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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: 196,679
    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: 66,703
    09-30-2005, 09:44 AM Go to last post
  1. Needing help with understanding sampling error

    hello forum, i am having some trouble understanding what sampling error is. could you explain to me what this explains? and if i had a boss and he...

    Started by AS1020‎, 12-11-2015 11:24 PM
    • Replies: 2
    • Views: 682
    12-12-2015, 06:35 PM Go to last post
  2. Exclamation Sample Size Selection

    Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

    Started by Bird1990‎, 12-12-2015 03:10 PM
    • Replies: 0
    • Views: 1,163
    12-12-2015, 03:10 PM Go to last post
  3. Red face Which analysis should I choose

    Here are 2 situations: A. Experimental program vs. traditional program. Which one is the best? - 130 kids, 60 in the experimental program and 60...

    Started by StatsQuest‎, 12-12-2015 02:58 PM
    • Replies: 0
    • Views: 920
    12-12-2015, 02:58 PM Go to last post
  4. Scoring System Help Please

    Hi, Im currently completing a research proposal and need to create a scoring system. I have two sets of data which I'm comparing statistically....

    Started by aarongandecha‎, 12-12-2015 12:26 PM
    • Replies: 0
    • Views: 889
    12-12-2015, 12:26 PM Go to last post
  5. Question Comparing multiple groups - What test should I use?

    Good evening, everybody. I'm currently running tests on a sample and I'm not sure which test should I use to compare different groups. I'll...

    Started by salesmd‎, 12-11-2015 11:24 AM
    • Replies: 1
    • Views: 1,172
    12-11-2015, 12:49 PM Go to last post
  6. SPSS Output Help

    Hi Everyone, I need help understanding SPSS output for my marketing research final exam. I have attached a picture with what I want to understand....

    Started by sasanasamani‎, 12-07-2015 04:10 PM
    • Replies: 2
    • Views: 1,980
    12-11-2015, 12:54 AM Go to last post
  7. Question Data with > values

    Okay, so with the data set I currently have I would usually run a one way ANOVA with probably a Dunnets post hoc test to compare and find the...

    Started by bluesparks‎, 12-10-2015 02:39 PM
    anova, censored, data, more than
    • Replies: 4
    • Views: 1,679
    12-10-2015, 10:24 PM Go to last post
  8. Sampling Distribution, Probability of Selecting One Random Individual

    In a large population of college-educated adults, the mean IQ is 118, and the standard deviation of their IQs is 20. Suppose 200 adults from this...

    Started by JankyGeo‎, 12-09-2015 08:12 PM
    • Replies: 2
    • Views: 2,022
    12-10-2015, 12:16 PM Go to last post
  9. Comparing the rate of two clinical events

    Hi Guys, I'm working on a clinical research project and trying to figure out the best test for comparing the rates of clinical events. Basically,...

    Started by doctorspeed‎, 12-09-2015 02:09 PM
    • Replies: 5
    • Views: 1,794
    12-10-2015, 08:43 AM Go to last post
  10. Normal distribution question help

    Assume a normal distribution with a known standard deviation, with 34% of the observations contained in the interval μa. If the standard deviation...

    Started by lawtheman‎, 12-09-2015 11:20 PM
    • Replies: 1
    • Views: 1,148
    12-09-2015, 11:52 PM Go to last post
  11. PDF of LogNormal distribution from random numbers

    Dear all, I have trouble understanding why "textbook" formula for probability density function (PDF) of lognormal distribution is different from...

    Started by katpyxa‎, 12-07-2015 12:28 PM
    distribution, lognormal
    • Replies: 3
    • Views: 2,480
    12-08-2015, 02:06 PM Go to last post
  12. ROC using only binary outcome data

    Hi everyone, I have recently started learning application of statistical tests for data analysis. I had a question: Is it possible to plot a ROC...

    Started by reskhuh‎, 12-08-2015 02:59 AM
    • Replies: 1
    • Views: 1,297
    12-08-2015, 10:31 AM Go to last post
  13. goodness of fit test( chi square test)

    i want to find out test statistics and p value of different probability distribution by using chisquare test. distributions are 1. normal 2....

