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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: 30,311
09-30-2005, 09:44 AM
1. ### Another binomial problem....tell me if I'm heading in the right direction

38% of people in the US have type A+ blood. If you randomly select 5 Americans & ask them their blood type, what is the probability that exactly 3...

• Replies: 3
• Views: 2,150
06-17-2009, 11:54 AM
2. ### 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: 5,358
06-16-2009, 09:34 PM
3. ### Tell me if I'm setting this up correctly please

30% of hospital admissions for diabetic patients are r/t problems w/kidneys. In a sample of 10 diabetic hospital admissions, what is the probability...

• Replies: 1
• Views: 2,301
06-16-2009, 01:24 PM
4. ### Probability That The Number of Successes in Two Series Will Be Equal

Ok, I have one more question. In some ways it is similar to my first question, but in others it is infinitely more complex. You have two data...

• Replies: 1
• Views: 2,167
06-16-2009, 02:32 AM
5. ### probability with reguards to quality control

I am taking an online class to beginner statistics. I need help with what equation to use for this question. The Quality control inspector...

• Replies: 0
• Views: 2,342
SHL
06-15-2009, 03:04 PM

Hello, let X, Y, Z be 3 random variables. how to express the conditional probability P in terms of P and P?

• Replies: 0
• Views: 2,287
06-15-2009, 09:26 AM
7. ### Poisson. Calculate expected frequency problem.

I've decided to brush up on my statistics recently by jumping right in the middle of it, and I landed on the normal distribution. I have this...

• Replies: 4
• Views: 10,350
06-15-2009, 09:07 AM
8. ### Statistical calculators

Do you know a good site with direct and inverse calculator to the Normal and Student's distribution? Thanks. Alicia.

• Replies: 1
• Views: 1,982
06-12-2009, 09:20 PM
9. ### 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: 2,176
06-11-2009, 10:33 PM
10. ### A little help please?

This is the final question from my homework and I have been laboring over it for over an hour without much luck. "A certain type of seed has a...

• Replies: 1
• Views: 1,766
06-11-2009, 10:28 AM
11. ### Adjusted odd ratio interpretation

Hi There, I have a question regarding adjusted ODD RATIO interpretation I am trying to interpret a table of results of logistic regression...

• Replies: 1
• Views: 8,690
06-11-2009, 08:09 AM
12. ### help me in assignment plz

A Professor has taught statistics for 41 years and has kept the scores of every test he has ever given. Every test has been worth 100 points. He is...

• Replies: 2
• Views: 3,171
06-11-2009, 06:02 AM
13. ### PDF/CDF of population proportion when sampling without replacement?

Hi Apologies if this is mathematically trivial, but I'm trying to find the probability density function and cumulative distribution function of...

• Replies: 2
• Views: 4,344
06-10-2009, 11:21 AM
14. ### Chi-Square Test

Hi guys, Was hoping that someone can help me with a Chi-Square test I'm attemtping. I understand the mechanics of the test and how to...

• Replies: 9
• Views: 4,992
06-09-2009, 07:23 AM
15. ### integral of probability density function

Hi, I apologize for the almost certainly stupid question. I'm sure somebody must have asked it before but I have searched and cannot find an...

• Replies: 2
• Views: 5,669
06-08-2009, 04:00 PM
16. ### Probability Question

hi, this is a problem i'm working on which confuses me a bit. In a particular city, airport A handles 50% of all airline traffic, and airports B...

• Replies: 1
• Views: 3,695
06-04-2009, 11:22 PM
17. ### density function

hi, i'm working on a problem that goes like: A fire-detection device uses two temperature-sensitive cells (cell A and cell B) acting independent...

• Replies: 3
• Views: 4,105
06-04-2009, 03:25 AM
18. ### Joint density function and conditional distribution

Need help for my assignment question. I just can't get the answer for this question after hours of trying. Given the joint density function ...

• Replies: 2
• Views: 7,011
06-01-2009, 01:58 AM
19. ### discrete variable measurement

hello, just wondering if you could help me with a problem. I am trying to find a way of measurement to differentiate between the following...

