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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: 30,320
09-30-2005, 09:44 AM
1. ### P-value from test statistic

I'm given a test-statistic of 2.4 in one of those H0 type problem with a 0.05 significance level. In the z-table, if you look up 2.4, it says 0.0082....

• Replies: 8
• Views: 34,913
01-01-2015, 10:33 PM
2. ### HELP! probability that a 7 digit number is divisible by 7?

The seven digits {1; 2; 3; 4; 5; 6; 7} are written down in a random order. What is the chance that the resulting number is divisible by 7? For...

• Replies: 8
• Views: 3,300
09-26-2013, 09:42 PM
3. ### A Box containing coins question

If a box contains 4 pennies, 4 nickels, 4 dimes and 2 coins are selected at random WITH replacement and D (>=0) is the numerical difference between...

• Replies: 8
• Views: 2,162
11-25-2013, 04:37 PM
4. ### Probability GIVEN I already know some event has occurred

I ask 14 people to buy something, 2 say yes, 12 say no. Given this happened, what is the probability that the next person I ask will buy...

• Replies: 8
• Views: 1,918
01-23-2014, 02:23 AM
5. ### Throwing a ball

Imagine a game where you throw a ball in to a box where are three sticks; the probability of the ball to throw down one stick is 75%, two sticks is...

• Replies: 8
• Views: 2,230
01-11-2014, 04:18 AM
6. ### Probability in an "on-off" cycle

A process runs in a cycle and has a wait time prior to and then after a period of activity. So say at time = 0 the process is "off" for a count of...

• Replies: 8
• Views: 2,016
05-03-2014, 10:43 AM
7. ### Prove that the SD of an asymmetric function is larger than the SD of a symmetric one

How can I prove that the standard deviation of an asymmetric function (mean>median>mode) is larger than the standard deviation of a symmetric one...

• Replies: 8
• Views: 1,704
06-06-2014, 01:02 AM
8. ### Statistically different tops for 2 parabolas with non-normal distributed data

For situation 1 and 2 from my data came two parabola relations between variables X and Y. (the two parabolas have both a maximum) My question is...

• Replies: 8
• Views: 1,596
08-08-2014, 11:20 AM
9. ### Set Completion Problem for a Set of Collectable Objects

I'm trying to do some probability analysis for a digital collectable game called SolForge. There is a particular point in my analysis where I'm not...

• Replies: 8
• Views: 2,806
BGM
08-10-2014, 05:09 AM

Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that...

• Replies: 8
• Views: 2,610
10-12-2014, 11:19 AM
11. ### Probabilities and Monte-Carlo simulations - How to rank?

I'm not that statistically clued up within this particular area but it's an issue I am facing for work (bizarrely) and am having trouble of working...

• Replies: 8
• Views: 2,569
04-28-2015, 10:45 AM
12. ### A bet between a buddy and I regarding the lottery

Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

• Replies: 8
• Views: 1,893
09-08-2015, 11:23 AM
13. ### Estimating probability of malignancy in skin moles

If a certain type of skin mole has 1% probability of malignant change over a lifetime, what is the probability of malignant change if a person has...

• Replies: 8
• Views: 1,632
02-17-2016, 04:38 PM
14. ### Simple but annoying probability question

A, B and C are in three way race - If the probability of A beating B is p, and the probability of A beating C is q, what is the probability of A...

• Replies: 8
• Views: 3,620
12-12-2016, 01:57 AM
15. ### probability help

I'm not looking for simply the answer but i need to know the step by step solution process, and what formula you used if any to solve for it please....

• Replies: 7
• Views: 5,146
09-18-2005, 11:18 AM
16. ### two way tables

Maybe there is no way to do this on this format. However, I am a bit stuck on a question about showing proportions on a two way table....probably...

• Replies: 7
• Views: 4,364
11-06-2005, 04:51 PM
17. ### 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: 3,887
11-28-2005, 11:35 PM
18. ### Stats help Please!!!!

This problem is driving me crazy! The length of time to complete a door assembly on an automobile factory assembly line is normally distributed...

• Replies: 7
• Views: 17,751
12-18-2005, 01:56 PM
19. ### finding probability

According to the Bureau of Navel Standards, 75 percent of all people are "inners," (that is their belly buttons poke inward); everyone else is an...

• Replies: 7
• Views: 5,168
04-27-2006, 01:03 PM
20. ### finding non-randomness in binomial successes?

Hi, I've only had one semester of Stats, so this is probably a real newbie question. I'm having problems on deciding how to approach a specific...

• Replies: 7
• Views: 3,294
01-04-2006, 08:04 AM
21. ### Newbie needs cheating probability

Hello, I am hoping someone could shed some light on the following problem; I sure hope I explain it well enough. Student A and B are both...

• Replies: 7
• Views: 3,075
heD
02-04-2006, 09:02 PM
22. ### Need Help on Probability Probs.

:confused: I'm having trouble with some problems: 1) Suppose that in a family, the probability of a child having black hair is .45, the...

• Replies: 7
• Views: 3,144
02-09-2008, 11:27 AM
23. ### 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: 2,800
02-23-2006, 11:27 PM
24. ### probability

The attendance at football games at a certain stadium is normally distributed. with a mean of 55,000 and a standard deviation of 4500 A)what is...

• Replies: 7
• Views: 2,797
09-21-2006, 07:43 PM
25. ### standard distribution/probability

Use the standard normal distributin table to find a) P(Z<1.00) B) P(0<Z<1.43)

• Replies: 7
• Views: 2,520
09-07-2006, 12:23 PM
26. ### Geometric probability

How many times would you expect to tosss a balanced coin to obtain the first head? Ok, I have p(y) = q exp (y-1) * p Is q = 1-p? and I'm...

