!

An electronic switching device occasionally malfunctions and may need to be replaced. It is known that the device is satisfactory if it makes, on...

• Replies: 10
• Views: 3,950
08-12-2009, 10:03 AM
5. ### Another one!

I think this is correct. I would appreciate any input. Question: The potential buyer of a particular engine requires that the engine start...

• Replies: 2
• Views: 3,037
08-17-2009, 10:17 AM
6. ### Request for help on probability.

Hi All, I need your help to solve this question. I am preparing for exam and trying to solve this question. A ball is selected from a box...

• Replies: 1
• Views: 1,058
01-07-2015, 03:47 PM
7. ### creating sten scores

Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

• Replies: 0
• Views: 5,989
03-20-2006, 12:01 AM
8. ### I am not sure how to solve for a probability when N is not given (beginner help).

I am having the most trouble with part "a)" but I am comparing the two answers so if you feel inclined to discuss part "b)" as well, I would...

• Replies: 6
• Views: 1,217
11-10-2014, 12:31 PM
9. ### 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: 6,677
10-14-2008, 02:16 PM
10. ### 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: 2,256
10-26-2008, 01:41 PM
11. ### uniform dist. parameter est.

Here is the problem: Use MLE to estimate the parameters of the two parameter uniform pdf f_Y_(y;theta1,theta2)=1/(theta2-theta1);...

• Replies: 1
• Views: 2,567
11-06-2008, 02:08 PM
12. ### Statistic & Probability

I am having problems completing assignment of 8 problems. I do not know what I am doing and I need this course to graduate in the spring. I would be...

• Replies: 1
• Views: 2,944
11-20-2008, 03:00 PM
13. ### Normalized Z-Table Questiong Is this right having problem with final answer

The amount of time it takes to produce a part is normally distributed with a mean equal to 10 second and standard deviation equal to 2 seconds. Fine...

• Replies: 2
• Views: 2,603
10-10-2016, 07:43 PM
14. ### Binomial Probablity Distribution exactly one & and at least one.. check my answer

Your favorite baseball player has a 0.300 batting average (that is, he averages three hits for every 10 times he is up to bat). If he is up to bat...

• Replies: 3
• Views: 2,412
10-11-2016, 02:35 PM
15. ### 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: 2,795
BGM
09-14-2011, 08:48 AM
16. ### Probability of simply "guessing" in a Blind Triangle taste test

Hi, I am a new member to these forums and I have a problem that’s been bugging me. A huge thank you for any help with this one. It’s an odd one. I...

• Replies: 3
• Views: 4,087
03-27-2013, 10:19 AM
17. ### WANT Theoretical Probabilities theory books suggestion

Hello, I am reading a theoretical probability theory book " Probability Theory: The Logic of science " by E.T.Jaynes. But, this book is very advanced...

• Replies: 1
• Views: 1,331
06-21-2015, 01:50 AM
18. ### Forecasting help needed for google

Can someone help me with the formula I'd need in order to forecast search results? Here's the problem: Month 1: variable A increases from rank...

• Replies: 2
• Views: 2,335
02-10-2009, 07:04 PM
19. ### Challenging Probability Question

An analyst is presented with lists of four stocks and five bonds. He is asked to predict, in order, the two stocks that will yield the highest return...

• Replies: 2
• Views: 4,073
03-03-2006, 01:37 AM
20. ### random sample probability question

A company produces cola. The amount of cola in a can is a random variable that is normally distributed with a variance of 0.81 ml. A random sample of...

• Replies: 2
• Views: 3,246
03-08-2006, 02:11 PM
21. ### random sampling question - I need help

A journalist wanted to learn the views of the chief executive officers of the 500 largest United States corporations on program trading of stocks. In...

• Replies: 2
• Views: 2,405
04-01-2006, 01:20 AM
22. ### Need help with probability

A local public-action group solicits by telephone. For a particular list of prospects, it was estimated that for any individual, the probability was...

• Replies: 2
• Views: 3,699
04-03-2006, 12:40 PM
23. ### Probability

What are the odds of miss by one all lottery number. In my country the lotto is 38C6. Let say the winning number were: 06, 11, 18, 26, 30, 33 ...

