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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: 196,722
    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: 66,733
    09-30-2005, 09:44 AM Go to last post
  1. The other formula for SD

    We all know the formula for SD But I recall a pal of mine long long ago showing me another formula for working out SD that - he argued - was far...

    Started by Philyuko‎, 01-13-2009 09:00 AM
    • Replies: 7
    • Views: 9,723
    01-01-2013, 03:36 PM Go to last post
  2. Census vs. Sample

    I am looking for more clarification on how a census survey is usually analyzed and reported. While there is a lot of information on how to go about...

    Started by apdragon‎, 11-03-2009 04:50 PM
    • Replies: 7
    • Views: 8,322
    05-07-2012, 04:03 AM Go to last post
  3. Standard deviation of the Ratio of two means

    Hi, guys I have two sets of data: A and B. I want to calculate a ratio of average(A)/average(B). I wonder if there is a way to get the...

    Started by shanshuiii‎, 03-02-2011 05:34 PM
    • Replies: 7
    • Views: 54,759
    07-08-2012, 09:36 AM Go to last post
  4. Correlate a continuous with a binary variable

    Hey everyone. I have a simple problem and was hoping to get your advice with. I am trying to correlate a continuous variable with a binary one....

    Started by Itai‎, 09-12-2011 09:52 AM
    binary, correlation, statistic
    • Replies: 7
    • Views: 52,523
    02-08-2012, 09:43 PM Go to last post
  5. Outliers and multiple linear regression

    I was reading about diagnostics with respect to outliers and it talks about studentized residual, cook's d and jackknife that detect how an outlier...

    Started by StatsClue‎, 02-07-2012 10:25 PM
    • Replies: 7
    • Views: 3,414
    02-12-2012, 09:41 PM Go to last post
  6. strength of predictors in MR

    Hello, I have a stats question related to interpreting results from multiple regression. If you are running a multiple regression with four...

    Started by psychologygirl‎, 02-10-2012 03:55 PM
    • Replies: 7
    • Views: 1,908
    03-06-2012, 10:52 AM Go to last post
  7. What statistical test do I need to use?

    Hello, I have done an experiment in my coursework and want to find out what the differences are between three groups. The experiment looked at...

    Started by GuyGomarez‎, 02-17-2012 02:20 PM
    • Replies: 7
    • Views: 3,490
    02-17-2012, 05:05 PM Go to last post
  8. Student's t-distribution table

    Dear all, In a Lineair Single Regression example, I have a hypothesis: H_0: ß = 0. Normally T will than be: T= (b - ß) / se(b) but, since I...

    Started by JBtje‎, 03-03-2012 11:48 AM
    betha, single lineair regression, t-distribution
    • Replies: 7
    • Views: 4,312
    03-04-2012, 07:15 AM Go to last post
  9. Linear Regression Question

    If rxy=.79, then we could predict y to be ____________ if x is a high score? a. high b. low c. consistent d. undertiminable I believe the...

    Started by jmckay330‎, 03-08-2012 07:29 PM
    • Replies: 7
    • Views: 3,344
    03-11-2012, 01:04 AM Go to last post
  10. I am not sure how Central Limit Theorem, and the t-distribution fit together.

    Hello, By Central Limit Theorem CLT if the sample size is large enough, the distribution of the sample means is approximately normal. This result...

    Started by Akavall‎, 03-13-2012 09:28 PM
    • Replies: 7
    • Views: 7,412
    03-14-2012, 12:36 PM Go to last post
  11. Question How many yellow balls in the basket?

    I have 48 baskets that contain 100 balls in 10 different colors randomly placed. There is anywhere from 1 ball to 10 balls in each basket, but no...

    Started by Zolie‎, 03-13-2012 11:18 PM
    • Replies: 7
    • Views: 2,446
    03-14-2012, 08:49 AM Go to last post
  12. Having trouble identifying orthogonal contrasts

    Hi there My task is to figure out which pairs of contrasts are orthogonal to one another Group 1 Group 2 Group 3 Group...

