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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: 196,682
    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: 66,707
    09-30-2005, 09:44 AM Go to last post
  1. Unhappy I need to solve step by step these statistic problems

    I need to solve step by step these statistic problems, please do not use software, statistic tables are ok

    Started by luckystar‎, 11-23-2014 04:33 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 4,384
    12-01-2014, 06:56 PM Go to last post
  2. Sampling: Stratified with proportional allocation vs. Simple Random Sampling

    Hello, My question is about a proof in Lohr's Sampling: Design and Analysis. I have no clue what happened in the last step(which I outlined in the...

    Started by kb24‎, 12-01-2014 05:16 PM
    • Replies: 0
    • Views: 1,018
    12-01-2014, 05:16 PM Go to last post
  3. Completely lost in HW

    I have some questions that I need help with. I have a few hours today, if there is anyone out there who could help me. I would truly appreciate it....

    Started by striker_000‎, 12-01-2014 09:12 AM
    • Replies: 5
    • Views: 1,677
    12-01-2014, 10:32 AM Go to last post
  4. Homework help, want to check my method for probability and hypothesis test

    I would be most obliged if someone would look at my solution and advise if my method and answers are correct. Mean lifetime of brand X bulbs is...

    Started by PeterVincent‎, 12-01-2014 08:12 AM
    binomial probability, hypothesis test, probability homework help
    • Replies: 0
    • Views: 1,898
    12-01-2014, 08:12 AM Go to last post
  5. 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: 6
    • Views: 1,901
    12-01-2014, 04:55 AM Go to last post
  6. Anybody give me idea about my solution?

    My solution is n =30, = 0.795, s^2 =0.000586 99% confidence interval of σ = (0.018,0.036)

    Started by luckystar‎, 12-01-2014 12:50 AM
    • Replies: 0
    • Views: 1,416
    12-01-2014, 12:50 AM Go to last post
  7. t test or wilcoxon signed rank test?

    Hope you can help me. I am currently doing a masters research proposal (experiment hasn't been completed yet) and need to decide what statistical...

    Started by nickyk11‎, 11-30-2014 06:09 PM
    • Replies: 3
    • Views: 1,553
    11-30-2014, 08:33 PM Go to last post
  8. ANOVA Help - why is my r-sq pred at 0%?

    Hi All I am currently conducting a Central composite design. It is full design with 3 factors. I have double checked my data entry and everything...

    Started by xbarcrawl‎, 11-28-2014 06:38 AM
    • Replies: 9
    • Views: 2,221
    11-30-2014, 04:33 PM Go to last post
  9. statistics help for fourth year biopharmaceutical science student

    Hi I am just looking for advice on how to source some websites or books that may be of help to me with my statistics module. I currently have an...

    Started by ciaran‎, 11-30-2014 04:01 PM
    • Replies: 0
    • Views: 1,275
    11-30-2014, 04:01 PM Go to last post
  10. linear or exponencial?

    Hi all, I would like to find out, if there is any quantitative method for evaluation, if relationship between two variables is rather linear or...

    Started by tomasuher‎, 11-30-2014 08:56 AM
    • Replies: 1
    • Views: 1,107
    11-30-2014, 10:34 AM Go to last post
  11. Multiple Regression Multiple Choice Questions - Is this correct?


    Started by SigmundFreud‎, 11-29-2014 09:23 PM
    exam question, linear regression, multiple regression, practice problem
    • Replies: 3
    • Views: 2,139
    11-30-2014, 10:18 AM Go to last post
  12. Question Intervals for a grouped relative frequency distribution

    What are the intervals of a grouped relative frequency distribution of a Z distribution? The range of the Z distribution is minus infinity to plus...

    Started by DrAnthonyRodriguez‎, 11-30-2014 09:22 AM
    z distribution
    • Replies: 0
    • Views: 1,288
    11-30-2014, 09:22 AM Go to last post
  13. Pearson coefficient and dispersion

    How do i know how much dispersion can i explain with Pearson coefficient? Thank you for the answers.

