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 11:13 AM
    • Replies: 1
    • Views: 74,037
    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: 25,971
    09-30-2005, 09:44 AM Go to last post
  1. Type of data

    Could any one please tell how to identify type of data for example in this question, "A randomised placebo control study of a new drug for...

    Started by Nadeem‎, Today 05:42 AM
    • Replies: 1
    • Views: 55
    Today, 08:03 AM Go to last post
  2. Measuring agreement between categorical and continuous variables

    Hi all, First post here. I'm currently measuring agreement between continuous and categorical variables that are also in different units of...

    Started by FightingBull‎, 10-22-2014 04:27 PM
    agreement, method comparison
    • Replies: 1
    • Views: 180
    Today, 07:58 AM Go to last post
  3. There are no valid cases for VAR when GRP = .. Statistics cannot be computed for this

    When I perform a normality test for my variables using the grouping variable named "Group", I got a warning message telling me that there are values...

    Started by tonia bird‎, Today 07:47 AM
    • Replies: 0
    • Views: 2
    Today, 07:47 AM Go to last post
  4. Longitudinal Likert Analysis

    Hi All, I'm doing some analysis on some likert data for a research project and I'm somewhat out of my depth right now. I have a control group...

    Started by scottwc‎, Today 02:07 AM
    • Replies: 1
    • Views: 98
    Today, 06:29 AM Go to last post
  5. Need help starting this question; unable to identify what type of question it is

    I can't tell if its asking for a binomial distribution or a normal probability distribution.. or maybe an approximation of a binomial distribution...

    Started by carletonUstudent‎, Yesterday 06:59 PM
    binomial, distribution, normal, statistics
    • Replies: 1
    • Views: 134
    Yesterday, 09:34 PM Go to last post
  6. Can I do a two-way ANOVA on this data?

    Hi, I have find whether there is significant difference in score between two groups over time. The data is pooled cross sectional. The table is...

    Started by sant2910‎, 10-30-2014 12:37 PM
    two-way anova
    • Replies: 5
    • Views: 214
    Yesterday, 08:38 AM Go to last post
  7. Repeated-Measures for men and women viewing opposite sex visual stimuli?

    In advance, thank you for any insight you can provide on the following. My study: Men and women viewing different (opposite sex) stimuli (2...

    Started by KarmaRose‎, 10-29-2014 11:57 PM
    • Replies: 5
    • Views: 190
    Yesterday, 06:09 AM Go to last post
  8. Inferential statistics, calculating p

    Hi everyone, Firstly, I understand that if I had more time to study statistics from a basic enough waypoint, I could answer this question myself....

    Started by elguapador‎, Yesterday 03:42 AM
    inferential statistics
    • Replies: 0
    • Views: 83
    Yesterday, 03:42 AM Go to last post
  9. How many finishing combinations in a race?

    Hi easy question I should be able to work out myself but now regret not listening in class. How many overall finishing combinations are there in a...

    Started by Speedymetric‎, Yesterday 02:39 AM
    • Replies: 0
    • Views: 117
    Yesterday, 02:39 AM Go to last post
  10. Repeated Measures ANOVA - correct test to use?

    Hi all, Newbie here and a relative statistics novice. . . I have a simple study design with two groups and a basic intervention (learning...

    Started by Neuroscientist911‎, 10-28-2014 08:32 AM
    • Replies: 2
    • Views: 205
    10-30-2014, 09:04 AM Go to last post
  11. Smile Interaction effect of group (IV) and questionnaire type (DV) - Possible with MANOVA?

    I already tried google and also the forum search - unfortunately I didn't find any good answer to my question: I want to know whether my two groups...

    Started by HannahS‎, 10-30-2014 08:02 AM
    effect sizes, interaction effect, multivariate analysis
    • Replies: 0
    • Views: 118
    10-30-2014, 08:02 AM Go to last post
  12. Lightbulb Standard Deviation, Central Theorem, and confidence interval????

    So lost on my extra credit due tomorrow and I don't have a book. Anyway a few questions. #1 The weight of 6 week old poults are normally...

