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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: 196,982
    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: 66,868
    09-30-2005, 09:44 AM Go to last post
  1. Target Distribution

    Hello, This is my first post. I'm a elementary math teacher who likes to look at scores to find some deeper truth about mine and my students'...

    Started by jsraadt‎, 12-14-2014 05:02 PM
    • Replies: 14
    • Views: 2,067
    12-16-2014, 07:41 AM Go to last post
  2. Standard deviation and sample size

    Hi. I have no background on statistics, so please just go down to fundamental for me. But here are some basic questions about statistics and standard...

    Started by risingstar3110‎, 12-03-2014 10:26 PM
    model, precision
    • Replies: 12
    • Views: 4,114
    12-16-2014, 05:52 AM Go to last post
  3. Plugins to write in statistiscal notation in Wordpress sites

    Hello, What plugins do you recommend to write statistical notation in Wordpress sites ? Thank you

    Started by pjssms‎, 12-15-2014 06:21 PM
    • Replies: 0
    • Views: 1,515
    12-15-2014, 06:21 PM Go to last post
  4. Which inferential test?

    Hello, The hereunder is an exercise I have to complete. I am having issues with answering questions. Study: Researchers were interested in...

    Started by treviswild‎, 12-14-2014 05:44 PM
    inferential test
    • Replies: 4
    • Views: 3,184
    12-15-2014, 02:19 PM Go to last post
  5. Trying to strenghten validity of sample

    Hi, this is my second post in this forum (the first one in the new member thread). I am turning to this thread in hope for getting some advice on...

    Started by Becky1‎, 12-14-2014 04:33 PM
    • Replies: 4
    • Views: 1,931
    12-15-2014, 04:42 AM Go to last post
  6. degrees of freedom in ANCOVA?

    So we were given this problem: Parasites are energetically expensive and can have both sub-lethal and lethal effects on snails (the hosts). To test...

    Started by nshrkat‎, 12-14-2014 02:54 PM
    • Replies: 0
    • Views: 4,029
    12-14-2014, 02:54 PM Go to last post
  7. How to calculate sample size manually ?

    Hello If My Confidence Level = 95% Margin of error = 5% Number of observation = 211 How can i calculate the sample size ? Can someone...

    Started by hanialbarni‎, 12-14-2014 03:02 AM
    • Replies: 2
    • Views: 2,565
    12-14-2014, 11:40 AM Go to last post
  8. Which analysis to take

    Hello I strugle with the question which analysis I have to take. I ve got 2 categorical ordered data eg. frequencies of bad moods: never, 1 to 3...

    Started by roger20‎, 12-13-2014 06:20 PM
    • Replies: 1
    • Views: 1,332
    12-14-2014, 04:13 AM Go to last post
  9. Question The z-scores of the 68-95-99.7 rule aren't matching up with the values in my z-table

    The z-scores from the 68-95-99.7 rule, which are 1, 1.96 (or 2), and 3 according to my textbook, arent matching up with the values i get if i try to...

    Started by Psyclone‎, 12-13-2014 11:29 PM
    standard deviation, z-score, z-table
    • Replies: 2
    • Views: 7,156
    12-13-2014, 11:39 PM Go to last post
  10. Trend Analysis: Mann Kendall

    I doing trend analysis on rainfall using mann-kendall. I have daily rainfall data for 60 years. My p value is close to 0 which indicates that...

    Started by prakritinaswa‎, 01-30-2014 12:21 AM
    • Replies: 1
    • Views: 2,862
    12-13-2014, 04:57 PM Go to last post
  11. help!! I have a test and none of this makes sense.

    Hello! I have an exam on inferential statistics, etc and need serious help.

    Started by ashleyw‎, 12-12-2014 08:55 PM
    • Replies: 2
    • Views: 1,053
    12-13-2014, 08:25 AM Go to last post
  12. Nested Case Control Study

    Hi, I have 195 cases and I want to find 4 randomly controls. Can I use propensity score matching to find controls matched to the cases? ...

    Started by biscodyl‎, 12-13-2014 06:46 AM
    case control; matched
    • Replies: 0
    • Views: 1,195
    12-13-2014, 06:46 AM Go to last post
  13. Research Help!

