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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: 30,249
09-30-2005, 09:44 AM
1. ### Can't figure out probability question...

Ok, so I'm completely lost in my Statistics class and I really need help on this problem. I think if I figure this one out, it will help with the...

• Replies: 1
• Views: 14,125
10-20-2009, 10:52 AM
2. ### Can't figure out the correct formula

We do a lot of A/B(/C...) testing on our e-commerce sites. I'm putting together a dashboard to display the results from the testing. But I can't come...

• Replies: 1
• Views: 2,815
11-16-2007, 12:55 PM
3. ### can't figure out the right formula!

Hi everyone, I am taking a stats class and we are currently studying probability. I'm having issues with a question on the sample test as I simply...

• Replies: 3
• Views: 2,804
06-23-2011, 07:12 PM
4. ### Can't justify 'correct' answer

I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

• Replies: 2
• Views: 1,347
07-29-2014, 07:29 PM
5. ### Can't reconcile probability information

Hello there! I'm doing a review course in probability that I thought would be trivial. By and large, I'm not having any difficulty, but one...

• Replies: 2
• Views: 2,398
01-25-2010, 02:41 PM
6. ### Can't seem to figure this one out...

This question must be trickier than I thought: A statistics professor and his wife are planning to take a 2-week vacation in Hawaii, but they...

• Replies: 1
• Views: 5,128
03-02-2010, 02:35 PM
7. ### Can't seem to solve this p(x+y>1)

Given f(x,y) = 3x/2 for 0<x<1 , -x<y<x Find P(x+y>1) .

• Replies: 15
• Views: 5,462
04-01-2012, 07:13 PM
8. ### Can't understand some probability symbols.

For two events, A and B, P(A) =1/2, P(B) =1/3, and P(A �� B) =1/4. Find P(B | A). The symbol where is shows a box here is an upsidedown U. Does...

• Replies: 2
• Views: 21,917
06-17-2007, 01:00 AM
9. ### Can't understand what this question means

Let X and Y have exponential distributions Exp(3) (i.e, with the parameter 3) We assume that X and Y are independent. Let U=x+2Y and V=-x+Y....

• Replies: 5
• Views: 1,982
04-05-2012, 07:23 AM
10. ### candy

A candy store owner has daily demand Y for a certain brand of candy sold from the bulk bins. Suppose the owner will never stock more than one...

• Replies: 5
• Views: 4,658
10-25-2005, 04:51 PM
11. ### Candy Slection

There are five candy bars in a box and one of them is a snickers bar. If two children pick out two candies each what is the chace that I will get the...

• Replies: 7
• Views: 2,794
02-23-2006, 11:27 PM
12. ### 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...

• Replies: 7
• Views: 4,911
10-21-2010, 06:41 AM
13. ### Cant figure out this question

What are moments?

• Replies: 0
• Views: 2,292
10-20-2009, 11:39 PM
14. ### cant tell if i am on right track for this prababilitly hw assigment help would good!

I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one...

• Replies: 2
• Views: 1,538
07-18-2012, 05:32 PM
15. ### Card draw and joint probability

I wonder if I'm overthinking this and want confirmation... I'm in thought about how to apply (1) to find the probability of 2 not independent...

• Replies: 17
• Views: 5,381
08-12-2013, 03:34 PM
16. ### Card Drawing Help!

This is for a project I'm working on involving MtG. It began in a different form from an idea for a program I have, but this particular iteration is...

• Replies: 2
• Views: 1,312
08-16-2012, 01:48 PM
17. ### Card Game Probability Question!

The game is screw your neighbor! Four card players at a table. Two players have 1 chip two players have 2 chips. The player who gets delt the low...

• Replies: 1
• Views: 1,724
07-27-2011, 05:35 PM
18. ### Card guessing problem

I took statistics & probability in college, but, for some reason, I seem to have a mental block on how certain things work. I never know which...

• Replies: 4
• Views: 3,493
05-15-2011, 04:26 AM
19. ### Card Pairs Problem with a Twist (TV Gameshow)

Hi I'm working out a solution for a TV gameshow which leads me to a problem... I'd like to know the probability of finding a pair of cards in the...

• Replies: 0
• Views: 1,514
05-03-2012, 04:50 AM
20. ### Card Prob.

A deck of cards has all the face cards removed - Aces, Kings, Queens, and Jacks. There are 36 left in the deck, if two cards were drawn at the same...

• Replies: 8
• Views: 3,846
06-01-2008, 05:24 PM
21. ### Card Probability

Just want to make sure what im doing is correct. Out of a deck of 52 cards, 12 cards are selected at random w/o replacement, what is the...

