| Subject | Date Asked |
|
| probability | 11/16/2009 |
Q: How are you? I know that if there are two events that both have a probability of 0.5, then the ...
A: andres - if the lift for A and B is 2, but for A, B and C it is 4, you can assume that C is somehow ...
|
| probability | 11/15/2009 |
Q: How are you? I know that if there are two events that both have a probability of 0.5, then the ...
A: andres - you are correct that for 3 independent events, each having probability 0.5, the ...
|
| Error analysis in linear regression | 11/15/2009 |
Q: I am preparing for practical round in Physics Olympiad, and now I have problems understanding the ...
A: chen - i am not familiar with ther expression you call delta m. in particular, i have never seen ...
|
| Deciding which statistical test(s) to use | 11/9/2009 |
Q: I have a dataset which contains two variables: observations of precipitation and precipitation as ...
A: steve - your question does seem to involve testing two hypotheses - and i think your formulation of ...
|
| counting statistics | 11/5/2009 |
Q: I have a question about standard deviation of a number. When we plate cells in biology and we decide ...
A: not being a biologist, i do not know what is meant by 'plating cells'. in order to give a cogent ...
|
| New Studentized Range table? | 11/2/2009 |
Q: Good day! I just want to ask if the table used for the Tukey's test which is the studentized range ...
A: mamoy - i haven't heard of 'new studentized range' tables per se. but there is an article that ...
|
| Computing Margin of Error | 11/2/2009 |
Q: This is a follow-up to a previous question for which you helped me, thanks again for that. The ...
A: dave - you are quite correct that the ME should also take into account the population size. the ...
|
| non gaussian distribution | 10/22/2009 |
Q: Just read another article by Nicholas Nasser Taleb about fat tail distributions. I'll just copy and ...
A: mark - the counter-intuitiveness you express about 'rare events' [which are called tail events in ...
|
| non gaussian distribution | 10/21/2009 |
Q: Just read another article by Nicholas Nasser Taleb about fat tail distributions. I'll just copy and ...
A: mark - sorry for the rejection email that went out to you. it was sent inadvertently. the ...
|
| Standard Deviation | 10/16/2009 |
Q: I'm taking a Business Statistics course. I'm trying to understand the concept of standard ...
A: davis - your question is more properly addressed to the instructor of the course you are taking - ...
|
| Countings of a categorical variable at different time points | 10/14/2009 |
Q: Fisher, maybe you can help me with the following data. I´m not sure how to analyze them. Here is ...
A: mara - i have an additional reference for you that may be of help. there is a book called ...
|
| Game odds | 10/9/2009 |
Q: I asked this question earlier today but did not get an answer. Thought I may have not sent it ...
A: ed - i can perhaps give you a push in the right direction to help you with your question. the ...
|
| Polynomial Equations And Method Of Least Squares | 10/5/2009 |
Q: First and foremost I have been out of school awhile and my memory of statistics is hazy at best but ...
A: barry - the attachment did get thru this time round. but unfortunately, it is of such poor quality ...
|
| Probability | 10/2/2009 |
Q: However, I'm 35 years old and looking to broaden my expertise into lean / Six Sigma. One of the ...
A: nathan - you've got a bit of a row to hoe if you want to become better acquainted with 6 sigma and ...
|
| Polynomial Equations And Method Of Least Squares | 10/1/2009 |
Q: First and foremost I have been out of school awhile and my memory of statistics is hazy at best but ...
A: barry - unfortunately, the attachment sent with your question did not seem to get transmitted to ...
|
| Percentages & Statistics | 9/28/2009 |
Q: This is not a homework question! I am just curious to know how to solve this with a somewhat simple ...
A: kenneth - there are lots of curious phenomena that one encounters in the realm of mathematics. for ...
|
| Percentages & Statistics | 9/26/2009 |
Q: This is not a homework question! I am just curious to know how to solve this with a somewhat simple ...
A: kenneth - your question involves simple algebra and is not really a probability question. having ...
|
| Analyzing a survey | 9/20/2009 |
Q: I have a temporary consulting job analyzing the results of a survey taken at a large organization. ...
A: dave - it sounds as though you do have a bit of a challenge facing you - to "just analyze it ...
|
| The statistical significance of a difference of 1.2 years between the UK and US life expectancies? | 9/12/2009 |
Q: Can you help me better understand the following issue? US life expectancy - 78.2 UK life ...
A: randy - there may be no statistical issues involved here. it all depends on how the life expectancy ...
|
| Statistics | 9/12/2009 |
Q: In the results of a research study, an author says that a group of treated patients was more likely ...
