| Subject | Date Asked | Expert |
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| stats | 6/11/2006 | Michael Abrams |
Q: im having a hard time understanding how to do these practice problems that my teacher gave out in ...
A: #1 A) We have a small sample (n=8<30), so--if we can assume that the per pupil expenditures came ...
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| World Cup probabilities - a maths problem! | 6/10/2006 | Bill Kaltenekker |
Q: Yes... Poland lost yesterday but the statistical analysis I am working from did not indicate ...
A: To get back to your question. In my answer to your first contact I laid out a calculation based on ...
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| World Cup probabilities - a maths problem! | 6/9/2006 | Bill Kaltenekker |
Q: Bill, for your very full answer. In the light of your response I think maybe I didn't describe what ...
A: Chris: OK, the calculation still works. If you run through the calculations as laid out the worst ...
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| Stats. | 6/7/2006 | Michael Abrams |
Q: Hey hows it going, I am in a intro stats class this summmer, the professor is pretty shitty and cant ...
A: a) To find the proportion that finish in less than 40 minutes, we first find the z-score of 40 ...
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| Bingo probabilities | 6/5/2006 | Bill Kaltenekker |
Q: If I have a card with 15 numbers picked out randomly from 1-25... how do I calculate my chances of ...
A: There are two formulas in statistics that will do this for you. One gives you all the possible ...
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| statistics | 5/26/2006 | Bill Kaltenekker |
Q: Let's say we're organizing 24 of our employees into four teams. How many ways can we arrange them? ...
A: There is a combination formula, C(n,r)= n!/(r!*(n-r)) This will give you the total ...
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| Is figuring out standard deviation the best approach? | 5/25/2006 | Bill Kaltenekker |
Q: I'm a software developer and not a statistician, so I need some help. I have a data set consisting ...
A: I am not at all certain that standard devioation is the right thing to do in this case. Standard ...
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| difference between numbers | 5/20/2006 | Bill Kaltenekker |
Q: you toss two number cubes and determine the difference between the numbers. What is the probability ...
A: I decided a long time ago not to work out homework problems because it really does not help anybody. ...
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| lottery follow up | 5/18/2006 | Bill Kaltenekker |
Q: further to my last question regarding regarding he lottery, does that mean i am equally likely to ...
A: I understand your question better now. Probability is strange. Any set of six numbers is as likely ...
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| lottery probability | 5/17/2006 | Bill Kaltenekker |
Q: if the chance of winning the lottery is about 14m - 1, what are the odds of the numbers being ...
A: There is a huge difference when you consider order instead of random. When the order is included the ...
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| PROBABILITY | 5/14/2006 | Bill Kaltenekker |
Q: A basket contains thirty-six tallies respectively numbered 1 to 36. If any six tallies are to be ...
A: Chikere, Hi: There are two formulas that will help you find the answer. They differ in that in one ...
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| Using ANCOVA | 5/8/2006 | Tom Granoff, Ph.D. |
Q: I am trying to figure out how to use an ANCOVA to determine difference in leaf decompostion rates ...
A: I have some ideas that are longer to explain than an e-mail. Please send me the related info to ...
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| combinations | 5/8/2006 | Bill Kaltenekker |
Q: Can you answer this question? Joe remembered that the three digits in his locker combination were 3, ...
A: Normally I do not answer homework questions mostly because homework is to help you learn and help ...
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| Placement percentile? | 5/7/2006 | Bill Kaltenekker |
Q: I want to know what my average placement percentile is. B y this I mean I want to know how good I ...
A: This is not a probability question but I will tell you what I would do. I would calculate the ...
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| probability | 5/4/2006 | Ellis Godard |
Q: Is this statement true or false, explain In large data sets (1,000 or more values), the mean is ...
A: What about 999 16-year-old girls, and one 80-year-old man? It's possibly closer to true that in ...
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| number of combinations | 4/30/2006 | Bill Kaltenekker |
Q: I will use a bingo card as an example: there are 5 columns B I N G O and 5 spaces in each column ...
A: Cheri: OK, piece of cake. There are couple of formulas one for permutations and another for ...
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| number of combinations | 4/30/2006 | Bill Kaltenekker |
Q: I will use a bingo card as an example: there are 5 columns B I N G O and 5 spaces in each column ...
A: I do not understand the question. Are you asking what the probability is that the same set of ...
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| probability | 4/30/2006 | Bill Kaltenekker |
Q: Two cards are drawn without replacement from a standard deck of 52 cards. What is the probability ...
A: Probabilty is defined as the chances for an event happening divided by the total chances. In your ...
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| Football betting | 4/21/2006 | Bill Kaltenekker |
Q: If i take 25 matches and am going to bet on Home win Away win and Draw in a acumalater, how many ...
A: Lets make it easy. Say you only have three matches. Each match has three choices. Once you pick a ...
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| Stats or Calcs | 4/13/2006 | Tom Granoff, Ph.D. |
Q: What is considered in Math to have a higher degree of complexity: Calculus or Statistics? Thanks in ...
A: Calculus is of a higher degree of complexity. I don't have much of a basis for this answer other ...
