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Probability & Statistics/Questions
| Subject | Date Asked | Expert |
| Probabilities | 2/8/2005 | Ellis Godard |
| Q: When flipping a coin, the probability of getting tails is 50%. I want to know the following: If I ... A: Two questions... first, check the cell format and make sure that decimal places are showing or that ... | ||
| Statistics and Probability | 2/6/2005 | Abe Mantell |
| Q: I have two questions that I just can't solve. Can you help me? Here they are: 1) If a response ... A: 1. Not sure about that one! Sorry! 2. with L=4, we want P(x>6)=1-P(x<=6) -- = 1-[P(x=0)+P(x=1)+ ... | ||
| Probability | 2/1/2005 | Abe Mantell |
| Q: If I drop a piece of paper in a room, it may fall on the fllor and take infinite number of ... A: Very good question! Think of it this way...suppose infinitely many people buy a raffle ticket (with ... | ||
| Probability | 2/1/2005 | Ellis Godard |
| Q: If I drop a piece of paper in a room, it may fall on the fllor and take infinite number of ... A: one position is certain only in a newtonian model, and even then, you would have to know all of the ... | ||
| Hi, Abe! I got a nice question.... | 1/31/2005 | Abe Mantell |
| Q: Abe! I got a nice question. I'd be glad if u could explain this. A TV show game, where are 'prices' ... A: This is the well-known "Monty Hall Problem"!!! Check these links for more on it... ... | ||
| Bar Graphs and Histograms | 1/25/2005 | Abe Mantell |
| Q: (Other than the fact that bar graphs represent qualitative variables and histograms are used to ... A: Sometimes it is not clear when to use which one...so it may not matter too much. But, certainly a ... | ||
| Future Price Projections - Probability Graph | 1/20/2005 | Abe Mantell |
| Q: which said in part; "Yes, what you want to do is construct a 95% confidence interval for linear ... A: Check these sites for nice demos & explanations: http://www.curvefit.com/linear_regression.htm ... | ||
| sampling distr. | 1/18/2005 | Ellis Godard |
| Q: I have a question for you to review for me. Thank you. 1)If we sample n=64 from a population with ... A: you still have the first one wrong, and now it's even more wrong. draw a picture, showing the ... | ||
| correlation | 1/17/2005 | Ellis Godard |
| Q: I'm interested in comparing the correlation of two investment funds, and don't know what measures of ... A: r and r2 ("r-squared") aren't really different calculations - one is simply the square of the other. ... | ||
| Future Price Projections - Probability Graph | 1/17/2005 | Abe Mantell |
| Q: For a series of values, like: Date $Value 31-12-82 57600 31-12-83 60000 31-12-84 61000 ... A: Yes, what you want to do is construct a 95% confidence interval for linear regression. I gather you ... | ||
| sampling distributions | 1/10/2005 | Abe Mantell |
| Q: I have a question for you to review for me.Thanks again. You are extremly helpful with your answers. ... A: No, as n increases the standard error decreases... since it is sigma/sqrt(n)...so as n increases, ... | ||
| mean,median,ect.. | 1/2/2005 | Abe Mantell |
| Q: I want for you to explame the terms of mean,median,mode,and range A: Mean - is the average...just add the numbers and divide by how many numbers you have. Median - is ... | ||
| Question | 1/1/2005 | Abe Mantell |
| Q: Sir, I have a question. Please give me some potential comments with the help of examples. The ... A: Here are some web-sites that will help: ... | ||
| correlation significance | 12/20/2004 | Ellis Godard |
| Q: I am comparing various investment funds and am looking at correlation data from fund to fund, fund ... A: Standards like this are often given in three stages - weak, moderate, and strong. For Pearson's ... | ||
| stats | 12/13/2004 | Ellis Godard |
| Q: I saw where I made my mistake.You must have been a good teacher.I am having trouble with this group ... A: :) 1) correct 2) try again - the frequencies for 13, 14, 15, and 16 should be added 3) close - you ... | ||
| stats | 12/8/2004 | Ellis Godard |
| Q: I have some reveiw questions that I would like you to check for me. 1)The VARIANCE and the RANGE are ... A: I got 6 for #5, too. But I got 14 for #3... First, find the mean: (32 + 34 + 36 + 38 + 40 + 42)/6 = ... | ||
| using 2 test Pearson and Chi Sq | 12/5/2004 | Ellis Godard |
| Q: ------------------------- When is it useful to test with BOTH Chi-Square & Pearson's Corrleation? ... A: Perhaps never. Pearson's chi-square statistic compares observed and expected frequencies for ... | ||
| research statistics? | 11/17/2004 | Ellis Godard |
| Q: What's those r and p symbolize whenever research results are shown? What's the purpose and formula ... A: P is the probability value, the risk of being wrong if you rejected the null hypothesis (of no ... | ||
| Random numbers | 11/15/2004 | Ellis Godard |
| Q: I am trying to write a computer program that uses a random number generator. The literature says ... A: Use a random number generator written as whatever language your using allows. Then multiply the ... | ||
| Possible pemutations | 11/10/2004 | Ellis Godard |
| Q: Ellis, Sorry for not being clear. It's like a chess board for instance and each counter a pawn. ... A: Combinatorics of this sort aren't really my thing, but... instead of allocating counters to spaces, ... | ||
| Permutation and combination? | 11/8/2004 | Ellis Godard |
| Q: I need to ask your help regarding a solution to probability. There are 4 numbers 1 , 2, 3 and 4. ... A: 12x11x10x9 doesnt make sense to me, unless one works with a larger formula that first calculates the ... | ||
| standard deviation | 11/3/2004 | Ellis Godard |
