| Subject | Date Asked | Expert |
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| lotto statistics | 2/3/2007 | Ellis Godard |
Q: I want to know if are there any conclusions that I can arrive by analyzing the lotto games ...
A: No, by definition. If it's truly random, there would be no biases which provide tendencies or ...
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| Classical Variables Sampling Formula for Difference Estimation | 1/11/2007 | Ellis Godard |
Q: As a follow-up, how do I determine which calculator is appropriate? I did search, but none of the ...
A: The calculations don't care whether the data is collected by survey, experiment, inventory, field ...
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| probability in research | 1/5/2007 | Ellis Godard |
Q: Whatis the concept of probability in statistics?
A: That's a small question inviting any of many huge answers. In short, probability refers to some ...
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| choosing statistical tests | 12/18/2006 | Ellis Godard |
Q: I am having trouble understanding the differences between the pooled t-test, 2-sample t-test, and ...
A: The part you mention confusing you is the key element: The basic formula for "t" is rather complex, ...
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| Normal curve | 12/14/2006 | Ellis Godard |
Q: I submitted a question a few days ago and the answer that I got was that you don't do homework ...
A: Please don't take offense. Your initial question sounded like one of the many I get that are clearly ...
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| Topography/geometry | 11/22/2006 | Ellis Godard |
Q: -----Question----- Hi, My question is about a feature of topography. In the UK the Ordnance Survey ...
A: No, uniformity of this kind, where the points are all the same distance from each other, does not ...
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| Population Proportion | 11/21/2006 | Ellis Godard |
Q: My question is in regards to population proportions and sample proportions. I have a bag of m&m's, ...
A: You don't seem to be thinking about what "population proportion" must mean. First, it would deal ...
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| Curves | 11/18/2006 | Ellis Godard |
Q: This might seem a stupid question, but why are some classes graded with a curve? Most students seem ...
A: I suspect that there is no single "real reason". Different instructors use this, or one of several ...
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| Data analysis software | 10/13/2006 | Ellis Godard |
Q: I am a member of a not-for-profit organization that wants to do a survey of its 2,200 members. The ...
A: There are dozens of software programs that could help you "slice and dice" data. A standard ...
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| statistic CI | 10/4/2006 | Ellis Godard |
Q: The link refers to a calculator that calculates whether the difference is statisticly significant or ...
A: Ah, my apologies for misunderstanding. There may be a reason such a calculator is harder to find: ...
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| Probability | 9/27/2006 | David Moran |
Q: Maybe you can help me with this question... 1) Eight out of ten people surveyed prefer to observe ...
A: Basically 4/5 of the people approve so that means out of 10 people, 2 will not approve. Call the ...
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| probability | 9/21/2006 | Ellis Godard |
Q: I have a question regarding probability- this is a real situation. If I have 30,000 customers and I ...
A: If all 250 are from the 30K, and you've contacted a third of the 30K, then chances are that you've ...
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| lottery winner | 9/11/2006 | Ellis Godard |
Q: I have just finished reading about Valerie Wilson (NY State lottery 1 million dollar winner twice, ...
A: Because the laws of probability regard long-term results, not short-term results. Also, those laws ...
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| T test? | 9/5/2006 | Michael Abrams |
Q: Duing a research interview, the Manager told me that activity X was meant to change attitudes & ...
A: If I'm reading your results correctly, they do indeed support the conclusion that the activity ...
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| Mathematical modelling. | 8/31/2006 | Ellis Godard |
Q: I'm supposed to develop a model between to variables and somewhere in the instrucions is stated "to ...
A: In general, I'd suggest at least a decimal place or two; whether you need more than that depends on ...
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| Statistics | 8/31/2006 | Michael Abrams |
Q: How many people must be together at one time so that we have a 50/50 chance any two have the same ...
A: For a group of 23 random people there will be slightly more than an even chance that 2 of them will ...
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| Probabilty | 8/28/2006 | Michael Abrams |
Q: I have the following questions on probability; 1.Each vehicle in Mexico is either a truck,car or ...
A: I believe that the probability that the vehicle is either yellow or a bicycle is greater than ...
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| Possibilities in life | 8/27/2006 | Michael Abrams |
Q: Abrams: How are you? My name is Yan. May I ask a really dumb but confusingIs there a way to ...
A: Yan, I agree with the people who say that you should always focus on the things you love. It's ...
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| Probability | 8/23/2006 | Michael Abrams |
Q: What is the probability that you will be dealt one of each suite in a game of euchre?
A: According to Wikipedia, the Euchre deck is A,K,Q,J,10,9 of all suits, and 5 cards are dealt to each ...
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| Odds | 8/22/2006 | Michael Abrams |
Q: What are the odds of a person (me) correctly predicting the gender of babies before they are born, ...
A: If the birth of male and female babies were exactly equally likely--which they are not, but we can ...
