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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: 30,168
09-30-2005, 09:44 AM
1. ### Video game equipment

Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

• Replies: 5
• Views: 4,568
05-30-2008, 12:00 AM
2. ### Probability

Question. Need help Please The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it...

• Replies: 5
• Views: 3,724
06-07-2008, 07:31 AM
3. ### Probability and Moment Generating Functions

Hello, I am terrible when it comes to probability and moment generating functions. I missed 2 lectures this week and I am now completely lost on...

• Replies: 5
• Views: 3,580
05-22-2008, 02:43 PM
4. ### Probability Question

Hello, I need help figuring out the results which are based on probability percentages. Let’s say there’s an item which you can brake down into...

• Replies: 5
• Views: 2,662
05-31-2008, 11:32 AM
5. ### sampling normal distributions

Hello everyone, I'm a new member to the forum and just wanted to introduce myself. I also have been trying to figure out a homework question, and am...

• Replies: 5
• Views: 4,264
06-20-2008, 12:25 PM
6. ### nonstandard normal distributions

I am working a problem regarding IQ scores and am having trouble with one of the problems. I've got it figured out how to work other problems but...

• Replies: 5
• Views: 21,004
07-01-2008, 10:15 PM
7. ### Stats probability

A bag initially contained 4 white marbles and 9 black marbles. A marble was drawn and replaced by 2 marbles.. of the opposite colour.. Then...

• Replies: 5
• Views: 3,806
09-02-2008, 09:25 AM
8. ### probability help pugowner

14. A study was made to determine the calories, total fat content and sodium in 54 brands of “veggie” burgers as shown below. < 130...

• Replies: 5
• Views: 2,413
10-04-2008, 05:06 PM
9. ### a defective probability problem

I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

• Replies: 5
• Views: 3,052
10-28-2008, 08:47 AM
10. ### Weird Probability Problem

Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

• Replies: 5
• Views: 6,389
11-01-2008, 03:49 PM
11. ### Selecting K numbers from N=10^L where group of same prefix exists

Hello all, I cannot solve following problem. Lets have a phone numbers of the length L. Number of phone numbers is N=10^L. What is the...

• Replies: 5
• Views: 2,747
10-30-2008, 01:04 PM

I have trouble with the following two questions concerning expectations, can anyone give me a hint? Question 1) Suppose there are k=10 types of...

• Replies: 5
• Views: 3,866
11-13-2008, 03:15 PM
13. ### uniform distribution

A bus travels between Glasgow and Edinburgh, which we suppose are 78km apart. If the bus has a breakdown, the distance from breakdown to Glasgow has...

• Replies: 5
• Views: 4,863
11-26-2008, 09:27 AM
14. ### Match odds versus overall odds of winning in horse racing

The problem I have is as follows. Take a horse race with multiple entrants. Assume that I can accurately assess the probability of horse X...

• Replies: 5
• Views: 10,253
12-10-2008, 02:44 PM
15. ### Chebyshev's theorem and empirical rule

can someone please explain how to do this problem? I am so confused! Assume the distribution of weights of US adults are normally distributed...

• Replies: 5
• Views: 11,029
12-10-2008, 02:04 PM
16. ### bayesian

• Replies: 5
• Views: 3,242
01-16-2009, 12:52 AM
17. ### a short one

Hi guys, I'm new to this forum, and perhaps there already exist an answer to this question. Anyway here I go, I have an assignment in...

• Replies: 5
• Views: 2,388
02-09-2009, 08:01 PM
18. ### can you get probability simply from a percentage?

I have this problem I'm trying to figure out regarding discrete probability distributions. If I have a percentage of either successful or failed...

• Replies: 5
• Views: 4,335
02-14-2009, 10:50 PM
19. ### Urgent Help!!

Good Evening everyone! I am looking for some urgent help on the following questions, so any input would be greatly appreciated. #1. It was...

• Replies: 5
• Views: 2,036
02-19-2009, 09:38 AM
20. ### Binomial

The proportion of individuals who favor Party A in the population is 55%. How large must a sample be in order to ensure that 99% of the sample favors...

