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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: 17,547
09-30-2005, 10:44 AM
1. ### statistic question help

hello :) really need help with something. If person A makes an event once every 50 days, and person B makes an event once every 30 days (the...

• Replies: 0
• Views: 25
Today, 10:12 AM
2. ### Distribution of X+Y of a bivariate normally distributed (X,Y)

I need to give the distribution of $X+Y$ and $X-Y$ knowing that $(X,Y)$ is bivariate normally distributed with marginal means 1, marginal variances 1...

• Replies: 0
• Views: 92
11-29-2016, 03:48 PM
3. ### Computer game log normally distributed

I'm playing a computer game and I want to boost the high score. I assume that attempts are independent (say, you do not improve by playing), and in...

• Replies: 0
• Views: 47
11-29-2016, 03:45 PM
4. ### 5 letter palindrome

Hello, I need help with these two questions. In a 5 letter word (out of 26): 1) What is the probability that L,E and D won't appear? 2) What...

• Replies: 1
• Views: 115
11-27-2016, 01:10 PM
5. ### S1 Statistics question help! Majorly stuck

Hi I have 3 statistics questions that I would like help with, 1. When Albert eats in a certain restaurant, he always eats either chicken or beef...

• Replies: 0
• Views: 157
11-24-2016, 02:18 PM
6. ### What distribution is better in these situations?

I'm new in statistics and probability and I'm a little lost about what distribution is better in these situations: If a tumor is malignant or...

• Replies: 3
• Views: 185
11-22-2016, 04:40 PM
7. ### Process capability analysis (Individuals)

Good morning, i'm working with data following a normal distribution and my purpose is to estimate the capability of my method by measuring Cp and...

• Replies: 1
• Views: 120
11-21-2016, 08:22 AM
8. ### How to find expectation of continuous random variable using indicator?

Let's take a simple example. X ~ Uniform . We know E(X) is 1 using the standard formula. But how to find this using indicator function?

• Replies: 2
• Views: 192
11-19-2016, 01:36 PM
9. ### Two approaches to the same problem in probability

Hello all I have this question: Two basketball players shoot the ball. The probability of the first one to succeed is 0.8, and the probability...

• Replies: 0
• Views: 109
11-19-2016, 03:01 AM
10. ### Probability from sample and sub-groups

Greetings! I was trying to determine probability of soccer tryout success. In Maryland, there are 5,300 boys in this group. There are 320 teams...

• Replies: 0
• Views: 236
11-15-2016, 01:51 PM
11. ### Carnival game of Under-Or-Over 7?

I am sorry lmao.

• Replies: 1
• Views: 155
11-15-2016, 11:24 AM
12. ### Sudokua problem using related binomial distribution

It is given: If you succeed to solve a Sudoku with probability 0.4 and you try many times, how likely is it that you succeed twice before you...

• Replies: 0
• Views: 109
11-15-2016, 07:51 AM
13. ### The probability that I am missing only one tile

Background I recently became fascinated (really!) in this probability problem. I have done quite a bit of work to figure out the answer...

• Replies: 0
• Views: 94
11-14-2016, 10:38 PM
14. ### Distribution function of an exponential random variable

Let Y ⇠ Exp(2) be the size of an insurance loss. If the insurance company pays min(Y, 4), what is the variance of that payment? I know that lambda...

• Replies: 3
• Views: 144
11-14-2016, 05:41 PM
15. ### Resulting expected value of a bounded exponential pdf

I need to determine the distribution function of an exponential random variable with mean 2, given that its outcome is larger than 2 and give the...

• Replies: 0
• Views: 86
11-14-2016, 01:44 PM
16. ### Probability Question

An ice cream company makes ice cream bars on sticks which sell for 10 cents. Suppose that the company puts a star on every 50th stick; anyone who...

• Replies: 1
• Views: 108
11-14-2016, 08:47 AM
17. ### Probability of observing mean difference/compute ranksum

Hi everyone, would appreciate some help on these three questions. If possible with calculations so that I can understand more easily! Suppose the...

• Replies: 0
• Views: 217
11-10-2016, 03:07 PM
18. ### Ratio of chi squared distribution.

