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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: 196,759
    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: 66,758
    09-30-2005, 09:44 AM Go to last post
  1. What would you classify an "operational decision" for a DC?

    You run a distribution center that distributes different brands of cell phones to retailers in the area. You need to tackle inventory decisions that...

    Started by cassidy328‎, 03-17-2016 01:39 PM
    • Replies: 2
    • Views: 1,643
    03-17-2016, 02:26 PM Go to last post
  2. Unique Solution.

    Is the following statement true that : "To get unique solution of each parameter in a model, number of equations must be greater than or equal to...

    Started by Cynderella‎, 03-17-2016 12:36 AM
    factorial analysis, mle, system of equations
    • Replies: 1
    • Views: 1,293
    03-17-2016, 02:13 AM Go to last post
  3. t-test:is it worth using if sample size is very small and results are very different?

    Dear all, As part of a lab practical, I am comparing nitrite concentration in two different samples (sample 1 and 2). I only have three data for...

    Started by aponi11‎, 03-16-2016 07:28 AM
    • Replies: 3
    • Views: 1,970
    03-16-2016, 11:44 AM Go to last post
  4. Which t test?

    I have 5 machines that each produced 100 cars. I have data showing how long each toy car lasted. We think one machine is malfunctioning. I need to...

    Started by Quixotic42‎, 03-15-2016 08:22 PM
    • Replies: 1
    • Views: 1,729
    03-16-2016, 06:53 AM Go to last post
  5. recoding a sequence in SPSS

    I have a sequence of numbers: 10001 01 10002 01 10003 01 10004 01 10001 02 10002 02 10003 02 10004 02 10001 03 10002 03

    Started by blue123rd‎, 03-16-2016 05:12 AM
    • Replies: 0
    • Views: 1,401
    03-16-2016, 05:12 AM Go to last post
  6. Question T/Bond rate worst case scenario at 95% confidence Interval

    I have past one year t/bond rates separately for tenors 1 year,2 year and 3 year. Now I want to calculate worst case scenario ( worst rate...

    Started by John267‎, 03-16-2016 03:40 AM
    • Replies: 0
    • Views: 1,210
    03-16-2016, 03:40 AM Go to last post
  7. Question Finding correlation between orders (DV) and price (IV), with many other IVs at play

    I have a large data set of several million customer orders for a product, over the past two years. Orders have grown steadily over that period (with...

    Started by kebertxela‎, 03-15-2016 10:59 PM
    • Replies: 0
    • Views: 1,336
    03-15-2016, 10:59 PM Go to last post
  8. How do I normalize the variance of error terms in multinomal logit/probit models?

    Hi, I use a multinomial logit model to analyze a choice experiment with three options. I normalize the coefficient of one of the options, say option...

    Started by Thomas.V‎, 03-15-2016 12:11 PM
    choice experiment, equality coefficients, error variance, multinomial logit, normalization
    • Replies: 0
    • Views: 884
    03-15-2016, 12:11 PM Go to last post
  9. Calculating Cohen's d with alternative information

    I am trying to calculate the effect size from three different articles using Cohen's d. The first was straight forward - they provided the group...

    Started by mendyrnp‎, 03-15-2016 09:24 AM
    • Replies: 0
    • Views: 1,282
    03-15-2016, 09:24 AM Go to last post
  10. Intro Stats Books- How valid and representative of real world applications?

    I have an Intro Statistics book by Neil Weiss 9th edition. It is a pretty informative book that covers the basics as would any Intro Stats book....

    Started by StilloftheNight‎, 03-14-2016 08:36 PM
    • Replies: 2
    • Views: 1,455
    03-15-2016, 09:16 AM Go to last post
  11. Which type of statistical test to use?

    Hi i am seeking help on which type of statistical test i need to use here. I gather it is an ANOVA but what kind of ANOVA would it be? THANKS IN...

    Started by Jamifin‎, 03-15-2016 06:15 AM
    • Replies: 1
    • Views: 2,088
    03-15-2016, 09:14 AM Go to last post
  12. Need help with complex sample size calculation

    What sample size (n) is required to identify a "significant" correlation between k binomial variables (predictors) and another binomial variable...