    Hi all. What is the appropriate statistical test for comparing two seperate groups who's data is independent from one another? Different people in...

    Started by vyelence‎, 12-11-2014 09:54 PM
    • Replies: 3
    • Views: 1,563
    12-12-2014, 05:31 PM Go to last post
  14. Regular or paired t-test?

    I need to compare results of running an air dispersion software at different scenarios (varying in the amount of the dispersed material) for 6...

    Started by Scrooge‎, 12-12-2014 12:03 PM
    • Replies: 3
    • Views: 1,400
    12-12-2014, 02:43 PM Go to last post
  15. Wilcoxon and Mann-Whitney Test

    Hello, I need to do one of these two statistical tests, I have a database on the consumption of fuel rods in each of the regions of my country,...

    Started by askazy‎, 12-11-2014 07:11 AM
    • Replies: 14
    • Views: 2,216
    12-12-2014, 01:21 PM Go to last post
  16. Expected Value of Y = max (X1, X2, X3, .... , Xn)

    I'm having a hard time figuring out what the expected value of Y = max(X1, X2, X3, ... , Xn) with pdf (x;θ) = 2x/θ^2. So it is the nth value of order...

    Started by Shunichi‎, 12-11-2014 09:57 PM
    expected value, order statistics
    • Replies: 1
    • Views: 5,499
    12-11-2014, 11:34 PM Go to last post
  17. Comparing Groups 2 sample T-test or Anova

    So I have a word problem that I can't get my head around. Perhaps because the wording of the question is leading me down the wrong path about the...

    Started by KennyC‎, 12-11-2014 02:13 PM
    anova, comparing groups, t-test, word problems
    • Replies: 3
    • Views: 1,794
    12-11-2014, 03:21 PM Go to last post
  18. Databases

    I have been asked to develop a universal data base to house all of our company's wildlife survey data that is currently housed in Excel files. We...

    Started by dynamicwildlife‎, 12-11-2014 10:21 AM
    • Replies: 2
    • Views: 891
    12-11-2014, 11:46 AM Go to last post
  19. How to calculate? Gretagarbo?

    Hi, I'm a doctor and conducting a huge study for Pfizer. Now all the data is collected and i'm trying to make statistical calculations. Total...

    Started by drgunnar‎, 12-11-2014 07:54 AM
    • Replies: 1
    • Views: 1,246
    12-11-2014, 09:01 AM Go to last post
  20. Standard deviation of two sets from only individual set descriptive statistics

    I have two sets of numbers and I have access to their averages and standard deviations. However, I do not have easy access to the actual numbers...

    Started by abakshi‎, 12-10-2014 02:32 PM
    • Replies: 2
    • Views: 1,308
    12-11-2014, 08:22 AM Go to last post
  21. [Checking/Help] Hypothesis Testing and Chi-squared Test

    Hi there, I have two questions that need to be submitted online, and was hoping someone could check my answers before I submit them. Question 1...

    Started by TaylorC‎, 12-07-2014 09:57 AM
    • Replies: 13
    • Views: 1,868
    12-11-2014, 05:31 AM Go to last post
  22. Question What type of curve is this?

    The left one is a logistic curve / sigmoid function e.g. y=1 / 1+exp(-bx) What would be the typical name for the curve on the right / typical...

    Started by yccmp‎, 12-10-2014 11:33 PM
    curves, logistic, regression model
    • Replies: 1
    • Views: 941
    12-11-2014, 03:29 AM Go to last post
  23. Confidence interval conceptual question

    Why is creating a confidence interval not a viable alternative to a chi-square or an ANOVA? I'm guessing it's because a CI can't give more...

    Started by Zebo‎, 12-11-2014 12:01 AM
    • Replies: 0
    • Views: 1,257
    12-11-2014, 12:01 AM Go to last post
  24. How to compare if two sets data are the same

    I'm trying to compare measurements that I took to measurements that someone else took on the same exact things. Im trying to see if they are...

    Started by Biology‎, 12-10-2014 06:21 PM
    • Replies: 4
    • Views: 1,528
    12-10-2014, 07:51 PM Go to last post
  25. Do statisticians often work with scientific experiments?