| Q: Can you please explain what standard deviation is and how it is used in the processing of results/ ... A: The standard deviation measures how much each reading differs from the mean (mathematic average) of ... | ||
| anonymous | 11/1/2004 | Ellis Godard |
| Q: I can usually solve an equation with one variable, for example 8 = 3x + x, where x equals 2, but how ... A: Such equations are "solvable" not by a single pair of values, but by a set of pairs. This set of ... | ||
| Stats | 10/30/2004 | Ellis Godard |
| Q: Ellis I am confused about 3 things (probably more!) (i) the critical level C e.g ...reject the ... A: Hang in there, we'll figure it out. It's possible the course is challenging, and that you've ... | ||
| Chi-squared goodness of fit test | 10/22/2004 | Ellis Godard |
| Q: I'm doing an A-level statistics project. I want to test whether a frequency distribution i have is ... A: In a normal distribution, 68.26% of cases fall within one standard deviation of the mean (Y-bar plus ... | ||
| Probability Distributions Question | 10/19/2004 | Ellis Godard |
| Q: The scores of an entrance exam are normally distributed with a mean of 550 and a standard deviation ... A: Yes - well done. :) With one corrollary: I usually advise students to use a smaller z and larger ... | ||
| standard multiple regression | 10/16/2004 | Ellis Godard |
| Q: I am actually writing my thesis in psychology and I am looking at predictors of anxiety symptoms in ... A: Three final thoughts: If the other two variables have a joint distortion effect, their interaction ... | ||
| standard multiple regression | 10/16/2004 | Ellis Godard |
| Q: I think I was getting confused between distortion and suppression, but you clarified this :) After ... A: Yes, that sounds correct. It's been some time since I've done much multiple regression, or seen a ... | ||
| standard multiple regression | 10/16/2004 | Ellis Godard |
| Q: I am running a research project in which I am analysing my data using a standard multiple ... A: Reversing the effect is called distortion, not suppression. Suppression is when an effect is found ... | ||
| standard multiple regression | 10/15/2004 | Ellis Godard |
| Q: I am running a research project in which I am analysing my data using a standard multiple ... A: It could be that a combination of two variables is suppressing the original relationship. If so, ... | ||
| Population | 10/10/2004 | Ellis Godard |
| Q: I know that the world population is approximately 6 billion but how can I work out exactly or ... A: That's the subject of much conjecture, and has been since the 1970s. Use any search engine and ... | ||
| stats | 10/8/2004 | Ellis Godard |
| Q: I have a few review sheet questions that I can use your help with. Federal funding to a state's ... A: I'm not comfortable providing answers to these questions outright, since you should be trying to ... | ||
| recusive functions | 10/7/2004 | Ellis Godard |
| Q: This is more of a programming question, but I am trying to calculate a probability. You start with ... A: It's been years since I've programmed something like this, but it's a bit like a bicycle - I can ... | ||
| Probabilities | 10/6/2004 | Ellis Godard |
| Q: I want to know how i can work out probabilities for example, heads and tails a 50% chance of either, ... A: The chances of the outcome (heads or tails) remain 50% on each flip, regardless of what happened on ... | ||
| stats | 10/5/2004 | Ellis Godard |
| Q: Can you give me a simple definition of independent and dependent variables? I am taking a beginning ... A: The independent variable (aka the exogenous variable, though sometimes incorrectly) is the "cause". ... | ||
| Probability Problem | 10/3/2004 | Will Dwinnell |
| Q: I need help with the following problem: Three jars are used in a lottery. Each jar contains ten ... A: Your answer to '1' is correct. I believe you have instead interpreted question 2 as "the ... | ||
| Probability Problem | 10/3/2004 | Ellis Godard |
| Q: I need help with the following problem: Three jars are used in a lottery. Each jar contains ten ... A: 1. right. :) 2. No. Still 1/10=.1, since the event from the second jar is in no way affected or ... | ||
| ANOVA and Normality | 10/1/2004 | Ellis Godard |
| Q: I'm Pietro Cottone, an italian graduate student, and I have got some doubts about ANOVA. In order to ... A: Buon giorno, Pietro! Per favore, pardon il mio monolinguism. La mia moglie è Italiano-Americana, ma ... | ||
| Percentage Points | 9/29/2004 | Ellis Godard |
| Q: Does a percentage point only pertain to percentages, numbers ending with a (%)? 1. For example, 25% ... A: The short answer is yes. "Percentage" means "per cent" or "out of one hundred". The denominator ... | ||
| paired t-test question | 9/28/2004 | Ellis Godard |
| Q: I have a question about the paired t-test: say I measure the blood pressure of a group of patients ... A: I would recommend using the mean (or, if you took MANY measurements before and after, the median) ... | ||
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Ellis Godard
Top Expert on this page
Expertise
I can answer basic and intermediate questions. If I don`t know the answer, I`d be interested to find it for you, or to suggest somewhere you could look.
Experience
I've taught introductory statistics to college students majoring in sociology, psychology, and communications for more than a decade. However, my expertise is with respect to statistics and probability distributions for conventional statistical analyses, NOT with binomial distributions and combinatorial procedures.
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