    Started by KelvinS‎, 03-15-2016 05:44 AM
    • Replies: 0
    • Views: 1,607
    03-15-2016, 05:44 AM Go to last post
  13. Sampling issue

    I want to be able to make comparisons between a specifically selected sample (based on ethnicity) and a randomnly selected sample from the general...

    Started by Luna16‎, 03-14-2016 06:50 PM
    comparison, sample, sampling
    • Replies: 0
    • Views: 1,467
    03-14-2016, 06:50 PM Go to last post
  14. Find Correlations

    Let's say I have some samples, that I gathered per second, like these Number km Benzine Speed Weight 1 10 100 80 100...

    Started by jimakos17‎, 03-14-2016 05:44 PM
    correlation, correlation analysis, correlation coefficients, relationships
    • Replies: 0
    • Views: 1,682
    03-14-2016, 05:44 PM Go to last post
  15. Confidence Interval Problem

    Assume that you have a 95% confidence interval for a population mean based on a sample size of n1 = 50. If you wish to have a confidence interval of...

    Started by surajthemighty‎, 03-14-2016 05:41 PM
    • Replies: 0
    • Views: 2,243
    03-14-2016, 05:41 PM Go to last post
  16. Using The Pearson Correlation Coefficient on a Time Series

    Hi everybody, I have a question about using the Pearson Correlation Coefficient on a time series. The time series has 23,000 data points. I...

    Started by lamchops‎, 03-10-2016 10:13 PM
    • Replies: 2
    • Views: 1,849
    03-14-2016, 01:45 PM Go to last post
  17. Variance main effect influencing interaction effect

    Does variance of one of the two main effects in a 2-way (ANOVA) interaction influence the significance of the interaction effect? Two analyses are...

    Started by Stanny‎, 03-14-2016 09:17 AM
    2-way anova, variance
    • Replies: 0
    • Views: 1,820
    03-14-2016, 09:17 AM Go to last post
  18. Finding probability using normal distribution

    I've searched this question on other forums. There are people who are saying that n = 197 and some are putting n = 200. I feel like 200 is the right...

    Started by asilvester635‎, 03-13-2016 06:10 PM
    • Replies: 1
    • Views: 1,952
    03-13-2016, 11:23 PM Go to last post
  19. Can't Figure this Out

    4. Suppose public opinion is split 65% against and 35% for increasing taxes to help balance the federal budget. Suppose also that 500 people from the...

    Started by surajthemighty‎, 03-13-2016 07:06 PM
    • Replies: 1
    • Views: 2,415
    03-13-2016, 07:53 PM Go to last post
  20. Need help with some Statistics Questions

    1. For a car traveling 60 kilometers per hour (km/h), the distance required to brake to a stop is normally distributed, with mean of 17 meters and a...

    Started by surajthemighty‎, 03-13-2016 05:57 PM
    • Replies: 0
    • Views: 2,976
    03-13-2016, 05:57 PM Go to last post
  21. Relationship between effect size, sample size and p-value?

    Is there a simple formula that links effect size, sample size and p-value? Specifically, how does the p-value depend on effect size and sample...

    Started by KelvinS‎, 03-13-2016 07:47 AM
    effect size, p-value, sample size
    • Replies: 8
    • Views: 4,863
    03-13-2016, 03:24 PM Go to last post
  22. The brand of light bulb you use at home...

    The brand of light bulb you use at home has an average life of 900 hours. A manufacturer claims that its new brand of bulbs, which cost the same as...

    Started by brooke‎, 03-12-2016 12:18 PM
    • Replies: 5
    • Views: 1,788
    03-13-2016, 02:52 PM Go to last post
  23. Unhappy Cumulative risk calculation

    Hi Guys I recently attended a lecture where the presenter stated that: "The risk of having a stroke for this particular person in year 1 is...

    Started by skaur‎, 03-12-2016 05:50 AM
    • Replies: 3
    • Views: 1,605
    03-12-2016, 03:25 PM Go to last post
  24. sampling question.

    I was given this question and I'm looking for an answer. The question is.. "The client of an email process has specified that the % of A or B...

    Started by devagupt‎, 03-12-2016 12:30 AM
    sampling
    • Replies: 1
    • Views: 1,179
    03-12-2016, 09:38 AM Go to last post
  25. Talking Ordinal logistic regression vs linear regression?