• Replies: 1
• Views: 2,435
10-11-2016, 03:57 PM
24. ### probability that mean is less that

Hi everydoby, I have a data. Now I want ot find the probability that the weibull mean of this data is less that 10. does the result of...

• Replies: 0
• Views: 1,274
01-12-2012, 03:26 PM
25. ### Bayesian serial chain

I am trying to understand Bayesian networks and particularly causal (serial) chains. It is defined as P(C|A&B) = P(C|B).This means that the...

• Replies: 0
• Views: 1,429
01-23-2016, 01:06 PM
26. ### Bayesian formula with multiple events

I am trying to predict next location of the user knowing his current (t) and previous location (t-1). I am trying to use Bayesian networks for this....

• Replies: 0
• Views: 1,175
01-23-2016, 10:44 AM
27. ### counting problem?

A closet contains 6 diﬀerent pairs of shoes. Five shoes are drawn at random. What is the probability that at least one pair of shoes is obtained?

• Replies: 2
• Views: 1,251
11-11-2013, 05:48 PM
28. ### string counting problem

We consider permutations of the string ”ABACADAFAG”. How many permutations are there? How many of them don’t have any A next to other A? How many...

• Replies: 0
• Views: 1,267
10-22-2013, 06:15 PM
29. ### Bayes thoerem, can you check my solution please?

Hi, I'm terrible at statistics, i hope someone can help. A ship sank into the sea and is now laying in a fixed but uknown position on the bottom...

• Replies: 6
• Views: 2,163
03-05-2012, 12:20 PM
30. ### Monty Hall cf. Deal or No Deal

Hi We have been having a (rather heated!) discussion regarding why the Monty Hall problem does/does not apply to Deal or No Deal. Wikipedia states...

• Replies: 3
• Views: 4,783
01-24-2009, 11:28 AM
31. ### Emperical Rule

In finding the upper and lower bound with 95% confidence, I input numeric data and use descriptive stat on excel for mean and standard deviation....

• Replies: 0
• Views: 2,832
10-21-2016, 11:21 PM
32. ### Probability Problem

I am not sure where how to do this problem. This is what is says Suppose someone passes you a six sided die and bets £100 that you will through...

• Replies: 1
• Views: 2,053
08-03-2010, 06:52 PM
33. ### Binomial probability problem

I have a problem working out the answer to this problem using the binomial formula. Assume an airline operates a short haul flight form Edinburgh...

• Replies: 4
• Views: 3,274
08-04-2010, 10:57 AM
34. ### Probability Question

A question in a tutorial I had was: A bank manager is presented with the details of ten accounts of which two are overdrawn. If he selects three...

• Replies: 9
• Views: 3,012
08-05-2010, 05:29 PM
35. ### Probability of FTSE 250

My Quantitative Methods exam is tomorrow and I really need help with this question, in case this question comes up in the exam. The question is...

• Replies: 1
• Views: 2,160
08-11-2010, 02:58 PM
36. ### Probability Model Question

Hi, if you could help me out with the question below I would really appreciate it. Thanks. A quiz consists of three True-False questions. A...

• Replies: 0
• Views: 3,276
06-21-2009, 10:39 PM
37. ### 2 questions: Finding the optimal value of the mean of a standard normal distribution.

I have two questions involving the Standard Normal Distribution. The first one involves finding the optimal mean, the second one involves proving...

• Replies: 1
• Views: 2,819
BGM
11-06-2011, 04:02 PM
38. ### Question about exponential distribution

Okay, because P(Y) is an exponential function with mean of 10, I know a=1, B=10 P(Y) = (1/B)e^(-y/B), or (1/10)e^(-y/10). I'm stuck with what to do...

• Replies: 3
• Views: 6,598
BGM
11-16-2011, 12:00 AM
39. ### Continuous Multi-variablel Distribution question

I'm doing some problems with multi-variable probability distributions and marginal distributions. I think I'm doing them right, but they don't feel...

• Replies: 0
• Views: 885
12-03-2011, 06:00 PM
40. ### Poisson distribution and moment generating function question

This is a problem my professor assigned for homework. He said if we can't do it, it's not a big deal; it's a difficult problem. I'd still like to...

• Replies: 3
• Views: 5,758
02-05-2012, 04:45 PM
41. ### Point Estimation, Bias, and Mean Square Error question

The reading on a voltage meter connected to a test circuit is uniformly distributed over the interval (theta, theta + 1), where theta is the true but...