    Started by psychdancer‎, 03-17-2012 01:58 PM
    • Replies: 7
    • Views: 3,638
    03-17-2012, 08:43 PM Go to last post
  13. Acceptance Sampling

    We are working on continuity corrections and using normal distribution to approximate the binomial distribution. I breezed through 22 questions but...

    Started by kelly g‎, 03-23-2012 02:16 AM
    • Replies: 7
    • Views: 4,411
    03-23-2012, 04:16 AM Go to last post
  14. What does it mean to have only the intercept term in the model? (and Type 1 SS qs)

    This never made sense to me. How is it even a model when there is no variable? How do you write the code, for just the intercept term in the...

    Started by StatsClue‎, 04-06-2012 04:55 PM
    • Replies: 7
    • Views: 2,431
    04-06-2012, 07:50 PM Go to last post
  15. Is a Chi Square an appropriate test for this situation?

    Hello : ) I've been struggling for a while with this now; any help will be very much appreciated. I'm working on a project, which in part looks at...

    Started by axispeace‎, 04-17-2012 06:50 AM
    • Replies: 7
    • Views: 1,814
    04-20-2012, 11:27 AM Go to last post
  16. A question on central limit theorem

    Hi I have a quick question on central limit theorem. I am missing something obvious so hoping someone can help. If we had a sample set of say...

    Started by curious‎, 04-24-2012 10:36 PM
    central limit theorem
    • Replies: 7
    • Views: 2,914
    05-03-2012, 12:39 PM Go to last post
  17. Statistical analysis - help with paired t-test

    I want to compare two sets of data from an experiment, the test data, against the control. The two groups are clearly different, with around a...

    Started by becky127‎, 04-27-2012 10:51 AM
    • Replies: 7
    • Views: 1,668
    04-30-2012, 04:42 PM Go to last post
  18. Multiple linear reg (some obs. not independent)

    Building a multiple linear reg. model. Some patients (less than 10% I suspect) underwent the same procedure twice and are listed as two seperate obs....

    Started by StatsClue‎, 05-04-2012 04:26 PM
    • Replies: 7
    • Views: 2,759
    05-06-2012, 01:58 PM Go to last post
  19. Test Hypothesis and Significance

    Is it possible to test a hypothesis to show that there is no significant difference between two averages without a standard deviation for both sample...

    Started by utoledoboi‎, 05-10-2012 09:59 PM
    • Replies: 7
    • Views: 2,025
    05-11-2012, 03:38 PM Go to last post
  20. Red face How to test significance on one sample rating for >1 variables (ie 2 or 3 brands)?

    Hi all, This is for application in market research... Suppose that I interview 100 people randomly regarding their opinions on Republicans and...

    Started by thehiggsboson‎, 05-17-2012 04:38 AM
    • Replies: 7
    • Views: 1,784
    05-18-2012, 04:46 AM Go to last post
  21. Normal distribution and population data

    A question of more general nature: If i'm working with population data (i.e., not a sample from a larger population), to what extent should i care...

    Started by stuser‎, 05-19-2012 01:39 PM
    • Replies: 7
    • Views: 1,889
    05-20-2012, 11:28 AM Go to last post
  22. Weighted Performance Ranking

    Hello! I have 1200 accounts that need to be ranked against one another according to performance across 12 different key performance indicators. ...

    Started by derekbooth‎, 05-25-2012 06:18 PM
    • Replies: 7
    • Views: 2,951
    05-27-2012, 03:14 PM Go to last post
  23. Basic Expectation

    hi guys, this problem looks simple but tricky. give it a try. Q. Suppose X1 and X2 are real-valued random variables with f as their common...

    Started by RoX@r‎, 05-28-2012 11:29 AM
    • Replies: 7
    • Views: 2,231
    05-28-2012, 01:20 PM Go to last post
  24. Poisson Regression and Cost data?

    Hello all, I am working with cost data based on a number of variables as well as population size. I know that poisson regression is used with...

    Started by lancearmstrong1313‎, 06-29-2012 01:35 PM
    • Replies: 7
    • Views: 4,053
    07-02-2012, 09:58 AM Go to last post
  25. Question Why degrees of freedom=0 for Hosmer–Lemeshow test?

