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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: 196,665
    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: 66,688
    09-30-2005, 09:44 AM Go to last post
  1. Temperature vs Concrete Cure Time

    Hello, I have a reasonable sized data set of concrete cure times and the average temperature when the pour was done. What I am trying to do is...

    Started by rwoolley‎, 03-27-2008 12:00 PM
    • Replies: 2
    • Views: 6,031
    11-12-2012, 03:45 PM Go to last post
  2. non-parametric tests and post-hoc analysis

    Hi. I have the following problem: I have a set of data coming from 5 different ventilators, tested in a bench study. Different variables (insp...

    Started by checco76‎, 11-12-2012 01:44 PM
    • Replies: 0
    • Views: 1,760
    11-12-2012, 01:44 PM Go to last post
  3. Comparing compression strength of chocolates

    Hey there, Im currently working on a project to compare the compression strength of chocolates with different inside filling (caramel, nuts,...

    Started by thefoler‎, 11-11-2012 07:12 PM
    • Replies: 4
    • Views: 1,998
    11-12-2012, 09:33 AM Go to last post
  4. (Binominal proportions) confidence interval – which formula to use?

    Hey, I got a quick question regarding confidence intervals. For a Rasch analysis I have to perform independent t-tests (it’s done to check for...

    Started by Tool7‎, 11-09-2012 04:59 AM
    confidence interval
    • Replies: 2
    • Views: 26,860
    11-12-2012, 06:30 AM Go to last post
  5. Confidence Intervals

    I am totally lost about this problem, so I had to motivation to create an account. Could someone please help me out? Thank you so much! ...

    Started by windycloud‎, 11-11-2012 09:22 PM
    • Replies: 1
    • Views: 1,578
    11-11-2012, 09:42 PM Go to last post
  6. Anova or mixed model, and is non-orthogonality a problem?

    Hello, I am trying to test whether the following variables affect likelihood of visits by squirrels to feeding stations: Distance of feeder...

    Started by lkay‎, 11-08-2012 11:53 AM
    • Replies: 8
    • Views: 2,166
    11-11-2012, 05:31 PM Go to last post
  7. Question about EV sum SE sum.

    1. The average weight of people is known to closely follow a normal curve. Suppose the average weight of 3,000 people is 150 lbs, with an SD of 10...

    Started by windycloud‎, 11-11-2012 04:31 PM
    • Replies: 0
    • Views: 2,544
    11-11-2012, 04:31 PM Go to last post
  8. creating a composite variable?

    I am a student doing my master's thesis and I have a question regarding my study. I am working with country data for 25 countries and I am looking...

    Started by vtodorov‎, 11-11-2012 11:30 AM
    composite, compute, transform, variable
    • Replies: 0
    • Views: 2,500
    11-11-2012, 11:30 AM Go to last post
  9. Using a large constant value for a log transformation of data with zeros

    I have a rather large data set, positively skewed. I'm using a log transformation, but there are quite a few zeros in my data since the data is time...

    Started by setsun0r‎, 11-09-2012 07:59 PM
    • Replies: 3
    • Views: 2,421
    11-11-2012, 10:23 AM Go to last post
  10. How derive joint distribution of x1, x2, x3, sum(xi) following poisson disribution?

    At first, i try to solve the problem, "Let X1, X2, ,,, Xn be a random sample from a Poisson distribution with mean theta. find the conditional...

    Started by Yihyunsoo‎, 11-11-2012 06:16 AM
    • Replies: 1
    • Views: 4,688
    11-11-2012, 06:47 AM Go to last post
  11. Line of Best Fit and R Value contradict

    Hi, I'm fairly new to statistics and am wondering whether it is normal for the Line of Best fit and R value to contradict each other? As I was under...

    Started by James73‎, 11-10-2012 07:26 PM
    • Replies: 6
    • Views: 2,888
    11-11-2012, 05:19 AM Go to last post
  12. Different correlation coefficients

    How can i compare the results determined by different correlation coefficients between different type of variables? Two of the three variables are...

    Started by denizgul‎, 11-11-2012 05:17 AM
    correlation coefficients
    • Replies: 0
    • Views: 1,489
    11-11-2012, 05:17 AM Go to last post
  13. Interaction effects, distributions not normal- is ANOVA justified??