• Replies: 0
• Views: 2,576
05-31-2009, 05:15 PM
20. ### Plz help me in creatin p.d

Consider the population of eight students whose ages are given in the table. Let X denote the age of a randomly selected student. 18 22 22 18 ...

• Replies: 1
• Views: 2,348
05-28-2009, 12:06 PM
21. ### question in generating random numbers

Hi, I have question regarding Linear Congruential Method the cycle occurs when same sequence of numbers repeated. in one of problems I solved,...

• Replies: 2
• Views: 2,639
05-28-2009, 10:40 AM
22. ### Expected values, MGF

I got a couple of exercise questions that a little help would be appreciated. 1.Suppose X and Y discrete RV with following joint PF: Y/X...

• Replies: 3
• Views: 3,087
05-27-2009, 11:27 PM
23. ### Normal Probability Distribution

1. A variable is normally distributed with a standard deviation of 9.3. (a) If a probability of a value being less than 23 is to be set at 0.13,...

• Replies: 1
• Views: 2,891
05-27-2009, 12:01 AM
24. ### Adding squares of dependent random variables

Hi there, I hope someone in this forum can help me with this problem: I am creating a scalar test statistic from a time series of a vector r(t)=...

• Replies: 2
• Views: 2,734
05-26-2009, 01:15 AM
25. ### Binary string probability question

Hi, I'm having trouble figuring out this question. I am quite new to probability at this point. Q: How many binary strings of length 2n have...

• Replies: 1
• Views: 3,442
05-25-2009, 06:08 AM

I don't know how to solve this problem Assume that 20 percent of the 60,000 welfare recipientsin a state were addicted to drugs. Adrug test is...

• Replies: 0
• Views: 2,112
umf
05-19-2009, 10:06 PM
27. ### Help with probability question.

Hello everyone, I am doing a revision for my university statistics exam and I've run into a question I don't how to approach. The question...

• Replies: 0
• Views: 1,960
05-19-2009, 03:38 PM
28. ### uniform distribution

Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of...

• Replies: 0
• Views: 5,527
05-14-2009, 05:09 AM
29. ### random probability

Answer the question, considering an event to be "unusual" if its probability is less than or equal to 0.05. Assume that one student in your class...

• Replies: 0
• Views: 6,249
05-14-2009, 04:56 AM
30. ### binomial distribuion problem

Estimate the indicted probability by using the normal distribution as an approximation to the binomial distribution. In one county, the conviction...

• Replies: 0
• Views: 4,576
05-14-2009, 04:53 AM
31. ### Validity of setting constant to zero

Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? I have been sent a multiple...

• Replies: 3
• Views: 8,377
05-13-2009, 05:32 PM
32. ### Probabilities that are neither disjoint nor independent

Question solved through further independent research; thread may be deleted.

• Replies: 0
• Views: 3,520
jda
05-13-2009, 10:32 AM
33. ### Expected values of bivariate distribution

Hi guy's, To calculate Eor E of a bivariate pdf fXY(xy) Do you treat them seperately ie to calculate E E= \int x f(x,y)dx or to calculate...

• Replies: 2
• Views: 6,055
05-10-2009, 03:58 PM
34. ### 6 digits number

we want to create a 6 digits number from the digits 1-5, and to keep the condition that each of the 5 digits, appear at least once. what is the...

• Replies: 0
• Views: 2,185
05-10-2009, 08:54 AM
35. ### Problem involving Random Variables

Hi there. I'm trying to solve this question since yesterday, but I simply can't get the correct answer. Can someone please help me? Here goes the...

• Replies: 2
• Views: 2,341
05-09-2009, 02:24 PM
36. ### Probability integral transformation

Hey I've got a probably simple question concerning time series analysis but I don't know what I should do::( I did a in-sample estimation of...

• Replies: 0
• Views: 4,529
05-09-2009, 08:58 AM
37. ### Need help on stat, I will compensate

hey guys, I need some tutoring before my stat final next week, the topics include: Inventory models (service levels, quantity discounts,...

• Replies: 0
• Views: 2,543
05-09-2009, 01:23 AM
38. ### How to determine data has Poisson Distribution

Hi there Can some one suggest me how i can determine data has poisson distribution? Actually i want to analyze the relationship between these...