    Hi Guys, just wondering if I could have your help pls. I have a sample size of 55 patients (of which 22 were subsequently diagnosed with Heart...

    Started by skaur‎, 02-25-2016 05:09 AM
    • Replies: 5
    • Views: 2,072
    03-12-2016, 08:08 AM Go to last post
  26. What does this mean?

    the ratio of the square of the correlation of the "estimated y" values to the square of the correlation of the "observed y" values Could square of...

    Started by vigor‎, 03-11-2016 07:10 PM
    • Replies: 2
    • Views: 1,853
    03-12-2016, 07:18 AM Go to last post
  27. the significance level of the test...

    2. Let X be a Bin(100,p). To test H0 : p = 0.08 against H1 = p < 0.08, we reject H0 if and only if X <= 6. a. Determine the significance level of...

    Started by brooke‎, 03-12-2016 04:01 AM
    • Replies: 0
    • Views: 1,481
    03-12-2016, 04:01 AM Go to last post
  28. [SPSS] comparing a value over time: how to analyze the trend?

    Hello everyone, I'm trying to understand how to analyze a trend in the correct way. I've seen a lot of videos/tutorials and read some books but I...

    Started by LittleJonckheere‎, 03-04-2016 12:14 PM
    • Replies: 2
    • Views: 1,708
    03-12-2016, 03:44 AM Go to last post
  29. Mixed model analysis

    I would greatly appreciate any help constructing a model to analyze the variation in strontium-to-carbon ratios in 204 fish otoliths (1 otolith per...

    Started by mtwilson‎, 03-11-2016 06:32 PM
    blocked, covariates, lmer, nested
    • Replies: 0
    • Views: 907
    03-11-2016, 06:32 PM Go to last post
  30. Ordinal survey, 2 groups: looking for correlation between groups

    Hi I have an ordinal data set across 50 survey questions (same response scale for each question). The data is non-normally distributed for each...

    Started by Ivan Teage‎, 03-09-2016 04:20 PM
    • Replies: 1
    • Views: 1,780
    03-11-2016, 01:05 PM Go to last post
  31. Which statistical test to use?

    Hi, I'm struggling with the following; I have two dependent variables (A and B) which are continous and highly correlated with each other...

    Started by Solingen_1‎, 03-11-2016 08:14 AM
    mixed model, pairwise t-test
    • Replies: 2
    • Views: 1,564
    03-11-2016, 10:35 AM Go to last post
  32. R^2 definition (HW question)

    Please weigh in on the accuracy of this definition: The coefficient of determination describes the percentage of the total variation that is...

    Started by vigor‎, 03-11-2016 09:27 AM
    • Replies: 0
    • Views: 1,112
    03-11-2016, 09:27 AM Go to last post
  33. Basic question on dealing with nominal IVs

    Hi all Let's imagine we have 3 columns: Country (with 30 levels, but entirely nominal), GDP (continuous) and voter turnout (continuous) How...

    Started by drewmac‎, 03-10-2016 02:25 PM
    • Replies: 3
    • Views: 1,898
    03-11-2016, 06:16 AM Go to last post
  34. Question Statistical analysis help

    So I am working on the analysis of this experiment and I am trying to see what is the best statistical analysis method to use ( t-test, ANOVA, ......

    Started by emptiness‎, 03-10-2016 03:12 PM
    • Replies: 0
    • Views: 1,089
    03-10-2016, 03:12 PM Go to last post
  35. Estimate individual variance from pool variance

    Let's say I have a group of 100 tiny beads, and I want to know the variance in their weight. However, my scale can't weigh one bead at a time, so I...

    Started by Frameshift‎, 03-10-2016 11:54 AM
    individual, pooled, variance
    • Replies: 7
    • Views: 1,654
    03-10-2016, 01:11 PM Go to last post
  36. Behavioral statistics for radial 8 arm maze

    I am having trouble looking for the right statistical test. My experiment: Rats (n=20) RAM (radial 8 arm maze): in each entrance a pad with...