    Started by alam06es‎, 12-08-2015 04:53 AM
    • Replies: 0
    • Views: 1,214
    12-08-2015, 04:53 AM Go to last post
  14. Question about which test to use

    Hi there everyone, I apologize if this is in the wrong section. It is not technically coursework but is elementary (I think) so I put it here! ...

    Started by amichel‎, 12-08-2015 12:42 AM
    • Replies: 1
    • Views: 1,363
    12-08-2015, 02:59 AM Go to last post
  15. The difference between R squared and adjusted R squared

    if your R squared - 0.999 and adjusted R squared = 0.998 what can you infer from this difference (lack of difference) in a multiple regression model...

    Started by stats2424‎, 12-06-2015 11:08 AM
    #correlation, #multicollinearity, #regression, #rsquared
    • Replies: 4
    • Views: 4,034
    12-07-2015, 12:25 PM Go to last post
  16. After a significant MANOVA, is the next proper step to run univariate ANOVAs?

    So I've heard both sides of this and am curious what you guys think. Some sources that I have read have said that after a significant MANOVA, you...

    Started by srpang89‎, 12-06-2015 07:51 PM
    • Replies: 0
    • Views: 909
    12-06-2015, 07:51 PM Go to last post
  17. Empirical (Sample) Variogram

    Hi, I was looking online and I found that some sites say that the empirical variogram is the same as the semivariogram (variogram) but some sites say...

    Started by N2S‎, 12-06-2015 05:26 PM
    • Replies: 0
    • Views: 1,093
    12-06-2015, 05:26 PM Go to last post
  18. Hypothesis:

    If you wanted your null hypothesis to be that y and x are linearly related, and your alternative to be that they are quadratic. What could you use as...

    Started by stats2424‎, 12-06-2015 10:59 AM
    hypothesis, linear, quadratic, regression, testing
    • Replies: 0
    • Views: 1,164
    12-06-2015, 10:59 AM Go to last post
  19. Regional analysis of disease risk factors

    I'm working with a large data set looking at climate variables e.g maximum, minimum temperature etc to see whether these could be risk factors for...

    Started by Jojo2015‎, 12-05-2015 09:08 PM
    applied statistics, biostatistics, statistical analysis
    • Replies: 4
    • Views: 1,147
    12-06-2015, 08:28 AM Go to last post
  20. Going to Fail Statistics... Please be kind and help me

    If there is any information regarding statistics at the most basic level (113), formulas, central limit theorem, probability, means of means,...

    Started by vRomano‎, 12-06-2015 12:30 AM
    • Replies: 1
    • Views: 1,199
    12-06-2015, 02:20 AM Go to last post
  21. Spss arima

    I am using SPSS to forecast a time series model. All I have are values and dates. It automatically gives me the best fit model using either ARIMA or...

    Started by kickassness‎, 12-04-2015 05:35 PM
    • Replies: 0
    • Views: 1,009
    12-04-2015, 05:35 PM Go to last post
  22. Empirical Research from a Sample

    Hi, Im looking for some help carrying out empirical research that I need to do for an assignment. The data is based on a sub sample of a survey given...

    Started by Anonan‎, 12-04-2015 09:38 AM
    • Replies: 0
    • Views: 1,303
    12-04-2015, 09:38 AM Go to last post
  23. grad school final

    I need help determining correct tests to run given a data set and questions. If anyone knowledgeable could email me? justmeandk@gmail.com

    Started by Jay Kenyon‎, 12-04-2015 02:07 AM
    • Replies: 1
    • Views: 1,139
    12-04-2015, 02:38 AM Go to last post
  24. need help

    The mean incubation time of fertilized eggs is 23 days. Suppose the incubation times are approximately normally distributed with a standard...

    Started by Lattemoon‎, 12-03-2015 10:37 PM
    • Replies: 1
    • Views: 2,140
    12-03-2015, 11:04 PM Go to last post
  25. Which tests should I use?!