• Replies: 0
• Views: 4,385
05-08-2009, 10:52 PM

what I did so far: mean = 430.066 standard deviation = 257.672 n = 30 X^2 = /o^2 = /300^2 = 21.394 ignore the numbers, I can solve everything...

• Replies: 0
• Views: 2,772
05-07-2009, 03:02 PM
40. ### Measuring product ratings

I have a list of products that have been evaluated by humans in a 3rd party blind study. The products were measured on a scale of 0 - 5 stars. ...

• Replies: 0
• Views: 2,174
05-07-2009, 11:23 AM
41. ### homework help: how do I solve this without standard deviation? hypothesis testing

Q7. Law enforcement officers in a city have claimed that over 40% of all robberies committed by those who have a history of drug abuse and/or alcohol...

• Replies: 0
• Views: 6,489
05-07-2009, 06:48 AM
42. ### 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: 3,745
05-07-2009, 06:03 AM
43. ### Normal distribution question...help

• Replies: 0
• Views: 2,255
05-07-2009, 05:05 AM
44. ### binomial distribution help

hey i just need some help with this question: im confused about the formula. find sigma and mu A)the probability distribution of the # of tails...

• Replies: 1
• Views: 3,781
05-06-2009, 11:51 PM
45. ### For complex questions an easy answer

So I am not gonna ponder you guys with stupid basic stat questions, I would love to but I have a final tomorrow, and I would love if you guys can...

• Replies: 0
• Views: 2,460
05-06-2009, 11:45 AM
46. ### no spade or diamonds when randomly drawing 5 cards homework help

Suppose a five-card poker hand was randomly drawn from a well-shuffled standard deck of 52 cards. a) What is the probability that the hand...

• Replies: 0
• Views: 2,322
05-06-2009, 05:31 AM
47. ### Poisson Distribution Question Help

Hey ppl, Hope u guys can help me with this Q plz. An insurance company is reassessing the risk of flooding. From past records it has...

• Replies: 0
• Views: 2,092
JJC
05-04-2009, 07:28 PM
48. ### die probability

Two fair dices are thrown and you are told that the sum of upturned face is equal to 7.what is the probabilty that neither face os equal to 6??is it...

• Replies: 0
• Views: 1,897
05-04-2009, 05:55 AM
49. ### Poisson

What is bigger and why : P(X>=1), or P(X>=2 | X>=1 ) thanks !

• Replies: 3
• Views: 2,622
05-03-2009, 05:08 AM
50. ### Negative Binomial ?

A box contains 5 electric devices, 2 of them are damaged. We check them randomly each one at a time, until we find out which ones are damaged....

• Replies: 0
• Views: 2,641
05-03-2009, 02:21 AM
51. ### Expected Value Question

Is the expected value of a parabola the y coordinate of it's maximum or minimum multiplied by the x value at that point?

• Replies: 0
• Views: 2,748
05-01-2009, 07:34 PM
52. ### Non-linear function of M i.i.d. r.v.

Hi, I have a hard time with the following problem: I consider a population of M r.v. a_i, i.i.d. I need to study the following r.v. eta defined as...

• Replies: 3
• Views: 2,641
04-30-2009, 05:33 AM
53. ### Trying to predict a trend

The chart below displays what percentage of bankruptcies are filed each year, by region, due to medical costs. If I'm trying to predict how many...

• Replies: 1
• Views: 3,477
04-28-2009, 09:06 PM
54. ### Standard Normal Distribution Chart

Hey guys, first post on the site for me Just wondering how I would go about presenting the probability of a z score from my chart if the z score i...

• Replies: 2
• Views: 2,958
04-28-2009, 01:28 AM
55. ### Possibly a proportions question?

So here's the question, my questions about the quesion and what i did. A professor at a local community college noted that the grades of his...

• Replies: 2
• Views: 3,554
04-28-2009, 01:05 AM
56. ### A problem about poisson process

Hi all, I have a question about the poisson process. Below is the queston: Consider each transition of the poisson process as an event, for...

• Replies: 0
• Views: 2,438
04-26-2009, 04:56 PM

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