    Started by wishmaster‎, 11-20-2014 03:48 AM
    • Replies: 2
    • Views: 1,665
    11-30-2014, 03:45 AM Go to last post
  14. Question What design does my study have?

    Say for example I wanted to do a study comparing cats (the control group) and dogs, measuring the extent to which they exhibit 4 behavioural...

    Started by gwsurrey‎, 11-28-2014 05:02 PM
    between-subjects, design, mixed design, mixed designs, within-subjects
    • Replies: 2
    • Views: 1,278
    11-30-2014, 03:33 AM Go to last post
  15. Homework help - double-checking understanding

    I've been going through some basic stats multi-choice past papers and there are a couple of questions I'm not 100% about. Would be grateful is...

    Started by jfw13‎, 11-29-2014 03:23 PM
    • Replies: 0
    • Views: 1,190
    11-29-2014, 03:23 PM Go to last post
  16. How to determine if sample represents population

    I hope this isn't a strange or a foolish question. I am wondering if there is anyway to demonstrate that a sample set represents the population when...

    Started by discopig‎, 11-28-2014 05:44 PM
    • Replies: 5
    • Views: 2,529
    11-29-2014, 06:55 AM Go to last post
  17. Probability question

    Can someone help me with this question? A segment size is 18% of the sample. 88% of the segment will buy laptop in the next 6months, 7% of the...

    Started by Blueblue‎, 11-28-2014 07:21 AM
    • Replies: 1
    • Views: 1,204
    11-28-2014, 08:15 PM Go to last post
  18. Time series correlation versus average error

    Hi there, I have two time series of pollution. I've computed the average error between the two device to be 7 ppb and the correlation...

    Started by bradyj2‎, 11-28-2014 11:51 AM
    • Replies: 0
    • Views: 734
    11-28-2014, 11:51 AM Go to last post
  19. which test(s) do I use?

    Hi, This is not a homework question, it's to do with research. I have two groups of sequences of reals. As a pretend tiny example: group 1...

    Started by Waylah‎, 11-28-2014 02:15 AM
    • Replies: 0
    • Views: 1,339
    11-28-2014, 02:15 AM Go to last post
  20. Net Promoter Score - Calculating Confidence Intervals and Margin of Error

    Hello, In my sample of 1162, I have 291 Promoters, 476 Neutral and 395 Detractors. I therefore have an NPS of -9. We have calculated a...

    Started by stanlee‎, 11-17-2014 05:33 AM
    confidence interval, margin of error, net promoter score, nps
    • Replies: 3
    • Views: 2,284
    11-27-2014, 10:24 PM Go to last post
  21. Re: Selecting appropriate Stat Test and measurement

    Problem Statement: Unclear as to which is the most suitable test to apply to the following data. (Also, is what is being outlined and proposed even...

    Started by Mr.Magoo‎, 11-26-2014 10:28 PM
    • Replies: 2
    • Views: 1,589
    11-27-2014, 10:23 PM Go to last post
  22. Definition of z-score...

    I need help with this question: Define the standardized value or z-score corresponding to a given observation y in a normal distribution. Explain...

    Started by veganraw‎, 11-27-2014 06:27 PM
    • Replies: 4
    • Views: 2,284
    11-27-2014, 10:15 PM Go to last post
  23. Analyzing a Line Chart

    I have a line chart with number of people on the y axis and weeks on the x axis. I was wondering if someone knew how to analyze or determine the...

    Started by cg21‎, 11-27-2014 06:29 PM
    • Replies: 2
    • Views: 1,281
    11-27-2014, 10:01 PM Go to last post
  24. ANOVA - basic assumptions

    I'm trying to answer a question about the assumptions of ANOVA - my understanding (and checked on here:...

    Started by jfw13‎, 11-27-2014 12:23 PM
    • Replies: 1
    • Views: 1,106
    11-27-2014, 04:17 PM Go to last post
  25. LInear discriminant analysis

    I have been reading up on LDA and I found the following on Wikipedia Homogeneity of variance/covariance (homoscedasticity): Variances among...