    Started by merry13‎, 10-30-2014 01:09 AM
    p(x<x) = 0.01
    • Replies: 0
    • Views: 158
    10-30-2014, 01:09 AM Go to last post
  13. chi square tests and grouping

    I have a set of 130 people which I need to divide into groups of 5 that are proportionate in academic major and gender in comparison to the overall...

    Started by tedmitt‎, 10-29-2014 07:48 PM
    • Replies: 0
    • Views: 160
    10-29-2014, 07:48 PM Go to last post
  14. Comparing data from multiple samples - which model?

    Hello My job is to measure electrical characteristics of transistors e.g. onset voltage or threshold voltage. Every wafer I test has roughly 4000...

    Started by pete900‎, 10-14-2014 08:56 AM
    • Replies: 9
    • Views: 520
    10-29-2014, 10:26 AM Go to last post
  15. Post Statistics Problem

    Hello, I am trying to solve the problem below but am not sure how to go about it. Does anyone have any ideas or advice on how to solve this problem?...

    Started by mjh113438‎, 10-28-2014 09:09 PM
    t distribution
    • Replies: 2
    • Views: 189
    10-29-2014, 02:33 AM Go to last post
  16. How to find importance of an independant variable on a binary variable

    I am trying to learn statistics to help with my understanding of data I am getting in for the business I work for. I have a variable on whether...

    Started by ryanbeckham‎, 10-28-2014 03:18 PM
    logistic, survival analysis
    • Replies: 6
    • Views: 248
    10-29-2014, 01:50 AM Go to last post
  17. parameter estimation based on observed survival probabilities

    Say 100 samples have been pulled from a Normal distribution with unknown mean and variance. All I know about the results are the following: 23...

    Started by schleprock‎, 10-24-2014 04:38 PM
    2 Pages
    1 2
    maximum likelihood
    • Replies: 28
    • Views: 545
    10-28-2014, 04:39 PM Go to last post
  18. Missing Values with Count Data

    So, I have a question that I cannot figure out. I've looked in the literature and can't really find a solution. Maybe I'm looking in the wrong place,...

    Started by muelledg‎, 10-24-2014 02:43 PM
    • Replies: 4
    • Views: 240
    10-28-2014, 01:36 PM Go to last post
  19. Quality assurance statistical analysis

    I received a question but am not certain how to approach a response concerning a Q.A. analysis. I've read the chapter from the book concerning this...

    Started by augustus‎, 03-14-2013 12:04 AM
    • Replies: 4
    • Views: 847
    10-28-2014, 11:37 AM Go to last post
  20. Wink Taxon Distribution 3 treatments comparison, T test

    Hello, ive developed 3 models wich predict the extent of area covered by a taxon. what statistical test could be useful for comparing the 3...

    Started by jos19‎, 10-27-2014 09:35 PM
    taxon distribution
    • Replies: 3
    • Views: 231
    10-28-2014, 08:17 AM Go to last post
  21. Please please please help me

    Hi, I'm really hoping that someone on here can help me. I'm sure this is going to be something ridiculously simple for someone but I am struggling...

    Started by nickauger‎, 10-27-2014 03:04 PM
    please help
    • Replies: 14
    • Views: 336
    10-28-2014, 08:00 AM Go to last post
  22. Help With Repeated Measures ANOVA

    Okay, so I have got 15 subjects, who had to perform a repeated sprint test (5 sprints) twice one with a supplement then the other with a placebo the...

    Started by AJW1995‎, 10-27-2014 05:27 AM
    repeated measures
    • Replies: 2
    • Views: 179
    10-27-2014, 07:15 PM Go to last post
  23. Chi square observed frequencies help please

    Hi there If anyone could help me , with what is probably a really simple/stupid question, I would be so grateful! It is not through lack of trying...

    Started by Jimjamyaha‎, 10-27-2014 06:05 PM
    chi square, expected frequencies, odds ratio
    • Replies: 0
    • Views: 156
    10-27-2014, 06:05 PM Go to last post
  24. Fligner and Pollicello's robust rank order test: critical values

    Hello Statistics Forum, I am using Fligner and Pollicello's robust rank-order (RRO) test to detect differences in central tendency between two...