    Hi! I have a 2*4*6 factorial design. the sample distributions in most cases are NOT normal (tested with Kolmogorov-Smirnof test). It is...

    Started by knedlica‎, 11-02-2012 07:20 AM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 7,192
    11-11-2012, 03:53 AM Go to last post
  14. Multiple Comparison Procedure hw- which is best?

    If there are 4 independent groups of 7 subjects each, which multiple comparison procedure is best to achieve maximum power while maintaining...

    Started by g0422‎, 11-11-2012 02:21 AM
    • Replies: 0
    • Views: 1,112
    11-11-2012, 02:21 AM Go to last post
  15. Post Lin Regression: Need help predicting y from R and x= mean + 1.5 standard deviation

    Hi, I have the following linear regression problem "For r = .60 and a x that is 1.5 standard deviations above the mean x, I expect a dependent...

    Started by lisawils‎, 11-10-2012 03:41 PM
    correlation, regression
    • Replies: 1
    • Views: 916
    11-10-2012, 04:08 PM Go to last post
  16. multivariate regression in stata

    Hello, can i use xtfmb.ado in stata to make famamacbeth regression where i regress dependent variable on multiple independent variables? if so,...

    Started by gihan‎, 11-10-2012 03:05 PM
    • Replies: 0
    • Views: 1,649
    11-10-2012, 03:05 PM Go to last post
  17. Using Minitab to test Null hypothesis of two population variance

    Hey guys, 3 weeks ago I came across a problem that stumped me for my statistics course I'm enrolled in, and you were all so helpful I had to come...

    Started by renaissanceman87‎, 11-09-2012 03:03 PM
    • Replies: 2
    • Views: 1,767
    11-09-2012, 03:21 PM Go to last post
  18. How best to test for normality with small samples?

    I am running ANOVAs and ANCOVAs on small samples (N1=16, N2=32) and need to determine whether my data are normally distributed. I am unclear on two...

    Started by Neophyte‎, 11-09-2012 11:23 AM
    • Replies: 2
    • Views: 1,065
    11-09-2012, 02:36 PM Go to last post
  19. expectation between two variables

    Hey guys, Stuck on a question and hoped someone could see it easier than I am currently. I was asked to caculated an expectation (as part of a...

    Started by Link‎, 11-08-2012 11:46 PM
    • Replies: 5
    • Views: 1,125
    11-09-2012, 12:57 AM Go to last post
  20. Binomial Distributions?

    suppose you purchase a bundle of 10 bare-root broccoli plants the sales clerk tells you that on average you can expect 5% of the plants to die before...

    Started by tidries306‎, 11-08-2012 06:35 PM
    thank you!!
    • Replies: 1
    • Views: 1,772
    11-08-2012, 07:19 PM Go to last post
  21. MGF question

    Not to familiar with Moment Generating Functions will some one walk me though this example.... MGF of X1+X2+X3+X4 and MGF or X3+X4

    Started by april_gsu2007‎, 11-08-2012 02:38 PM
    • Replies: 1
    • Views: 1,188
    11-08-2012, 02:41 PM Go to last post
  22. Combining Variance of different groups

    Hello I am a new member here and I have got a query on combining variances of two or more sets of groups. Say there are m+n elements split into two...

    Started by zepp‎, 11-08-2012 11:55 AM
    • Replies: 0
    • Views: 2,253
    11-08-2012, 11:55 AM Go to last post
  23. calculating the absolute error between two transition tables, simple but confusing :)

    Dear all , I have a simple yet confusing problem, I am trying to figure out which is the correct approach to proceed. Here it goes I have a...

    Started by supp‎, 11-07-2012 09:26 AM
    error estimator
    • Replies: 2
    • Views: 1,296
    11-08-2012, 09:10 AM Go to last post
  24. 4 times the same experiment with 4 conditions in each experiment: 2-way ANOVA?

    I have run 4 times the same experiment and in each experiment I have the same 4 conditions. In each group, in each experiment, I have 3 to 5 mice. I...

    Started by mousme‎, 11-06-2012 08:51 AM
    • Replies: 2
    • Views: 1,318
    11-08-2012, 06:21 AM Go to last post
  25. Simple test needed

    Hi all I have some a polygon area that is an output from an environmental model and some discreet data points some of which fall withing the...

