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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 197,168
    07-16-2014, 11:01 AM Go to last post
  2. 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: 66,955
    09-30-2005, 09:44 AM Go to last post
  1. 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: 3,629
    09-19-2006, 09:31 AM Go to last post
  2. 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: 3,822
    09-18-2006, 08:44 PM Go to last post
  3. 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: 2,374
    09-18-2006, 08:35 PM Go to last post
  4. 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: 3,074
    09-18-2006, 08:31 PM Go to last post
  5. 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: 5,823
    09-18-2006, 01:26 PM Go to last post
  6. 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: 3,118
    09-18-2006, 01:25 PM Go to last post
  7. 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: 3,794
    09-18-2006, 01:20 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: 4,072
    09-18-2006, 11:28 AM Go to last post
  9. 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: 9,548
    09-17-2006, 07:45 PM Go to last post
  10. 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: 3,648
    09-17-2006, 02:23 PM Go to last post
  11. 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: 2,607
    09-17-2006, 02:21 PM Go to last post
  12. 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: 3,366
    09-17-2006, 09:39 AM Go to last post
  13. 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: 2,243
    09-16-2006, 06:24 PM Go to last post
  14. 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: 2,913
    09-15-2006, 10:09 PM Go to last post
  15. 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: 3,788
    09-15-2006, 01:47 AM Go to last post
  16. Moving Targets?

    Ok, here is my problem. I have two categories that I think are apples and oranges. The first deals with Dollars Delinquent percentage based on...

    Started by Mesmer‎, 09-14-2006 11:22 PM
    • Replies: 0
    • Views: 2,871
    09-14-2006, 11:22 PM Go to last post
  17. Decision analysis

    Equipment Favorbale Unfavorable Sub 100 300000 -200000 Oiler J 250000 -100000 Texan 75000 ...

    Started by Pipster‎, 09-14-2006 07:12 PM
    • Replies: 1
    • Views: 3,735
    09-14-2006, 09:09 PM Go to last post
  18. Frequencies

    Can some please explain to me the formula to frequency. I am totaly lost and professor is going to quiz us tomorrow.

    Started by n2c2mm2nt‎, 09-14-2006 06:25 PM
    • Replies: 6
    • Views: 2,923
    09-14-2006, 07:05 PM Go to last post
  19. Biodiversity and Population Density Correlations

    Hello there Consultants, :wave: I am doing a comparison between two data sets I have collected from two different habitats... I want to show that...

    Started by japo‎, 09-14-2006 10:20 AM
    • Replies: 0
    • Views: 4,289
    09-14-2006, 10:20 AM Go to last post
  20. Help with Confidence Interval, please

    Hi, I'm so rusty at statistics (took it a year ago) I've got the basic formula down, but this particular problem is hitting me in a blind spot. ...

    Started by HistoryStudentGWU‎, 09-13-2006 09:28 PM
    • Replies: 3
    • Views: 2,435
    09-14-2006, 06:25 AM Go to last post
  21. Question Confused

    I'm not sure if you can help me or not but I thought it would be worth a try. I am totally confused on what my proffessor gave me. He has tried...

    Started by princess‎, 09-13-2006 05:32 PM
    • Replies: 2
    • Views: 2,301
    09-13-2006, 10:31 PM Go to last post
  22. Thumbs down Z-Score?

    Hi, I'm having a problem figurung out what this question is asking: "Find the number Z such that the proportion of observations that are less...

    Started by RedFred2089‎, 09-13-2006 03:53 PM
    • Replies: 2
    • Views: 7,487
    09-13-2006, 07:59 PM Go to last post
  23. Question Help me out: Computing SE CV SED LSD

    Dear All, In calculating standard error of mean (SE) and coefficient of variation (CV) for summary table of means exported to excel from SAS anova...

    Started by analyst‎, 09-13-2006 08:19 AM
    • Replies: 0
    • Views: 9,643
    09-13-2006, 08:19 AM Go to last post
  24. Ogives help! tx~~

    Okay I've also been very confused on ogives ..the cumulative average concept. Is there a site that gives tutorials on them? b/c I cannot seem to...