• Replies: 3
• Views: 1,484
11-20-2013, 03:57 PM
22. ### Card Probability Problem

I seem to have a brain cramp and need some help. A card is chosen randomly from a standard deck of 52 cards and replaced. On average, how many...

• Replies: 2
• Views: 2,135
09-23-2011, 05:04 PM
23. ### Card Probability Problems

Scenario: If you have a standard deck of 52 cards and you draw 2 of those cards without replacement, what is the probability of: 1) P(getting a...

• Replies: 1
• Views: 684
06-15-2017, 04:59 PM
24. ### Card Problem

Hi everyone, My problem is something like this: I have a deck of cards, without jokers (52 cards total). 30 cards are dealt. What is the...

• Replies: 1
• Views: 1,566
BGM
09-28-2011, 04:27 PM
25. ### Card Problem--(More than meets the eye...hopefully)

Hmm, wondering if anyone can solve this problem, and possibly know which game show it came from: Say that you have 3 cards you can choose from:...

• Replies: 2
• Views: 3,229
12-14-2007, 07:45 PM
26. ### Cards (probability)

What is the chance that the fifth card from the top of the deck will be a heart? Here is my attempt (I think it's outright wrong at the moment......

• Replies: 3
• Views: 1,818
07-10-2012, 05:34 PM
27. ### Care to place a bet? (probability guru needed)

I consider myself pretty good when it comes to math and probabilities, but this has me stumped. It's your lucky day! A man offers you a fair coin...

• Replies: 1
• Views: 2,099
BGM
03-04-2014, 10:14 PM
28. ### Carnival game of Under-Or-Over 7?

I am sorry lmao.

• Replies: 1
• Views: 2,979
11-15-2016, 11:24 AM
29. ### Categorizing a question: binomial OR normal OR normal approx. of binomial.

*************Please ingore this question************ *********It's actually a 'Distribution of the Sample Means' question******* What...

• Replies: 0
• Views: 2,095
02-21-2012, 02:41 PM
30. ### 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: 1,810
09-15-2016, 07:16 AM
31. ### Cauchy-Schwarz inequality: cov(X,Y)]^2 ≤ var(X) var(Y)

Suppose that X andy Y are (scalar) random variables. Show that ^2 ≤ var(X) var(Y). (Cauchy-Schwarz inequality) Sow that equality holds if and...

• Replies: 0
• Views: 17,451
10-10-2009, 06:03 PM
32. ### 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: 1,898
10-03-2008, 12:51 PM
33. ### CDF - Cauchy distribution

Suppose that a particle is fired from the origin in the (x, y)-plane in a straight line in a direction at a random angle theta(the symbol with the...

• Replies: 3
• Views: 7,396
11-01-2010, 05:59 PM
34. ### cdf and pdf

consider the following cumulative distribution function F(x) = 0, x<0 =\frac{x+k}{5}, k\leq x<k+1, k=0,1,2 =1, x\geq3 find P(X=j) for all...

• Replies: 9
• Views: 3,334
BGM
11-01-2010, 12:03 PM
35. ### CDF of a PDF with a negative power

I need to solve the following problem: For a marine hull insurance policy, a claim occurs with probability 0.DD, where DD represents the two...

• Replies: 3
• Views: 2,298
03-04-2017, 12:06 AM
36. ### CDF of difference of chi squared random variables

Hi, I posted this question under "Probability Theory" and got no response. Maybe I'd have better luck here? I'm interested in obtaining a...

• Replies: 1
• Views: 8,624
BGM
11-10-2011, 03:50 PM
37. ### CDF of difference of two independent non-central chi square RVs each 1 d.o.f.

Hi Everyone. I'm glad to have found this forum. This is my first post. I'm interested in obtaining a simple expression (exact or approximate)...

• Replies: 0
• Views: 1,924
rhz
10-28-2011, 02:30 PM
38. ### CDF problem

Problem - Let X be a random variable with c.d.f. F(x). Find the c.d.f. of aX + b first for a > 0, then for a < 0. (for a > 0) F(x) = P(X <= x) ...

• Replies: 8
• Views: 8,073
11-02-2010, 04:24 PM
39. ### CDF question

It is proposed to model the annual salaries X (in \$) paid to people in a particular occupation using the continuous cumulative distribution function:...

• Replies: 2
• Views: 2,097
11-06-2006, 05:49 PM
40. ### Cell phone mean and standard deviation

A recent study "privacy and data management on mobile decies"the pew research center, Showed that 18.6% had their location tracking feature turned...