    I don't know anything about statistics(or life or anything)... anyway, I am interested in knowing how statistics ties into the scientific method. ...

    Started by Imacreep‎, 12-10-2014 02:58 PM
    scientific method
    • Replies: 0
    • Views: 968
    12-10-2014, 02:58 PM Go to last post
  26. Multiplying two normal distributions

    Hello, This problem involves an interference fit problem in engineering. In an interference fit one part is pressed into another part. One of the...

    Started by ilikeshirt‎, 12-10-2014 09:38 AM
    • Replies: 4
    • Views: 1,860
    12-10-2014, 02:23 PM Go to last post
  27. Required sample size to distinguish means of two binomially distributed rv

    Hello, Currently trying to work out the best way to calculate the number of samples that would be required to get a certain confidence interval. ...

    Started by s0medave‎, 12-10-2014 01:18 PM
    binomial, distinguishing means, inverse t-test, t-test
    • Replies: 0
    • Views: 785
    12-10-2014, 01:18 PM Go to last post
  28. What is the best descriptive stats to present this data

    I have a table where the major categories are on the columns and they total to 100% for each column. Then the subcategories are on the rows and each...

    Started by emekadavid‎, 12-07-2014 03:43 PM
    descriptive statistics
    • Replies: 2
    • Views: 2,408
    12-10-2014, 05:41 AM Go to last post
  29. help w/ anova test selection & factors (groups)

    Hello there. Stats noob here I'm an IT major so apparently stays is required for me. I have an assignment here and one of the questions is really...

    Started by theblackdog‎, 12-10-2014 03:13 AM
    2-way anova, 2-way repeated measures, anova
    • Replies: 0
    • Views: 1,210
    12-10-2014, 03:13 AM Go to last post
  30. Pass Rate Calculation for Multi-tiered Tests

    Hello, I am working on a project in an educational setting that requires individuals to complete multiple tests. In particular, an individual must...

    Started by markb1‎, 12-09-2014 07:30 PM
    • Replies: 0
    • Views: 2,111
    12-09-2014, 07:30 PM Go to last post
  31. Can Z, t, and chi square critical values be either positive or negative?

    As the question states. I thought it might be possible for a z and t because of the two tails in a normal distribution. Not sure about chi because...

    Started by joestats‎, 12-09-2014 04:16 PM
    • Replies: 2
    • Views: 2,720
    12-09-2014, 07:17 PM Go to last post
  32. Choosing alpha for Pearson's correlations

    Does anyone know of any good references that discuss how to choose alpha for a Pearson's correlation?

    Started by Phdstudentz‎, 12-08-2014 04:35 PM
    • Replies: 10
    • Views: 1,838
    12-09-2014, 04:48 PM Go to last post
  33. Multiple imputation on categorical (dummy coded) data

    Hello, I have a question regarding multiple imputation for categorical variables, and hope very much that someone can answer me. I am using SPSS...

    Started by Sabine‎, 12-09-2014 09:56 AM
    multiple imputation, regression analysis
    • Replies: 0
    • Views: 2,119
    12-09-2014, 09:56 AM Go to last post
  34. Some confuse about Regression Model(with example)

    I am a college student who has studied basic statistics. Recently, i have read a paper which call "Creating a Profitable Betting Strategy for...

    Started by anovatable‎, 12-09-2014 05:40 AM
    • Replies: 0
    • Views: 1,191
    12-09-2014, 05:40 AM Go to last post
  35. Stepwise regression model with dependent variable categorical (help)

    Hello , Can I use the step wise regression model with a categorical dependent variable? Is coding the dependent variable as 0 or 1 is enough to...

    Started by tarekshah‎, 12-08-2014 03:07 PM
    regression analysis
    • Replies: 7
    • Views: 1,469
    12-08-2014, 05:54 PM Go to last post
  36. Help with model Matrix GLM

    Hey guys been browsing the forums for a while, and usually find what I need! This is a tad more specific though so Ive made an account!! I've been...