    Started by xjinax8807‎, 09-12-2006 11:26 PM
    • Replies: 1
    • Views: 3,089
    09-12-2006, 11:30 PM Go to last post
  25. Help with box plots please!!!

    I really need help with this problem. Cassette versus Cd Sales] Has the increasing popularity of the compact disc (CD) affected sales of cassette...

    Started by xjinax8807‎, 09-12-2006 10:47 PM
    • Replies: 2
    • Views: 4,581
    09-12-2006, 11:20 PM Go to last post
  26. Moved: need help with Spss

    Started by wanye‎, 12-25-2006 09:46 PM
    • Replies: -
    • Views: -
    09-12-2006, 07:39 AM Go to last post
  27. ANOVA results and confidence intervals

    Hallo can someone help me with this problem, please? I have done a univariate 2 factor ANOVA with spss. The problem is that the 95% confidence...

    Started by sirhoppel‎, 09-11-2006 11:05 AM
    • Replies: 2
    • Views: 8,151
    09-11-2006, 08:53 PM Go to last post
  28. Exclamation Help, Please

    I am using the Least Regression Squares Method and for some reason I keep calculating the y-intercept incorrectly. Is it not the mean of Y - the...

    Started by pagemaster‎, 09-11-2006 04:00 PM
    • Replies: 1
    • Views: 2,357
    09-11-2006, 04:07 PM Go to last post
  29. Question Construct a 95% confidence interval ???

    Hi:) , I'm sort of confused with this statistics problem: As part of a recent study conducted in France investigating the effectiveness of...

    Started by jena2007‎, 09-10-2006 09:50 PM
    • Replies: 6
    • Views: 6,220
    09-10-2006, 11:46 PM Go to last post
  30. significant differences between 2 groups

    Hi, I have been trying to find out how I can most significantly analyse the differences between two groups in my survey (like male and female) on...

    Started by Leilsa‎, 09-10-2006 08:08 PM
    • Replies: 1
    • Views: 2,735
    09-10-2006, 10:17 PM Go to last post
  31. Question How to use a random sampling table

    Hi, How do you use a random sampling table :confused: Thank You:)

    Started by jena2007‎, 09-07-2006 11:38 PM
    • Replies: 2
    • Views: 3,976
    09-10-2006, 09:42 PM Go to last post
  32. Need help with a statistics assignment

    Hey, I need help with a statistics assignment,its 2 parts,ive done the first part on my own however as I am unable to do the second one and ask...

    Started by sal87‎, 09-10-2006 12:07 AM
    • Replies: 2
    • Views: 2,770
    09-10-2006, 05:40 PM Go to last post
  33. Question Type I and II, HO and H1

    I am committing to memory the definitions of the Type I and II error rates, but my brain is having difficulty when looking at a null and alternative...

    Started by kerber‎, 09-09-2006 10:02 PM
    • Replies: 2
    • Views: 8,821
    09-10-2006, 08:57 AM Go to last post
  34. mean of a fluctuating time series - what is the uncertainy?

    Hello. I very much appreciate your attention to my problem. I have lists of data generated by my computer simulations collected over simulation...

    Started by ata5d‎, 09-09-2006 09:37 AM
    • Replies: 4
    • Views: 2,594
    09-09-2006, 02:21 PM Go to last post
  35. Hi research student needs urgent help with simple problem

    Hi am writing my honours dissertation for sociology and need desperate help calculating a simple problem. Still, I don't even know if it can be done....

    Started by sublunar‎, 09-07-2006 05:15 AM
    • Replies: 7
    • Views: 3,103
    09-08-2006, 10:12 PM Go to last post
  36. Z and p value problem

    hi im obviusly new on this forum :) and ask for Your help im having results of research like this 4 groups (with no paracetamol, with 50,...