• Replies: 5
• Views: 2,961
02-19-2009, 05:40 PM
21. ### Calculating probability of a given student major

First off, this is a homework question. I am completely stuck on this problem and am not sure how to answer the question. We are given a table of...

• Replies: 5
• Views: 3,232
02-21-2009, 09:12 PM
22. ### Probabilities...need help fast

i DONT UNDERSTAND THIS QUESTION.. I MEAN HOW DO I SET THIS UP.. PLEASE HELP ME.. QUESTION.. THE 10YR SURVIVAL RATE FOR BLADDER CANER IS APROX....

• Replies: 5
• Views: 2,135
02-23-2009, 01:12 PM
23. ### Probabilistic Independence

Hi, First time poster. Hopefully I won't break any rules. I'm sure you will let me know if I did. Question: Suppose that two dice are tossed....

• Replies: 5
• Views: 2,568
02-25-2009, 06:35 AM
24. ### Homework help

Hello. I have a minor set back on my homework. So I have a homework problem which states find the probability of the indicated event if...

• Replies: 5
• Views: 19,068
02-26-2009, 11:15 PM
25. ### Mr

Need to simultaneneously compare child-woman ratios of two censuses presented in 2 (4*7) tables;4 educational categories and 7 age-groups. Any...

• Replies: 5
• Views: 2,379
04-01-2009, 04:56 PM
26. ### Probability Functions - Need Help

I need help with a question that involves Calculus. I've been out of school for 12 years and now have jumped back into a stat class with a some...

• Replies: 5
• Views: 2,159
06-11-2009, 10:33 PM
27. ### Probability that one group of successes will be greater than another

So, I'm working on this big old nerdy project, but I haven't got much of a head for statistics. I was wondering if someone would be able to help me....

• Replies: 5
• Views: 4,688
08-26-2009, 11:34 AM
28. ### Binomial random variable question

I have this question that is driving me batty & I cannot figure it out. I'm taking entry level stats online & have driven to the campus a few times...

• Replies: 5
• Views: 5,322
06-16-2009, 09:34 PM
29. ### Baye's Theorem Urn Problem

Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

• Replies: 5
• Views: 5,316
07-11-2009, 10:44 AM
30. ### E(X) < ∞ ? What does it mean?

Let X and Y be random variables, F be a function. I have seen in a variety of contexts that they write "E(X) < ∞". What does it mean? My guess is...

• Replies: 5
• Views: 16,840
07-15-2009, 05:30 PM
31. ### Can ANYONE solve this??????

I am trying to figure out the method I should use to find the probability of picking any rank of cards (Ace through Deuce) from a standard deck of 52...

• Replies: 5
• Views: 3,018
07-20-2009, 01:15 PM
32. ### Standard Deviation

Is it possible to calculate the mean and standard deviation of a normal distributed source population when only a few sample means (of non equal...

• Replies: 5
• Views: 2,743
07-31-2009, 10:24 AM
33. ### Binary Bootstrap

Is it valid to use a bootstrap technique for estimating variance in a binary (yes/no or 1/0) data set? My motivation for doing so is to perform...

• Replies: 5
• Views: 7,373
09-29-2009, 04:01 AM
34. ### Process capability without variability in data?

My company uses Cpk to judge process capability, with a 1.33 Cpk being the acceptable minimum for most processes. In some cases, we do not have...

• Replies: 5
• Views: 7,323
09-11-2009, 06:41 AM
35. ### Birthday Problem

Can anyone help me with these questions? I am new in probability and i even don't know where to start..:( (1)What is the minimum number of people...

• Replies: 5
• Views: 3,746
09-20-2009, 04:57 PM
36. ### confused by normal distributions with variance smaller than 1

Hello, I am currently working with some normal distributions, and got confused by some specific situation where the density function does not look...

• Replies: 5
• Views: 6,665
10-29-2009, 05:30 AM
37. ### Conditioning on Random Variables?

Let T be a constant, and let N be a random variable. Suppose {X_1,X_2,...} are independent, and each X_i follows continuous uniform(0,T)...

• Replies: 5
• Views: 3,327
11-17-2009, 10:50 PM
38. ### Need Help With Joint Density Problem Please!

