1. 10-14-2010
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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: 110,045
    07-16-2014, 12:01 PM 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 10:44 AM
    • Replies: 0
    • Views: 32,079
    09-30-2005, 10:44 AM Go to last post
  1. 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, Today 01:42 AM
    • Replies: 1
    • Views: 48
    Today, 05:23 AM Go to last post
  2. 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: 141
    Today, 01:39 AM Go to last post
  3. 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, Yesterday 08:34 PM
    • Replies: 1
    • Views: 71
    Yesterday, 08:36 PM Go to last post
  4. Unequal Sample Size and Wilcoxon Rank Sum Test

    It is my understanding that it is okay to perform the Wilcoxon Rank Sum test with slightly unequal sample sizes. I just don't understand how the...

    Started by feignfeign‎, 11-25-2015 08:16 PM
    • Replies: 4
    • Views: 195
    Yesterday, 04:26 PM Go to last post
  5. 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, Yesterday 10:17 AM
    anova, interaction effect, main effect
    • Replies: 11
    • Views: 139
    Yesterday, 04:04 PM Go to last post
  6. 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, Yesterday 07:10 AM
    • Replies: 0
    • Views: 62
    Yesterday, 07:10 AM Go to last post
  7. 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: 75
    11-29-2015, 09:31 PM Go to last post
  8. [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: 175
    11-29-2015, 09:13 PM Go to last post
  9. 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: 190
    11-29-2015, 08:20 PM Go to last post
  10. 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: 0
    • Views: 78
    11-29-2015, 06:59 PM Go to last post
  11. 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: 109
    11-29-2015, 03:27 PM Go to last post
  12. 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: 154
    11-28-2015, 04:09 PM Go to last post
  13. 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: 179
    11-28-2015, 10:40 AM Go to last post
  14. 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: 0
    • Views: 101
    11-28-2015, 09:47 AM Go to last post
  15. 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: 106
    11-28-2015, 02:48 AM Go to last post
  16. 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: 1
    • Views: 93
    11-27-2015, 01:10 PM Go to last post
  17. 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: 125
    11-27-2015, 10:37 AM Go to last post
  18. 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: 87
    11-27-2015, 10:10 AM Go to last post
  19. 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: 72
    11-27-2015, 04:28 AM Go to last post
  20. 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: 117
    11-27-2015, 03:36 AM Go to last post
  21. 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: 77
    11-26-2015, 10:27 PM Go to last post
  22. 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: 112
    11-26-2015, 12:40 PM Go to last post
  23. 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: 167
    11-26-2015, 03:35 AM Go to last post
  24. 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: 124
    11-25-2015, 02:06 PM Go to last post
  25. 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: 137
    11-25-2015, 11:42 AM Go to last post
  26. 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: 214
    11-25-2015, 06:08 AM Go to last post
  27. 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: 321
    11-24-2015, 05:34 PM Go to last post
  28. 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: 115
    11-24-2015, 04:06 PM Go to last post
  29. 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: 163
    11-24-2015, 04:01 PM Go to last post
  30. 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: 180
    11-24-2015, 07:16 AM Go to last post
  31. 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: 166
    11-23-2015, 10:18 PM Go to last post
  32. 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: 181
    11-23-2015, 12:28 PM Go to last post
  33. Minimum percentage in a distribution

    I have more than 40 values which are increasing linear continuously and in that distribution there are weightages allotted to each one. The maximum...

    Started by shanck‎, 11-23-2015 08:50 AM
    • Replies: 0
    • Views: 103
    11-23-2015, 08:50 AM Go to last post
  34. Post Beginner's stats: analysis of crime data

    I have two data sets of crimes in two different cities for a period of one year, by crime type, and by city area. If I perform two-sample t-test...

    Started by pavelk‎, 11-22-2015 11:03 AM
    • Replies: 2
    • Views: 161
    11-23-2015, 06:06 AM Go to last post
  35. Help: The Process Capability ....

    A process is in statistical control with x barbar = 751.5 and s = 2.5 Specifications are at LSL = 745 and USL = 755. (a) Estimate the process...

    Started by brooke‎, 11-22-2015 12:26 PM
    • Replies: 1
    • Views: 155
    11-22-2015, 01:20 PM Go to last post
  36. Why is log transformation valid?

