1. Announcement:
05-10-2017
Views:
1,834
Page 30 of 91 First ... 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 80 ... Last
Threads 1741 to 1800 of 5449

# 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: 30,221
09-30-2005, 09:44 AM
1. ### probability of spelling mistake

Problem. It is found that a story book containing 200 pages contained on an average 2 spelling mistakes in every 10 pages. What is the probability...

• Replies: 2
• Views: 1,667
10-03-2012, 12:23 PM
2. ### probabilities in lottery

Hi, Just an easy question, suppose I have 12 balls (numbered from 1-12), and I need to draw 2 balls out of the 12. But before doing that, I need...

• Replies: 1
• Views: 1,140
10-03-2012, 06:40 AM
3. ### Conditional probability density function, practical example

Greetings to all the ones who are accepting to help people and greeting to the ones who are browsing in the forum! We have 2 independent random...

• Replies: 2
• Views: 4,823
10-03-2012, 03:07 AM
4. ### Error in Calculating the Variance of X?

Hello, I am solving the following problem: “A Salesman has scheduled two appointments to sell encyclopedias. His first appointment will lead to a...

• Replies: 6
• Views: 2,332
BGM
10-02-2012, 12:57 PM
5. ### Finding probability of left and right handed people

Hello, I am lost on these problems: Assume that 13% of people are left-handed. If we select 10 people at random, answer the following questions: ...

• Replies: 11
• Views: 8,996
10-02-2012, 10:29 AM
6. ### Simple probability question

Hi, I came across this probability question and found it kind of confusing: You shuffle a standard deck of cards and draw 22 cards. Given...

• Replies: 3
• Views: 1,343
10-02-2012, 10:25 AM

Help please! I can't for the life of me even understand how to begin understanding this question. I haven't studied stats in like 6 years and my...

• Replies: 2
• Views: 1,762
10-02-2012, 12:36 AM
8. ### [SOLVED] Pharmacy errors

Hello, I am lost on these questions. Could someone please help me? What is the median number of prescriptions until the pharmacist makes the first...

• Replies: 6
• Views: 2,658
10-01-2012, 11:30 PM
9. ### Finding probability of passing test by guessing

Hello, I am confused about this problem: There are 50 4 choice questions out of which at least 25 must be correct in order to pass. If a student...

• Replies: 2
• Views: 4,722
10-01-2012, 11:23 PM
10. ### Left and right handed seats

I have tried to solve this problem in so many ways by using the binomial and normal distributions, none of which gave me the right answers. Here is...

• Replies: 0
• Views: 1,518
10-01-2012, 06:07 PM
11. ### Aproximate inference about a population/distribution

Hello, I am sorry for how confusing this will be. I was reading a while back about making a determination about the probability of a variable in a...

• Replies: 3
• Views: 1,431
10-01-2012, 03:41 PM
12. ### Q-Q plots

The assupmtion for a paired t-test is that the data follows a normal distribution. Given the 2 samples are before and after in nature do I...

• Replies: 1
• Views: 1,506
09-30-2012, 05:56 PM
13. ### α = 0.05 vs p-value?

So I've got a couple questions on my stats homework as follows: E. Canis infection is a tick-bone disease of dogs that is sometimes contracted by...

• Replies: 4
• Views: 51,911
09-30-2012, 04:51 AM
14. ### Difficulty setting up double integrals for Joint Distributions

I'm struggling to set up the correct range when calculating probabilities of joint distributions....anyone have any recommended reading or sites that...

• Replies: 16
• Views: 8,975
09-30-2012, 03:24 AM
15. ### Poisson Distribution question Help

A Black mesh landscaping material is used to put over the ground and prevent weeds. Mulch is usually placed on top. There is on sale at a reduced...

• Replies: 1
• Views: 1,058
09-29-2012, 09:42 PM
16. ### Probability, American airlines!

North American Airlines, on average, delivers three quarters of their flights to the arrival gate within 15 minutes of schedule in august 2012. ...

• Replies: 5
• Views: 1,785
09-29-2012, 04:49 PM
17. ### I'm confused about use of a Complement in determining binomial probability

Hi, I'm working on some homework dealing with binomial probability of inequalities. The problem which has caused me some confusion is stated as...

• Replies: 1
• Views: 1,835
BGM
09-29-2012, 04:39 PM
18. ### 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: 2,645
09-29-2012, 03:38 PM
19. ### Probability help solving problem

A hopeful TV Talent Show contestant claims to be able to predict the result of tossing a coin. To check this out, a fair coin is flipped 24 times,...