U_1 and U_2 are both \chi^2 distribution with 1 and 2 degrees of freedom respectively. Both U_1 and U_2 are independent. Denote \frac{U_1}{U_2} by X....

• Replies: 1
• Views: 191
11-09-2016, 09:31 AM
19. ### Standard Normal Distribution

Z ~ N(0,1) How to show that Z\stackrel{d}{=} -Z and \frac{Z^2}{2} ~ gamma(\frac{1}{2})? Also how to show that only the standard normal...

• Replies: 4
• Views: 301
11-04-2016, 10:25 AM

Hi everyone, I joined the forum just to ask this question about one issue I'm having with probability. Your help is much appreciated. I already...

• Replies: 0
• Views: 214
11-01-2016, 10:21 PM
21. ### Average Probablities over a quarter

Hi all, I have the following probability data for a medical event, I need to find what was the overall probability for these three month? 1-...

• Replies: 1
• Views: 198
10-31-2016, 02:48 PM
22. ### Roulette Probabilities

Did it wrong... delete

• Replies: 0
• Views: 161
10-30-2016, 07:53 PM
23. ### Probibilities on opening hand at bridge

Hi all bridge lovers! Bridge is a wonderful and very complex card playing game with thousands of books written about it. For those who do not...

• Replies: 0
• Views: 155
10-25-2016, 03:56 PM
24. ### 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: 228
10-22-2016, 12:21 AM
25. ### NFL Win Probabilities

Check out this site that keeps track of all the probabilities of the big NFL stat models: http://trevorbischoff.com/2016-amos-nfl-predictions/

• Replies: 0
• Views: 257
10-19-2016, 05:45 AM
26. ### Definition of random variable with respect to event space

It is given that: We toss two dice with sample space Ω = {(i, j), 1 ≤ i, j ≤ 6} and the σ-algebra is generated by the events Ak = {(i,j) :...

• Replies: 7
• Views: 343
10-18-2016, 08:26 AM
27. ### Conditional Monthly Risk Calibration for a trading model

Hi, I have a trading system with a portfolio of assets (long and shorts) with daily market returns. I want to overlay a risk management to my...

• Replies: 0
• Views: 212
10-13-2016, 01:13 PM
28. ### 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: 231
10-11-2016, 04:57 PM
29. ### Limiting Distribution question

Let X1,......,Xn ~ Uniform (0,1). Let Yn = X bar n ^2. Find the limiting distribution of Yn. We know that whenever a random variable has a...

• Replies: 2
• Views: 332
10-11-2016, 04:38 PM
30. ### 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: 165
10-11-2016, 03:35 PM
31. ### 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: 232
10-10-2016, 08:43 PM
32. ### Travelling

Hi, Still on my quest to sort probabilities problems involving time, I was trying to get help on this: If my car is traveling at 100 km / h in...

• Replies: 2
• Views: 274
10-07-2016, 02:36 AM
33. ### Markov probability and stock return

Suppose I have a stock that in in each timeperiod gives a return depending on the state s. Assume that the process starts in s_1 and gives the return...

• Replies: 0
• Views: 206
10-06-2016, 08:38 AM
34. ### Row problem with mandatory empty seats

Here is the exact question: Suppose that 39 students (you being one of them) are randomly seated in a long row of 120 seats. How likely is it that...

• Replies: 1
• Views: 207
BGM
10-06-2016, 02:25 AM
35. ### "Exploding" Dice Probability (Talk to me like I'm an idiot)

Hi All, First off, let me just start by saying that my mathematical savvy leaves a lot to be desired. I didn't take a lot of math in school, and...

• Replies: 1
• Views: 189
BGM
10-06-2016, 02:04 AM
36. ### Convergence question

X1, X2,.......Xn is a sequence of random variables. Show that Xn converges to b in quadratic mean if and only if The limit (n approaching...

• Replies: 2
• Views: 296
10-05-2016, 09:26 AM
37. ### Racing

Hi all, I need some help with some statistical work: So, I am trying to understand how I can transform time into probability. I have 2...

• Replies: 0
• Views: 159
10-03-2016, 09:48 AM
38. ### Conditional Probability

Hello to everyone. I am new in the forum and in the statistics at all. I have some homework to do and I can't figure it out. I am trying to do those...

