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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: 31,080
09-30-2005, 09:44 AM
1. Do independent experiments lend extra weight to probability?

There are two categories of objects, A and B. From long term observation, experiment 1 is known to be 70% accurate i.e. it predicts type A or B...

• Replies: 2
• Views: 2,044
04-25-2015, 02:01 AM
2. Immortality and Conditional Probability

- Hopefully, I won't aggravate readers so much with this approach. - Here, my claim is simply that the likelihood of my current existence is...

• Replies: 71
• Views: 15,674
04-22-2015, 06:50 AM

Hi guys! I have a question: There is link on the main google page with CTR 1.5% (CTR is number of clicked visitors divided by number of all...

• Replies: 0
• Views: 1,048
04-19-2015, 11:51 AM
4. Redundancy probability in employment

The idea of being made redundant after working so many years in a company is everyone's nightmare. I am currently working in a company employing...

• Replies: 2
• Views: 1,551
BGM
04-18-2015, 01:40 AM
5. Using MLE to find the right distribution

Hi, I know that MLE can be used to find the best fitting parameter assuming a that the distribution is known, but is there a way (using Excel or...

• Replies: 2
• Views: 1,440
04-15-2015, 10:20 PM
6. How to calculate combined probability of causally-linked events: joint probability?

Hello, I'm a statistics novice trying to understand how to approach what I suspect is a fairly basic probability problem. I'd be very grateful for...

• Replies: 0
• Views: 2,208
04-15-2015, 06:44 AM
7. How to efficiently allocate marketing dollars among various media?

Should I use expected return on investment for the Net, direct mail flyers, cold calling, etc., and then divide the money or just dump all of it...

• Replies: 0
• Views: 1,588
04-14-2015, 01:12 PM
8. The probability of cannibalism

Hi, I am interested in calculating the probability of cannibalism occurring in groups of fish (25). The species I am looking at are known to...

• Replies: 1
• Views: 2,166
04-14-2015, 01:03 AM
9. Joint Distributions and a 3rd Variable

I am struggling with this probability problem. Consider the random variables X and Y with joint distribution as given below. X 0 1 ...

• Replies: 1
• Views: 930
BGM
04-12-2015, 10:53 AM
10. Risk Management

There is 3% coral coverage in a sea area of l=200m b=5m. The size(diameter) of each coral is 50 cm. If we throw a block of 1m2 in the area. How many...

• Replies: 2
• Views: 1,743
04-11-2015, 07:36 PM
11. Continuous joint entropy with fully dependent variable

Consider a variable X with a continuous uniform distribution in the interval and a variable Y that is fully dependent on X, i.e., p(Y=y |...

• Replies: 0
• Views: 1,361
04-11-2015, 04:59 PM
12. Searching for a probability distribution where expected value is zero.

Hi, I am working on an agent based model. And, in the model every agent has an action. The action leads to a certain pay-off. The assumption is...

• Replies: 1
• Views: 1,439
04-08-2015, 01:25 PM
13. Immortality & Bayesian Statistics

- I seem to have written an 8 page paper virtually proving -- through Bayesian statistics -- that we are immortal (or something similar). Obviously,...

• Replies: 81
• Views: 17,722
04-06-2015, 05:11 PM
14. family game: how many combinations are possible?

Hi guys I'm almost getting crazy. We are playing a game in our family and i wanted to demonstrate my son for what probability is useful. Now i am...

• Replies: 1
• Views: 1,227
BGM
04-06-2015, 06:44 AM
15. Normal Approximation to the Binomial Distribution

Hello everyone. So, I was trying to solve some exercises on the normal distribution and the approximation of Normal to Binomial but I just can't...

• Replies: 0
• Views: 1,521
04-05-2015, 04:30 PM
16. Estimate of variance in mean of one population removed from another

Hello, Thanks for looking at my post! I have a some 40,000 items for which I have calculated the mean and standard deviation of a property,...

• Replies: 0
• Views: 1,449
04-02-2015, 05:00 AM
17. Rolling a die 600 times

So I was given a question that states that "A gambler buys a new die and throws it 600 times. Assuming the die is unbiased, estimate the probability...

• Replies: 2
• Views: 3,703
04-01-2015, 12:55 PM
18. My web pages on finding probabilites of runs

I now have several pages up on the topic. The starting page is: http://home.ptd.net/~artnpeg/RUNS.html I cover derivations of algorithms, js and...