    As part of some research for my dissertation I ran a multiple logistic regression. I was left with a regression model with only one predictor...

    Started by Clairept‎, 07-28-2012 11:02 AM
    • Replies: 7
    • Views: 98,234
    07-28-2012, 07:57 PM Go to last post
  26. Using the proper statistical term in reports

    Hello everyone, I am writing up a report now for my end of block assessment, and my supervisor told me that I need to use the proper "statistic...

    Started by s0899XX2‎, 08-13-2012 06:59 AM
    • Replies: 7
    • Views: 1,902
    08-13-2012, 05:11 PM Go to last post
  27. How to determine how 'unusual' a value is within a sample

    I have a question about which sort of statistical analysis is required, and how to go about it, for the following situation. Basically, I've...

    Started by clcochrane‎, 08-15-2012 04:10 PM
    • Replies: 7
    • Views: 22,950
    08-23-2012, 01:42 PM Go to last post
  28. Integration of a standard error

    Hi there, I have performed linear regression on my data using sigma plot. My specific interest is in the area underneath the regressed curve....

    Started by ukhan1‎, 08-21-2012 02:24 PM
    • Replies: 7
    • Views: 760
    08-21-2012, 03:42 PM Go to last post
  29. F-test equality coefficients same model

    Hi, I have binary logistic model with only binary independent variables (which were originally 3 multi-valued nominal variables). For example,...

    Started by damirv‎, 08-24-2012 11:06 AM
    equality coefficients, logisitic regression
    • Replies: 7
    • Views: 5,338
    08-26-2012, 06:53 AM Go to last post
  30. Binomial test to determine if one animal is following another.

    Hi all, I have a number of videos showing two species of animals arriving at a resource and I want to determine if species 2 is following species...

    Started by killbot2000‎, 08-27-2012 05:59 AM
    • Replies: 7
    • Views: 1,941
    09-03-2012, 10:58 AM Go to last post
  31. Maximum likelihood estimator - geometric distribution

    Need help getting the MLE. Problem defines the geometric distribution as pi(1-pi)^y

    Started by wren‎, 08-28-2012 09:04 PM
    • Replies: 7
    • Views: 4,158
    08-28-2012, 10:32 PM Go to last post
  32. Determining Minimum Sample Size To Accurately Reflect Original Distribution

    Hi, I have an intensive computer simulation and i'm looking for a way to save some time! In the simulation, i run a given model (of which there...

    Started by jammiey2k3‎, 08-31-2012 07:40 AM
    • Replies: 7
    • Views: 1,833
    09-02-2012, 04:13 PM Go to last post
  33. Is one-way anova appropriate test

    Hello everyone, I have to determine if there is the difference in energy consumption between four equipment operators. Is the one way anova...

    Started by White81‎, 09-06-2012 05:08 PM
    • Replies: 7
    • Views: 2,132
    09-07-2012, 12:50 PM Go to last post
  34. Minimum sample size for paired t-tests

    Hi All, I remember reading somewhere that the minimum sample size to conduct paired t-tests was ~30, as this will ensure that there is adequate...

    Started by bozatron‎, 09-18-2012 09:49 PM
    • Replies: 7
    • Views: 19,702
    09-23-2012, 12:48 AM Go to last post
  35. R question

    Any suggestions to find a formula relating R-square and the F-test for regression.

    Started by Snowy88‎, 09-21-2012 05:17 PM
    • Replies: 7
    • Views: 3,070
    09-22-2012, 09:21 AM Go to last post
  36. Correlation Question w 3 variables

    Can someone please tell me how it is possible for X to be correlated with Y and Z to be correlated with Y, but X and Z be uncorrelated? I'm having...

    Started by yakonomica‎, 09-23-2012 10:38 AM
    • Replies: 7
    • Views: 2,285
    09-24-2012, 06:10 PM Go to last post
  37. Some Help

    Please. I keep calculating this on my TI84 and the calculator keeps reading error. Just wondering what I might be doing wrong?

