| Subject | Date Asked | Expert |
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| probability | 4/18/2009 | Surajit Basu |
Q: "a box contain 6 red ,4 white,and 5 black balls.a person draws 4 balls from the bo at random.find ...
A: 1. How many different selections are possible? There are 6 red ,4 white,and 5 black balls. a person ...
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| types of data | 1/20/2009 | Joe Engels |
Q: I'm trying to figure out the different types of data (categorical, interval, etc- what does IQ test ...
A: Most people say: Discrete and continuous A type of data is discrete if there are only a finite ...
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| Maths statistics probability | 10/21/2008 | Surajit Basu |
Q: A boy recieves a school report card each week. He is given a special treat whenever whenever his ...
A: Event: GB = getting "good behaviour" . P(GB) = 0.6. Event: EH = doing excellent homework if GB, ...
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| Probability | 10/17/2008 | Surajit Basu |
Q: What is chance?
A: something may happen or not happen. i toss a coin: it may land heads, or tails. will it rain today ...
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| Linear Regression | 10/10/2008 | Vivian |
Q: I have a problem on my homework that says a) For X=40 show by calculation that the parallel lines ...
A: You may use the standard error of parameters (intercept and slopes) of the regression line to get ...
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| choice of statistic | 10/10/2008 | Vivian |
Q: I have the following variables that I would like to examine but am struggling to work out which ...
A: Because of the potential need to change my DVs of depression and perhaps into categorical variables, ...
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| using ROC curves and Signal detection theory | 10/4/2008 | Vivian |
Q: I am really hoping you will be able to help me out with my question because thus far the internet ...
A: I am new to signal detection approach. I googled it and it seems to be a theory in psychology. To ...
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| lightbulb | 10/2/2008 | Vivian |
Q: A lightbulb i supposed to have a expected life expectancy of a 1000 hours normally distributed with ...
A: Here we want to test the null hypothesis: a lightbulb has an expected life expectancy of 1000 hours ...
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| 3 variables with 3 levels each | 10/2/2008 | Vivian |
Q: I have a geneticsI have three loci (C, P and D), each having 3 possible levels (homo, het, absent). ...
A: Let us only consider the first two loci. The possible genotypes are Homo homo Homo het Homo ...
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| A | 9/2/2008 | Surajit Basu |
Q: I would really appreciate your help on the following query: I am looking at quarterly data from ...
A: it is tough to make a generic statement. if the seasonality is high, e.g. with sales curves which ...
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| more help | 7/24/2008 | Jason Eisele |
Q: the recent increase in tuition fees claimed that it would provide classes with 50 desktops per room. ...
A: This is a very similar question, so understanding the previous answer will show you that we cannot ...
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| confidence interval help please | 7/24/2008 | Jason Eisele |
Q: i'm currently taking applied math right now and my background in math is pretty shallow. can you ...
A: We can never conclude that a true mean is above (or below) the sample mean by sampling alone. What ...
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| project: linear regression | 7/22/2008 | Jason Eisele |
Q: I don't know where to start with my project. I have to compare two variables. area of interest/why ...
A: Is this a final project for a course? This is testing a lot of information, so I recommend reviewing ...
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| bingo game statistics | 7/21/2008 | Jason Eisele |
Q: I am creating a bingo game for work but instead of using the standard bingo game, I want to create ...
A: If you make 5x5 cards with one free space in the middle of each, you won't have to worry very much ...
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| Skewness and kurtosis | 7/21/2008 | Jason Eisele |
Q: What is generally meant by Skewness and kurtosis and what's the statistical meaning of it?If you ...
A: While these are not areas of my expertise, they will be touched on in many statistics courses and ...
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| statistics question | 7/21/2008 | Jason Eisele |
Q: A softball player has a 30% chance of getting a hit each time she comes to bat. Assuming that each ...
A: These are good questions that test your fundamental knowledge of probability concepts. Hopefully ...
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| probability and statistics for engineers and scientist 7th edition | 7/20/2008 | Jason Eisele |
Q: 2. In a medical study patients are classified in 8 ways according to whether they have blood type AB ...
A: We have 8 different blood types and 3 different pressures. Any blood type can pair with any pressure ...
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| statistical probability | 7/19/2008 | Jason Eisele |
Q: Can you figure the statistical probability that 2 people playing rock, paper, scissors came up with ...
A: Dr. Lynn, Thanks for your question! Since there are three different ways Player A can throw, and ...
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| percentage | 7/6/2008 | Joe Engels |
Q: I had a question on my math quiz that goes like this: Mr. R's monthly salary is $2500. His monthly ...
A: Why is it not 520/1980*100=26.26%??? You can also do 1-(1980/2500)*100 The point is you want to ...
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| Estimating Probability | 6/21/2008 | Surajit Basu |
Q: In a study of 685 cars in a parking lot, there were only 3 different types: sedan, sports car and ...
A: I wont answer the question fully, I will guide you. How many sedan or sports cars are there? ( 685 ...