    Started by Tomos‎, 12-08-2014 05:38 PM
    • Replies: 0
    • Views: 1,167
    12-08-2014, 05:38 PM Go to last post
  37. Least square line of best fit

    I am looking for a references for the least square line of best fit. Preferably a journal paper. Thanks!

    Started by Phdstudentz‎, 10-15-2014 09:59 AM
    • Replies: 3
    • Views: 1,421
    12-08-2014, 04:41 PM Go to last post
  38. Strugling with Ttests

    Hi everyone, This is my first post on this forum. I'm on a Sports science course and during a practical we had each participant measure their...

    Started by Rexkid‎, 12-07-2014 11:06 AM
    • Replies: 5
    • Views: 1,579
    12-08-2014, 06:37 AM Go to last post
  39. importing data in spss

    i have my stress questionnaire with the side heading of 6 each side heading containing 10 questions totally 60 questions are there. how should i...

    Started by priyamaha2010‎, 12-08-2014 05:03 AM
    • Replies: 2
    • Views: 1,376
    12-08-2014, 05:17 AM Go to last post
  40. What is the difference between factor and cluster analysis

    Can you please explain me the difference between those 2- cluster and factor analysis. And if you can please give me a simple example to reinforce...

    Started by Kie27‎, 12-07-2014 12:06 PM
    • Replies: 1
    • Views: 2,456
    12-08-2014, 02:59 AM Go to last post
  41. Forecasting the future gallup poll results - what methods should be used?

    Hello guys, My first post in TalkStats. Lately I have been interested in politics. It has been few years since my statistics studies and therefore...

    Started by hesber‎, 12-07-2014 07:20 PM
    • Replies: 0
    • Views: 1,118
    12-07-2014, 07:20 PM Go to last post
  42. Right closed or left closed histograms

    What difference does it make if histograms are right closed (left open) or left closed (right open). Please, someone do help me?

    Started by emekadavid‎, 11-25-2014 02:10 PM
    histogram
    • Replies: 9
    • Views: 2,452
    12-07-2014, 05:34 PM Go to last post
  43. How to start this problem? Factor analysis?

    I am not sure what statistical test to use here. Should I start form factor analysis? Data on concentrations of 13 different chemicals in wine...

    Started by Kie27‎, 12-07-2014 09:51 AM
    • Replies: 2
    • Views: 1,489
    12-07-2014, 10:44 AM Go to last post
  44. Question on Mean, SD and SEM

    A professor has a sample of 500 subjects. The mean is 40, median is 20, range 10-100. a. Could this professor calculate a useful interval with...

    Started by amtrip‎, 12-06-2014 11:59 PM
    • Replies: 1
    • Views: 2,171
    12-07-2014, 01:48 AM Go to last post
  45. Please help to choose appropriate statistical analysis for the following problem

    I need to hypothetically propose the best statistical analysis for the following problem? Any ideas? If you do, can you please give rationale. Thank...

    Started by Kie27‎, 12-06-2014 12:29 AM
    • Replies: 3
    • Views: 2,144
    12-06-2014, 08:20 PM Go to last post
  46. Cox model: covariates and likelihood function

    Hi everyone, I study maths but I am dealing with the cox regression model, given by the equation h(t)=h_0(t) exp{b_1X_1+...+b_nX_n} but I could not...

    Started by viv‎, 12-06-2014 10:36 AM
    • Replies: 0
    • Views: 1,175
    12-06-2014, 10:36 AM Go to last post
  47. how to adjust economic value for financial crisis?

    Hi all On the beginning, I would like to say that I'm newbie in econometrics. However, I've been asked for preparing Chow test to check if there...

    Started by mysje_hood‎, 12-06-2014 08:57 AM
    • Replies: 0
    • Views: 1,038
    12-06-2014, 08:57 AM Go to last post
  48. Statistical Significance - Two Independent Means Aggregate Data

    Hi, I'm trying to determine whether the lift in revenue / impression between two ads is statistically significant. The data is aggregated and...

    Started by jessekanclerz‎, 12-05-2014 04:57 PM
    • Replies: 1
    • Views: 1,380
    12-06-2014, 05:44 AM Go to last post
  49. Intro Stats - 3 Part Question

    Hi, I'm first year stats and have just found your forum. I am not sure about the wording of this question. I'm wondering if it is throwing me off...