    Started by PSG‎, 09-25-2012 09:57 PM
    • Replies: 7
    • Views: 2,290
    09-25-2012, 11:25 PM Go to last post
  38. Interpreting Confidence Intervals

    Hey everyone. I am trying to answer a question on my homework. If the confidence intervals are both negative (i.e. the lower and upper bound) then do...

    Started by JoeHall‎, 09-26-2012 07:46 AM
    • Replies: 7
    • Views: 3,798
    09-26-2012, 08:29 PM Go to last post
  39. Calculating the residual?

    Hello, Based on the attached picture, I am supposed to calculate B1(hat) and B0(hat), which I have done successfully. B1(hat) = 0.451 and...

    Started by Walowizard‎, 10-14-2012 08:42 PM
    • Replies: 7
    • Views: 2,414
    10-14-2012, 10:26 PM Go to last post
  40. Using Hypothesis test for decision making - find if sample represents the population

    Hi All, I work with an NGO and we have a telemarketing department which purchases phone number databases for calling and marketing our cause. We...

    Started by shivapps‎, 10-18-2012 12:12 AM
    • Replies: 7
    • Views: 2,766
    10-19-2012, 05:44 AM Go to last post
  41. Application Specific: Strange behaviour of students T-test compared to std.dev plots

    Hello all, ******************************************************************** SEE THE FITH POST OF THIS THREAD TO GET A BETTER IDEA OF THE ISSUE...

    Started by ngio‎, 11-20-2012 12:15 PM
    • Replies: 7
    • Views: 1,731
    11-22-2012, 01:50 PM Go to last post
  42. Kruskal Wallis or One way analysis of variance- which is more suitable?

    Hello, I am currently working on an assignment which describes 2 clinical trial scenarios. I will outline both first: 1)Compare the...

    Started by StudiousEm‎, 11-23-2012 05:43 PM
    • Replies: 7
    • Views: 1,622
    11-24-2012, 01:59 PM Go to last post
  43. Non normality in residuals in SLR

    Hey guys. I've done a SLR and after testing the residuals for normality using the Shapiro-Wilk test and I've learned that the residuals are not...

    Started by starpen‎, 12-12-2012 03:05 PM
    normality, residuals, slr, wilk
    • Replies: 7
    • Views: 2,295
    12-13-2012, 03:26 AM Go to last post
  44. Statistical analysis of Profits - use of U-test

    Hi We have been working on a project where we have 2 or more trading agents on a market stock and for the outcome we have the profits that each...

    Started by ozamarripa‎, 12-07-2012 01:37 PM
    confidence interval, profits, statistical analysis, u-test
    • Replies: 7
    • Views: 2,010
    12-08-2012, 03:12 AM Go to last post
  45. Likert items-->Likert scale-->analysis

    I'm working on a research project trying to identify motivation types and self-identity changes of the participants. Then I have to do group...

    Started by btomatoe‎, 12-17-2012 02:21 AM
    • Replies: 7
    • Views: 1,761
    12-17-2012, 06:25 PM Go to last post
  46. Correlation

    Hi, I've two monthly datasets: The first , the Percentage of people who intend to buy a house within the next 6 months (for example in December it...

    Started by GIS‎, 12-27-2012 09:13 AM
    • Replies: 7
    • Views: 2,054
    01-01-2013, 03:34 AM Go to last post
  47. Statistics- Confidence Interval Estimator

    I have a question which I am stuck on. I have tried to solve it but am quite wary if I am heading in the right direction. The question is as follows:...

    Started by Kev007‎, 01-23-2013 08:30 AM
    • Replies: 7
    • Views: 2,368
    01-24-2013, 11:39 AM Go to last post
  48. How to calculate significant differences

    Hi Everyone.. I am stuck on one of my assignment questions. I have two samples, let's say List of employees in one Department A each with an...

    Started by Richard.Chambula‎, 01-22-2013 10:34 PM
    significant differences
    • Replies: 7
    • Views: 2,718
    01-23-2013, 12:55 PM Go to last post
  49. Most wins over time

    Hey, I am not very good at stats, but I have a question. Statistically speaking, if you could create a draw, with whatever amount of tickets...

