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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: 30,304
09-30-2005, 09:44 AM
1. ### Conditional probability...

------- Jose and Jim go duck hunting together. Suppose that Jose hits the target with a probability 0.3 and Jim, independently, with a probability...

• Replies: 1
• Views: 3,672
01-31-2007, 06:17 PM
2. ### Conditional Probability: conditioning on intersection of two events

Hi, I came across the following probability problem at my job, and would really appreciate any pointers. Let's assume that 70% of the visitors to...

• Replies: 1
• Views: 3,042
BGM
04-05-2012, 02:03 PM
3. ### Conditional Probability?

What is the probability on a single roll of a pair of dice, that the sum is 6, given that at least one die came up 1? I'm thinking that there are...

• Replies: 5
• Views: 1,676
04-12-2014, 11:20 PM
4. ### 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
5. ### Conditional Variance

Hi, I have difficulty understanding the definition of conditional variance as: var(X|Y) = E)**2 | Y]. Given the definition of variance of a...

• Replies: 7
• Views: 1,882
12-01-2014, 10:12 AM
6. ### conditional variance problem

hi there, not sure on how to approach this problem. I'm a bit lost. how can I show that a rv y which can be expressed a function of rv x, say...

• Replies: 0
• Views: 1,663
c2q
09-30-2011, 06:51 PM

Hi, I have a problem, I try to solve but still get stuck. Can you please read my solution and point out what my wrong points are? Xn is a...

• Replies: 0
• Views: 2,607
10-22-2006, 04:48 PM
8. ### Conditioning on more than one event

Lately, I've been studying conditional probability. I'm working with the following theorems: 1. P(A|B)=P(A,B)/P(B) (the comma represents...

• Replies: 4
• Views: 1,902
09-07-2016, 09:58 PM
9. ### 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: 3,353
11-17-2009, 10:50 PM
10. ### Condtional Probability

edit: got it.

• Replies: 1
• Views: 1,861
10-23-2010, 10:31 PM
11. ### Confidence Help

I am trying to make some observations from a data set of independent and dependent variables. Using its S and AD Test statistic, the set of natural...

• Replies: 0
• Views: 1,097
07-25-2012, 01:40 PM
12. ### confidence in expected value

Hi, My question is about confidence levels in expected values for a distribution that is being sampled. Assume we have two different probability...

• Replies: 0
• Views: 2,453
06-21-2006, 04:43 AM
13. ### Confidence Interval

Hi all, I am new to this forum and wanted help in calculating Confidence interval (CI) I have 3 possible outcomes with probability of say p1, p2,...

• Replies: 1
• Views: 2,941
BGM
09-24-2010, 03:13 PM
14. ### confidence interval

Hi every one I have problem with this question . please help me if you can A research collected 17 observations of breakdown voltage with...

• Replies: 2
• Views: 1,673
12-30-2012, 05:40 AM
15. ### Confidence Interval and SRS

Another quick question.... Q: Running Red Lights A survey of licensed drivers inquired about running red lights. One question asked "Of...

• Replies: 1
• Views: 16,207
11-14-2005, 09:27 AM
16. ### confidence interval calculator

Hello good people. I have a number of websites and would like to know how confident I can be with my click through rate. (clicks/ impressions) ...

• Replies: 1
• Views: 4,807
BGM
01-13-2011, 01:18 PM
17. ### Confidence interval estimate - distribution binomial, variable when positive

Hi, Here is my situation: I have a sampling of 60 bills on a population of size 2300. On that sampling, 20 have an error, i.e they have been...

• Replies: 2
• Views: 2,948
BGM
11-18-2011, 02:07 AM
18. ### Confidence interval for binary data

Hi, I've got binary data (0 & 1's) which I represent as a average along a variable "speed". E.g. when speed is 5, the data is and I present that by...

• Replies: 0
• Views: 7,584
07-14-2009, 12:03 PM
19. ### Confidence Interval for gamma distribution mean

Hello I have a same problem which has been irritating me for so long now. The internet was no help so I post it here. If any of you guys have any...

• Replies: 3
• Views: 17,007
02-27-2013, 04:07 PM
20. ### Confidence Interval for N Observations?

I have a Statistics/Probability question that isn't homework, but a true life example. Some posters on another messageboard are predicting the...

• Replies: 0
• Views: 2,933
10-29-2007, 10:00 PM
21. ### confidence interval for variance

The provincial sales tax (pst) rate vary from province to province. Six of the rates are shown below. 5% 7% 8% 7% 9% 6% Compute a 95% confidence...