    Started by Vaishali‎, 03-10-2016 09:41 AM
    behavioral experiment, capsaicin, radial eight arm maze, ram
    • Replies: 0
    • Views: 1,256
    03-10-2016, 09:41 AM Go to last post
  37. Multivariate statistics - Using adonis to compare assemblages

    Hi I am looking at the difference in assemblage colonisation on two artificial settlement tiles (plastic and slate) and the data has been recorded...

    Started by saz‎, 03-10-2016 08:44 AM
    • Replies: 0
    • Views: 1,228
    03-10-2016, 08:44 AM Go to last post
  38. Sample Distribution Probability (unsure if correct answer)

    1. Carlinville, Illinois, has just started an ambitious recycling program. Special trucks collect recyclable products once a week, sorted into...

    Started by vil33‎, 03-09-2016 06:45 PM
    normal, population, proability, sample distribution
    • Replies: 0
    • Views: 2,161
    03-09-2016, 06:45 PM Go to last post
  39. Question Std. Error Multiple Regression Question

    Hi guys, I'm stuck at interpreting the stadard error. In single regression it's clear, it's just the average distance from the line. But I don't...

    Started by sumie‎, 03-08-2016 07:25 AM
    error, multiple, question, regression, standard error
    • Replies: 4
    • Views: 1,707
    03-09-2016, 02:48 PM Go to last post
  40. N trials, 3 possible outcomes

    I have n independent trials, where the result of each trial is either A, B or C, with probabilities a, b and c respectively, so that a + b + c = 1. ...

    Started by KelvinS‎, 03-09-2016 06:26 AM
    trinomial
    • Replies: 8
    • Views: 1,349
    03-09-2016, 12:37 PM Go to last post
  41. Help with interpretation of Confidence Interval

    Hi guys For my homework, one of the questions asks us to select all interpretations that are correct for a confidence interval. Currently, I...

    Started by echan527‎, 03-08-2016 06:41 PM
    • Replies: 0
    • Views: 1,429
    03-08-2016, 06:41 PM Go to last post
  42. Goodness-of-fit test

    I have a question regarding goodness-of-fit tests. A general rule of thumb with the chi-square test of goodness of fit is that (1) no more than 20%...

    Started by jackson3000‎, 03-07-2016 08:02 PM
    chi square, goodness of fit
    • Replies: 6
    • Views: 2,002
    03-08-2016, 05:03 PM Go to last post
  43. unbiased estimator assumptions

    Are all of these assuptions required for the least square estimator of slope to be unbiased? 1) errors are normally distributed 2) errors have...

    Started by calypso‎, 01-03-2016 09:56 AM
    • Replies: 6
    • Views: 2,518
    03-08-2016, 03:34 PM Go to last post
  44. Statistical difference between two means

    I have observations in my study on setback distances for wind turbines. I have the mean value for two setback distances, one close and one further...

    Started by Puffin‎, 03-08-2016 10:31 AM
    • Replies: 2
    • Views: 1,330
    03-08-2016, 12:16 PM Go to last post
  45. [SOLVED] t test advice. Anyone able to help me a little here?

    Hi there everyone, I'm a diagnostic radiography student, currently working on a research proposal and to be honest, I'm having an absolute...

    Started by ubertank‎, 03-07-2016 10:54 AM
    • Replies: 1
    • Views: 1,857
    03-07-2016, 03:54 PM Go to last post
  46. A study was carried out to investigate whether the type of milk used is the same ....

    A study was carried out to investigate whether the type of milk used is the same among young people as among older ones. A sample of 500 people...

    Started by brooke‎, 03-06-2016 02:43 PM
    • Replies: 4
    • Views: 1,668
    03-07-2016, 02:35 PM Go to last post
  47. Choosing the Correct Analysis - Comparing Categorical Independent Variables (STATA)

    So I want to compare the rates of infection in patients who received drugs A, B, C, and D. Patients could have received one, two, three, or all four...

    Started by Ryan227‎, 03-07-2016 01:51 PM
    help please, logistic regression, stata
    • Replies: 0
    • Views: 857
    03-07-2016, 01:51 PM Go to last post
  48. Directional Test Help

    Directional test (H1:M<μ) In the city there is normally a mean of 75 parking tickets issued per officer with a standard deviation of 12. The...

