| Subject | Date Asked | Expert |
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| Probability Distribution | 12/6/2005 | Ellis Godard |
Q: The Nu-Look Car Wash recently opened at a new location where customers leave cars in teh morning and ...
A: Per allexperts guidelines, I don't "do" homework. But I'll partly answer this, because I don't think ...
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| statistics | 11/28/2005 | Ellis Godard |
Q: I am attending Westhampton Beach High School and I am testing the students throughout the district. ...
A: "Successful" has many meanings. Statistical results won't provide 100% confidence, but 95% can ...
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| Hypothesis testing | 11/12/2005 | Ellis Godard |
Q: My test is tomorrow and I'm baffled by this problem in hypothesis testing, mainly because it doesn't ...
A: The standard deviation (sigma for the population, "s" for the sample) would apply only to interval- ...
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| probability | 11/11/2005 | Ellis Godard |
Q: At work, I'm doing audit. I have program Excel to generate random number in order to select which ...
A: He's wrong. It's not statistically impossible. At one extreme, of XXXXXXXXXXYYYYYYYYYY, the Xs are ...
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| Prior expectations | 11/10/2005 | Ellis Godard |
Q: I am having a debate with another prof on some recent research. Could you please comment on the ...
A: That doesn't work. The binomial test using the conservative estimate of 50% red and your sample data ...
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| Regression lines | 11/9/2005 | Ellis Godard |
Q: Hey Ellis, I know you can't answer the question for me, but I'm not ever sure where to begin, so ...
A: Hard for me to say, not knowing what material was covered or what you might be expected to know, but ...
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| Normal Curve Equivalents | 11/4/2005 | Ellis Godard |
Q: What is Normal Curve Equivalents? Thought you might know.. Thanks in advance. Kate
A: It could mean at least two related things. A "table of normal curve equivalents" gives the area ...
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| Normality and ANOVA | 11/4/2005 | Ellis Godard |
Q: I am currently analyzing some data using a one-way ANOVA. One of the assumptions regarding the ...
A: I'm a sociologist, and suspect that such concerns are more common in environmental science (which I ...
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| General Statistics Question | 11/2/2005 | Ellis Godard |
Q: I want to thank you for your reply. Is it possible to express the result with a negative ...
A: The second calculation would be the same as making the denominator in the first formula includes ...
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| Statistics | 10/22/2005 | Ellis Godard |
Q: I'm a grad student at PSU and need some help in proving my device is working properly. Here is a ...
A: It's difficult for me to grasp what you're trying to accomplish, and what your data are intended to ...
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| math/median | 10/13/2005 | Ellis Godard |
Q: I want to know if thes numbers 0,1,1.2,2,3,4,4,5,8,9,11 have a medien of 3,4 or is the medien 4,5 I ...
A: The median is a single number. Some instructors would present the median of {1, 2, 3, 4) as (2,3), ...
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| univariate analysis of variance | 9/26/2005 | Ellis Godard |
Q: I tested to see if there were differences between 7 age groups on a measure using univariate ...
A: Tukey and the other post hoc tests lie slightly outside of my expertise, as they're routinely used ...
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| variables | 9/21/2005 | Ellis Godard |
Q: I'm cofused about continuious and discrete variables. Which would "lenth of a car" fall into? It ...
A: That's the point. If there is no logical limit to the precision, the variable is continuous. Length ...
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| Statistics\Standard Deviation | 9/21/2005 | Ellis Godard |
Q: what happens to the mean and standard deviation when you multiply the data spread? Also, is there ...
A: I'm not sure what you mean by "data spread". The standard deviation is a measure of how "spread out" ...
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| Excel Formulas | 8/24/2005 | Ellis Godard |
Q: I want to thank you for the reply. I do have a follow-up question. Do you know what determines the ...
A: yes. if the distribution is multi-modal, the first of the modes is given. in your bimodal example, ...
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| probability question | 8/18/2005 | Ellis Godard |
Q: Lets say I was playing a game and I had a 1/322 chance to lose, what is the % chance that I have to ...
A: This is outside of my area of expertise, as detailed in my profile. However, this math seems fine, ...
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| Probability | 8/12/2005 | Ellis Godard |
Q: I'm at a loss on how to approach/solve this problem. Any assistance you can give would be ...
A: You're being asked for the p-value that summarizes the area under the curve within the specified ...
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| Averages | 7/29/2005 | Ellis Godard |
Q: I want to thank you for the reply. Does the fraction (1 1/5) need to be converted to a percentage ...
A: The meaning doesn't change. It would be solely a matter of presentation, partly a question of ...
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| Averages | 7/28/2005 | Ellis Godard |
Q: I think that the following is a question related to statistics: What does the answer to the ...
A: You've calculated that the current temp is 120% (1 1/5) of the typical (average for one week) range ...
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| more info on question from this morning | 7/26/2005 | Ellis Godard |
Q: I realized after I sent the question this morning that I left out a important variable. Here is more ...
A: That seems to make some sense, I suppose, although the assumption of uniform distribution seems odd, ...
