| Subject | Date Asked | Expert |
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| permutations and combinations | 12/7/2007 | Soroban |
Q: can you explain the difference between permutations and combinations?how will you find out whether a ...
A: Monisha! A permutation is when the order makes a difference. A combination is when the order does ...
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| Probability Help | 12/5/2007 | Soroban |
Q: I just need to know where to start, and the formula, I have similiar questions in my notes but the ...
A: Will! I assume that "between 5 and 7" means: 5, 6, or 7. So we must calculate those three ...
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| probabilty | 12/4/2007 | Soroban |
Q: what is the probability of rolling a double either on the first or second roll with two dice
A: Nikhil! There are 36 possible outcomes with a pair of dice. There are 6 outcomes which are doubles. ...
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| probabilities | 12/2/2007 | Soroban |
Q: A friend who works in a big city owns two cars, one small and one large. Three quarters of the time ...
A: Sally! This is a Conditional Probability problem. We need Bayes' Formula. We're given some ...
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| probabilty | 11/28/2007 | Soroban |
Q: suppose two fair, 6 sided dice are tossed. What is the probability that the sum equals 10 given it ...
A: Nikhil! With a pair of dice, there are no neat formulas. We must list (or visualize) the ...
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| probabilty | 11/28/2007 | Soroban |
Q: A fair six sided die is tossed. What is the probability the first 5 occurs on the fourth roll
A: Nikhil! The probability of a 5 is: P(5) = 1/6 The probability of another number is: P(other) = ...
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| Bingo probability | 11/28/2007 | Soroban |
Q: I person I met the other day runs a type of bingo on a cruise ship and I am wondering what the ...
A: Peter! The game of Bingo does not have any easy answers. I can give one VERY simplified version, ...
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| Probability and Statistics | 11/21/2007 | Soroban |
Q: Women make up 24% of the science and engineering workforce. In a random sample of 400 science & ...
A: J.R.! Who assigned this problem?? The work and the answer is way too long and tedious! Maybe they ...
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| spss data inputting | 11/20/2007 | Ellis Godard |
Q: i would like to analyse some data using spss, however what do i do when there is more than one ...
A: if you're using a relatively recent version, spss will open by default to a spreadsheet window where ...
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| Probability and Statistics | 11/20/2007 | Soroban |
Q: I have this problem I can't seem to figure out: Suppose that a judges's verdict is correct 90% of ...
A: Darrel! We have: P(correct) = 0.90, P(wrong) = 0.10 And we have: 10 trials "Fewer than ...
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| statistics | 11/19/2007 | Soroban |
Q: A probability experiment has two steps. There are two possible results for the first step, call them ...
A: Kate! This is easier than I thought . . . There are only: 3 + 16 = 19 outcomes. I thought it ...
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| Probability | 11/14/2007 | Ellis Godard |
Q: Does it make real sense to calculate the probability of a completed event? If one out of 12 women ...
A: This question is partly philosophical, rather than statistical, although there may be an empirical ...
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| Lottery Probability Question | 11/8/2007 | Soroban |
Q: My son has these series of questions given to him as homework in his 4th grade math class. The ...
A: Sha Coda! Yes, you got part (A) correct. Those are the primes among the numbers from 1 to 49. (B) ...
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| probability queswtion help | 11/6/2007 | Soroban |
Q: i have this problem, and im not understanding it very well. there are 128 students in a class, 28 ...
A: Ryan! There are a number of ways to solve this problem. I'll give you the simplest method. There ...
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| Probability | 10/28/2007 | Soroban |
Q: A box contains seven red and 13 blue balls. Two balls are selected at random and are discarded ...
A: Ben! This is a Conditional Probability problem. You're expected to know the formula for it. ...
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| Statistics - Poker | 10/23/2007 | Soroban |
Q: I have another one that I think I am on the right track with but wanted to make sure... In 5 card ...
A: Erica! Your reasoning is correct ... but incomplete. A ten-high straight would be: 6-7-8-9-10 ...
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| Statistics - Independence | 10/23/2007 | Soroban |
Q: I am having trouble with the following problem: Two pumps connected in parallel fail independently ...
A: Erica! The keyword is "independent". We are given that: P(old fails) = 0.10 P(new fails) = ...
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| regression lines | 10/21/2007 | Ellis Godard |
Q: there are two regression lines ,why?
A: There are an infinite number of regression lines - at least two for every equation. One represents ...
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| pl. reply to this question as soon as possible | 10/19/2007 | Soroban |
Q: If a gathering of 1000 people everyone shakes hand with everyone else once then how many hand shakes ...
A: gurpreet! We can reason it out ... if we're careful. Consider any person, say "A". He will shake ...
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| Dependent variable and Independent varible | 10/19/2007 | Ellis Godard |
Q: Can you have a Dependent variable and not have Independent?
A: In principle, no. The dependent variable wouldn't be considered dependent without thinking that the ...
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| Probability of Poker Hands | 10/15/2007 | Soroban |
Q: I am having trouble with the following problems. 1)How many 5 card poker hands are there? and 2)What ...