I got the problem

• Replies: 5
• Views: 4,274
11-26-2009, 10:35 AM
39. ### Poisson Question

Got a question here about an antenna designed to withstand 50mph wind ( 20m abover ground) the 50mph wind occurs once every 30 years on average. What...

• Replies: 5
• Views: 2,677
01-10-2010, 03:50 PM
40. ### Fairly Easy Question - Poisson Distribution

My first post! Anyway I just need a bit of help with a question that I've come across in a textbook which is as follows: Cars arrive at a toll...

• Replies: 5
• Views: 7,367
02-11-2010, 10:48 PM
41. ### least squares

Hi there, The least squares equations are g1=Σ(y-μ)=0 g2=Σx(y-μ)=0 where μ is b0+b1*x. g1 and g2 take a specific value for each pair of...

• Replies: 5
• Views: 3,514
04-20-2010, 09:34 AM
42. ### Probaility of one random value being bigger than the other?

Hi all! Intuition was telling me that probability of one random value being bigger than the other (both values are sampled from same distribution...

• Replies: 5
• Views: 3,342
BGM
04-14-2010, 11:01 PM
43. ### Cumulative combinations

I wish to determine the probability of a team winning AT LEAST eight of its next ten games. I understand that 10C8 will tell me the probability of...

• Replies: 5
• Views: 4,498
07-04-2010, 10:12 AM
44. ### why should the I use a t distribution? (theory question)

Hello I would like some help with the theory behind the t-test. I know how to technically perform a t-test but something in the logic doesn't add...

• Replies: 5
• Views: 7,318
BGM
05-19-2010, 01:15 PM
45. ### Expected number of times until x occurs

Hello all, I am just writing to see if this is right. There are two things that can occur. With a probability 1/a, event y occurs and you get a...

• Replies: 5
• Views: 5,392
BGM
06-10-2010, 10:30 PM
46. ### Minor question on sample sizes

Pardon the double-posting -- I'm not sure what this forum's culture is on creating new threads for new topics, but I tend to try to keep each topic...

• Replies: 5
• Views: 2,547
06-21-2010, 10:33 PM
47. ### Help with a probability problem

You have a deck of 60 cards which contains 4 red and 4 blue cards. You draw 7 cards from the deck, what is the probability that you'll have at least...

• Replies: 5
• Views: 2,953
07-02-2010, 12:02 AM
48. ### Interesting problem

I have a list of 10,000 companies along with their annual revenues. These companies are classified as either small or large (there is a strict...

• Replies: 5
• Views: 3,148
07-02-2010, 10:45 PM
49. ### A probability question

a stick of length 1 is cut twice randomly, probability that 3 segments can form a triangle? x,y, 1-x-y x+y>1-x-y ==> x+y>1/2 1-x-y+x>y ==>...

• Replies: 5
• Views: 3,266
BGM
07-16-2010, 12:01 PM
50. ### Conditional Probability

What is the chance that the seventh card from the top of the deck will be a heart? This question really stumped me. I thought and then divided by...

• Replies: 5
• Views: 4,569
07-11-2010, 02:49 PM
51. ### testing hypotheses

Out of an i.i.d sample, with N = 200, and a sample mean of 7000 and sample variance of 700, how would you answer the following question, At 5%...

• Replies: 5
• Views: 3,269
07-14-2010, 05:20 PM
52. ### Uniform Continuous Probability

Hi all, The question i have has these givens: t = years f(t) = 10(1-5t) for 0=< t =< 1/5 a) What is probability that a machine will last...

• Replies: 5
• Views: 5,148
07-19-2010, 11:18 PM
53. ### equip. failure

A widget fails each month for six months. A fix is then installed. How many months of no failures would need to go by before I can be 95%...

• Replies: 5
• Views: 3,133
07-23-2010, 10:52 AM
54. ### probability ques.

a publishing company holds a sales contest in which the top 6 performers out of 97 sales reps receive prizes ranging from a trip to ireland for the...

• Replies: 5
• Views: 2,466
08-04-2010, 01:32 PM
55. ### Chance level binomial, not 1/n

I have some data which I am going to performed a mixed ANOVA on, however, I think I might need to transform the raw data, but am not sure how to. ...

• Replies: 5
• Views: 3,910
08-10-2010, 09:43 AM

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