• Replies: 7
• Views: 3,073
09-10-2006, 05:17 PM
27. ### Probability Question

Hi. Can someone point me in the right direction on how to solve this problem: A pair of dice is thrown. Let X be the higher of the two numbers...

• Replies: 7
• Views: 2,864
09-14-2006, 12:43 PM
28. ### Exponential Distribution

I am in a 400 level Probabilities/Stats class at my university and am stuck on a problem relating to exponential distribution. I will list the...

• Replies: 7
• Views: 9,918
10-26-2006, 07:53 PM
29. ### Probability Question

I just handed in a test and I'm wondering if I used the correct formula for the following problem; the problem stated (this is not verbatim), a...

• Replies: 7
• Views: 2,467
11-07-2006, 08:42 AM
30. ### Can you get me started?

A television store owner figures that 45% of the customers entering the store will purchase an ordinary television set, 15% will purchase a plasma...

• Replies: 7
• Views: 5,776
11-09-2006, 07:39 AM
31. ### I Need Help Fast

I HAVE AN EXAM ON WEDNESDAY AND CANNOT FIGURE OUT THESE TWO PROBLEMS FOR THE LIFE OF ME. IS THERE ANY WAY SOMEONE CAN TELL ME HOW TO DO THEM! 1. A...

• Replies: 7
• Views: 3,285
ssd
12-13-2006, 06:26 AM
32. ### Help with these two questions, please? I am confused!

Hello Everyone, These are part of my unit on Binomial and Poisson distributions: 1) The average number of phone inquiries per day at the center...

• Replies: 7
• Views: 2,550
02-27-2008, 09:27 PM
33. ### rock paper scissors vs flipping a quarter

hello everybody. thanks for your reply ahead of time. scenario 2 people 1 time only game of rock paper scissors vs flipping a quarter what are...

• Replies: 7
• Views: 6,076
leo
04-09-2008, 08:46 AM
34. ### "Hepatitis" and "Golf" probabilities.

I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

• Replies: 7
• Views: 6,727
06-01-2008, 06:51 PM
35. ### mixing distributions

Hi there, Suppose I have the following situation (specifically I simulate the following situation): X follows Exponential(lam1) with...

• Replies: 7
• Views: 4,348
01-19-2009, 05:39 AM
36. ### Even Sum Problem

How many subsets of three different integers between 1 and 90 inclusive are there whose sum is an even number?

• Replies: 7
• Views: 3,388
10-09-2008, 08:27 AM
37. ### Conditional Probabillity- Check my work?

Ok the problem goes like this: A small brewery has two bottling machines A & B. Machine A bottles 75% of all their bottles, and B bottles 25%. One...

• Replies: 7
• Views: 3,030
10-13-2008, 04:49 PM
38. ### Derivative help

I am having a problem completing a problem because of derivatives. I complete the work down to the part where I get lnL(theta) =nln(theta)- sum...

• Replies: 7
• Views: 2,703
11-02-2008, 03:59 PM
39. ### 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: 3,819
11-11-2008, 07:39 PM
40. ### Please help me on a really easy probability question -_-

I dont know why I cant get this, i know its not hard. Id really appreciate it if someone could clear this up for me =( If there are 72 multiple...

• Replies: 7
• Views: 2,415
11-11-2008, 12:16 PM
41. ### Strange Random Walk

All, it's been a while since college and I need a bit of help with a (probably simple) question regarding random walks: I would like to prove...

• Replies: 7
• Views: 3,817
01-22-2009, 02:56 PM
42. ### X + a log X, where X~Gamma

Does anybody know anything about the distribution of X + a log X, where X is a gamma distributed random variable and a is constant?

• Replies: 7
• Views: 3,994
02-09-2009, 12:45 PM
43. ### probability homework help PLEASE just a point in direction. no answer needed.

Q4. In a Gallup poll, 47% of the eligible women responding said that they would date a coworker. Suppose 350 employed women were selected at random....

• Replies: 7
• Views: 3,746
05-07-2009, 06:03 AM
44. ### prob of at least 2/phone number problem

Here's an interesting problem I came upon A person wrote a phone number on a note and that was later lost. When he try to recollect, he can...

• Replies: 7
• Views: 4,045
08-11-2009, 08:42 AM
45. ### Poisson counting process problem (not easy)

• Replies: 7
• Views: 3,655
10-18-2009, 10:32 PM
46. ### Poisson process: compute E[N(3) |N(2),N(1)]

note: N(t) is the number of points in and N(t1,t2] is the number of points in (t1,t2]. Let {N(t): t≥0} be a Poisson process of rate 1. Evaluate...

• Replies: 7
• Views: 3,696
12-13-2009, 01:32 AM
47. ### probability problem

Let, X is a random variable with MGF = exp{ 3t + 8t^2}. then P ( -4.84 < X < 9.6) = ? (A) equal to 0.700 (B) equal to 0.925 (C) equal to 0.975...

• Replies: 7
• Views: 3,213
01-27-2010, 07:51 PM
48. ### Probablilty binomial distribution

Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

• Replies: 7
• Views: 4,061
02-01-2010, 03:40 PM
49. ### Odds of birthday on same day

I'm confused about the following... Two people have their birthday on a specific day of the year. Are the odds 1:365 or 1:730 ? :confused: ...

• Replies: 7
• Views: 12,507
02-18-2010, 04:09 PM

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