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| Citrus consumption in Americans | 4/11/2006 | Ellis Godard |
Q: Here is my question. The average US yearly per capita consumption of citrus is 26.8 pounds. Suppose ...
A: Measure the difference between the presumed population mean (26.8) and the hypothetical value (31) ...
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| Multiple regression in SPSS | 4/6/2006 | Tom Granoff, Ph.D. |
Q: I want to do a multiple regression in SPSS. My question is how do I put in independent categorical ...
A: you use multi-way ANOVA which is found in SPSS under General Linear Model --> Univariate. That ...
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| test for a trend in a histogram | 3/28/2006 | Ellis Godard |
Q: I am looking for a statistical test that can be used on data relating frequency of a specific event ...
A: A number of ordinal measures of assocation - including gamma and somer's d - would take into accoutn ...
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| test on histogram trend | 3/28/2006 | Tom Granoff, Ph.D. |
Q: I am looking for a statistical test that can be used on data relating frequency of a specific event ...
A: A one-sample chi-square test just says that "one or more bins are significantly bigger than one or ...
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| Weighted Averages | 3/21/2006 | Ellis Godard |
Q: The simple average for 5 and 2 is 3.5, (1/2 X 5) + (1/2 X 2) = 5/2 + 2/2 = 7/2 = 3.5. However, if 4 ...
A: It's possible you're confused - or that you've been misled... You can't decide to "prefer" 4 for ...
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| both ways | 3/21/2006 | Ellis Godard |
Q: Greetings, What exactly is a bet "both ways", please? Do you know of any web sites which explain ...
A: If there are two horses (or players, or candidates, or whatever the choice is) and you bet money on ...
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| Point Estimation | 3/4/2006 | Ellis Godard |
Q: Ellis, Working on some statistics here and got the rest of my problems done but this one here has ...
A: If you're asked to provide a point estimate, the answer would be 4.2. There's no other point ...
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| probability? Is anything random? | 3/4/2006 | Ellis Godard |
Q: 1) Is there such a thing as "random," if that means "occurring without cause." If one says that ...
A: 1) I wouldn't say that a uranium atom disintegrates randomly. You might say arbitrarily. Arbitrary ...
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| Statistical Significance | 2/9/2006 | Ellis Godard |
Q: I recently took a psychology test that had the"Results are statistically significant if:" and upon ...
A: I agree with you. Your professor's verbiage is obtuse at best, and distorts what a significance test ...
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| math | 2/2/2006 | Ellis Godard |
Q: i am looking for a good activity to do with and elementary class that has to do with probability or ...
A: if you're willing to convey a relatively advanced (though simplifiable) idea, and give them sugar, ...
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| Probabality | 1/27/2006 | Ellis Godard |
Q: Suppose there are were four numbers, 1, 2, 3, 4. I've pre-picked two numbers, say 1 and 2, and have ...
A: For the first, no. There are 6 possible picks (12, 13, 14, 23, 24, 34). If your friend's guessing at ...
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| Chocolate Taste Test Statistics | 1/26/2006 | Ellis Godard |
Q: I am working on a fifth grade science fair project. I did a taste test to see if people liked ...
A: Either of those could work, but I like the first better - though, for the first, swap the rows and ...
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| statistics vs parameters | 1/26/2006 | Ellis Godard |
Q: I'm confused at the difference between parameters and statistics, could you help me understand? ...
A: A parameter describes a full population (all of the like instances about which you might want to ...
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| Chocolate Taste Test Statistics | 1/25/2006 | Ellis Godard |
Q: I am working on a fifth grade science fair project. I did a taste test to see if people liked ...
A: Fascinating project, Lisa - good luck with it! What seems most interesting to me is that it seems ...
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| Probability and Lottery Numbers | 1/18/2006 | Ellis Godard |
Q: I have a question relating to lottery numbers. Let's say there is a lottery that consists of 7 ...
A: if the lottery is truly random, it doesnt matter. nothing constrains the numbers that will win in ...
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| Statistics Problem | 12/11/2005 | Ellis Godard |
Q: I don't know how to procede with this problem. If you just can show me how to start, I can probably ...
A: I don't "do" homework questions, but will tell you this: You need to calculate a test for a ...
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| Which inferential test? | 12/10/2005 | Ellis Godard |
Q: I am a Junior Psychology student taking a Statistics class for my major. I do not understand the ...
A: Short answer: ANOVA. You want to test to see whether NoDFHD varies by state. the 19 Wisc counties ...
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| poll shows most students... | 12/9/2005 | Ellis Godard |
Q: poll shows most students at a university possess above the average number of legs for a human,how ...
A: Carried to enough decimal places, the average would be less than 2 (1.9999999999999999999999999?), ...
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| calculating p value | 12/8/2005 | Ellis Godard |
Q: I am desperately trying to find out how i can calculate the p value (<0.05) for say any two numbers. ...
A: They've determined that the risk of a type I error (incorrectly rejecting the null hypothesis, that ...
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| Selecting a subject pool? | 12/7/2005 | Ellis Godard |
Q: I am conducting an experiment (or will be) that involves finding the effect of a certain music, ...
A: There are ten major forms of sampling - four probability (random) methods and six non-probability ...
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