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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,823
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,899
    07-16-2014, 11:01 AM Go to last post
  1. Measure of representativeness

    Suppose I have State | Sample | Population s1 | n1 | N1 s2 | n2 | N2 .. | .. | .. Is the correlation between (n1 n2 ..) and (N1 N2 ..) a...

    Started by diodoo‎, 01-31-2007 06:25 AM
    • Replies: 0
    • Views: 3,475
    01-31-2007, 06:25 AM Go to last post
  2. Principal Components Analysis

    Can somebody confirm whether the variables used in a Principal Components Analysis, such as on SPSS, ALL need to be interval level? I have 2...

    Started by Laura‎, 01-18-2007 01:13 PM
    • Replies: 1
    • Views: 4,537
    01-31-2007, 10:24 AM Go to last post
  3. Question calculating means and standard deviation from confidence interval

    Is there anyway to calculate mean and standard deviation if we are given the 95% confidence interval? I have the following interval 1.339-13.833 I...

    Started by Katherine‎, 01-30-2007 04:47 PM
    • Replies: 2
    • Views: 56,920
    01-31-2007, 05:53 PM Go to last post
  4. Contingency Tables

    I am doing AS Level Statistics, i just finished S1 and started doing S2 however, my teacher is not that experienced at teaching A level, so...

    Started by aadd‎, 02-01-2007 03:12 PM
    • Replies: 1
    • Views: 5,931
    02-01-2007, 11:04 PM Go to last post
  5. Standard deviation for a binomial distribution

    There are N boxes which can be empty or filled with balls. The probability of filling each box with a ball is p. According to binomial...

    Started by pierre.fasciola‎, 02-02-2007 09:39 PM
    • Replies: 0
    • Views: 1,771
    02-02-2007, 09:39 PM Go to last post
  6. Estimating Proportions

    Does anyone know any good sites fro explaining estimating proportions? I am clueless as to how to do this. My notes are not helping me. Is there a...

    Started by cannoli‎, 01-25-2007 12:05 PM
    • Replies: 2
    • Views: 2,436
    02-02-2007, 09:51 PM Go to last post
  7. not sure what to do! multiple DVs

    Hi there I have a data set which includes 6 continuous DVs (job satisfaction, 3 different kinds of commitment and work-life conflict) and 1...

    Started by thornc‎, 02-03-2007 06:54 PM
    • Replies: 0
    • Views: 1,571
    02-03-2007, 06:54 PM Go to last post
  8. Uncertainty analysis

    Hello everybody, I'm not sure whether this is the right place to ask, but I will try my luck here. This question concerns uncertainty...

    Started by ricky‎, 02-04-2007 04:33 AM
    • Replies: 0
    • Views: 2,324
    02-04-2007, 04:33 AM Go to last post
  9. Red face non-parametric

    Help please I need to provide a non parametric test with two independant samples the wilcoxon is the wrong test and there is not enough data for...

    Started by kala1408‎, 02-03-2007 09:07 AM
    • Replies: 2
    • Views: 2,659
    02-04-2007, 07:37 AM Go to last post
  10. Sample variance s^2?

    Can anyone give me a definitive description of s^2, sigma^2 and sxx for regression? I know that we can obtain an estimate of the true population...

    Started by Statstastic‎, 02-04-2007 09:07 AM
    • Replies: 1
    • Views: 3,928
    02-05-2007, 12:30 AM Go to last post
  11. standard error of ratio of coefficients

    hi all, I am interested in the ratio of two regression coefficients. Is it possible to obtain a standard error for such a ratio? eg: I...

    Started by dragonflyFZX‎, 02-01-2007 08:07 AM
    • Replies: 2
    • Views: 11,034
    02-05-2007, 12:48 AM Go to last post
  12. variance in regression

    Hi, Can someone help me fugure this out regarding simple linear regression. Firstly B is beta and A is alpha We are told that y = A + Bx + e...

    Started by PeterVincent‎, 02-05-2007 12:50 PM
    • Replies: 0
    • Views: 4,988
    02-05-2007, 12:50 PM Go to last post
  13. homework help

    I have to conduct a mann whitney test but i have a small amount of data, it keeps telling not enough data. Help please kala:shakehead

    Started by kala1408‎, 02-05-2007 03:15 PM
    • Replies: 0
    • Views: 2,862
    02-05-2007, 03:15 PM Go to last post
  14. Smile Difficult statistical problem; PLEASE HELP

    Hi! For my master thesis I need to do a lot of statistics: I have done behavioural and acoustic research on a group of 8 captive dolphins. A...

    Started by Maaike‎, 02-06-2007 05:54 AM
    • Replies: 0
    • Views: 1,711
    02-06-2007, 05:54 AM Go to last post
  15. Smile Difficult statistical problem; PLEASE HELP

    Hi! For my master thesis I need to do a lot of statistics: I have done behavioural and acoustic research on a group of 8 captive dolphins. A...