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| stan 111 | 6/18/2008 | Surajit Basu |
Q: a class consists of 8 boys and 6 girls, a committee of three persons is to be constituted fromthe ...
A: 1. a class consists of 8 boys and 6 girls, a committee of three persons is to be constituted from ...
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| Probability question | 6/3/2008 | Vivian |
Q: can you please answer this question? it rains 40 of the year in Seattle. if 8 days are chosen at ...
A: The number of the day it rained follows a hypergeometric distribution. P (at most 2 of the days it ...
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| Choosing a statistical test | 6/3/2008 | Vivian |
Q: I am having problems in analyzing a set of data. I have found that, at times, a one-way ANOVA ...
A: If a one-way ANOVA yields a significant p-value, it means that at least one comparison between means ...
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| Probability | 5/31/2008 | Vivian |
Q: A. From a lot of 12 flares, 4 are selected at random. If the lot contains 4 defective flares, what ...
A: Sorry for my delay! A. From a lot of 12 flares, 4 are selected at random. If the lot contains 4 ...
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| statistics | 5/31/2008 | Vivian |
Q: Is there any relationship between level of significance eg. LSD and correlation eg R squared? ...
A: Interesting question. But, I am not sure about the scenario you are talking about. Does LSD stand ...
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| probabilty | 5/31/2008 | Vivian |
Q: 1. Let A and B two events. Suppose that P (A) = 0.4, P (B) = p, and P(A U B)=0.8 a) For what value ...
A: 1. Let A and B two events. Suppose that P (A) = 0.4, P (B) = p, and P(A U B)=0.8 a) For what value ...
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| Probability | 5/29/2008 | Vivian |
Q: A certain tennis player makes a successful first serve 70% of the time. Assume that each serve is ...
A: Can I say that the probability that the player makes a successful trial is 0.7? The reason for me to ...
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| Determing samples size for small vs large populations | 5/27/2008 | Vivian |
Q: Simplified terms: If n=75 and population "A" is 10,000 and population "B" is 10,000,000. Would n=75 ...
A: Whether a test is unbiased or biased is not dependent on the sample size. Also, whether an estimator ...
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| Statistics | 5/27/2008 | Vivian |
Q: I am trying to determine a way to find the various combinations that would lead to a sum of 1 for a ...
A: Could u possibly explain it in details (such as more examples, formula)? I do not understand your ...
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| Probablities | 5/26/2008 | Vivian |
Q: "Synopsis: A survey found that 23% of respondents stick with their tour group. (No total number of ...
A: The total number of travelers who stick with their groups out of a sample has the binomial ...
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| Probability | 5/26/2008 | Surajit Basu |
Q: Synopsis: A survey found that 23% of respondents stick with their tour group. (No total number of ...
A: In a sample of 10 travelers, what is the probability that NONE will stick with their group? That ...
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| probabilities | 5/26/2008 | Vivian |
Q: I have 35 consecutive numbers. I randomly chose any 5 numbers, no two numbers being the same. What ...
A: Sorry. I mean 1-0.44=0.56. It is 1-the number of 5-combinations from 35 elements*the number of ...
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| math | 5/24/2008 | Surajit Basu |
Q: these are really basic questions for the praxis test. thank you. How do I find out what fractions ...
A: if you want to know if any two factions a/b and c/d are equivalent, you can check if a*d = b*c are ...
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| probability and statics | 5/24/2008 | Vivian |
Q: how many distinct permutations can be formed from the letters of th word PLANE
A: The number of ways to arrange all the alphabets in the word is 5! (5 factorial). The number of ...
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| Probability | 5/23/2008 | Vivian |
Q: A die is thrown 20 times and a success is defined as a one or a six on the upface of the die. Use ...
A: The total number of success out of 20 trials has the binomial distribution with the probability of ...
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| statistics | 5/23/2008 | Vivian |
Q: For 75 employees of a large department store, the following distribution for years of service was ...
A: please read the definition and examples at http://en.wikipedia.org/wiki/Histogram You may draw it by ...
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| Probability | 5/22/2008 | Vivian |
Q: Gerry Infeld has a batting average of 0.326. What is the probability that he will have 2 hits in his ...
A: The total number of hits out of his next 5 trials has the binomial distribution with the probability ...
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| statistics | 5/22/2008 | Vivian |
Q: The heights in inches of commonly grown herbs are shown. Organize the data into a frequency ...
A: I think there are many ways to organize the data into a frequency distribution with six classes. You ...
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| Probability | 5/19/2008 | Surajit Basu |
Q: 30 out of 100 boys and 36 out of 100 girls knows the answer to the question that their teacher ...
A: How many students are there ? 200 ? And is the number of boys and girls the same? Assume so. Then ...
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| Probability | 5/18/2008 | Surajit Basu |
Q: A die is thrown 20 times and a success is defined as a one or a six on the upface of the die. Use ...
A: what are the chances of getting a one/six ? 2 out of 6 ways. So probability of success = p(E) = 2/6 ...
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