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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,855
    09-30-2005, 09:44 AM Go to last post
  2. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,951
    07-16-2014, 11:01 AM Go to last post
  1. Resultant of two distribution (Normal)

    If there are two normal distribution having mean and s.d M1,SD1 and M2,SD2 respectively, what would be the mean and s.d of the resultant these two...

    Started by sandiphw‎, 09-12-2006 10:46 PM
    • Replies: 4
    • Views: 3,781
    09-15-2006, 01:47 AM Go to last post
  2. Question Power of one sample test for variance

    Hi, I have been trying to test the following hypotheses. H0 : sigma = 10 H1 : sigma != 10 the sample size is 200 and the sigma observed is...

    Started by ashwinikumarp06‎, 09-13-2006 02:01 PM
    • Replies: 1
    • Views: 2,900
    09-15-2006, 10:09 PM Go to last post
  3. histogram ...is this correct..???

    For this problem: THe data set below shows the number of pennies in 8 random samples of 20 coins drawn from an infinitely large jar of coins: 7...

    Started by xjinax8807‎, 09-16-2006 05:40 PM
    • Replies: 2
    • Views: 2,236
    09-16-2006, 06:24 PM Go to last post
  4. multiway frequency analysis, Canonical correlation

    I have a set of survey report of my college students who decided to change to other schools. There were 3,000 students surveyed over the 10 year...

    Started by jbland‎, 09-17-2006 08:19 AM
    • Replies: 1
    • Views: 3,358
    09-17-2006, 09:39 AM Go to last post
  5. An ogive problem im not sure about...

    From a constructed histogram, how make a cumulative frequency graph for it? Like say they list 50 states with their percentages (10%, etc..)of...

    Started by xjinax8807‎, 09-16-2006 06:47 PM
    • Replies: 1
    • Views: 2,600
    09-17-2006, 02:21 PM Go to last post
  6. histogram....

    I'm also not sure about this problem: The times (in minutes) for 42 consecutive weekdays, with the dates in order along the rows: 8.25 7.83 ...

    Started by xjinax8807‎, 09-17-2006 12:15 AM
    • Replies: 2
    • Views: 3,625
    09-17-2006, 02:23 PM Go to last post
  7. Stratified Samples ???

    Hi, I'm having some trouble with this question. The question asks Stratified samples are widely used to study large areas of forest. Based...

    Started by jena2007‎, 09-11-2006 11:11 PM
    • Replies: 4
    • Views: 9,529
    09-17-2006, 07:45 PM Go to last post
  8. How to compare Probit means between two groups.

    I have calculated probit median (mean) ages of attainemnt of various stages (skeletal maturity) for two independent groups of subejcts. How can I...

    Started by kefth‎, 09-16-2006 06:10 AM
    • Replies: 2
    • Views: 4,048
    09-18-2006, 11:28 AM Go to last post
  9. Symmetric or not?

    I know that when the mean and the median is close in values to each other, the distribution will be symmetric. But how close should they be? I have...

    Started by Christy‎, 09-18-2006 12:24 PM
    • Replies: 1
    • Views: 3,780
    09-18-2006, 01:20 PM Go to last post
  10. Confusion!!

    Hello, I am new to stats and have a couple basic questions regarding sampling , the central limit theorem and probability. If the sample size...

    Started by vivrang‎, 09-18-2006 03:23 AM
    • Replies: 1
    • Views: 3,108
    09-18-2006, 01:25 PM Go to last post
  11. Empirical rule & Negative intervals

    When calculating interval I got a negative interval: (-6406371 -> 14892937) I have to make a statement about the percentage that you would...

    Started by rowmc‎, 09-17-2006 04:32 PM
    • Replies: 1
    • Views: 5,793
    09-18-2006, 01:26 PM Go to last post
  12. more permutations

    find the number of ways of arranging the letters of MATCHING if; a. there are no restrictions; b. the first letter must be M; c. the odd numbered...