    Started by StuckWithStatsStan‎, 11-07-2012 08:28 PM
    • Replies: 2
    • Views: 1,173
    11-08-2012, 05:21 AM Go to last post
  26. which test to use

    Hey, I do have data on the nutritional status children as well as the education level of the father - it is a table with four educational levels...

    Started by heinoto‎, 11-07-2012 04:53 PM
    • Replies: 2
    • Views: 1,435
    11-08-2012, 05:06 AM Go to last post
  27. Exclamation Derivative of Geometric Progression [WITHOUT] Differentiation?

    Dear friends, I am trying to find the Var(X) of a Shifted Geometric Progression to solve a question that I have to present in class. I referred...

    Started by Tranceflux‎, 11-08-2012 03:05 AM
    • Replies: 3
    • Views: 1,862
    11-08-2012, 04:45 AM Go to last post
  28. Can someone help me with a statistics question regarding a T Score (capital 'T')

    I am studying to take the GRE-Psychology subject exam and there is a stats question in the Educational Testing Services practice exam book that I...

    Started by jesseserles‎, 11-07-2012 06:31 PM
    • Replies: 2
    • Views: 3,761
    11-07-2012, 08:43 PM Go to last post
  29. Why would an attribute in a data set not be included in a generated decision tree?

    Say I have a data set of customers with information such as bank account, age, telephone, credit history, emplyoment, etc... How could when I used...

    Started by truetaurus‎, 11-07-2012 04:00 PM
    decision trees, model, statistics
    • Replies: 0
    • Views: 1,182
    11-07-2012, 04:00 PM Go to last post
  30. Combining Sample Statistics for Higher Precision, possible? Under what conditions?

    Say I have dozens of samples and with them dozens of estimates of a population's mean along with associated confidence intervals -the samples could...

    Started by DaGuy‎, 11-07-2012 12:00 PM
    • Replies: 6
    • Views: 2,345
    11-07-2012, 03:37 PM Go to last post
  31. what is the similarity between Karl pearson cross product and Gauss discovery

    Gauss’s childhood insight into how to sum large sets of numbers in a linear series is analogous to that underlying the cross-products formulation for...

    Started by moe6142‎, 11-06-2012 06:56 PM
    • Replies: 3
    • Views: 2,257
    11-07-2012, 02:24 PM Go to last post
  32. Spear man Rank-order question

    In ranking the quality of the last six red wines tasted, you and your significant other (a.k.a. “spousal unit”) agree, except inexplicably on the...

    Started by moe6142‎, 11-07-2012 11:28 AM
    • Replies: 4
    • Views: 1,630
    11-07-2012, 02:21 PM Go to last post
  33. Did I deisgn this wrong? Using dummy variables for Y

    Hi all, Thanks for taking a look at this. Regression Statistics Multiple R 0.908734206 R Square 0.825797856 Adjusted R Square...

    Started by dbuck‎, 11-06-2012 02:45 PM
    regression model
    • Replies: 3
    • Views: 1,628
    11-07-2012, 12:04 PM Go to last post
  34. Home work help

    Hi! I am in need for advice on this, for me at least as new to the subject (have only taken 15 ECTS), tricky question: Anyone who could help...

    Started by Mr. G‎, 11-07-2012 11:02 AM
    • Replies: 1
    • Views: 858
    11-07-2012, 11:25 AM Go to last post
  35. need help finding p-value for presentation

    here is the question i will have to present in class In a process of manufacturing metal piece using two different cooling processes. In order to...

    Started by chasna090‎, 11-07-2012 10:44 AM
    • Replies: 1
    • Views: 897
    11-07-2012, 11:01 AM Go to last post
  36. No significance in ANOVA, significance in t-test. Am I doing this wrong?

    Hi folks. I've got a set of chemical measurements taken from three different groups -- a control soil, a low-contamination soil, and a high...

    Started by lab rat‎, 11-06-2012 04:58 PM
    • Replies: 3
    • Views: 1,459
    11-07-2012, 06:01 AM Go to last post
  37. Test median again hypothesized median value_ one sample Wilcoxon signed ranks test

    I have a question regarding testing a median against a hypothesized value. On a five-point Likert-style scale (1=regressed; 5 = met goal ),...