• Replies: 5
• Views: 2,521
11-15-2006, 09:48 AM
22. ### Confidence Interval HELP Plz

Plz Help!!!!!!! I can't figure this out Confidence interval for the population mean: Use of the t distribution A corporation that maintains a...

• Replies: 1
• Views: 5,033
08-21-2007, 11:13 AM
23. ### Confidence Interval homework check if correct

1. 68.6 I did this by solving for x with this equation .004=1.96(.14/sqroot of x) 2.84.72% I found this by finding zscore for 1.43 which was...

• Replies: 5
• Views: 4,466
10-19-2010, 04:56 PM
24. ### Confidence interval, pls help

Hi could i pls get some help with these questions. I dont want the answer. I would be greatful if someone could even tell me what formula i would...

• Replies: 2
• Views: 5,620
11-21-2006, 04:04 PM
25. ### Confidence interval?

I am trying to create intervals in my data such that each interval contains the same number of samples within its bounds. I created a histogram...

• Replies: 3
• Views: 3,918
05-09-2011, 08:49 PM
26. ### Confidence Intervals

Hi there, Can anyone help me with this question regarding confidence intervals? Q: 14.6% of New Zealanders identified with Maori ethnicity. For...

• Replies: 3
• Views: 3,181
09-28-2008, 01:56 PM
27. ### Confidence Intervals

A survey of 64 random sports viewers revealed that 32 of them watched the football game. Construct a 99% confidence interval estimate for the true...

• Replies: 1
• Views: 2,688
11-02-2009, 08:19 PM
28. ### Confidence Intervals

Hi I am new to stats and really spending lots of time on concepts which I can build on, I thought I was fairly comfortable with confidence...

• Replies: 5
• Views: 2,551
12-19-2014, 03:12 AM
29. ### Confidence intervals (or regions?) in an opinion poll analysis

Hi, I have a question about confidence intervals (or regions?) used with opinion poll results. I made a poll with three different possible...

• Replies: 0
• Views: 2,022
04-01-2009, 04:40 AM
30. ### Confidence Intervals 101

Hi guys, I have a simple question - at least for some of you. Why do we substitute 0.25 when determining sample size without any prior estimates?

• Replies: 0
• Views: 2,401
04-20-2009, 09:21 AM
31. ### Confidence intervals for proportions: approximating a discrete distribution with a co

I saw on this website http://onlinestatbook.com/2/estimation/proportion_ci.html The following quote about calculating a CI for a proportion: ...

• Replies: 3
• Views: 1,653
02-16-2016, 03:48 PM
32. ### Confidence Intervals using Most Likely Estimators

I have data that follows an exponential distribution. I need to find a 95% confidence interval of the following (using the MLE function): 1. The...

• Replies: 3
• Views: 1,820
03-18-2012, 03:37 PM
33. ### Confidence intervals?

Hi my questions is this. Using PHstat or by hand set up a 90% confidence interval estimate of the number of days absent. Sample of 25 people....

• Replies: 2
• Views: 3,339
el1
04-18-2008, 08:39 PM
34. ### confidence level

if i have a sample group of 148, and a response rate of 17%, what is my confidence level with the data?!

• Replies: 0
• Views: 3,068
04-29-2007, 03:05 PM
35. ### Confidence levels

Hi, I need to calculate the confidence levels that I have enough staff at any point in time to service up to 6 tills in a supermarket. I have a...

• Replies: 3
• Views: 1,944
03-07-2017, 10:33 PM
36. ### confidence levels on 2d \chi^2 grid, where the minimum \chi^2 is not near 1.

Hallo everybody! I have the following problem: I obtained a 2D grid of reduced \Chi^2 fits, where the the minimum \Chi^2 is far from unit (1)....

• Replies: 0
• Views: 2,185
12-12-2014, 04:38 AM
37. ### Confidence Question?

I have a question related, I think, to "confidence". The problem I have is when people jump to conclusions based on what appears to be a...

• Replies: 4
• Views: 1,574
08-30-2012, 09:12 AM
38. ### Confidense interval for population standard deviation

Here is one I am stuck on...not even sure where to begin. Oh, and it is due in 19 hours ;-) A bank is attempting to improve the perceived customer...

• Replies: 2
• Views: 3,869
07-18-2008, 02:24 PM
39. ### Confirm my results for me

1. The police confiscated 500 tablets suspected to contain ecstasy. A sample of 15 tablets were sent to the laboratory for analysis. After getting...