A: jeff - the abbreviation O.R. is not standard in statistics, as far as i am aware. it could mean ...
|
| Lotto Probabilities | 9/10/2009 |
Q: When looking at the probability of picking numbers for the lottery is there any statistical ...
A: randall - it makes no difference what system you use to pick numbers from week to week. if you ...
|
| Statistics | 9/7/2009 |
Q: Do you happen to know if there is a excel program that I can use to tell me what numbers come up the ...
A: chris - this is a somewhat outside my area of expertise. but for what it is worth, there is a ...
|
| Exponential Distribution | 9/6/2009 |
Q: I'm taking a course in computer simulation. I have a few questions on exponential distribution. I've ...
A: amril - the standard exponential distribution has the pdf f(x) = exp{-x} for x > 0. this ...
|
| Exponential Distribution | 9/5/2009 |
Q: I'm taking a course in computer simulation. I have a few questions on exponential distribution. I've ...
A: amril - the terms "exponential distribution" and "negative exponential distribution" mean the same ...
|
| lotto probability debate | 9/4/2009 |
Q: I don't play the lotto, but recently there was a MA lotto with a really big payout and two friends ...
A: megan - you are of course quite correct. any particular set of five numbers is as likely to occur ...
|
| F & t tests | 8/17/2009 |
Q: In trying to verify a set of test results using the F & t tests. The F test which checks the ...
A: phil - you have to describe the F-test you are trying to carry out in a context. F-tests are used ...
|
| F & t tests | 8/13/2009 |
Q: In trying to verify a set of test results using the F & t tests. The F test which checks the ...
A: phil - what you point out is that tests based on small samples can have low power (= the chance of ...
|
| Ouija Board Dice Test | 8/13/2009 |
Q: I have a weird question for you. I am trying to come up with a way of testing the validity of an ...
A: jim - your answer is correct if you take the sequence order of the dice into account - as if you ...
|
| Probability at least one of three cards will come out on a three card flop | 8/11/2009 |
Q: I play poker regularly. In Hold'em there is what is called the 'flop', three community cards which ...
A: rick - i understand your question to mean: what is the chance that at least one of the three cards ...
|
| Time series data | 7/29/2009 |
Q: What does it mean to used pooled data to find the average autocorrelation coefficient for sales ...
A: sally - time series is not exactly my thing. but i may be able to nudge you a bit in the right ...
|
| Minimum Sample | 7/27/2009 |
Q: If i have a very large bucket of several thousand balls. All I know is that almost all the balls are ...
A: mike - your question is actually the classic sample survey problem. the balls in the bucket ...
|
| Minimum Sample | 7/27/2009 |
Q: If i have a very large bucket of several thousand balls. All I know is that almost all the balls are ...
A: mike - let's be clear about one thing straightaway: there is no sampling scheme that will allow you ...
|
| Minimum Sample | 7/25/2009 |
Q: If i have a very large bucket of several thousand balls. All I know is that almost all the balls are ...
A: mike - the sort of answer you want is not clear. in particular, the sentence you wrote: "Im ...
|
| probability | 7/22/2009 |
Q: The prize is behind one of three doors and you select door 1 of 3, and are later told that door ...
A: frank - your problem is a classic example of paradoxical probability. it has been discussed by many ...
|
| Calculating the P value | 7/15/2009 |
Q: I usually know how to go about getting the P value but this example threw me off. If I have a random ...
A: one can test that null hypothesis that p = .22, rather than that it is <= .22, of course. but your ...
|
| Calculating the P value | 7/14/2009 |
Q: I usually know how to go about getting the P value but this example threw me off. If I have a random ...
A: one might infer from the word "only" in the question that what is wanted here is a one-sided test, ...
|
| measurement uncertianty | 7/13/2009 |
Q: I need to calculate uncertainty between two sets of values like given below please tell me the ...
A: syed - what you mean by "uncertainty" is unclear. i assume the standard values are fixed - not ...
|
| Mean of medians? | 7/10/2009 |
Q: I've collected some reaction time data (i.e., how many milliseconds it takes to respond to a ...
A: tim - let me be sure i understand your scenario: you have 4 blocks for each of, say n subjects. i ...
|
| combinatoric problem | 7/9/2009 |
Q: You flip a coin 10 times. How many possible outcomes are there if you will not count the outcomes ...
A: samantha - i do not usually answer homework type questions - but your problem is a bit unusual - in ...
|