    Hi, I need to complete a few tests for my third year psychology dissertation, I got results in from a questionnaire but I dont know which tests will...

    Started by blazewater‎, 12-03-2015 05:01 AM
    • Replies: 1
    • Views: 1,189
    12-03-2015, 04:56 PM Go to last post
  26. Zero Inflated Model(s)

    Hello all, I'm working on a paper on the spatiotemporal distributions and abundances of rock pool fish. Over a couple of years, every month, the...

    Started by cjjb87‎, 11-27-2015 04:52 AM
    count, zero inflated, zero number, zip
    • Replies: 2
    • Views: 1,374
    12-03-2015, 04:54 AM Go to last post
  27. Is it possible to calculate margin of error when sample does not have a normal distri

    thank you for the answers guys

    Started by feignfeign‎, 12-01-2015 09:24 PM
    • Replies: 4
    • Views: 1,432
    12-02-2015, 04:37 PM Go to last post
  28. One-factor and two-factor ANOVA questions!

    I've got two quick questions about the interaction term in a two-factor ANOVA. First, what does the interaction term exactly mean? For example, say...

    Started by srpang89‎, 12-01-2015 10:50 PM
    • Replies: 2
    • Views: 1,574
    12-02-2015, 02:58 AM Go to last post
  29. representative sample? comparison of variance?

    Hello. i did an online survey. i was able to classify the responses by the districts they came from. I also obtained the total population for each...

    Started by psychdr‎, 11-29-2015 06:59 PM
    • Replies: 2
    • Views: 1,344
    12-01-2015, 09:18 PM Go to last post
  30. ANOVA - Uneven observations p/condition but same sample size

    Good Day everyone, Hope all is going well. This is my first post on this forum so I hope I am doing it right. I saw another post on a forum and...

    Started by Jaco Liebenberg‎, 12-01-2015 01:30 PM
    • Replies: 0
    • Views: 1,078
    12-01-2015, 01:30 PM Go to last post
  31. Interpretation of Coefficients in Granger Causality Analysis

    Hi. I am currently reading a study using Granger causality analysis which unfortunately is far beyond my statistics introductory course. Even with...

    Started by Rulerio‎, 11-28-2015 09:47 AM
    • Replies: 1
    • Views: 1,143
    12-01-2015, 12:22 PM Go to last post
  32. Confidence Interval Question

    How would I solve this problem? A study of the fall lobster catch showed that for 35 lobsters lobsters selected at random the mean weight was 2.9...

    Started by Ericracer‎, 12-01-2015 01:42 AM
    • Replies: 1
    • Views: 1,775
    12-01-2015, 05:23 AM Go to last post
  33. Hypothesis Testing Problem

    Hello, I need help solving this problem. I have tried using the z - test for a mean formula and get 6.15. I believe I am doing this wrong...

    Started by Ericracer‎, 11-29-2015 09:00 PM
    • Replies: 4
    • Views: 1,888
    12-01-2015, 01:39 AM Go to last post
  34. Post Steel Dwass test original paper

    Hi, I was wondering if anyone can find the original paper for Steel-Dwass test from 1960 as Google couldn't help me on this? I just need to...

    Started by Sushinometrics‎, 11-30-2015 08:34 PM
    • Replies: 1
    • Views: 2,176
    11-30-2015, 08:36 PM Go to last post
  35. Unequal Sample Size and Wilcoxon Rank Sum Test

    thank you for the answers guys

    Started by feignfeign‎, 11-25-2015 08:16 PM
    • Replies: 4
    • Views: 3,741
    11-30-2015, 04:26 PM Go to last post
  36. Main effect vs. Interaction effect in ANOVA

    I think that a researcher is in general more likely to find a significant main effect than a significant interaction effect in ANOVA. Do you agree...

    Started by SMcfarland‎, 11-30-2015 10:17 AM
    anova, interaction effect, main effect
    • Replies: 11
    • Views: 2,531
    11-30-2015, 04:04 PM Go to last post
  37. Matched-Guise Test (MGT) Statistical Analysis

    Hi all, I'm working on a study focussing on speaker attitudes to different dialects. I'm obtaining data via MGT: 8 recordings (4 'standard...