    Started by arata‎, 11-05-2012 02:21 PM
    hypothesized median, median, ordinal, wilcoxon signed ranks
    • Replies: 6
    • Views: 4,829
    11-07-2012, 05:32 AM Go to last post
  38. Moe, Hannah, and Mathguy chatting it up

    Mittens suffers from Romnesia an average of 5 times per week. However, Joe “I’m just sayin’” Biden claims that Mittens rarely suffers from fewer than...

    Started by moe6142‎, 11-05-2012 01:41 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,865
    11-07-2012, 01:17 AM Go to last post
  39. Question Probability John wins the game (X) given...

    I am so stumped. What is the probability John wins the game, given: Coming into the game, John should win 90% of the time, BUT an average...

    Started by statdude‎, 11-04-2012 05:44 PM
    • Replies: 4
    • Views: 1,643
    11-06-2012, 06:01 PM Go to last post
  40. Significance testing on share of spend

    Hi all, can someone point me in the right direction for how i would work out stat sig of share of spend? eg - 5 companies in market, ask ppl...

    Started by willh6373‎, 11-05-2012 08:04 PM
    confidence interval, significance, significance testing
    • Replies: 1
    • Views: 2,537
    11-06-2012, 05:35 PM Go to last post
  41. ACF plot in Non Stationary Time Sereis

    Hello Folks I know that in non-stationary time series, the Auto Correlation Function plot dies down extremely slowly while if the series is...

    Started by niamyara‎, 11-06-2012 05:21 PM
    acf plot, time series analysis
    • Replies: 0
    • Views: 3,921
    11-06-2012, 05:21 PM Go to last post
  42. Study Design Question

    I have a study design question for you. I'm designing a study that will implement a bully prevention program into schools. The study will consist of...

    Started by beezer1983‎, 11-06-2012 11:40 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,022
    11-06-2012, 03:29 PM Go to last post
  43. Statistical test for consistent performers!

    Hi All, I have the data of firm performance (say on a scale of 10) for 50 firms over 10 years. Which statistical test (with significance levels)...

    Started by krishnareloaded‎, 11-06-2012 04:32 AM
    • Replies: 3
    • Views: 1,839
    11-06-2012, 12:11 PM Go to last post
  44. Exclamation Confidence interval and proportions

    Can someone see if this is correct? To devise effective marketing strategies it is helpful to know the characteristics of your customers. A study...

    Started by somethingclever‎, 11-03-2012 09:30 PM
    • Replies: 3
    • Views: 1,268
    11-06-2012, 06:53 AM Go to last post
  45. Sst= ssw+ssb

    Hi everyone, I have this problem to solve. It's been a while since I tried to figured out how to do, but I am totally lost. Here it is. Prove...

    Started by Kentsection‎, 11-05-2012 11:31 PM
    computation, formula, proof, statistic
    • Replies: 0
    • Views: 4,087
    11-05-2012, 11:31 PM Go to last post
  46. Hypothesis tests applied to two means (two related samples) question about null.

    Hello, I am currently studying for an midterm, and am running into a roadblock with some of the concepts concerning hypothesis testing applied to...

    Started by kgkiwi11‎, 11-05-2012 09:05 PM
    hypothesis testing, independent samples, related samples, t-score, z-scores
    • Replies: 0
    • Views: 1,508
    11-05-2012, 09:05 PM Go to last post
  47. Building Fuel tables from scratch... Well with lots and lots of data!

    Hey guys, I was hoping someone can push me in the right direction. I'm not asking for you guys to do my work but rather just point me in the right...

    Started by tallman‎, 11-05-2012 07:51 PM
    • Replies: 0
    • Views: 598
    11-05-2012, 07:51 PM Go to last post
  48. Conditional Multivariate Probability

    So, I got this from my textbook and it makes sense: P_{Y|x}(y)= P(Y=y|X=x) = P_{X,Y}(x, y)/P_X(x) But I'm trying to apply it to this question...