• Replies: 0
• Views: 1,360
03-30-2015, 07:48 AM
19. Combining two normal distrubtions, 1 of which is for a project which may not happen

Hello, I have to 2 projects: Project A: Median: \$450k, Variance: 625 Project B: Median: \$750k, Variance: 1250 Combined Freqency Distribution:...

• Replies: 2
• Views: 1,412
BGM
03-30-2015, 06:33 AM
20. Multiple-testing correction in Moderation analyses

Hi Everyone! In an exploratory attempt, I ran 35 moderation analyses (both 2-way and 3-way interactions) of which 7 were significant. NOw the...

• Replies: 0
• Views: 1,275
03-27-2015, 12:25 PM
21. Roulette probability question

Hello I have a basic but quite difficult question about roulette probabilities (assuming roulette has 37 numbers 0-36). I need a general formula for...

• Replies: 4
• Views: 1,599
Kav
03-25-2015, 05:16 PM
22. 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: 1,641
BGM
03-23-2015, 04:37 PM

Hi, Am I understand the students' score order correctly? On a psychology exam with m = 76 and = 12, Tom scored 8 points below the mean, Mary had a...

• Replies: 2
• Views: 2,749
03-21-2015, 06:38 PM
24. Thumbs Up or Down on my logic

Very rusty on my statistics and will appreciate validation or correction on my thinking. "Fair" playing field - 88 players (18 in red shirts, 70...

• Replies: 5
• Views: 1,696
BGM
03-21-2015, 02:30 PM
25. One problem - two approaches, two different answers

A test is based upon the average of 5 results. Assuming only random errors in measurement, what is the probability the data is trended (sequential...

• Replies: 0
• Views: 1,249
03-20-2015, 12:52 PM
26. Probability problem

I am stuck, kindly help. There are two men V1 and V2. Each man has two buckets A and B. Bucket A contains numbered blocks from 7 to 14. Bucket B...

• Replies: 3
• Views: 1,510
03-20-2015, 08:33 AM
27. Simple probability question

Hi everybody, I have a really simple question to ask. Let us suppose to have a box with a button. This box contains an unknown number of white...

• Replies: 1
• Views: 1,144
03-19-2015, 08:20 AM
28. Bayesian and Probability

A certain disease has infected 2% of the population. The firm has annoucned that 90% of those infected will show a postive test result , while 95% of...

• Replies: 14
• Views: 2,802
03-18-2015, 03:39 PM
29. Having a pdf V and then defining a new one as W=V+1 & range of values

The question goes as follows, there's a function V that equals 0.5 for -1<v<=1 and 0 otherwise. From this we define a new function W that is defined...

• Replies: 1
• Views: 1,185
BGM
03-18-2015, 07:58 AM
30. Help solving probability scenario

I play in a pool league and 4 of my teammates and I were busy practicing when we happened across an interesting scenario: Between 5 of us we...

• Replies: 12
• Views: 2,409
03-17-2015, 06:29 AM
31. Question about a Bernoulli experiment.

Hi everyone. I have a problem on my mind as well as a solution for it, but I want to check if there are some other ways of solving it. So, let's...

• Replies: 2
• Views: 1,361
03-14-2015, 04:33 PM
32. Simulate and sample from a group

I'm confused with a question as follows: Consider the case that the total number of accidents happening in a highway in one day follows the...

• Replies: 0
• Views: 1,023
03-14-2015, 05:48 AM
33. get a distribution of x from y

Hello I have two variables x and y with a roughly linear relationship and good correlation. I have been given a y value and I want to get a...

• Replies: 0
• Views: 1,384
03-13-2015, 12:43 PM
34. Random Variable of two other random variables. Confusion to the max!

Here is the question at hand: I don't even know how to begin this question. I'm not looking for a complete solution per se but I don't even know...

• Replies: 1
• Views: 1,435
BGM
03-13-2015, 03:14 AM
35. Probability dilemma?

Hey everybody.. So my friend and I (high school seniors) had a bit of a disagreement. To get to the point, my contention is that, the more...

• Replies: 3
• Views: 1,707
03-11-2015, 10:35 PM
36. Which method to solve...

I just need direction...which method do I use to solve these two problems... 1) 2011 NYC had such and such number of accidents between Mon-Fri,...

• Replies: 1
• Views: 1,496
03-11-2015, 07:48 AM

5. A bag contains 7 red marbles and 5 yellow marbles. From the bag, 3 marbles are taken randomly at once. How many ways exist if all 3 taken marbles...

• Replies: 0
• Views: 1,070
03-10-2015, 09:56 PM
38. Counting question

4 selections of single digits are made at random with replacement, from the 10 digits 0-9. Find the probability that these sum to 20. I thought...