    Started by larudge‎, 11-30-2015 07:10 AM
    • Replies: 0
    • Views: 1,368
    11-30-2015, 07:10 AM Go to last post
  38. WTI price vs. Drilling Cost Index

    Hi Folks, I have 2 datasets, each recorded on a monthly basis. The first dataset is the average monthly oil price. The second is a price index for...

    Started by babacole‎, 11-29-2015 09:31 PM
    • Replies: 0
    • Views: 1,115
    11-29-2015, 09:31 PM Go to last post
  39. [SPSS - wilcoxon/paired t test] - not normally distributed data

    Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

    Started by LoudWhisper‎, 11-27-2015 07:36 PM
    normal distributed, paired t-test, parametric, spps, wilcoxon
    • Replies: 4
    • Views: 3,150
    11-29-2015, 09:13 PM Go to last post
  40. Random values from a normal distribution when n=1 or small?

    Hello. Maybe my question is a bit weird, but I have a problem. The times people have when they leave a building during a evacuation follow a normal...

    Started by Pabs‎, 11-26-2015 06:28 PM
    • Replies: 3
    • Views: 1,495
    11-29-2015, 08:20 PM Go to last post
  41. How to convert a scaled score to a T-score?

    What is the formula for converting a scaled score (mean 10, SD 3) to a T-score (mean 50 SD 10)? Maths, statistics, and life aren't my strong...

    Started by Toivo‎, 11-29-2015 09:50 AM
    • Replies: 3
    • Views: 1,285
    11-29-2015, 03:27 PM Go to last post
  42. Reliability

    hi i have a question here suppose a test has 50 dichotomous items. the sum of the variances of the items is 7 and the variance of the total score...

    Started by Nivv‎, 11-28-2015 11:08 AM
    • Replies: 1
    • Views: 1,731
    11-28-2015, 04:09 PM Go to last post
  43. Interaction without principal effects

    Hi, my question is: is it possible that in one model all effects are interactions between variables and no principal effects are present? I...

    Started by FR4K‎, 11-27-2015 06:12 AM
    • Replies: 6
    • Views: 1,799
    11-28-2015, 10:40 AM Go to last post
  44. Removing sig main effects to see a sig interaction effect (logreg)

    Hello, I am doing research right now and have been looking for some interaction effects, I have found a non-significant interaction effect...

    Started by derekcruise‎, 11-27-2015 04:32 PM
    • Replies: 3
    • Views: 1,512
    11-28-2015, 02:48 AM Go to last post
  45. Standard Deviation

    My instructor has asked me to analyze three different surveys to determine if the correct sample size was chosen. However, I do not have access to...

    Started by axtat‎, 11-27-2015 09:21 AM
    • Replies: 1
    • Views: 1,440
    11-27-2015, 10:37 AM Go to last post
  46. unbiasedness

    I have difficulties with solving this problem, please help! Let X1;:::;Xn be i.i.d. ~ Exp(lambda) with unknown parameter lambda > 0. Check if...

    Started by xadesbg‎, 11-27-2015 10:10 AM
    • Replies: 0
    • Views: 1,324
    11-27-2015, 10:10 AM Go to last post
  47. indicator or simple reference category (logistic regression)

    Could someone please explain to me when exactly I choose either/or indicator or simple reference categories for variables in logistic regression? ...

    Started by derekcruise‎, 11-27-2015 04:28 AM
    • Replies: 0
    • Views: 1,178
    11-27-2015, 04:28 AM Go to last post
  48. What test to use to compare 3 variables

    I have a homework question that has a table of 3 variables and asks if they differ: "Your sales (in sodas per hour) for 5 sections in each of the...

    Started by Carried91‎, 11-24-2015 03:55 PM
    • Replies: 1
    • Views: 898
    11-27-2015, 03:36 AM Go to last post
  49. Use interaction effect or main effect

    Hello, Looking for a little advice please. I have run several logistic regression models in spss, I have found a statistically significant...