    Started by xo_caroline_xo‎, 09-18-2006 06:36 PM
    • Replies: 3
    • Views: 3,058
    09-18-2006, 08:31 PM Go to last post
  13. More questions about symmetry

    How can a distribution be symmetric and be positively/negatively skewed? What does reasonably symmetic means? What do they mean by a distribution...

    Started by Christy‎, 09-18-2006 08:08 PM
    • Replies: 1
    • Views: 2,365
    09-18-2006, 08:35 PM Go to last post
  14. permutations

    1. A combination lock has 60 different positions. To open the lock, you move to a certain number in a clockwise direction, then to a number in the...

    Started by xo_caroline_xo‎, 09-18-2006 06:28 PM
    • Replies: 2
    • Views: 3,806
    09-18-2006, 08:44 PM Go to last post
  15. Which Tests are appropriate?

    I have created a survey where participants state their agreement with my statements on a 7 point likert scale. Also 3 category questions, eg their...

    Started by Free Soul‎, 09-17-2006 10:28 AM
    • Replies: 6
    • Views: 3,616
    09-19-2006, 09:31 AM Go to last post
  16. sample size determination

    Sample size determination: Our database: There is a historical code preference from our customer. We like to give some credit to the customer who...

    Started by jimmy23‎, 09-19-2006 11:13 AM
    • Replies: 0
    • Views: 2,334
    09-19-2006, 11:13 AM Go to last post
  17. Moved: a probability problem

    Started by mithrandil‎, 12-25-2006 09:46 PM
    • Replies: -
    • Views: -
    09-19-2006, 08:17 PM Go to last post
  18. Thoughts on appropriate comparison tool

    Greetings from a new joiner! Great forum! I had a question about analysis. I have a decent background in analysis, though have been "out of...

    Started by quadraphonic‎, 09-20-2006 11:20 AM
    • Replies: 4
    • Views: 3,394
    09-20-2006, 12:54 PM Go to last post
  19. Question Central Limit Theorem ???

    Hi, I'm having trouble understanding this problem. Our professor gave the answer to study with, but I can't understand why the probabilities...

    Started by jena2007‎, 09-20-2006 12:49 PM
    • Replies: 1
    • Views: 3,879
    09-20-2006, 01:06 PM Go to last post
  20. Which test to use?!

    Hi, I'm having to use nonparametric methods to analyse some data owing to an abnormal distribution which results from a disprortionate number of...

    Started by Rachelb‎, 09-20-2006 03:33 AM
    • Replies: 6
    • Views: 2,563
    09-20-2006, 02:01 PM Go to last post
  21. Floor Effects

    Hi! I want to compare two groups on an accuracy measure (measured as a %). I have assessed the ditribution of scores for each groups, and while...

    Started by Alsvartr‎, 09-20-2006 04:19 PM
    • Replies: 2
    • Views: 5,695
    09-21-2006, 05:13 AM Go to last post
  22. Sample size for regression equation?

    If I know what I want in terms of confidence level and interval, is there some rough way to gauge how large a sample size I need for an equation of...

    Started by CBedo‎, 09-19-2006 12:47 PM
    • Replies: 4
    • Views: 4,399
    09-21-2006, 06:57 AM Go to last post
  23. Interaction Model

    Hi everyone! This is a really nice site, and i am glad for finding it in google. I want some help to run an interaction model. I have a...

    Started by knanopoulos‎, 09-21-2006 01:11 PM
    • Replies: 0
    • Views: 2,237
    09-21-2006, 01:11 PM Go to last post
  24. Discrete or Continuous

    Can someone please tell me if I got these right... The number of cups of coffee sold in a cafeteria during lunch = DISCRETE The cost of a...