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| family birthdays | 8/20/2006 | Michael Abrams |
Q: My mother was born on December 24, as was I, and as was my first daughter. None were planned ...
A: As the average year contains 365.25 days, the probability of any 3 individuals having the same ...
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| Lottery odds | 8/11/2006 | Ellis Godard |
Q: I had a big argument with the boss today. The odds of winning the lottery when you buy 1 ticket ...
A: You're right; he's wrong. Buying another ticket would give you a second chance ("2 in __" instead of ...
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| regression line significance and transformation of data | 8/10/2006 | Ellis Godard |
Q: I have results on a curve, however the data is in percentages. How can I see and have statisctics ...
A: I need more information to answer this question. I'm not sure what "this data" refers to, or how you ...
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| Probability | 8/8/2006 | Michael Abrams |
Q: I am assisting my son in a statistics for management question. IT asks: The monthly starting ...
A: The required sample size is given by n = (z*sigma/d)^2, where z=the upper (.05/2=).025 tail of ...
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| BINGO cards, combi or permu? | 8/7/2006 | Michael Abrams |
Q: What is the difference between permutation and combination? For example, to know the number of ...
A: The difference between combinations and permutations is that with combinations the ordering is ...
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| statistical analysis | 8/3/2006 | Ellis Godard |
Q: I would klike to ask you the followingI have to compare two set of values (pixels). For each of them ...
A: You have all of the pieces you need, and - a hint - you have some you may not need. Two of them ...
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| Combination | 7/27/2006 | Michael Abrams |
Q: I had this problem on a vacation trip to baja. I met a vendor who sells shell wrist band. He uses ...
A: First, your analysis is not quite correct. In the case of 4 shells, he will need 3 bags to sort the ...
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| Standard deviatrion | 7/27/2006 | Ellis Godard |
Q: What is the significant of a large standard deviation and a small standard deviation? What does ...
A: "Large" and "small" don't mean much, unless you're comparing two distributions of comparable data ...
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| Statistical Data | 7/26/2006 | Michael Abrams |
Q: I'm currently taking my first research and development class and it involves a lot of statistics ...
A: Any set of measurements--discrete or continuous--will have a mean (average value) and a median ...
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| interactions in MR (categorical predictors) | 7/20/2006 | Ellis Godard |
Q: How can we test the interaction effects in MR using SPSS? There is a great amount of wonderful ...
A: Yes, multiplying the two dummies will generate the coefficient for interaction that you need. ...
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| Null hypothesis | 7/10/2006 | Ellis Godard |
Q: While we conduct the hypothesis test, is it necessary that Type-1 error will always be there even if ...
A: The Type-1 will only be there when you reject a true null. But since you never know whether you're ...
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| Stats | 7/8/2006 | Michael Abrams |
Q: A competency test has scores with a mean of 69 and a standard deviation of 4. A histogram data shows ...
A: According to the Empirical Rule, when a distribution is (approximately) normal, (approximately) ...
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| Odds/Probability In a Prize Drawing | 7/7/2006 | Ellis Godard |
Q: First of all, thank you for providing your services. Suppose you are conducting a contest in which ...
A: Yes, they all started with an equal chance. Whether that process is unfair is unclear, since "fair" ...
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| inbound vs outbound | 7/4/2006 | Ellis Godard |
Q: I have historical data for each month since Jan 2005 showing # stock going out of a location(demand) ...
A: You could establish a 95% confidence interval (google for the formula, and you'll probably even find ...
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| Survey sampling numbers | 7/3/2006 | Ellis Godard |
Q: I wish to carry out a management attitude survey on a population of 120 people using a standard ...
A: You can never be assured that the sample is representative of the population. The only way to know ...
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| math problem (private no homework) | 6/26/2006 | Ellis Godard |
Q: ive seen somebody whos said hes got an profit marging with an system on roulette the systems is ...
A: No formula will tell you how many times you'll need to bet, since there's no limit to the number of ...
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| european roulette odds | 6/26/2006 | Bill Kaltenekker |
Q: ive seen somebody whos said hes got an profit marging with an system on roulette the systems is ...
A: Sorry, not a good system. For one you only win the amount of you original bet. Next when you double ...
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| confidence levels | 6/26/2006 | Ellis Godard |
Q: Is there an easy way to explain confidence levels in baby language to a non-math person? Can you ...
A: Not really. But here's a shot: Any data (data points, data set, sample, subset, observations, ...
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| number combinations | 6/18/2006 | Bill Kaltenekker |
Q: i have been trying to find out How many possible differnt ways can a dart player throw a score of ...
A: I have not played darts in years. The outer small rings are double, the inner small ring is tripple ...
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| null and alternative hypotheses | 6/12/2006 | Michael Abrams |
Q: A school psychologist is interested in determining if the current senior class differs significantly ...
A: So you're testing whether the population mean differs from 500 and the population standard deviation ...
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