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| aggregate percentage change | 7/6/2005 | Ellis Godard |
Q: Godard, Thank you for taking the time to answer such questions. Your help and time is very much ...
A: Their 2.2 figure seems odd to me, too. 30 to 27 (million, or anything) is indeed a 10% drop, as you ...
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| stat | 6/26/2005 | Ellis Godard |
Q: if I have the mean and standard deviation only, how do I deetrmine z score and percentages of ...
A: that can't be all that you have. you need need more number: the one that you'll subtract from the ...
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| Probability question | 6/20/2005 | Ellis Godard |
Q: I am having problems with these 2 problems. I am not understanding what it is talking about. 1) An ...
A: 1) This problem is incomplete. You could ignore the 16, and use the 6 and 84 (and three) to figure ...
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| general stats | 6/2/2005 | Ellis Godard |
Q: I have a couple of questions for you. 1)If the sample size increases, what happens to the mean of ...
A: These sound like homework questions, which I generally don't answer, on allexperts guidelines and ...
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| weighted average | 4/12/2005 | Ellis Godard |
Q: I am a Nursing Home Administrator in CT. Upon reviewing last months financials, I noticed I don't ...
A: Well, I'm familiar with bed counts and day counts - among other reasons, my father's a doctor and my ...
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| Representive number of tests | 4/8/2005 | Ellis Godard |
Q: it might be a simple question, but I've already tried to find the right answer and I didn't. I hope ...
A: they almost certainly dont all have the same wavelength. most are probably within some margin of ...
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| Chi Squared problem | 4/3/2005 | Ellis Godard |
Q: I am writing a paper on 2 methods of reducing prevelance of a medical condition. The condition can ...
A: chi square would be highest (and appropriate) when two of the categories (opposite corners) have ...
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| significance values | 4/1/2005 | Ellis Godard |
Q: I have just conducted a multiple regression analysis on a set of data. The p value (significant ...
A: IIRC, the sig level for the constant doesnt have much utility, esp if the range of values on the ...
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| Comparison of frequency statistic? | 3/29/2005 | Ellis Godard |
Q: I have a number of sets of data which indicate the number of occurrences of faults in sets of ...
A: the level of significance for a t-test assess a comparison of the data. the lower its value, the ...
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| t-test interpretation | 3/21/2005 | Ellis Godard |
Q: V. simple when you know the answer I'm analysing the difference in birth weights between male & ...
A: the T value is the estimed number of standard errors between the two (male and female) mean birth ...
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| research analysis | 3/20/2005 | Ellis Godard |
Q: Distance to cover (the independent variable)has 3 possible values: 0m, 2m, and 5m. Does this mean I ...
A: no, my apologies and thanks for the clarification - if there are only 2 variables, and the ...
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| Daily changes in Dow Jones | 3/15/2005 | Ellis Godard |
Q: Is there any statistical significance in small (less than two percent) changes to the Dow Jones ...
A: Statistical significance doesn't really "fit" here. First of all, statistical significance means ...
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| math | 3/3/2005 | Ellis Godard |
Q: sorry i forgot that column: 3/31 - 5/31 85 95 115 130 150 5hi expert i'm sorry to bother you once ...
A: > 3/31 - 5/31 > 85 > 95 > 115 > 130 > 150 > 5 > > 2003 room rates > A Ocean Front - 1 double bed > ...
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| Probability | 3/1/2005 | Ellis Godard |
Q: and each calculated a 95% confidence interval. What is the probability that all 27 confidence ...
A: this is a poorly worded question (and you can tell your instrutor i said so). each 95% confidence ...
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| Statistics | 2/26/2005 | Ellis Godard |
Q: I need a place on the Internet where I could study Statistics the course. My professor uses no books ...
A: feel free to mooch from my course. the lecture notes are online in both PPT and PDF format - look at ...
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| simultaneous equation | 2/26/2005 | Ellis Godard |
Q: can the problem z+y+x=6 2z+y=4 2x+y=8 be solved? ans: z=1 y=2 x=3 ...
A: this isn't a probability or statistics question, so you should really have asked one of the math ...
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| Can you solve this simple question? Difficult for me... | 2/18/2005 | Ellis Godard |
Q: Can you explain how to solve this question? If there is an equation that I can use will be ...
A: there's probably a systematic, formula-driven way to do it, but i dont know what that would be. i'd ...
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| Prabability | 2/16/2005 | Ellis Godard |
Q: What is the probability that I am the sexiest man who ever lived?
A: Equal to the inverse ratio of the square of the probability that the number of grains of sand on ...
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| data displays | 2/15/2005 | Ellis Godard |
Q: How do I make a line graph displaying the data on fish lengths from a trial catch by forestry agents ...
A: Draw a side-to-side line, label points on it from 0 to 130 or so. Identify the midpoints of each ...
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| Dice and Probability | 2/13/2005 | Ellis Godard |
Q: I hope that you can assist me. I have a strategy sports game in which players have a chance to score ...
A: the most likely result of each roll is 7 (8 of 36 possibilities, or 25); then 6 or 8 (5 of 36, ...
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