    Started by JBM‎, 09-21-2006 01:00 PM
    • Replies: 1
    • Views: 5,649
    09-21-2006, 01:45 PM Go to last post
  25. Index making

    Hi, I've been struggling with this one for months now: I've done a survey which tries to link objective to subjective data The project is...

    Started by Oechel‎, 09-21-2006 04:01 PM
    • Replies: 0
    • Views: 1,965
    09-21-2006, 04:01 PM Go to last post
  26. interaction effects in regression analysis

    hello all together, maybe someone could help me with this. I've conducted a regression analysis including an interaction term. as a result it...

    Started by leichtsinn‎, 09-20-2006 03:46 AM
    • Replies: 4
    • Views: 2,975
    09-22-2006, 07:25 AM Go to last post
  27. Acceptable Pins

    Hello, I am drawing a complete blank for some reason on the second half of this problem. It is the age old acceptable pins problem. The mean is...

    Started by will‎, 09-21-2006 09:41 PM
    • Replies: 1
    • Views: 4,356
    09-22-2006, 01:06 PM Go to last post
  28. Simple dice problem

    I shold know the answer to this but it's been many years.... I toss a dice 120 times. How do I calculate the probability of correctly guessing...

    Started by Michael Heap‎, 09-22-2006 01:09 PM
    • Replies: 1
    • Views: 2,666
    09-22-2006, 01:15 PM Go to last post
  29. Question Linear Programming

    Hello, I have the following linear programming question: Company 1: maximize: z=3x1+4x2+6x3+x4 subject to: x1+x2 <= 500 x3+x4 <= 50 x1+x3 <=...

    Started by e. cools‎, 01-13-2006 05:52 AM
    • Replies: 1
    • Views: 6,075
    09-24-2006, 12:44 PM Go to last post
  30. Wink Food service satisfaction survey - 4 point Likert scale

    Good morning, This is my first posting... I am a dietitian with a master degree. I am doing research in Clientele satisfaction (i.e. quality of...

    Started by Isabelle‎, 09-25-2006 09:13 AM
    • Replies: 3
    • Views: 11,994
    09-25-2006, 02:40 PM Go to last post
  31. Question t-test dependant sample

    If I want to compare means of one group pre and post intervention, does it matter if the follow up time was different for the pre intervention and...

    Started by sushmaja‎, 09-20-2006 05:24 PM
    • Replies: 4
    • Views: 4,011
    09-25-2006, 05:36 PM Go to last post
  32. guidelines on doing a good statistic report ?

    Hi all, are there any links or samples of good statistic reports for reference? i need to prepare a statistic reports with a max of 8 pages(with...

    Started by wanye‎, 09-27-2006 11:06 AM
    • Replies: 0
    • Views: 2,393
    09-27-2006, 11:06 AM Go to last post
  33. Normal distribution in the exponent

    In excel, if you raise the normal distribution to an exponent why do you get exponential growth? i.e. if e^0=1 then when you have S=Se^w, where ...

    Started by Liam Marcus‎, 09-27-2006 12:52 PM
    • Replies: 0
    • Views: 2,225
    09-27-2006, 12:52 PM Go to last post
  34. help-logistic regression model

    i ran a logistic model with 6 variables. but lift is one 1.5 at top 5% scored target list. P-value for each variable is small, (0.000), i just don't...

    Started by lxm218‎, 09-27-2006 01:33 PM
    • Replies: 0
    • Views: 3,281
    09-27-2006, 01:33 PM Go to last post
  35. probably an easy problem!!

    I have a somewhat simple statistical problem, but i'm not sure if I'm doing this right. The mean and standard deviation on a test were 50 and 20,...

    Started by Dolphins1544‎, 09-27-2006 09:17 AM
    • Replies: 1
    • Views: 2,349
    09-27-2006, 07:29 PM Go to last post
  36. interaction effect?

    how to tell whether from the attached pdf below 1)there is relationship between between average number of purchases per quarter with the...