    Started by ame2005‎, 11-26-2014 11:08 PM
    • Replies: 0
    • Views: 1,361
    11-26-2014, 11:08 PM Go to last post
  26. Binary Logisitic regression to predict treatment type using time (year)?

    Hello! I have some small data to work with, to look at whether one health centre has shifted from using treatment A to treatment B over time...

    Started by Bcteagirl‎, 11-26-2014 08:08 PM
    no suggestion
    • Replies: 2
    • Views: 1,518
    11-26-2014, 10:40 PM Go to last post
  27. Signal detetion analysis d prime

    Can anyone answer this please, I have no idea how to work out d' or response bias: In an experiment on the effect of alcohol consumption on...

    Started by ConfusedStatistician‎, 11-26-2014 04:52 AM
    d prime, d-prime, signal detection, signal detection analysis
    • Replies: 2
    • Views: 1,830
    11-26-2014, 06:51 PM Go to last post
  28. Post what is the difference between formative models vs reflective models ?

    Hello Can someone explain to me with easy example to make me understand the difference between formative and reflective models ?

    Started by hanialbarni‎, 11-26-2014 11:57 AM
    • Replies: 1
    • Views: 3,624
    11-26-2014, 02:55 PM Go to last post
  29. Standard Error of mean question

    Hi, can i have help with this question? Thanks alot. Answer is A. but i have no idea how to do.

    Started by kev.chong.2014‎, 11-26-2014 11:58 AM
    • Replies: 5
    • Views: 3,401
    11-26-2014, 02:04 PM Go to last post
  30. Talking Linear regression help?

    How can I check if there is linear regression between the descent rate of flights at 1000 feet and 900 feet and so forth?? Should I look into...

    Started by tarekshah‎, 11-25-2014 06:36 PM
    • Replies: 2
    • Views: 1,854
    11-26-2014, 11:41 AM Go to last post
  31. Goodness-of-fits tests.

    I honestly have no idea where to even start in this assignments. Any type of ell would be greatly appreciated. I can easily do the problems given in...

    Started by annc‎, 11-25-2014 11:08 PM
    goodness of fit, goodness-of-fit, hypothesis, level of significance
    • Replies: 1
    • Views: 1,700
    11-26-2014, 12:21 AM Go to last post
  32. Can the game show Deal or No Deal be treated the same way as The Monty Hall Problem?

    Hi guys, I'm quite new to this forum so I'm sure I put this question in the wrong section but oh well. Today in Physics, we got off topic and were...

    Started by Dangshnizzle‎, 11-25-2014 08:39 PM
    • Replies: 3
    • Views: 2,181
    11-25-2014, 09:28 PM Go to last post
  33. Interpreting regression analysis low R-square AND low p value

    Wanted to check my understanding of interpreting the results of a regression analysis with a large sample - a very low R-square (0.003) and low...

    Started by sheffdave2002‎, 11-25-2014 11:04 AM
    • Replies: 3
    • Views: 2,447
    11-25-2014, 12:37 PM Go to last post
  34. Unhappy Measuring Team Performance. From a non-Statistician

    Sorry. Some naive questions which might not make sense to statisticians but if anyone can give me some guidance on this. It's a situation I've...

    Started by RichB‎, 11-24-2014 12:56 PM
    • Replies: 3
    • Views: 2,098
    11-25-2014, 11:29 AM Go to last post
  35. Sign test, P-Values, Sign Ranked test.

    Don't know how to delete post!

    Started by ShannonReg‎, 11-25-2014 11:22 AM
    sign test p value stats
    • Replies: 0
    • Views: 1,166
    11-25-2014, 11:22 AM Go to last post
  36. Measurement error bias questions?

    Please delete question mods.

    Started by samwatkins‎, 11-20-2014 09:39 PM
    • Replies: 1
    • Views: 1,856
    11-25-2014, 01:06 AM Go to last post
  37. How to test significance?

    A reviewer on my (qualitative!) paper has suggested using some small-N statistical tests for my findings. I am a stats-idiot and would love a bit of...