    Started by Statsamazing‎, 12-03-2014 04:38 AM
    • Replies: 4
    • Views: 1,344
    12-05-2014, 07:55 AM Go to last post
  50. how to calculate effect size for 4 people :)

    Hi, Let's say I have group X (treatment) and O (control). In group X: person A: pretest :15 postest: 20 person B: pretest: 14-postest:18 ...

    Started by bernardpar‎, 12-05-2014 02:48 AM
    • Replies: 0
    • Views: 1,206
    12-05-2014, 02:48 AM Go to last post
  51. Is it true that factor values are the eigenvalues of the factors?

    I wonder whether it is Is it true that factor values are the eigenvalues of the factors? I tried to find what factor value is but I can't find it....

    Started by cara‎, 12-04-2014 05:30 PM
    • Replies: 2
    • Views: 1,098
    12-05-2014, 02:38 AM Go to last post
  52. Help with standard deviation calculations, please?

    Hello, I am taking an online statistics class and having trouble with this chapter's homework. The following question has nine parts. I have...

    Started by mmarcelis‎, 12-04-2014 10:18 PM
    • Replies: 0
    • Views: 2,581
    12-04-2014, 10:18 PM Go to last post
  53. What statistical calculation to use and which R function?

    Here's the data I have... I have a "national" sample (the control) showing the actual number and percentage of people in the sample that have a...

    Started by jonmrich‎, 12-04-2014 03:18 PM
    chi sq test, contingency table
    • Replies: 1
    • Views: 1,669
    12-04-2014, 04:07 PM Go to last post
  54. Question on power analysis/interpretation when sample size is lower than recommended

    A friend of mine in med school asked if I could comment on a study his team ran since I have a little bit of a background in statistics, but to be...

    Started by stilllearning‎, 06-19-2014 10:35 AM
    • Replies: 2
    • Views: 1,628
    12-04-2014, 11:09 AM Go to last post
  55. Exclamation Find if additional value is significantly different among a group

    I'm trying to determine if an additional number's difference among the mean is statistically significant. Let's say for example, I have: SET_A = ...

    Started by ilovepython‎, 12-03-2014 02:46 PM
    • Replies: 2
    • Views: 1,051
    12-03-2014, 03:19 PM Go to last post
  56. How often one distribution is larger than another

    Say you have two distributions: DISTRIBUTION 1: Average: 200 Standard Deviation: 40 DISTRIBUTION 2: Average: 190 Standard Deviation: 37

    Started by StatsHelpWanted‎, 12-03-2014 12:02 AM
    • Replies: 4
    • Views: 2,096
    12-03-2014, 02:31 PM Go to last post
  57. Which test: dichotomous and ordinal variables

    I'm really starting to get peeved with different interpretations of which statistical test to use. I have two variables that I'll illustrate ...

    Started by natenator‎, 12-01-2014 04:01 PM
    • Replies: 6
    • Views: 2,588
    12-03-2014, 10:26 AM Go to last post
  58. Using sample proportion to construct standard error?

    Hi All, In my stats book, we are told that to construct the standard error of your sample proportion (p(1-p)/n)^.5, you can just replace p with...

    Started by Salohcin‎, 12-03-2014 08:17 AM
    • Replies: 0
    • Views: 978
    12-03-2014, 08:17 AM Go to last post
  59. Stats help Urgent!!

    Hello, I have an assignment due tomorrow and i can't seem to figure out this question. Question 1: Carlinville, Illinois, has just started an...

    Started by supehrdrew‎, 12-02-2014 05:26 PM
    • Replies: 10
    • Views: 2,804
    12-02-2014, 11:53 PM Go to last post
  60. Number of sample mean for normal distribtiion & matrix in linear regression

    1. By Central Limit Theorem (CLT) , the sample mean will have an approximately normal distribution (even though the population is not normally...

    Started by lkwokchu‎, 12-02-2014 03:38 AM
    • Replies: 3
    • Views: 1,895
    12-02-2014, 11:28 PM Go to last post

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