    I dont quite understand why it is valid to do a log transformation to compare means. By using log transformation, you are artificially changing your...

    Started by paperrockbazooka‎, 11-19-2015 06:50 PM
    • Replies: 12
    • Views: 421
    11-21-2015, 03:06 PM Go to last post
  37. Product distribution of independent cosines

    I've got two independent, uniformly distributed, random variables α and . I'm trying to figure out the probability distribution of x = cos α cos ....

    Started by MackTuesday‎, 11-20-2015 02:28 PM
    • Replies: 2
    • Views: 187
    11-21-2015, 11:42 AM Go to last post
  38. Choosing the right probability distribution

    Hi, I have different response variables of migrating birds, which I want to investigate via regression: 1.) some kind of speed (distance per...

    Started by rotkehlpieper‎, 11-20-2015 12:08 PM
    probability distributions
    • Replies: 0
    • Views: 119
    11-20-2015, 12:08 PM Go to last post
  39. Likelihood with skewed distributions

    Hi I work in a hospital and we are trying to compare our activity with the national figures. The national activity distribution for the...

    Started by scotchpie‎, 11-20-2015 08:07 AM
    • Replies: 2
    • Views: 159
    11-20-2015, 08:21 AM Go to last post
  40. Exclamation reading Bland-Altman plot

    Hello, this is the plotting of about 200 double measurements (measured 200 samples with 2 different methods). Could I consider the 2 methods...

    Started by alfalfa‎, 11-19-2015 09:32 PM
    • Replies: 1
    • Views: 114
    11-20-2015, 08:06 AM Go to last post
  41. Hypothesis Testing - t test or ANOVA?

    Hi guys, I am doing a piece of work with an existing dataset and was looking for some advice. I have a group of subjects and controls and some...

    Started by arka‎, 11-19-2015 04:38 PM
    • Replies: 3
    • Views: 161
    11-20-2015, 07:36 AM Go to last post
  42. estimating expected value of a difficult cost function.

    suppose i want to compute the following expectation: E = \int C(x)f(x)dx where x follows a known pdf f(x) from which we can easily draw samples,...

    Started by pemfir‎, 11-20-2015 02:52 AM
    estimation, expectation
    • Replies: 1
    • Views: 137
    11-20-2015, 03:04 AM Go to last post
  43. Question Comparing two measuring methods ?

    Hi, I'd like to compare two devices to measure viscosity (like using two different kinds of weighing scales) on 6 different materials. Each...

    Started by alfalfa‎, 11-19-2015 04:09 AM
    • Replies: 3
    • Views: 186
    11-20-2015, 02:49 AM Go to last post
  44. Standard Deviation

    You select a random sample of n = 14 families in your neighborhood and find the following family sizes (number of people in the family). 15, 16,...

    Started by TierDenise‎, 11-19-2015 09:39 PM
    sample, standard deviation, statistics
    • Replies: 2
    • Views: 168
    11-19-2015, 10:20 PM Go to last post
  45. Lightbulb CLT and Proportions

    I would like to ask those of you who know their CLTs and Proportions a few questions. I am completing my HW right now and wanted do ask you guys a...

    Started by mathematicallyUNinclined‎, 11-19-2015 03:26 PM
    clt, feedback, proportions, stats
    • Replies: 0
    • Views: 101
    11-19-2015, 03:26 PM Go to last post
  46. Very New to Statistical Analysis Help!

    Hi Everyone, I am a grad student in the field of behavioral research in music education and I am working on a project to analyze the results of...

    Started by bwbryant76‎, 11-19-2015 02:46 PM
    • Replies: 1
    • Views: 128
    11-19-2015, 03:14 PM Go to last post
  47. interpretation of regression coefficients in categorical*continuous interaction

    Hello, I have been struggling with the interpretation of the coefficients in my multiple regression model and I hope you can help me with that! ...

    Started by Yana‎, 11-19-2015 05:12 AM
    categorical predictor, continuous moderator, interaction effect, regression coefficient, spotlight analysis
    • Replies: 0
    • Views: 131
    11-19-2015, 05:12 AM Go to last post
  48. Repeated measurements ANOVA with unequal sample sizes

    Hi all, I have conducted an experiment where the subject is first presented with a set of 7 stimuli. Thereafter, the subject is presented with a set...