A: Camilla! Who assigned this problem? This is a GIGANTIC task! Even those experienced with ...
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| probability | 10/14/2007 | Soroban |
Q: 25 coloured cubes, 5 each of red,blue, green, yellow,black in a bag. I choose 2. What is the chance ...
A: Brian! Your son is 11 and he's doing Probability? . . . Wow! There are complex methods for doing ...
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| Probability | 10/2/2007 | Soroban |
Q: A study conducted at a certain college shows that 57% of the school's graduates find a job in their ...
A: Deb! I don't know how you came up with your answer . . . The opposite of "at least one" is "NONE". ...
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| Random...or not so random...chance. | 10/1/2007 | Ellis Godard |
Q: I asked Soroban but he said it was outside his area of expertise. Perhaps you can help. I was ...
A: I'm not sure about the math, but you're right to be suspicious. The same student being selected that ...
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| statistics question | 9/30/2007 | Ellis Godard |
Q: how do changes in the size of a subsample affect shape of distributions? I am taking a random ...
A: increasing any (sub)sample size should, over the long run, "smooth" the distrubution's "curve" and ...
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| coin flip probability | 9/30/2007 | Soroban |
Q: If a fair coin is flipped 20 times, what is the probability that heads will come up EXACTLY 9 time. ...
A: Kelly! You have a chart for the answers? . . . Great! There is a formula for these "binomial" ...
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| Inventory sample size | 9/27/2007 | Ellis Godard |
Q: i have seen a few posts with regard to sample size but i cant find how to do this, so here it goes. ...
A: there are many resources for this on the web. search (eg on google) for "sample size calculator 95 ...
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| word problem | 9/24/2007 | Soroban |
Q: if we follow the hour and minute hands of a clock for 24 hours how many times will they form a right ...
A: JM! I'm sure there's an algebraic approach to this problem, but I haven't found it yet. If we ...
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| Probability- Poker Hands | 9/17/2007 | Soroban |
Q: I am stuck on the following"A poker hand consists of 5 cards dealt from an ordinary deck of 52 ...
A: Shanynn! >> For example C(4,3) = 4 ways. C(4,3) is a symbol for "4 things, taken 3 at a time". ...
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| Probability- Poker Hands | 9/17/2007 | Soroban |
Q: I am stuck on the following"A poker hand consists of 5 cards dealt from an ordinary deck of 52 ...
A: Shanynn! >> A poker hand consists of 5 cards dealt from an ordinary deck of cards. >> a) How ...
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| Probability | 9/12/2007 | Soroban |
Q: Of the 20 light bulbs in a box, 2 are defective. An inspector will select 2 light bulbs ...
A: Ryan! There are 20 bulbs: 2 defective and 18 good. Two bulbs are drawn at random. We want the ...
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| probability | 9/3/2007 | Soroban |
Q: The past records show that the probability of a river crossing the high flood mark in a year is 1/5. ...
A: asif! There is a cute trick we can use . . . We are told that: Pr(flood) = 1/5 = 0.2 ...
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| dependent vs independent variables | 9/3/2007 | Ellis Godard |
Q: I am just having a bit of confusion determining the difference between the independent and dependent ...
A: the dependent variable is the "effect", result, outcome, etc. the independent variable is the ...
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| probability | 9/2/2007 | Soroban |
Q: Approximately 30% of all homes in a licality have washing machines.What is the probabilty that in a ...
A: aasef! If this is a "Binomial Probability" problem, there is far too much work involved. ...
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| probability | 8/31/2007 | Soroban |
Q: Six seniors and five junior are running for 4 seats of running the prom activities. Find the odds ...
A: Jill! >> Six seniors and five junior are running for 4 seats. >> Find the odds that it contains ...
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| probability | 8/31/2007 | Soroban |
Q: All of David CD's are mixed up in a drawer. Twelve Cds are rock, 8 are jazz, 5 are classical. He ...
A: Bill! >> All of David's CDs are mixed up in a drawer. >> Twelve CDs are rock, 8 are jazz, 5 are ...
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| probability | 8/30/2007 | Soroban |
Q: 1)Three letters are selected from the word Arrangements. Find the probability that all three are ...
A: Matt! >> 1) Three letters are selected from the word "ARRANGEMENTS". >> Find the probability that ...
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| Probability | 8/30/2007 | Soroban |
Q: A jar contains 3 pennies, 8 nickels, 4 dimes, and 10 quarters. Two coins are selected at random. ...
A: John! >> A jar contains 3 pennies, 8 nickels, 4 dimes, and 10 quarters. >> Two coins are ...
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| Probability | 8/30/2007 | Soroban |
Q: A jar contains 3 pennies, 8 nickels, 4 dimes, and 10 quarters. Two coins are selected at random. ...
A: John! There are number of ways to solve this problem. I'll use the easiest method. There are ...
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| Sample size | 8/27/2007 | Ellis Godard |
Q: The company I work for has 2100 employees. We are interested in surveying a sample of our workforce ...
A: the minimum sample size requirements do indeed vary by test, so you'll want to resolve that asap. ...
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