    Started by statsp‎, 01-13-2013 03:09 PM
    stats, win
    • Replies: 7
    • Views: 1,908
    01-13-2013, 07:14 PM Go to last post
  50. Compare 2 tests and choose the one that provide more results

    Hi , I have 2 tests, one will give me results for more cases (80%-90%) and another test will give me some results (60%-70%). How can I say or prove...

    Started by tnaser‎, 12-30-2012 02:37 PM
    • Replies: 7
    • Views: 2,427
    01-01-2013, 06:06 PM Go to last post
  51. The number of people in the US measured by the Census

    The number of people in the U.S. as measured by the U.S.Census is a ? There are a few choices: In my opinion, it is either (B)...

    Started by nobrainer612‎, 12-24-2012 10:31 PM
    • Replies: 7
    • Views: 1,930
    12-25-2012, 01:52 AM Go to last post
  52. Geometric trends linear estimation

    The following records are available for a parameter \Phi \begin{tabular}{|c|c|c|c|} \hline Year & $\Phi$ & Year & $\Phi$ \\ \hline 1989 &...

    Started by keyhs‎, 02-28-2013 07:55 AM
    • Replies: 7
    • Views: 1,554
    03-03-2013, 09:18 AM Go to last post
  53. Skewed Continuous Predictor - dichotomize or treat as continuous?

    Hello All, I have two scales with 7 binary items. The simple raw scores from these scales (summing the item responses of 0 or 1) are very skewed...

    Started by katie25‎, 02-28-2013 10:13 AM
    continuous iv, dichotomous iv, skewness
    • Replies: 7
    • Views: 3,426
    02-28-2013, 03:46 PM Go to last post
  54. Central limit theorem and statistical process control

    Hello I have a question...according to the central limit theorem, we say that if I have a sample X1,...,Xn, and if it's not necessarily normally...

    Started by Yankel‎, 01-29-2013 04:09 AM
    • Replies: 7
    • Views: 2,076
    01-29-2013, 03:42 PM Go to last post
  55. Post Absolute beginner needs help deciphering question

    Hi there. I am an absolute novice to statistics, and have had no formal education in it since year 9 at school when we did box-plot diagrams. I...

    Started by Mortson‎, 02-22-2013 02:05 PM
    • Replies: 7
    • Views: 1,485
    02-22-2013, 06:06 PM Go to last post
  56. Smile measures of variation

    An instructor compared two teaching techniques to see which was most successful in reaching the students. Results of the experimental and control...

    Started by tdking‎, 02-22-2013 02:07 PM
    • Replies: 7
    • Views: 1,556
    02-22-2013, 03:22 PM Go to last post
  57. t-Test help: Two-Sample - Difference between assuming equal vs. unequal variances?

    Hello all, I'm needing some help here. I'm trying to figure out whether or not my statistics problem would use the "t-Test: Two-Sample...

    Started by bryan‎, 01-24-2013 02:31 PM
    • Replies: 7
    • Views: 76,184
    01-25-2013, 01:15 AM Go to last post
  58. planned comparison (post hoc) with fewer than 3 groups?

    Say you've found that the IV "sex" has a significant effect on your DV, but you want to know the nature of that effect. If your IV were something...

    Started by mjgray‎, 02-25-2013 03:11 PM
    anova, gender identity, groups, post hoc tet, sex
    • Replies: 7
    • Views: 2,460
    02-28-2013, 03:44 PM Go to last post
  59. Sample Size and Chi-Square Goodnes-of-Fit Test

    Hello. New member here and I have a question for the group. When computing the Chi-Square test statistic in the Chi-Square Goodness-of-Fit...

    Started by Vypa‎, 01-29-2013 11:16 AM
    • Replies: 7
    • Views: 2,519
    01-29-2013, 01:51 PM Go to last post
  60. T-Test with Chi-Square

    Is the t-test always used with chi-square?

    Started by TheStatProf‎, 02-26-2013 11:48 AM
    chi-square, t-test
    • Replies: 7
    • Views: 1,708
    02-26-2013, 10:18 PM Go to last post

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