• Replies: 1
• Views: 7,010
02-12-2012, 02:55 PM
42. ### Chi-Square distribution problem

So my professor started doing stuff with the chi-square distribution this week and I've been lost for almost the entire time. Consider a random...

• Replies: 7
• Views: 9,506
02-18-2012, 05:50 PM
43. ### 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: 2,813
02-21-2012, 06:40 PM
44. ### Two questions: one about bias/MSE and one about confidence intervals

1. Y1, Y2, .... , Yn are a random sample from the Poisson distribution with parameter (mean) lambda > 0. Show that the square root of the sample...

• Replies: 1
• Views: 1,954
BGM
02-29-2012, 05:42 AM
45. ### Confidence Intervals using Most Likely Estimators

I have data that follows an exponential distribution. I need to find a 95% confidence interval of the following (using the MLE function): 1. The...

• Replies: 3
• Views: 1,798
03-18-2012, 03:37 PM
46. ### Weird Hypothesis testing with normal distribution -> binomial distribution

For a random sample of size n=64 from the Normal distribution with a standard deviation=1.22 known tset for a mean, of the hypotheses H0: mu=5...

• Replies: 0
• Views: 1,701
04-12-2012, 02:30 PM
47. ### Maximum likelihood estimator for a specific value of Y

Let Y1,Y2,Y3,...,YN denote a random sample of size n from a Poisson distribution with mean lambda. a. Determine the MLE for P b. Obtain (as a...

• Replies: 1
• Views: 2,502
04-12-2012, 03:43 PM
48. ### Practical Birthday-Month probabilities

Hello, I have a practical question that arose in a company gathering last week and as a biologist with very little statistic background I am looking...

• Replies: 3
• Views: 1,504
BGM
03-23-2015, 04:37 PM
49. ### Multiple comparisons in SEM

Hello, I am using the Multiple Group Analysis function in AMOS to compare three groups. I am using pairwise comparisons to compare group 1 with...

• Replies: 0
• Views: 1,246
09-24-2013, 10:30 AM
50. ### Exponential (θ ) distribution question

Xsub1 and Xsub2 are independent Exponential ( θ ), θ >0, random variables. Let S= Xsub1 +Xsub2 Write the PDF of S stating any standard...

• Replies: 1
• Views: 27,800
BGM
11-08-2012, 11:41 AM
51. ### probability

A project director runs a staff consisting of 6 scientists and 3 lab technicians. Three new projects have to be worked on and the director decides to...

• Replies: 1
• Views: 2,664
05-10-2006, 07:17 PM
52. ### prob word problem Q

A growing manufacturing company has kept careful records of applicants who have applied for jobs on their assembly lines. The probability that a new...

• Replies: 1
• Views: 2,907
05-16-2006, 12:10 PM
53. ### probability geneticist

I was able to answer the first 3 parts of this question but i cant figure out the last one A geneticist has bred three different strains of...

• Replies: 1
• Views: 2,725
05-24-2006, 08:02 PM
54. ### another probability

this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

• Replies: 2
• Views: 2,644
05-25-2006, 09:05 PM
55. ### Probability of developing a lung cancer disease

I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample...

• Replies: 5
• Views: 2,033
03-01-2017, 06:30 PM
56. ### Question trouble...

Working on this for a class and wondering if I did this correctly. If anyone could help that would be great. Thanks in advance! 60% of the...

• Replies: 2
• Views: 2,405
09-28-2009, 10:50 PM
57. ### Conditional probability answer check

I just want to check my answer with you guys. A supermarket wants to know peoples shopping habits. 250 were surveyed. 60% was females. 70% of all...

• Replies: 1
• Views: 1,465
10-15-2015, 09:36 PM
58. ### Help in understand this formula

Hello to all, I'm working on a problem which is as follow: There is a buffer which has maximum K capacity to store items. When a request for an...

• Replies: 1
• Views: 772
08-03-2012, 10:20 AM
59. ### Probability in rates

Hello there, I've got a problem that is probably very simple but I just can't figure it out. Imagine that there is an event A that can happen...

• Replies: 2
• Views: 1,739
02-22-2012, 04:14 PM

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