    Started by wanye‎, 09-28-2006 10:24 AM
    • Replies: 0
    • Views: 2,043
    09-28-2006, 10:24 AM Go to last post
  37. Anyone know how to do Correlation and Regression?

    I'm working on problems dealing with correlation and regression. It tells me that I can use the TI-83 calculator and punch in paired data lists L1...

    Started by BigNiner19‎, 09-28-2006 06:33 PM
    • Replies: 0
    • Views: 3,397
    09-28-2006, 06:33 PM Go to last post
  38. Repeatability

    Hi Folks, I am a newbie in stats. I had a couple of questions which I would really appreciate if you could take the time to answer. I want to...

    Started by thewildleo‎, 09-28-2006 11:58 PM
    • Replies: 0
    • Views: 4,887
    09-28-2006, 11:58 PM Go to last post
  39. Average of Standard Deviation?

    I am hoping this is an easy one. I have employees that work at different stores on different days of the week. My employees have different start...

    Started by GustoTangerine‎, 09-28-2006 09:05 AM
    • Replies: 1
    • Views: 3,584
    09-29-2006, 10:11 AM Go to last post
  40. Question power analysis

    i'm helping out with the power analysis for a study that is using 6 independent variables and one dependent variable. orginially, i suggested a...

    Started by teanabeana‎, 09-25-2006 01:43 PM
    • Replies: 7
    • Views: 3,893
    09-29-2006, 11:10 AM Go to last post
  41. new to linear programming

    hello all i just started to learn about linear programming and solving and boy i got a long problem to deal with..i am not asking anybody to do it...

    Started by rockerdude420‎, 09-30-2006 08:53 AM
    • Replies: 0
    • Views: 5,750
    09-30-2006, 08:53 AM Go to last post
  42. average of two means from the same data?

    I've been given two means from the same data set (split into people who said yes and no) from this i have to find the mean of the total of the data....

    Started by twitchy‎, 09-30-2006 02:05 AM
    • Replies: 2
    • Views: 10,147
    10-01-2006, 08:19 AM Go to last post
  43. Converting Mean to Z Value

    I have a few problems to figure out where I need to convert x intervals to a z interval. I used this format: z = x-u/o. I became confused where...

    Started by joyce72266‎, 09-30-2006 04:15 PM
    • Replies: 1
    • Views: 2,987
    10-01-2006, 12:55 PM Go to last post
  44. Which Statistics Test Do I Use?

    We are giving 400 people a survey asking them the following about our phone services, what statistical test do we run for each of these? 1.) As...

    Started by lstanley‎, 09-22-2006 07:55 AM
    • Replies: 5
    • Views: 2,739
    10-01-2006, 01:13 PM Go to last post
  45. Question HELP! Which stat test do I use???

    I am currently working on my Masters thesis and am having some difficulties with what test to use for my data. I am comparing intelligence tests and...

    Started by stacyrobinson‎, 09-30-2006 06:54 PM
    • Replies: 5
    • Views: 3,987
    10-01-2006, 09:21 PM Go to last post
  46. p-charts for complaint monitoring

    I am in a position where I am looking at complaints for different products. It has been tradition to monitor the complaints using a modified p-chart...

    Started by statgirl26‎, 09-25-2006 03:32 PM
    • Replies: 6
    • Views: 3,462
    10-02-2006, 08:17 AM Go to last post
  47. cointegration and dummy variable

    If we have a time series with shift dummies and test it for cointegration with another time series, do we have to include the dummies in the time...

    Started by Tzveta Iordanova‎, 10-02-2006 09:55 AM
    • Replies: 0
    • Views: 3,190
    10-02-2006, 09:55 AM Go to last post
  48. Chi-Square Goodness of fit Test

    Hi, I would like to know the minimum number of times it is necessary to throw a dice to run a Chi-Square Goodness of fit Test (and get...