    Started by eric_cartman‎, 10-27-2014 02:15 PM
    non-parametric test, robust rank-order test
    • Replies: 0
    • Views: 174
    10-27-2014, 02:15 PM Go to last post
  25. variables

    Hi I have a statistic module in my course of study and i hate it. I struggle dealing with numbers and stuff so i am here because i need help! Iam...

    Started by bruno80‎, 10-27-2014 09:32 AM
    • Replies: 3
    • Views: 183
    10-27-2014, 01:50 PM Go to last post
  26. Confidence interval for a simple survey result

    I recently surveyed 200 organisations to establish a number of key facts about them including the number of staff. 160 of them responded with the...

    Started by John Best‎, 10-27-2014 10:07 AM
    • Replies: 0
    • Views: 136
    10-27-2014, 10:07 AM Go to last post
  27. Please help me! I have some doubt about collecting the data.

    Can someone please tell me how to calculate the correct numbers of questionnaire for the sample size? I have 2 questions. 1. If I use a required...

    Started by togorius01‎, 10-27-2014 03:10 AM
    • Replies: 0
    • Views: 147
    10-27-2014, 03:10 AM Go to last post
  28. Minimum variance for sum of three random variables

    Hi all, I have been working on the following problem: Given you have VarX = 1, VarY = 4, and VarZ = 25, what is the minimum possible variance...

    Started by skijunkie‎, 10-23-2014 12:34 PM
    • Replies: 2
    • Views: 188
    10-24-2014, 11:02 PM Go to last post
  29. calculating probability of disease according to age

    I'm making a program which, at one point, is supposed to estimate the probability of having a certain disease based on the patient's age. I'm going...

    Started by justry‎, 10-23-2014 04:08 PM
    age, disease, mean 1, probability, standard deviation
    • Replies: 13
    • Views: 347
    10-24-2014, 02:27 PM Go to last post
  30. which test to use

    Hi guys, I am not a statistician, but need to do a small project. (sorry if this sounds too easy for you). I've done my homework, just want to check...

    Started by EricaW‎, 10-23-2014 02:23 PM
    • Replies: 1
    • Views: 206
    10-23-2014, 03:47 PM Go to last post
  31. Sample Mean and Standard Deviation affects results to support reject Null Hypothesis

    Hi All, I'm pretty new to Hypothesis Testing and I've come across a question I'm not sure of and was hoping someone could explain it. Suppose...

    Started by Stats_Beginner‎, 10-23-2014 01:28 PM
    alternative hypothesis, hypothesis testing, null hypothesis
    • Replies: 2
    • Views: 152
    10-23-2014, 03:42 PM Go to last post
  32. Should I include p-values in a Census type data?

    Hello guys, I am conducting a study that compares rates of CIF (Client Intake Forms) completion collected among via self-administered paper-based...

    Started by Marvin85‎, 10-23-2014 03:27 PM
    census, p-values
    • Replies: 0
    • Views: 141
    10-23-2014, 03:27 PM Go to last post
  33. very large exp(B) value - seems strange

    Hi, I ran a logistic regression in SPSS with two dichotomous categorical predictors and their interaction to predict my dichotomous outcome...

    Started by jamie157‎, 10-21-2014 11:20 AM
    • Replies: 10
    • Views: 309
    10-23-2014, 01:26 PM Go to last post
  34. Help with Hypothesis Testing!!!

    Hi everybody, I really need help with this please!! I got this function : f(x|c)=1+c^2(x-1/2) with 0<=x=<1 and 0<=c=<root of 2 and I have...

    Started by Shaf‎, 10-23-2014 07:11 AM
    • Replies: 2
    • Views: 185
    10-23-2014, 11:09 AM Go to last post
  35. Minimum 5 defectives rule of thumb

    I have taught six sigma black belt classes using consultant sourced training materials which included the rule of thumb that when estimating the rate...

    Started by grahahw‎, 10-23-2014 09:46 AM
    attribute, sample size
    • Replies: 0
    • Views: 88
    10-23-2014, 09:46 AM Go to last post
  36. t - test for after regression analysis

    I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

    Started by sandip2k1in‎, 10-22-2014 11:26 AM
    • Replies: 0
    • Views: 188
    10-22-2014, 11:26 AM Go to last post
  37. Unique " t - test" - Kindly help

    I want to find the dominant one among two theories which give predictions about the relationships between one dependent variable( Y ) and some...