• Replies: 1
• Views: 1,215
03-10-2015, 02:24 AM
39. Distribution of Sample Mean Question

Hi, I have a bit of a problem with constructing a sampling distribution of the mean. The question itself is relatively simple: A population...

• Replies: 1
• Views: 1,362
BGM
03-07-2015, 06:23 AM
40. Determine distribution given moment generating function

I am given two moment generating functions, and need to calculate some probabilities regarding them. The first is: M(t) = ((2/3)e^t + (1/3))^3 ...

• Replies: 1
• Views: 1,560
03-06-2015, 02:49 AM
41. Probability help

never mind, solved it

• Replies: 0
• Views: 1,339
03-05-2015, 05:25 PM
42. Binomial Distribution Question

Hey guys, I have a bit of trouble understanding this binomial distribution question According to the call center statistics of a company, on...

• Replies: 5
• Views: 1,980
03-05-2015, 10:43 AM
43. Probability help for a beginner

Hi all, I've spent a long time analysing football (soccer) matches to rate teams and try and work out probabilities of various teams winning. ...

• Replies: 0
• Views: 1,584
03-02-2015, 03:22 PM
44. Game probability query

I'm trying to develop a game idea - a kind of passport bingo. 200 people each have passports. Each passport has a 9 digit number. If I read out a...

• Replies: 0
• Views: 1,318
02-27-2015, 07:05 AM
45. Poisson Distribution with two different expected value

Question: Suppose there are number of accidents at location A and location B each day with Poisson Distribution with rate 0.001 and the number of...

• Replies: 2
• Views: 1,562
02-26-2015, 07:38 AM
46. Second Order Stochastic Dominance

how can I test for second order stochastic dominance? is easy to understand the idea but when I have to normal distributions with different means and...

• Replies: 2
• Views: 3,354
02-25-2015, 03:42 PM
47. Mixed Poisson Distribution Help

Question: The number of accidents follows a Poisson distribution with mean 12. Each accident generates 1, 2 or 3 claimants with probabilities...

• Replies: 1
• Views: 1,299
02-25-2015, 02:12 PM
48. Statistics HEEELLPPP!!

A lot of 1000 components contains 250 that are defective. Two components are drawn at random and tested. Let A be the event that the first component...

• Replies: 1
• Views: 4,847
02-24-2015, 11:14 PM
49. Symbol for Mean of Probability Distribution

“mu” is the symbol for the mean of a population, “x-bar” is the symbol for the mean of a sample, and “mu of x-bar” is the symbol for the mean of the...

• Replies: 1
• Views: 1,945
02-24-2015, 11:48 AM
50. Trying to handicap the outcome of a race based on given probabilities

Hello everyone. The past year or so I've been generating projection models for various sports to predict the performance of individual players....

• Replies: 0
• Views: 2,282
02-20-2015, 05:22 PM
51. Normal Distribution times constant

I can't seem to find anything about this on the web. If I have a random variable distributed Normally: x ~ Normal(mean,variance) is the...

• Replies: 4
• Views: 35,217
02-18-2015, 09:45 PM

The Central Limit Theorem (CLT) involves taking repeated samples of size n from a population. That is, the process involves two things: the number...

• Replies: 1
• Views: 3,342
02-18-2015, 11:11 AM
53. D&D GM Needs Help Calculating Stat-Upgrades

Hello! I've never taken a stat class, so bear with me if this seems basic. I have searched for a while for a solution to this, but nothing has been...

• Replies: 3
• Views: 1,254
02-18-2015, 12:45 AM
54. [ASK] Combination: Am I Doing This Right?

Among 10 candidates of Students Council members, 3 people will be selected to undergo training. The number of possible ways to do so if 1 candidate...

• Replies: 2
• Views: 1,648
02-17-2015, 10:06 PM
55. Probability Question - Express in terms of P

Hi, I am currently stuck on a probabilities question and I was wondering if anyone could help me a bit. A and B are two events. Suppose that ...

• Replies: 1
• Views: 1,259
02-17-2015, 04:51 PM
56. Probablility question

If the odds of winning a game are 1 in 10 what are the odds of winning that game three times in a row? Thanks for your help!

• Replies: 0
• Views: 1,035
02-16-2015, 12:45 PM
57. Probability question

For the 1st part of the question do I use Baye's Theorem? e.g. Required probability = 0.25*0.35/= 0.30 - using Baye's Theorem And can anyone...

• Replies: 0
• Views: 1,151
02-16-2015, 07:56 AM

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