• Replies: 8
• Views: 2,145
09-29-2012, 02:24 PM
20. ### Probability Assignment Help!

Q5) Your friend wants to play a game with you. You don't need pay anything to start the game. There is a box contain 20 balls. 10 are red and 10 are...

• Replies: 3
• Views: 1,482
09-27-2012, 04:49 PM
21. ### Simple question about law of total prob. (multivariable)

So I know that a joint distribution of 2 variables x1,x2 can be written as f(x1,x2) = f(x1)f(x2|x1) but what would happen if I have x1....xn...

• Replies: 3
• Views: 1,236
09-26-2012, 05:04 PM
22. ### Find Densities for Exponential Distribution

I am given a general problem: Suppose that X1, ..., Xn is a sample from the Exponential(theta) distribution. Find the densities fx(1) and fx(n). ...

• Replies: 9
• Views: 2,201
09-26-2012, 02:35 PM
23. ### probablility of a sampling giving a results

Let's say I know the mean value of a population I do I calculcate the the probablity to find a different value for the mean after x amount of...

• Replies: 10
• Views: 2,169
09-26-2012, 11:09 AM
24. ### Prove binomial from Multinomial

Suppose that (X1,X2,X3) ~ Multinomial(n,Theta1,Theta2,Theta3). Propve by summing the joint probability function that X1 ~ Binomial(n,Theta1). I...

• Replies: 1
• Views: 1,611
09-25-2012, 08:22 PM
25. ### Predicting the chance of attendance for a given appointment time

Hi I do work for a health screening programme that screens hundreds of thousands of diabetic patients every year to try to prevent blindness. ...

• Replies: 6
• Views: 2,256
09-25-2012, 02:57 PM
26. ### 2 statistical bioresearch problems

Hello guys, I require your help in my research project. Problem 1: We are filtering a suspension of 1ml containing 1250 cells, through a...

• Replies: 11
• Views: 2,769
09-25-2012, 02:54 PM
27. ### 50-50 or just abusing the game?

Hi my name is Oscar and I had a question that has been bugging me and some other friends. We cannot wrap our heads around something and we have our...

• Replies: 9
• Views: 2,214
09-25-2012, 02:12 PM
28. ### Joint and conditional probability distributions and calculations

Hi, I'm new when it comes to joint and conditional probability distributions and would be glad if someone could give me some hints on a problem. ...

• Replies: 4
• Views: 1,294
09-25-2012, 10:46 AM
29. ### HELP! Multinomial coefficient

Q1) Use the multinomial theorem to expand the following: 〖(x^1+x^2+x^3+x^4+x^5)〗^3 How to solve this using multinomial theorem in EXCEL! If...

• Replies: 1
• Views: 1,697
09-25-2012, 05:02 AM
30. ### Find the cdf of a joint density of RV's

This is a homework problem.... Joint density of RV X,Y is: f(x,y) = 2e^-(x+y) if 0<x<y; y >0 and 0 otherwise. Find the cdf of Z = X + Y:...

• Replies: 0
• Views: 1,417
09-25-2012, 01:58 AM
31. ### Random Variables Continuous --- Prove that Fx,y(x,y) <= min(Fx(X), Fy(y))

My instructor gave me a hint of the following: A = ; B = ; then the joint cdf satisfies F(x,y) = P = P (A Intersect B) I'm not wrapping my...

• Replies: 4
• Views: 1,850
09-24-2012, 08:16 PM
32. ### Consequences of choosing the wrong likelihood function...

hey everyone! just a quicky-quick question here. i think i remember reading somewhere that some of the nice properties of parameter estimates...

• Replies: 26
• Views: 7,538
09-23-2012, 12:17 PM
33. ### Simple Probability problem

Hello, First time user, long time visitor. I am hoping someone can and is willing to help me. I am stuck on this two part problem. It seems...

• Replies: 3
• Views: 2,181
09-23-2012, 11:49 AM
34. ### Probability question(Dumplings!!)

I have another one. Just wanna see if im doing it rght. At a large Dim Sum restaurant they continually bring carts around with different dim sum...

• Replies: 2
• Views: 1,581
09-22-2012, 08:24 PM
35. ### [SOLVED] Probability problem help(how to do)

A gardener has a bag with 12 wildflower seeds saved from wildflowers in summer. She plants 4 of them at random in a pot to see if they will grow...

• Replies: 15
• Views: 3,247
09-22-2012, 08:21 PM
36. ### Probability question!(help on solving!)

A group of 5 co-workers, Tim, Harry, Nina, Brad and Pam contributed to buy a raffle tickets. They won a set of three tickets to an upcoming concert....