    Started by Elli‎, 11-24-2014 11:00 AM
    • Replies: 5
    • Views: 1,639
    11-24-2014, 05:15 PM Go to last post
  38. Which analysis to choose

    Hello 14 years after my graduation I study again in a masters program in which statistics is also a part. Now, doing some Progress I have a homework...

    Started by roger20‎, 11-24-2014 07:40 AM
    • Replies: 3
    • Views: 1,340
    11-24-2014, 04:06 PM Go to last post
  39. Confidence Interval for Sample and T-Test

    For the sake of illustration, I am using a caliper mounted in stand A and measuring a part 20 times. This gives me a mean of 2mm and a 99% CI of...

    Started by Eppen‎, 11-19-2014 05:16 PM
    • Replies: 7
    • Views: 1,823
    11-24-2014, 02:57 PM Go to last post
  40. Need hep with Bayesian statistics

    Hi, I am a biologist and currently I am doing my Masters. This semester I do statistics. Bayesian statistics is one of the topics that troubles me...

    Started by jdimopoulos‎, 11-24-2014 03:47 AM
    • Replies: 0
    • Views: 1,115
    11-24-2014, 03:47 AM Go to last post
  41. Question How do you tease out how many people a study result applies to (x out of 100)?

    I'm doing a large meta analysis of systemic causes to skin disease, and I'm trying to present people the following aggregates: Average effect...

    Started by turantelle‎, 11-24-2014 02:32 AM
    • Replies: 0
    • Views: 1,556
    11-24-2014, 02:32 AM Go to last post
  42. Question about two-way anova with interaction effect

    Hi! I just read this from a textbook on the topic of two-way anova: "If interaction effect between factor A and factor B is significant, we cannot...

    Started by freezingswallow‎, 11-23-2014 12:53 PM
    two-way anova
    • Replies: 4
    • Views: 2,508
    11-23-2014, 10:26 PM Go to last post
  43. Normally distributed mean values and the student's t-test.

    Hi, These are potentially stupid questions, but bear with me I am not a statistician nor a mathematician. If a group of observations is...

    Started by Soul‎, 11-22-2014 04:15 PM
    • Replies: 2
    • Views: 1,515
    11-23-2014, 03:18 PM Go to last post
  44. Logistic regression cutoff at 0.3

    Hi, I have built a logistic regression model with misclassification rate around 18%. When I look at the ROC curve(area under the curve is 0.76)...

    Started by ame2005‎, 11-22-2014 03:56 PM
    event, logistic, probability cutoff
    • Replies: 3
    • Views: 1,373
    11-23-2014, 07:12 AM Go to last post
  45. Inventory management from Donald Waters pg 75 .

    I want to know how did he calculate the holding cost for EOQ model. Ques.:- Sarah Brown works for a manufacturer that makes parts for marine...

    Started by atuleshjha‎, 11-23-2014 05:21 AM
    holding cost, homework, hoolding, inventory, order, quantity
    • Replies: 0
    • Views: 1,112
    11-23-2014, 05:21 AM Go to last post
  46. Credit Risk Transition Marix

    Hi guys This is more of a finance/credit risk question but I wasn't sure where else I could ask this. Hopefully some of you may have heard the...

    Started by excelmac‎, 11-23-2014 12:05 AM
    • Replies: 0
    • Views: 2,016
    11-23-2014, 12:05 AM Go to last post
  47. [Please help] Checking independence for normal variable by checking the covariance

    Hi everyone, I got a big problem with proving the lemma of checking independence for normal variable sample by merely checking the covariance, anyone...

    Started by bobbymistery‎, 11-22-2014 09:43 PM
    • Replies: 0
    • Views: 1,341
    11-22-2014, 09:43 PM Go to last post
  48. Feedback on Graph Desired

    I have generated a graph (using R) to plot Frey Readability (LINK) for text (I'm applying this formula to spoken dialogue). This graph is part of a...

    Started by trinker‎, 12-30-2011 12:27 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,353
    11-22-2014, 11:31 AM Go to last post
  49. Question Poisson Distribution - Time Interval

    I think I worded this wrongly in my previous post...so I am posting again. I have a system that on AVERAGE it receives orders in a poisson...