    Started by Maaike‎, 02-06-2007 05:56 AM
    • Replies: 0
    • Views: 2,128
    02-06-2007, 05:56 AM Go to last post
  16. Question Homework HELP

    Did I do this right?:confused: The percentage of American men who say they would marry the same woman if they had to do it all over again is 80%....

    Started by karen33marie‎, 02-05-2007 02:49 PM
    • Replies: 1
    • Views: 4,253
    02-06-2007, 07:38 AM Go to last post
  17. Not sure how to analyse this Rank-Order Data

    Good Day to All, I am not sure where to begin in analyzing some data I have. DATA: Sample population N=100 Looking at factors that helped or...

    Started by MsfStl‎, 01-30-2007 12:03 PM
    • Replies: 1
    • Views: 5,518
    02-06-2007, 03:43 PM Go to last post
  18. Error bars - ratio of averages

    Hi I was just wondering if anyone could help me. I have 4 values for growth rates of a yeast with no treatment, and 4 values of the growth rate...

    Started by Sara_UK‎, 02-07-2007 09:34 AM
    • Replies: 0
    • Views: 5,172
    02-07-2007, 09:34 AM Go to last post
  19. Comparing temperature measurements between sensors?

    Hi, I want to statistically compare 3 different temperature sensors (3 different manufactures) to determine which sensor gives the best...

    Started by karvin‎, 02-07-2007 11:00 AM
    • Replies: 0
    • Views: 2,467
    02-07-2007, 11:00 AM Go to last post
  20. Question Trouble figuring out descriptives in data

    Hi everyone I have a major stats exam next week for a job interview. I am struggling on a concept with descriptives stats which is probably very...

    Started by babygirl110‎, 02-07-2007 11:14 AM
    • Replies: 0
    • Views: 2,019
    02-07-2007, 11:14 AM Go to last post
  21. sample size help. - for ph.d.non.stats person wanting to learn!lol

    i want to run a bunch of anovas to compare means between two groups. There are approximately 135 items, composing 5 scales. I'm wondering how to...

    Started by please ask‎, 02-06-2007 11:23 PM
    • Replies: 1
    • Views: 4,004
    02-07-2007, 02:29 PM Go to last post
  22. Statistics for small sample sizes

    I'm wondering if anyone can help. I have experimental data for a number of groups, but the sample size within each group is only around 5. I am...

    Started by DannyLoveday‎, 02-05-2007 09:25 AM
    • Replies: 1
    • Views: 2,774
    02-07-2007, 02:35 PM Go to last post
  23. Question Power Analysis for MANOVA and ANOVAS - Please help, going mental!

    Dear All I am going nuts trying to work this out.... I'm a Psych. grad student trying to check to see what sample size I would need in the...

    Started by clairealexia‎, 02-05-2007 05:00 AM
    • Replies: 1
    • Views: 12,037
    02-07-2007, 04:57 PM Go to last post
  24. Red face hypothesis testing PLEASE HELP

    I don't really know how to tell what test to use with this questio. I think that it is ttest or z. could you please help. I have done so much reading...

    Started by Kathaleenm‎, 02-07-2007 09:52 AM
    • Replies: 2
    • Views: 5,282
    02-07-2007, 05:33 PM Go to last post
  25. intermediate stats help (ANOVA/source table)

    Hello, So I have spent the better part of 2 hours looking at this problem, notes, websites and my textbook attempting to figure out how to do...

    Started by Mallory‎, 02-05-2007 07:20 PM
    • Replies: 1
    • Views: 3,869
    02-07-2007, 06:33 PM Go to last post
  26. Parametric or non-parametic tests?

    I know that you use a nonparametric test if the skewness statistic is twice the standard error statistic but in this case do you ignore the sign?For...

    Started by ps0u4168‎, 02-07-2007 06:35 AM
    • Replies: 1
    • Views: 3,577
    02-07-2007, 06:36 PM Go to last post
  27. Binomial Distributions

    Hello there, Finally got the hang of the this from by using my Excel. Although, I would love to do it on my Ti86 and by the formula method. ...

    Started by rkslperez‎, 02-02-2007 03:35 PM
    • Replies: 1
    • Views: 2,763
    02-07-2007, 11:39 PM Go to last post
  28. Analyzing daily data by month and day of week

    Hi :) So I've got this data - the number of parking tickets issued, per day, in a certain locale over one year. Overall, then, n=365. I am...

    Started by retrofit81‎, 04-16-2007 12:39 AM
    • Replies: 0
    • Views: 2,854
    04-16-2007, 12:39 AM Go to last post
  29. Question System test scripts - need a statistical model

    My company develops and runs system test scripts, containing multiple steps each, on various ERP systems like Oracle. I have been asked to develop a...