    Started by StatLearner‎, 09-26-2006 01:41 PM
    • Replies: 1
    • Views: 2,992
    10-02-2006, 01:38 PM Go to last post
  49. Thumbs up Assumptions of t-test

    Just a quick question (hopefully). Can I use a between-groups t-test (assuming unequal variances) if one of the two groups I'm comparing (but not the...

    Started by benambridge‎, 10-02-2006 06:51 AM
    • Replies: 1
    • Views: 3,295
    10-02-2006, 05:34 PM Go to last post
  50. Question Interpret...?

    Hey, I'm trying to do this lab for my Stats Class but I'm a little confused. It says: "11. Calculate and interpert r and r^2 for the data." What...

    Started by RedFred2089‎, 10-01-2006 10:35 PM
    • Replies: 2
    • Views: 4,427
    10-02-2006, 05:36 PM Go to last post
  51. Level of Measurement?

    My current homework requires this.Im having some trouble with getting things in line. What category meaning (nominal, ordinal, interval, or ratio) do...

    Started by statsstudent‎, 10-02-2006 02:08 AM
    • Replies: 1
    • Views: 3,208
    10-02-2006, 05:38 PM Go to last post
  52. Help Please!!

    1.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35, find P(X ≤ 1) 2.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35,...

    Started by Leper Messiah‎, 10-01-2006 09:28 PM
    • Replies: 1
    • Views: 1,801
    10-02-2006, 05:41 PM Go to last post
  53. Statistical test used

    We are testing 4 different training methods on a group of drivers and want to determine if there are any differences among the 4 methods. We are...

    Started by lstanley‎, 10-01-2006 08:03 PM
    • Replies: 1
    • Views: 2,116
    10-02-2006, 05:43 PM Go to last post
  54. Cool Instructor rating versus performance

    Hello, I am trying to figure out the following problem: Let's say we have driving instructor teaching a group of students how to drive and along...

    Started by lstanley‎, 10-01-2006 07:00 PM
    • Replies: 1
    • Views: 2,024
    10-02-2006, 05:45 PM Go to last post
  55. Red face Stats Test?

    Hi there, Can you help me with what test to use in the following example situation: It is predicted that the driver training method "A"will...

    Started by lstanley‎, 10-01-2006 07:06 PM
    • Replies: 1
    • Views: 2,667
    10-02-2006, 05:46 PM Go to last post
  56. ANOVA vs. MANOVA

    Can you provide a good example that can describe the differences between ANOVA vs. MANOVA? I know the primary differences is that MANOVA involves...

    Started by lstanley‎, 10-01-2006 04:03 PM
    • Replies: 1
    • Views: 3,327
    10-02-2006, 05:47 PM Go to last post
  57. Inferential/Descriptive Statistics?

    I cant figure out each of the following correct answer. (a)By examining the results of a statewide poll it was estimated that 52% of the...

    Started by statsstudent‎, 10-02-2006 07:32 PM
    • Replies: 1
    • Views: 2,562
    10-02-2006, 08:14 PM Go to last post
  58. How to combine several data sets

    I have hourly logs of web server response times that I need to combine into a daily summary. I don't have the original source data or I would just...

    Started by mr_camp‎, 10-03-2006 10:23 AM
    • Replies: 3
    • Views: 5,686
    10-03-2006, 12:53 PM Go to last post
  59. Relationships between variables

    Hello, Our current research work involves analysis of relationships between variables based on historical data. In general, the dataset is in the...

    Started by wstach‎, 10-03-2006 02:19 PM
    • Replies: 0
    • Views: 2,027
    10-03-2006, 02:19 PM Go to last post
  60. control charts-type I error

    My control chart has a type I error rate of 0.0027 (3 standard deviations). I am comparing 5 months of signals to my baseline UCL. Am I inflating...

    Started by statgirl26‎, 10-03-2006 04:31 PM
    • Replies: 1
    • Views: 2,903
    10-03-2006, 07:45 PM Go to last post

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