    Started by tallman85‎, 11-22-2014 04:48 AM
    • Replies: 1
    • Views: 2,158
    11-22-2014, 09:46 AM Go to last post
  50. possion dist.

    Hello to all. I have a system that receives orders in a possion distribution with a mean of 2 per day. If I want to increase the orders by 12 per...

    Started by tallman85‎, 11-21-2014 04:14 PM
    • Replies: 5
    • Views: 1,839
    11-22-2014, 09:03 AM Go to last post
  51. Interesting question involving gaussians

    You are given two Gaussian variables: X_1 and X_2 with means m_1, m_2 and variance v_1, v_2. Suppose you know the sum X_1 + X_2 is equal to n....

    Started by ibozic‎, 11-21-2014 04:27 PM
    • Replies: 1
    • Views: 1,606
    11-21-2014, 05:14 PM Go to last post
  52. Please help me with finding the right probability distribution

    I have three variables that I need to find the right probability distribution for 1) Aircraft Vertical Speed ( Descent rate) 2) Vertical Speed...

    Started by tarekshah‎, 11-21-2014 10:22 AM
    • Replies: 1
    • Views: 1,295
    11-21-2014, 11:06 AM Go to last post
  53. Which t-test (complication)?

    Hi there, Im new here but any help would be greatly appreciated :) I have 48 lettuces which were judged by their weights (grown in separate pots)....

    Started by marcusfish‎, 11-18-2014 05:28 PM
    two way anova
    • Replies: 7
    • Views: 1,990
    11-20-2014, 11:32 AM Go to last post
  54. Question Reaching a 95% Confidence level within an estimated population.

    I have a population of 367 products of which I have a sample of 50. Products can have a damaged package or can be damaged itself. We know for a fact...

    Started by maq‎, 11-20-2014 02:50 AM
    confidence intervals, hypergeometric
    • Replies: 0
    • Views: 1,364
    11-20-2014, 02:50 AM Go to last post
  55. understanding U-statistics calculation in directional statistics

    I'm trying to work with U-statistics as described in Mardia and Jupp's 2000 book Directional Statistics (2). Specifically pages 220-2 there is a...

    Started by mdhunstiger‎, 11-20-2014 02:01 AM
    • Replies: 0
    • Views: 1,122
    11-20-2014, 02:01 AM Go to last post
  56. Need an idiot's guide on how to present findings from differing sample size, please.

    I need to present my findings of survey ratings of 4 products that are based on differing numbers of people asked. Ie Product A 14...

    Started by Kingbroady‎, 11-19-2014 11:27 AM
    • Replies: 1
    • Views: 1,701
    11-19-2014, 08:01 PM Go to last post
  57. How do I account for non-responders bias in a survey?

    We survey leads after three months to determine the final outcome (became a sale, lost to a competing brand, lost to a competing technology, still...

    Started by cohom‎, 11-19-2014 09:25 AM
    • Replies: 2
    • Views: 1,189
    11-19-2014, 05:02 PM Go to last post
  58. What's the difference between model prediction and model validation?

    Hello! I learned from a statistics course that there are two different regions regarding building regression models: one is for the purpose of...

    Started by freezingswallow‎, 11-19-2014 12:40 PM
    • Replies: 1
    • Views: 1,140
    11-19-2014, 04:58 PM Go to last post
  59. Over my head

    I think I may be over my head just by being here, but I need help figuring out a real world problem. I have 49 different categories I want to...

    Started by dharughty‎, 11-19-2014 12:07 AM
    • Replies: 3
    • Views: 1,392
    11-19-2014, 04:19 PM Go to last post
  60. Red face A question about whether dropping interaction terms as a whole or not

    Hello! I'm taking a regression course this semester and I have a question regarding when to drop the interaction terms. Suppose we have a...

    Started by freezingswallow‎, 11-19-2014 11:32 AM
    dummy variable, interaction, regression
    • Replies: 3
    • Views: 1,063
    11-19-2014, 04:14 PM Go to last post

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