• Replies: 1
• Views: 1,619
02-14-2013, 02:45 PM
40. ### Confirmation bias.

Hello. I am interested in confirmation bias. Specifically I am interested in when a hypotheses can be said to be no longer confirmation bias. ...

• Replies: 4
• Views: 1,953
07-15-2016, 08:57 AM
41. ### Confirmation: Urgent!

Hey all, I just wrote my final exam and there were a set of questions I'm not sure I answered correctly: A deck of 52 cards is shuffled, then we...

• Replies: 6
• Views: 3,022
02-28-2009, 11:02 PM
42. ### Confirmation?

Just wrote an exam, was able to copy down the questions along with my answers. I don't need you to solve them, but just to clarify some things. 1)...

• Replies: 2
• Views: 2,429
02-13-2009, 10:17 AM
43. ### Confusd on procedure

I have a problem with only the this as a given Find P(Z> -.95). How do I find p...I don't know any other values to plug in or do I just make...

• Replies: 1
• Views: 3,919
11-16-2010, 08:37 PM
44. ### Confused about a question!

I have a question that i'm having a really hard time even starting. The IT department runs 3 redundant computer servers concurrently. For each...

• Replies: 1
• Views: 2,895
03-25-2006, 03:33 PM

Hey all, I'm currently a stats student and i have run into confusion about some questions pertaining to probability. I have attempted the following...

• Replies: 14
• Views: 4,684
01-20-2011, 12:06 PM
46. ### 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: 6,708
10-29-2009, 05:30 AM
47. ### Confused on total probability formula

I am very confused on how to apply the total probability formula. If X and Y are two independent continuous random variables with pdfs g(x) and...

• Replies: 2
• Views: 4,582
09-10-2009, 12:08 PM
48. ### Confused on where to get started

I've already went through the problems of Pr(z>x) but I'm confused on where to get started on this problem. If Pr(Z>Zo)=.5, what is the cutoff...

• Replies: 0
• Views: 2,373
04-04-2011, 07:04 PM
49. ### Confused with the Sampling Distribution of p

Hello all, I really hope that I can get an answer. I've worked the problem out, but I keep going back and forth in my head about the answers....

• Replies: 1
• Views: 2,029
BGM
10-25-2011, 11:29 PM
50. ### Confusing Problem and Need Help!

...........................

• Replies: 0
• Views: 2,566
11-25-2009, 09:27 PM
51. ### Confusing...

Hi,i want to ask.....(let X=sample mean) 1.what is the prob that the sample mean will be smaller then 100 or larger than 50? so my expression is:...

• Replies: 3
• Views: 5,085
12-23-2010, 06:56 AM
52. ### Confusion about binomial and hypergeometric

I have a question. Let's say only 15 out of 50 job candidates can get the job at a company. (30%) Would an individual prefer sampling WITH...

• Replies: 0
• Views: 1,219
03-13-2012, 11:49 PM
53. ### Confusion over Expected Conditional Value

I've recently read that for a random variable X, "the expected value of the negative values of X is the expected value of X conditioned on X being...

• Replies: 0
• Views: 2,809
04-23-2009, 03:05 PM
54. ### Confusion with distributions..

I have the following question and I have no idea how to solve it. 3) The population variance of the distribution for X is 100. Two random samples...

• Replies: 6
• Views: 3,305
BGM
11-09-2011, 02:38 AM
55. ### conjoint analysis

Hi how i can ask for which situation to use conjoint analysis?

• Replies: 3
• Views: 1,044
06-12-2017, 06:56 AM
56. ### Conjunction of n hypothesis

Ciao all, :wave: I have a conjunction of n non-independant hypothesis: h1 and h2 and .... and hn. I want to calculate the probability of...

• Replies: 4
• Views: 3,560
09-16-2007, 09:38 AM
57. ### consectutive wins in 10,000 events

Hello, Thanks in advance for your help. My question is related to probability. I think I know the answer, but I would like confirmation on my...

• Replies: 1
• Views: 2,394
08-13-2007, 03:40 PM
58. ### Consecutive outcomes of events

I am trying to figure out the probability for not having consecutive like outcomes from a large sample and can't figure out where to begin. Say...

• Replies: 1
• Views: 1,955
BGM
07-11-2013, 12:08 AM
59. ### 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: 7,577
09-23-2012, 12:17 PM
60. ### Considerations in taking on a one-time gamble

Assuming I'm risk-neutral, how are they different from taking on repeated gambles?

• Replies: 0
• Views: 2,949
02-18-2010, 04:10 PM

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