    Started by oxycontiin‎, 11-04-2012 10:54 PM
    conditional, dice, multivariate, probability, problem
    • Replies: 8
    • Views: 3,400
    11-05-2012, 07:33 PM Go to last post
  49. Determining which statistical test to use and how to figure out sample size

    Hello, I'm looking to collect data for the organization that I work for (a senior retirement community management company) and draw correlations...

    Started by agalvan‎, 11-05-2012 05:32 PM
    • Replies: 0
    • Views: 3,127
    11-05-2012, 05:32 PM Go to last post
  50. adding ordinal datatype

    Hi! I am wondering what kind of datatype our new variable will get if we add variables that have ordinal datatype. For example: SWLS scale that...

    Started by loikan‎, 11-05-2012 12:54 PM
    • Replies: 1
    • Views: 1,241
    11-05-2012, 02:06 PM Go to last post
  51. Control for yearly effects

    Hi everybody, of course, I tried to find a thread with an answer about my topic. Unfortunately without success. I ran a multi regression...

    Started by fxen3k‎, 11-05-2012 10:11 AM
    control, dummy variable, yearly effects
    • Replies: 2
    • Views: 987
    11-05-2012, 11:27 AM Go to last post
  52. Correlation question ( how long you live and your height)

    In a recent study, among the very elderly (85+ years) of the sample, few (only 5.5%) of the men were over 1.9 metres tall. Yet, among their...

    Started by moe6142‎, 11-05-2012 01:35 AM
    • Replies: 0
    • Views: 1,079
    11-05-2012, 01:35 AM Go to last post
  53. Confused about paired vs. independent samples for t-tests

    I have viewed numerous websites and statistics resources and all state that paired samples are used for before and after comparisons in the same...

    Started by nc1‎, 11-04-2012 06:04 PM
    • Replies: 2
    • Views: 1,669
    11-05-2012, 12:03 AM Go to last post
  54. A particular type of random coefficient regression

    Hi all, I have the model of type Y_i=Beta_0_i+Beta_1_i*X1_i+...+Beta_k_i*X_k_i, for i=1:n There is no error term in this model, but for each...

    Started by shoomchool‎, 11-04-2012 11:40 PM
    covariance matrix, heteroscedasticity, ols, random coefficient, regression
    • Replies: 0
    • Views: 1,037
    11-04-2012, 11:40 PM Go to last post
  55. In Need of Help! Please help me! check the attachments

    http://cchristinee.tumblr.com/image/35038161887 <-- problem my answers for S^2 = .36 Sm = .1 t = -2.5

    Started by help‎, 11-04-2012 11:31 PM
    • Replies: 0
    • Views: 1,287
    11-04-2012, 11:31 PM Go to last post
  56. Need some help with basic Statistics

    I've got a small table, as follows: GROUP n xbar (s/rootn) Alcohol: 25 0.25 0.05 Placebo: 25 0.12 0.03 It asks me for...

    Started by tylerford‎, 11-04-2012 10:24 PM
    • Replies: 0
    • Views: 2,415
    11-04-2012, 10:24 PM Go to last post
  57. Question Confused with two-way ANOVA hypotheses

    Hello all, I am working on my assignment of two-way ANOVA and feel totally lost. In my understanding, hypotheses for two-way ANOVA are three. ...

    Started by zerogreen‎, 11-04-2012 06:31 PM
    hypotheses, two-way anova
    • Replies: 0
    • Views: 1,130
    11-04-2012, 06:31 PM Go to last post
  58. Missing values - too many?

    Hi, Currently I'm doing research on analyst forecast accuracy and want to add another variable to my research: number of industries followed by an...

    Started by FinanceStud‎, 11-01-2012 03:50 PM
    • Replies: 6
    • Views: 2,792
    11-04-2012, 07:21 AM Go to last post
  59. Standard deviation problems

    1. Suppose the lifetime of a certain types of televisions follow an exponential distribution with a median of 7 years. Assume the warranty period is...

    Started by well‎, 11-03-2012 02:16 PM
    • Replies: 1
    • Views: 1,402
    11-03-2012, 02:43 PM Go to last post
  60. how to prove SSE has n-2 degrees of freedom???

    make use of matrix or?

    Started by dennis_szsy‎, 11-03-2012 07:35 AM
    • Replies: 4
    • Views: 3,881
    11-03-2012, 12:01 PM Go to last post

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