    Started by derekcruise‎, 11-26-2015 10:27 PM
    • Replies: 0
    • Views: 961
    11-26-2015, 10:27 PM Go to last post
  50. Monte Carlo Integration with Computationally expensive Integrant

    Consider \mathcal{R}_x = \int_{x'} C(x|x')P(x')dx', where \mathcal{R}_x = risk of following input x C(x|x') = cost of following input x when in...

    Started by pemfir‎, 11-26-2015 12:40 PM
    intergation, monte-carlo
    • Replies: 0
    • Views: 853
    11-26-2015, 12:40 PM Go to last post
  51. chi-square test with very uneven binary variable and an ordered variable

    Hello everyone, this is probably a quite simple question, yet I would like to ask it here. I want to run a chi-square test between one binary coded...

    Started by andik‎, 11-24-2015 11:28 PM
    • Replies: 3
    • Views: 1,163
    11-26-2015, 03:35 AM Go to last post
  52. Question How to do the Time Series Forecasting, the right way?

    Hello all, I don't know much about the topic, but I want to learn. I have been given a time series in the form of (date, number). and I need to...

    Started by cybergeek‎, 11-24-2015 01:48 PM
    time series forecast
    • Replies: 1
    • Views: 1,258
    11-25-2015, 02:06 PM Go to last post
  53. Could you help to find useful method for my purpose?

    Hi everbody, I need to find a method which can answer my question: I have several parameters (at least 3) which are formed of raw data...

    Started by merveo‎, 11-25-2015 04:24 AM
    • Replies: 2
    • Views: 995
    11-25-2015, 11:42 AM Go to last post
  54. Compare odds in two fisher tests

    Dear all, I performed 3 fisher tests from data implicating in each test the same two sets (A & B) with two different sets in each case (A&B vs...

    Started by statQuery‎, 11-23-2015 11:02 AM
    chi, fisher, odds ratios
    • Replies: 6
    • Views: 1,603
    11-25-2015, 06:08 AM Go to last post
  55. Red face Create lognormal from a normal distribution

    Hello All, For a research I am doing I have a source that says that the range is 120 seconds to 1260 seconds, and that the mean is 356. Also, that...

    Started by Pabs‎, 11-23-2015 06:55 AM
    • Replies: 10
    • Views: 2,078
    11-24-2015, 05:34 PM Go to last post
  56. Test for paired, non parametric ethogram data

    Hello, I am having trouble discerning which statistical test would be appropriate to use. I am looking at number of "cleaning advertisements"...

    Started by Jake11‎, 11-24-2015 04:06 PM
    • Replies: 0
    • Views: 1,414
    11-24-2015, 04:06 PM Go to last post
  57. Which method to use when sample sizes are very different?

    Dear All, I'm trying to analyze the significance of difference between two groups. However the two groups have different sample size (one has 213...

    Started by aropro‎, 11-24-2015 08:47 AM
    • Replies: 5
    • Views: 1,569
    11-24-2015, 04:01 PM Go to last post
  58. Sample size calculation for 2 proportions

    Hello, I am required to calculated the required sample size in a clinical study where we know the variable is a proportion. I have been trying to...

    Started by rottemg‎, 11-23-2015 04:19 AM
    • Replies: 5
    • Views: 1,762
    11-24-2015, 07:16 AM Go to last post
  59. constructing a table from a binomial experiment

    Hello all new here and this is my first post. I am looking to check my work before I turn it in and hope that you will help me with that so here is...

    Started by norcal‎, 11-23-2015 07:07 PM
    • Replies: 2
    • Views: 1,455
    11-23-2015, 10:18 PM Go to last post
  60. Can you help me decide if there is statistical significance here?

    Hi, I've attached a word file - it contains exam results. There were two sessions - one AM and one PM. . I am trying to work out if there is a...

    Started by lost81‎, 11-23-2015 11:53 AM
    exam, moderation, significance, significance testing
    • Replies: 2
    • Views: 1,227
    11-23-2015, 12:28 PM Go to last post

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