    Started by sandip2k1in‎, 10-22-2014 04:10 AM
    t-test two-sample
    • Replies: 0
    • Views: 182
    10-22-2014, 04:10 AM Go to last post
  38. SD/SE of Percentage Question

    Have a question that's probably painfully easy to address. Little slow. I am sampling from a hypothetical infinite population with an unknown...

    Started by Enrique‎, 10-22-2014 12:31 AM
    • Replies: 1
    • Views: 162
    10-22-2014, 01:01 AM Go to last post
  39. CLT and sample distribution of sample mean

    On a particular stretch of highway, the state police know that the average speed is 62 mph with a standard deviation of 5 mph. On a busy holiday...

    Started by ajc‎, 10-20-2014 10:38 PM
    • Replies: 1
    • Views: 260
    10-21-2014, 10:25 AM Go to last post
  40. Can someone help me to answer in my research homework

    I am studying a basic research course and making an assumed research project. The sample size I used is 120 people calculated by using a conservative...

    Started by togorius01‎, 10-19-2014 11:37 PM
    • Replies: 3
    • Views: 273
    10-20-2014, 10:19 PM Go to last post
  41. Calculating Bayes statistic from a t-test result

    Hi, Part one of the study in question analysed whether participants had a preference for chocolate when eating alone compared to eating with someone...

    Started by op2222‎, 10-18-2014 06:56 AM
    • Replies: 1
    • Views: 259
    10-20-2014, 05:14 PM Go to last post
  42. using theoretical probability

    I read an article recently where the author generates randomized profit data based on a %Win and Profit Factor. Based on this data's standard...

    Started by dalai‎, 10-10-2014 01:14 AM
    • Replies: 3
    • Views: 287
    10-20-2014, 02:03 PM Go to last post
  43. Central Limit Theorm Basics Help

    First time on boards, nice to meet you all! I need a little help understanding my homework, some of the notations are putting roadblocks on me...

    Started by Meteo‎, 10-20-2014 12:57 PM
    • Replies: 4
    • Views: 221
    10-20-2014, 01:52 PM Go to last post
  44. Universe size vary between original and the material to compare

    This might seem quite trivial to a stats whizz but I just can't wrap my head around it. So right now, I'm working on a project to validate the...

    Started by Schweutsch‎, 10-20-2014 02:08 AM
    ocr evaluation, variyng universe
    • Replies: 1
    • Views: 223
    10-20-2014, 10:20 AM Go to last post
  45. Determine Mean and Standard Deviation from Z-Score

    The instructor announces that 75 percent of students scored above the mean. How do you reconcile this with the fact that, in a normal distribution,...

    Started by Raybob‎, 10-19-2014 04:13 PM
    • Replies: 3
    • Views: 334
    10-20-2014, 10:09 AM Go to last post
  46. Testing Hypotheses about Means and Proportion

    Hello Everyone! I am having trouble with one of my questions it goes: It is claimed that fewer than 30% of Thunder Bay households have home...

    Started by Sharp‎, 10-19-2014 11:28 AM
    hypotheses testing
    • Replies: 5
    • Views: 288
    10-19-2014, 11:26 PM Go to last post
  47. Elementary Statistics Help - Video Lessons

    I'm looking for some useful video lessons for elementary statistics. I've stumbled into some pretty good youtube lessons online from Dr. Nic at...

    Started by monkeykeeper‎, 10-19-2014 01:41 AM
    statistics video lessons
    • Replies: 0
    • Views: 221
    10-19-2014, 01:41 AM Go to last post
  48. Nested Models

    Going through this concept for the first time. The literature's and teacher's explanations make sense nominally: "Two models are nested if both...