• Replies: 1
• Views: 1,386
09-22-2012, 06:45 PM
37. ### Bernoulli Random variable and population problems - i need it for an exam

Let Ya and Yb denote Bernoulli random variables from 2 different populations, denoted a and b. suppose that E (Ya)= Pa and E (Yb) = Pb. A random...

• Replies: 1
• Views: 3,731
09-22-2012, 03:34 PM
38. ### judges

A panel of judges is comprised of 5 women and 3 men. On a particular ruling, the 5 women voted in favor of the defendant and the 3 men voted against...

• Replies: 2
• Views: 1,521
09-21-2012, 05:28 PM
39. ### Sampling w/out Replacement problem

I can solve with replacement, but without has me stumped: So there's a bag with 100 nuts in it. 20 walnuts 30 macadamias 50 cashews If...

• Replies: 3
• Views: 1,356
BGM
09-21-2012, 01:32 PM
40. ### Standard normal distribution

Can someone please help me answer this Q with workings so I learn? Using a survey in winter 2009, it was estimated only 1% of households have...

• Replies: 4
• Views: 1,499
09-20-2012, 10:29 PM
41. ### A question about the distribution of random numbers - PART II

Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The...

• Replies: 7
• Views: 1,543
09-20-2012, 05:12 PM
42. ### Probability of an event after combining (Union) two sample spaces

Can anybody help me how to solve the following problem. Suppose we have an event x and two sample spaces s1,s2. let the probability of x is 0.3, 0.4...

• Replies: 9
• Views: 5,321
ahb
09-20-2012, 01:25 AM
43. ### Probability of multiple tags on a sea turtles pinging within an hour

There are 7 sea turtles each with a pinging tag on it. Turtle 1: 52% of an hour tag is pinging Turtle 2: 52% of an hour tag is pinging Turtle 3:...

• Replies: 2
• Views: 1,724
09-18-2012, 02:39 PM
44. ### Probability of scrabble game based on scores

How do i calculate the probability in a scrabble game based on scores. Lets say Player A has 42 score and Player B has 90. How do i calculate the...

• Replies: 1
• Views: 1,416
09-18-2012, 01:54 PM
45. ### model conversion events

When a web site visitor purchase a product, this event is called a conversion. I would like to know how to model such conversion events. What methods...

• Replies: 1
• Views: 1,249
09-18-2012, 10:23 AM
46. ### Conditional probability question

Hi there, I have the journey times of 2 journeys. Would somebody be able to show me by way of example how to calculate the conditional...

• Replies: 0
• Views: 975
09-18-2012, 09:26 AM
47. ### Game Theory Question

Hello gurus, I got involved in a debate with my sister this evening, and despite (what I thought) was a relatively simple problem, I couldn't...

• Replies: 2
• Views: 1,599
09-17-2012, 10:37 PM
48. ### Question

The terms "at least" as well as "or" I know they have their roles to play. Or means, "either one or the other, or both" And the term "At Least"...

• Replies: 2
• Views: 1,193
BGM
09-17-2012, 01:04 AM
49. ### Intro to Probability question!

Let C1 & C2 be independent events with P(C1) = 0.6 & P(C2) = 0.3 Compute P(C1 U C2complement) :wave: thank you!

• Replies: 1
• Views: 1,381
09-15-2012, 09:08 PM
50. ### Solving for a RV as a function of iid RVs

Hi folks, I'm not a probability theory guy (economics PhD student), but I've recently gotten interested in networks and I've set up a model that I...

• Replies: 1
• Views: 1,958
09-15-2012, 03:08 AM
51. ### Interesting ways to generate a random normal deviate

I was thinking of ways to generate a random normal observation from a single random uniform(0,1) observation. I have at least 3 interesting ways in...

• Replies: 1
• Views: 2,134
09-15-2012, 02:41 AM
52. ### Inequalities between random variables

Hi guys, I have the following question: Assuming that X and Y are two independent discrete random variables and Pr(X <= Y) is known how easily...

• Replies: 2
• Views: 2,352
09-15-2012, 02:11 AM
53. ### Question on independance

I am having trouble understanding independence. I understand the basic formulas, but I had some additional questions: -Can you have you apply the...

• Replies: 1
• Views: 1,189
BGM
09-14-2012, 03:50 AM
54. ### Bayes theory interview question.

This question is a typical interview question at a job I am currently seeking. The reason I am posting it is I have had different answers from...

• Replies: 3
• Views: 7,509
09-12-2012, 08:45 PM

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.