    Started by kikson‎, 09-07-2006 04:03 AM
    • Replies: 1
    • Views: 1,541
    09-07-2006, 08:39 AM Go to last post
  37. ordinal independent variables in ANOVA

    We have some data from a 2x5 factorial experiment which, when graphed, looks like an obvious interaction. The ANOVA, however, says the interaction...

    Started by CullingJ‎, 09-07-2006 06:07 AM
    • Replies: 1
    • Views: 5,009
    09-07-2006, 08:35 AM Go to last post
  38. Question Rank Comparisons

    Hi, First, thanks in advance for taking the time to look at this. Ok, here goes. I have an interview that lists 12 reasons for why respondents...

    Started by MsfStl‎, 09-06-2006 02:26 PM
    • Replies: 2
    • Views: 1,753
    09-06-2006, 03:10 PM Go to last post
  39. Struggling with written statistics question.

    Hello. I'm currently revising for a statistics re-sit examination and when going over past papers have found one question commonly appears. Both...

    Started by Frogs‎, 09-05-2006 11:56 AM
    • Replies: 1
    • Views: 2,377
    09-06-2006, 11:07 AM Go to last post
  40. Logistic regression and collinearity

    Hi everybody! I am working on a logistic regression model using spss. After performing a linear regression in order to use the collinearity...

    Started by mtranos‎, 09-06-2006 06:56 AM
    • Replies: 0
    • Views: 4,899
    09-06-2006, 06:56 AM Go to last post
  41. Interesting Standard Deviation Query

    Hi, My boss just asked me if we could use standard deviation for the following: A water treatment plant is recieving flow (F), which is...

    Started by nitinv‎, 08-31-2006 11:08 AM
    • Replies: 2
    • Views: 2,068
    09-06-2006, 04:47 AM Go to last post
  42. homework issues

    I have a question on homework as follows: In a normally distributed population that is very large, mu was found to be 100 and sigma = 20. If a...

    Started by darkmattress‎, 09-05-2006 04:45 PM
    • Replies: 1
    • Views: 1,843
    09-05-2006, 07:04 PM Go to last post
  43. True to assume equal variance when testing difference between the means???

    hi all, In testing for the difference between the means, is it true that we assume that each of the populations is normally distributed with equal...

    Started by wanye‎, 09-05-2006 06:10 AM
    • Replies: 1
    • Views: 7,042
    09-05-2006, 08:34 AM Go to last post
  44. Exclamation logistic regression

    If I estimate a logistic regression using a sample of 50:50 for my event and non-event. What adjustments do I make when predicting with the model if...

    Started by nwcmrc‎, 09-05-2006 04:01 AM
    • Replies: 0
    • Views: 1,733
    09-05-2006, 04:01 AM Go to last post
  45. Question Need help with quiz

    10.The reason the t statistic has more variability than the Z statistic is that from sample to sample a.the sample mean becomes smaller and the...

    Started by csiemer‎, 09-04-2006 08:20 PM
    • Replies: 2
    • Views: 2,646
    09-04-2006, 09:00 PM Go to last post
  46. logistic regression help

    I have estimated a logistic regression using a sample of 50:50 of the event and non-event. I know in the population that the actual probability of...

    Started by nwcmrc‎, 09-04-2006 04:12 PM
    • Replies: 0
    • Views: 1,873
    09-04-2006, 04:12 PM Go to last post
  47. inferences from two samples

    Anyone that might be able to help me out solving a few problems dealing with this topic? If you have AIM my AIM name is BigNiner19. Let me know,...

    Started by BigNiner19‎, 09-04-2006 11:05 AM
    • Replies: 2
    • Views: 3,055
    09-04-2006, 12:36 PM Go to last post
  48. Question Sample Sizes

    Oks. I have stressed a bit and am going to have another go. I have concluded that however I divide the data I have, I am going to end up with...

    Started by Stuck‎, 09-04-2006 10:13 AM
    • Replies: 3
    • Views: 3,790
    09-04-2006, 10:49 AM Go to last post
  49. Unhappy Very stuck with simple problem.