    Started by JTWood‎, 10-18-2014 09:17 PM
    • Replies: 2
    • Views: 179
    10-18-2014, 10:14 PM Go to last post
  49. type of regression model

    Which type of regression model is it y=a+bx+e

    Started by sara b‎, 01-16-2014 10:25 AM
    • Replies: 10
    • Views: 448
    10-18-2014, 03:40 PM Go to last post
  50. L1 distance between empirical and true distribution for discrete distributions

    I have a discrete distribution over the set {1, \ldots, d} with a corresponding pmf P. Given a dataset with n i.i.d. samples from P, I compute the...

    Started by jyojyon‎, 10-18-2014 01:39 PM
    density estimation, empirical distribution
    • Replies: 0
    • Views: 187
    10-18-2014, 01:39 PM Go to last post
  51. Regression model with no constant term & more

    Hi guys, There are a bunch of things that I'm getting confused about and while I've researched online for resources to get clarification, I'm...

    Started by excelmac‎, 10-18-2014 10:28 AM
    no constant term model, regression, time series
    • Replies: 2
    • Views: 221
    10-18-2014, 11:21 AM Go to last post
  52. "Linear at the Parameters"

    I'm having a hard time with this concept. I've read as many different sources on this terminology as I can find, but it seems that most of them...

    Started by JTWood‎, 10-18-2014 07:31 AM
    • Replies: 5
    • Views: 261
    10-18-2014, 09:09 AM Go to last post
  53. Independents and dependents Events

    I've been sitting on this problem for awhile. i cannot figure it out. i looked in the back of the book for the answer ( independent; .000507) i've...

    Started by iDoThis‎, 09-24-2014 09:29 PM
    • Replies: 1
    • Views: 318
    10-17-2014, 08:19 PM Go to last post
  54. Partial Correlation

    Hello everybody, normally I wouldn't use a forum but this is a last resort. 3. SQ3: Is there a linear relationship between engine size and...

    Started by jfrancx‎, 10-17-2014 05:47 PM
    • Replies: 0
    • Views: 140
    10-17-2014, 05:47 PM Go to last post
  55. Type I and Type II Error

    Let {X1, X2, ..., X25} be a random sample of 25 observations from a normal population havingmean μ and variance 2. Define the null hypothesis H0 : μ...

    Started by oharman‎, 10-17-2014 07:34 AM
    • Replies: 3
    • Views: 246
    10-17-2014, 02:38 PM Go to last post
  56. Testing is a sample has been rigged??

    Hello All, This is my first post so please be gentle, I did applied stats 22 years ago as part of my Physics degree but that was, well, 22 years...

    Started by Andy Carr‎, 10-17-2014 03:24 AM
    sample rigging random
    • Replies: 3
    • Views: 261
    10-17-2014, 02:37 PM Go to last post
  57. ANOVA contrast coding for 4 groups.

    Hello, I have four groups 1, 2, 3, and 4, and I'm trying to compare the average of 1 and 2 vs. group 3 and group 4 (note not the average of group...

    Started by mbetennis01‎, 10-17-2014 09:08 AM
    contrast coefficients
    • Replies: 2
    • Views: 213
    10-17-2014, 12:47 PM Go to last post
  58. Analysing a rank order

    Hi all, I am a doctor who have absolutely close to 0 knowledge about statistics. Here is my problem, Imagine a situation where 1000 students...

    Started by Lasitha‎, 10-12-2014 12:56 AM
    • Replies: 2
    • Views: 351
    10-16-2014, 10:03 AM Go to last post
  59. How to plot non-parametric data with multiple time points?

    Hello, I analyzed some physiologic data (blood electrolyte levels etc) which was fairly skewed, so I used Kruskal-Wallis to test for differences...

    Started by awolf‎, 10-16-2014 09:21 AM
    interquartile range, kruskal wallis, non-parameteric, plot, standard deviation
    • Replies: 0
    • Views: 218
    10-16-2014, 09:21 AM Go to last post
  60. Testing the Normality of Errors in Regression?

    Hi all, I have simple conceptual question: In the simple linear regression problem, where the true relationship is, y = ax + b + e the...

    Started by mity‎, 10-15-2014 10:57 AM
    correlated errors, normality, regresion analysis, residual
    • Replies: 4
    • Views: 411
    10-16-2014, 12:37 AM Go to last post

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