• Replies: 4
• Views: 389
10-02-2016, 07:10 AM
39. ### Probability of an attribute in one member of a population

Wondering whether the following can be calculated (or whether more info is needed). Here's the population: A - 224,000,000 (72.5%) B - ...

• Replies: 5
• Views: 373
09-28-2016, 05:03 PM
40. ### MSc Research Probability Survey

Hi all, i'm currently in year 2 of a part-time MSc by research into Causal Bayesian Networks at York university; and as part of the study i'm...

• Replies: 0
• Views: 193
09-28-2016, 02:52 PM
41. ### Chebyshev's Inequality problem

Let X ~ Poisson (lambda). With Chebyshev's Inequality, show that P(X >=2 lambda) <= 1/lambda The way I thought to interpret this theorem was...

• Replies: 9
• Views: 431
09-27-2016, 10:46 PM
42. ### Probability - help working out a betting probability scenario

Need a little help and guidance: Tennis match. Player A to hold serve is 85%, Player B to hold serve is 80%. What is the probability that...

• Replies: 0
• Views: 181
09-26-2016, 10:33 AM
43. ### Probability Questions - Cannot seem to figure out

I have been working on this problem for a few days now and cannot seem to at least find a formula or example in my book that works. Any help would be...

• Replies: 2
• Views: 352
09-24-2016, 11:23 AM
44. ### Have you seen this formula before

'Routine to determine the probability of failure given the mean and standard deviation of the capacity and demand. RMinusQ =...

• Replies: 0
• Views: 222
09-22-2016, 04:13 AM
45. ### This is a work question. Thanks!

I am trying to calculate the chances of the wrong number being put in a box. Lets say I have three boxes out of 25 on an assembly line. Each box will...

• Replies: 2
• Views: 282
09-21-2016, 09:57 AM
46. ### Game Probability Question

Hi, I am playing a game. I win with an 88% chance and lose with 12% probability. If I have won 20 games in a row what is the probabilty that I...

• Replies: 4
• Views: 338
09-19-2016, 12:23 AM
47. ### Categorizing reasons for predictions in a model

Hi. I have built a predictive model using decision trees in SPSS modeller. The model predicts which customers are likely to leave based on...

• Replies: 0
• Views: 262
09-15-2016, 08:16 AM
48. ### Conditioning on more than one event

Lately, I've been studying conditional probability. I'm working with the following theorems: 1. P(A|B)=P(A,B)/P(B) (the comma represents...

• Replies: 4
• Views: 509
09-07-2016, 10:58 PM
49. ### What type of distribution is being described (binomial or poisson)?

hhhhhhhhjjjj

• Replies: 2
• Views: 659
08-26-2016, 08:59 AM
50. ### What would the Null Hypothesis be for predicting sports outcomes?

So I made a program to predict the outcome of baseball games, as either a W or a L for the home team. I want to know if my program and algorithm are...

• Replies: 3
• Views: 423
08-26-2016, 04:07 AM
51. ### Use of Bayes Theorem

Hi, I am new here, thanks for having me. I am not a statistician though I have done a stats course at Uni (a long long time ago!). I am trying to...

• Replies: 0
• Views: 211
08-25-2016, 09:32 PM
52. ### Incidence rate in population and in random sample

How can I anser a question like the following: When the true incidence rate of an event in the population is "X" (say, 12%), how likely is it that...

• Replies: 1
• Views: 213
08-25-2016, 05:16 PM
53. ### conditional probability

For a combined ELISA-Western blot blood test for HIV positive status, the sensitivity P(positive test |HIV) is about 0.999 and the specificity...

• Replies: 2
• Views: 295
08-25-2016, 03:56 PM
54. ### False positives

Hi everyone, This is my first post and had a basic (I think) question. Are false positives by definition a conditional probability? I was...

• Replies: 12
• Views: 740
08-14-2016, 02:38 AM
55. ### Poisson curve for low lambda

Hello, I'm quite new to probability and currently trying to understand the different distributions. I see the Poisson curve is weirdly shaped...

• Replies: 6
• Views: 398
08-12-2016, 11:32 AM

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