    Hi everyone, :wave: I am at the end of my tether with trying to sort out the statistics for my report. It's simple stuff but I am hopeless with...

    Started by Stuck‎, 09-04-2006 07:32 AM
    • Replies: 10
    • Views: 3,486
    09-04-2006, 09:48 AM Go to last post
  50. Maximum Likelihood Calculus Problems

    Hi all, this is my first post here, looks like a great place! I hope to use this board throughout my current semester as it is going to be a rough...

    Started by mcstl2525‎, 09-03-2006 01:48 PM
    • Replies: 0
    • Views: 2,499
    09-03-2006, 01:48 PM Go to last post
  51. p-value determines rejection of null hypothesis?

    Is it true that the larger the p-value, the more likely one is to reject the null hypothesis?

    Started by wanye‎, 09-03-2006 03:38 AM
    • Replies: 1
    • Views: 5,804
    09-03-2006, 07:45 AM Go to last post
  52. 2x2 Repeated Measures ANOVA

    Hi Everyone! I am working on a 2x2 repeated measures ANOVA and I am having trouble finding much information about it. Basically I taught the same...

    Started by im4avs‎, 08-23-2006 02:14 PM
    • Replies: 3
    • Views: 7,434
    09-03-2006, 07:11 AM Go to last post
  53. Smile Joint CDF's and pdf problem

    I am trying to solve part of a question whicg goes as: Q: Suppose X and Y are two continuous random variables whose joint density function is ...

    Started by hmm...chocolate..‎, 08-11-2006 05:00 PM
    • Replies: 7
    • Views: 8,369
    09-02-2006, 12:18 PM Go to last post
  54. Degrees of freedom

    Hi everyone, Can somebody please explain the concept of degrees of freedom in depth but made simple Thanks

    Started by ron‎, 08-27-2006 05:42 PM
    • Replies: 5
    • Views: 4,793
    09-02-2006, 08:24 AM Go to last post
  55. choosing the right non-parametric test

    Hi there, I am trying to analyze some data and am having trouble trying to figure out what to do. The data is a shrub/elk browse study. The data I...

    Started by japurd04‎, 08-31-2006 10:18 AM
    • Replies: 2
    • Views: 2,593
    09-01-2006, 10:25 AM Go to last post
  56. Time Series, exponential smoothing--I need help!

    Seems a really simple problem but it's bugging me. I'm using the exponential smmothing formula: NthForecast=k*(N-1)thY + (1-k)(N-1)thForecast,...

    Started by naivesincerity‎, 09-01-2006 09:58 AM
    • Replies: 0
    • Views: 2,805
    09-01-2006, 09:58 AM Go to last post
  57. Please help!

    Can someone help me to answer those questions: 1 - Assume X + Y are independent standard exponentially distributed random variable. Derive the...

    Started by Robert55‎, 09-01-2006 08:38 AM
    • Replies: 0
    • Views: 1,996
    09-01-2006, 08:38 AM Go to last post
  58. Finding the Reduced Form Equations

    Hey this is my first post here. I'm doing a regress with 5 equations and 5 endogenous vairables plus one unique exogenous variable to each equation....

    Started by mrgold‎, 08-31-2006 11:34 PM
    • Replies: 0
    • Views: 3,988
    08-31-2006, 11:34 PM Go to last post
  59. Multidimensional Scaling

    Does anyone have any esperience with multidimensional scaling with SPSS?

    Started by mfhund‎, 08-24-2006 10:19 AM
    • Replies: 1
    • Views: 3,002
    08-31-2006, 10:43 AM Go to last post
  60. how do you know if a relationship really exists?

    So i had a problem where I was supposed to calculate a correlation coefficient for some data using the definitional formula and then interpret the...

    Started by Duncan‎, 08-30-2006 12:17 PM
    • Replies: 4
    • Views: 3,180
    08-31-2006, 10:20 AM Go to last post

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