    Started by mhh‎, 11-19-2015 04:15 AM
    ranova, unequal sample sizes
    • Replies: 0
    • Views: 108
    11-19-2015, 04:15 AM Go to last post
  49. Help me with Empirical Methods

    Dear Gurus of statistics :wave: I am student in Germany and I have an exam after 2 days from Empirical methods :shakehead ... is it possible that...

    Started by Gayane‎, 11-17-2015 06:14 PM
    #empirical #r
    • Replies: 9
    • Views: 324
    11-19-2015, 03:08 AM Go to last post
  50. Determine Number of Users in Control and Treatment Groups

    I need to be able to determine how many users should be in a control group and how many users should be in the treatment group. I have read that it...

    Started by baltimoreMan‎, 11-18-2015 06:40 PM
    • Replies: 3
    • Views: 153
    11-18-2015, 09:42 PM Go to last post
  51. Correlation and Significance (SPSS)

    I did a correlation test and can't figure out how to interpret the data. I'm used to getting high Pearson correlations with low significance values,...

    Started by 41310602613‎, 11-18-2015 06:21 PM
    • Replies: 1
    • Views: 162
    11-18-2015, 08:12 PM Go to last post
  52. hypothesis testing, stuck at finding standard deviation

    here's the actual question: The calculated nitrogen content of pure benzanilide is 7.10%. Five repeat analyses of "representative" samples ...

    Started by risya896‎, 11-18-2015 05:52 AM
    homework help
    • Replies: 2
    • Views: 167
    11-18-2015, 05:42 PM Go to last post
  53. [SPSS - Kaplan-Meier] show curves for all patients AND subgroups

    In SPSS, is it possible to add the curve for all patients to a Kaplan-Meier plot which displays two subgroups? Another question: is there a...

    Started by cp44‎, 11-18-2015 02:42 PM
    • Replies: 0
    • Views: 99
    11-18-2015, 02:42 PM Go to last post
  54. Test Tomorrow Morning (3 questions unsolved)

    Been looking everywhere for the answer to these three questions and have come up blank. My honors stat test is tomorrow. I'm praying someone here...

    Started by Sampson‎, 11-17-2015 09:12 PM
    • Replies: 0
    • Views: 160
    11-17-2015, 09:12 PM Go to last post
  55. Cronhach Alpha for internal consistency

    Hi all, I have a question regarding calculate the Cronhach alpha for total score. For some psychometric measurements, I have a 50 items...

    Started by dolleye‎, 11-17-2015 08:55 AM
    • Replies: 7
    • Views: 181
    11-17-2015, 03:00 PM Go to last post
  56. Chi Square Probability (Critical Value)

    For an applied linguistics course I do need your help. Unfortunately , for Df= 1 the values beyond p < 0.001 are not available in chi-square...

    Started by argusrockbar‎, 11-17-2015 05:19 AM
    • Replies: 3
    • Views: 139
    11-17-2015, 12:03 PM Go to last post
  57. I am too new for words

    Ok, I am quite new to statistical analysis and will be training myself. I am working in Quality Assurance at a nuclear site. Here is the premise:...

    Started by Nukedaddy‎, 11-16-2015 02:13 PM
    model, static
    • Replies: 1
    • Views: 144
    11-17-2015, 07:58 AM Go to last post
  58. Question Which statistical test to use? Compare 5 categories with data (ratio scale)

    Dear all, I desperately in need! I have two samples (reports of 30 good and 30 bad companies). For each sample I classified statements in five...

    Started by MaxLenk‎, 11-16-2015 06:08 AM
    • Replies: 4
    • Views: 230
    11-17-2015, 03:15 AM Go to last post
  59. Logistic regression interpretation for an idiot

    Hi. I'm not a statistician.... more of an statistidiot. I have been trying for some time to understand logistic regression interpretation but am...

    Started by Toivo‎, 11-15-2015 05:06 PM
    • Replies: 8
    • Views: 261
    11-16-2015, 02:44 PM Go to last post
  60. Lightbulb Urn Problem

    There are balls in an urn which are numbered from 1 to θ , we are interested in the number of balls in the urn and conduct a simple statistical...

    Started by Mr.Green‎, 11-15-2015 11:30 AM
    • Replies: 1
    • Views: 165
    11-15-2015, 10:25 PM Go to last post

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