    Started by krystal1994‎, 03-07-2016 12:45 PM
    • Replies: 1
    • Views: 1,050
    03-07-2016, 01:43 PM Go to last post
  49. Am I using the right model and how to deal with missing values in a SPSS GLMM

    Dear all, I hope I will find somebody here who can help me a bit with my SPSS problems. I have a relatively complex dataset that comes from an...

    Started by Fred.‎, 03-07-2016 11:27 AM
    • Replies: 0
    • Views: 1,283
    03-07-2016, 11:27 AM Go to last post
  50. Proportional Sampling

    I have 30 people in a sample. In group A there are 20 people and in group B there are 10 people. I need to sample 20 people without replacement. ...

    Started by superships‎, 03-07-2016 09:18 AM
    • Replies: 0
    • Views: 662
    03-07-2016, 09:18 AM Go to last post
  51. Comparing mortality rates? 2-sample t-test vs Chi sq vs Poisson regression vs others

    Hi there, Sorry for my ignorance but been a while since I did stats. I am comparing mortality rates between two breeds of pigs. My ultimate...

    Started by shwanal‎, 03-07-2016 05:50 AM
    chi-square, mortality rates, poisson
    • Replies: 1
    • Views: 1,535
    03-07-2016, 07:17 AM Go to last post
  52. Cox regression with varying data completion

    Gentlemen Many thanks for providing a fantastic resource in many previous projects, I have often found very helpful answers to simple questions...

    Started by wb123‎, 03-07-2016 05:25 AM
    hazard ratio, idiot question, regression
    • Replies: 0
    • Views: 1,139
    03-07-2016, 05:25 AM Go to last post
  53. Question How many tickets were sold ?

    Suppose raffle tickets were sold for a charitable fundraising. The responsible organization sold many tickets, but you had no idea what was the...

    Started by martinl‎, 03-07-2016 02:00 AM
    • Replies: 0
    • Views: 1,201
    03-07-2016, 02:00 AM Go to last post
  54. Distribution normality test

    Dear friends, please assist. I have data set (sales) and before treating it as normal distributed data for my homework I need to test it for...

    Started by vladimirsaveljev‎, 03-05-2016 01:35 PM
    • Replies: 3
    • Views: 1,969
    03-06-2016, 05:38 PM Go to last post
  55. Standard errors from non-random samples

    I've been analyzing an insurance claims database from a non-random convenience sample of claims from individuals with employer-sponsored insurance...

    Started by subharimc‎, 03-06-2016 09:06 AM
    • Replies: 2
    • Views: 1,252
    03-06-2016, 11:34 AM Go to last post
  56. Continous-probability function, cumulative

    Hello again, second time posting here now, tried my luck once and you guys were very helpful so i will try again: The first is concerning the...

    Started by jhjahren‎, 03-03-2016 07:13 AM
    • Replies: 2
    • Views: 1,142
    03-06-2016, 02:46 AM Go to last post
  57. Do percentile rankings from a weighted average have identical distributions?

    I was wondering if you could help me figure this out. I'm at a school that determines class rank for a year by a percent rank of scores determined by...

    Started by derivativegradient‎, 03-05-2016 09:06 PM
    • Replies: 0
    • Views: 1,190
    03-05-2016, 09:06 PM Go to last post
  58. Reliability/Validity - Removing/Reverse Coding

    I'm working on an assignment where we are evaluating the reliability and validity of a survey. Using SPSS, we were to find the possible min.-max.,...

    Started by lmhinx‎, 03-04-2016 09:58 PM
    • Replies: 1
    • Views: 934
    03-05-2016, 10:16 AM Go to last post
  59. Bootstrapping with One-way ANOVA design and confidence interval

    Hello, I am new to this forum, and I need some helps in bootstrapping. I am using Matlab. So, here's the study design: I have three groups...

    Started by kojinet‎, 11-14-2012 04:40 PM
    anova, bootstrap, confidence interval, matlab, percentile
    • Replies: 2
    • Views: 3,291
    03-04-2016, 07:43 PM Go to last post
  60. What Test To Use?

    Hi guys, I am totally stuck trying to perform statistical tests for my project and was wondering if somebody could help? Basically, I distributed...

    Started by Phizpop‎, 03-02-2016 11:53 AM
    • Replies: 2
    • Views: 1,742
    03-04-2016, 12:19 PM Go to last post

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