• Replies: 5
• Views: 2,649
09-29-2012, 03:38 PM
41. ### censored data

You put a simple defect into a car and have six randomly selected auto repair shops from city X look at it, one after the other. All six want to...

• Replies: 2
• Views: 1,626
07-12-2012, 12:28 PM
42. ### Central limit problem

Hi, I've been struggling with the below and have no idea how to tackle it. I've looked at the mgf but this doesn't seem to work out. Intuitively I...

• Replies: 3
• Views: 2,965
08-24-2010, 10:30 AM
43. ### Central Limit Theorem

It has been determined that the average cost to develop a 30 second commericial is 20,000 with a standard deviation of 3000 What is the...

• Replies: 0
• Views: 2,624
09-18-2007, 07:20 AM
44. ### Central Limit Theorem

I have been trying for 3 hours and can not figure out what to do. My teacher included this section and it was not in the textbook. I do not know what...

• Replies: 1
• Views: 3,044
03-15-2009, 01:27 PM
45. ### central limit theorem

The central limit theorem can be used to analyze round-off error. Suppose that the round-off error on one number is represented as a uniform random...

• Replies: 0
• Views: 1,916
10-12-2011, 07:32 PM
46. ### Central Limit Theorem

True or False. According to the Central Limit Theorem, the expected value for a sample mean approaches 0 as the sample size approaches infinity. I...

• Replies: 1
• Views: 2,265
07-01-2013, 07:55 PM
47. ### Central Limit Theorem

If X is a Gamma(n,1). For which values of n we have P(|\frac{X}{n}-1|>0.01)<0.1 If n=n_0 is the first value of n that satisfies the above equation,...

• Replies: 3
• Views: 1,794
12-08-2014, 06:25 AM
48. ### Central limit theorem - Approximation the Sum of Bernoullis to Normal Distribution

Hello, I'm new in this forum and I would like to ask for your help. I have a set of Independent Bernoulli random variables, but they are not...

• Replies: 9
• Views: 2,450
06-19-2013, 02:47 PM
49. ### Central Limit Theorem and Exponential Distribution

Exponential Distribution with lambda = 1/2. Use the central limit theorem to estimate the probability that the average service time of the first n...

• Replies: 1
• Views: 3,882
10-15-2012, 02:33 AM
50. ### central limit theorem basic question

I have a basic question concerning the central limit theorem let the 2 by one vectors x1, x2, ..., xn come from a population with mean μ=' , and...

• Replies: 1
• Views: 2,786
BGM
06-17-2010, 02:47 PM
51. ### Central Limit Theorem Problem

Hey folks, I am working on this problem and found several solutions, but none the same! A business ships its products, variable in weight,...

• Replies: 1
• Views: 1,921
01-26-2013, 12:39 PM
52. ### central limit theorem problem 2, is this right?

Suppose the time in days until a component fails has the gamma distribution with alpha=5 and theta = 1/10. When a component fails, it gets...

• Replies: 0
• Views: 2,327
11-21-2010, 02:54 PM
53. ### central limit theorem question check?

Hi! The question states: "Suppose that, historically, one-third of the graduating seniors at a certain college have two parents who attend the...

• Replies: 0
• Views: 4,662
10-28-2007, 03:06 PM
54. ### central limit theorm help

Z1,Z2,.... are identically independently distributed with uniform distribution . How do i use the central limit theorem to estimate the the...

• Replies: 1
• Views: 2,022
BGM
11-21-2010, 01:51 PM
55. ### central limit theorm problem

Suppose the service time in minutes at a bank has the exponential distribution with lambda = 1/2. Use the central limit theorem to estimate the...

• Replies: 0
• Views: 1,930
11-21-2010, 02:44 PM
56. ### central limit theory question

hi: I have a exam coming up Monday and in reviewing the sample questions, I hit a snag and was looking for some help. The question is as follows:...

• Replies: 1
• Views: 2,476
03-12-2011, 11:30 PM
57. ### Central Limit Theory?

Hi everyone! Here's my problem: In a large population, 12.5% of all individuals have diabetes. (a) Seven of these individuals are sampled at...

• Replies: 7
• Views: 3,880
11-28-2005, 11:35 PM
58. ### Central Limit Thrm / Chebyshev Problem

Suppose the price of a particular stock changes from day to day according to the following model. If Yn is the price of the stock on day n, then Yn =...

• Replies: 3
• Views: 2,337
BGM
05-03-2013, 01:21 AM
59. ### Cereal Prizes

Hi, I'm stumped on a probability question. Here's the situation...a cereal company gives away 3 different prizes in its boxes of cereal, with...

• Replies: 7
• Views: 3,807
11-11-2008, 07:39 PM

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