    Started by vangogh228‎, 04-16-2007 07:08 AM
    • Replies: 0
    • Views: 2,491
    04-16-2007, 07:08 AM Go to last post
  30. Unhappy Comparing two percentages for significance

    Hello...this was posted but was lost recently. I am trying to figure out the best method to compare two percentages for significance. I am...

    Started by breiteyes55‎, 04-15-2007 11:06 PM
    • Replies: 1
    • Views: 34,180
    04-16-2007, 09:48 AM Go to last post
  31. Probability question

    Each bottle must contain 300ml. Mean: 298ml Std Dev: 3ml What is the probability that a 35 bottle sample will have 295ml? This has been...

    Started by irenemichelle‎, 02-02-2007 11:36 PM
    • Replies: 2
    • Views: 3,818
    04-16-2007, 10:04 AM Go to last post
  32. Help with Panel data estimation

    I have a Question regarding panel data linear regression, should I lag my independent variables in the estimation equation like one normally does in...

    Started by waelmoussa‎, 04-16-2007 11:18 AM
    • Replies: 0
    • Views: 2,405
    04-16-2007, 11:18 AM Go to last post
  33. Simple Post-hoc Sample Size Analysis-for two means

    Hi, I have a simple problem. I've run some preliminary tests (t-tests) comparing two samples. I was unable to detect any significant difference...

    Started by Sphaero‎, 04-16-2007 11:37 AM
    • Replies: 0
    • Views: 2,412
    04-16-2007, 11:37 AM Go to last post
  34. Help with a normal distribution problem

    I'm studying for a test later today and I've run across a problem that I have no idea how to do. The info I have is Mu = $6,000 sigma = $1200. ...

    Started by Xanius‎, 04-16-2007 10:56 AM
    • Replies: 3
    • Views: 3,314
    04-17-2007, 07:36 AM Go to last post
  35. trying to find a means of proving my statement

    Hi all, I recently claimed that having promotions at baseball games would result in increased attendance. Unfortunately, my stats professor...

    Started by racermike1967‎, 04-16-2007 09:04 PM
    • Replies: 2
    • Views: 2,240
    04-17-2007, 09:51 AM Go to last post
  36. EM-Likelihood

    Could someone please explain Expectation-Maximization in terms of missing data imputation in practical (rather then theoretical) terms? I'm having a...

    Started by ceperras‎, 04-17-2007 11:02 AM
    • Replies: 0
    • Views: 2,624
    04-17-2007, 11:02 AM Go to last post
  37. forecasting--how to?

    How would I go about setting up a good forecasting model? I have been asked to forecast the number of calls a call center receives. I have been...

    Started by statgirl26‎, 04-17-2007 04:57 PM
    • Replies: 0
    • Views: 1,864
    04-17-2007, 04:57 PM Go to last post
  38. Average

    Hi, I have some diary data (Day1, Day2, Day3, Day4, Day5). If I am trying to calculate Average-Days and, for example, Day3 is missing...do I...

    Started by ceperras‎, 04-16-2007 11:25 AM
    • Replies: 4
    • Views: 2,527
    04-18-2007, 07:38 AM Go to last post
  39. non normal distribution and regression

    Hi, If the distribution of y variable is not normal. (skewness equal to 1.1 and kurtosis to 8.2) can i run a simple linear regression of the y on...

    Started by 12345678‎, 04-18-2007 10:14 AM
    • Replies: 1
    • Views: 8,570
    04-18-2007, 11:20 AM Go to last post
  40. Statistics Question

    I'm a programmer/database developer building financial reports for various product lines. I can break down revenue data by various categorical...

    Started by kameron‎, 04-18-2007 04:20 PM
    • Replies: 0
    • Views: 1,826
    04-18-2007, 04:20 PM Go to last post
  41. Factor reduction of dichotomous variables

    I have a set of 22 dichotomous (yes/no) variables with a sample size of almost 1000 that I want to factor reduce. I do not think I can use factor...

    Started by deedee‎, 04-18-2007 04:59 PM
    • Replies: 0
    • Views: 2,451
    04-18-2007, 04:59 PM Go to last post
  42. Non-normal distribution?

    According to central limit theorem, measurement noise distribution can be well described by normal distribution. But under what conditions does noise...

    Started by kazec‎, 04-18-2007 09:28 PM
    • Replies: 0
    • Views: 2,240
    04-18-2007, 09:28 PM Go to last post
  43. Is it significantly different from chance?

    Can someone give me a second opinion on this, or suggest some alternative test I might want to use? I've run an experiment with 5 trials. Each...

    Started by ephialtes‎, 04-19-2007 11:12 AM
    • Replies: 0
    • Views: 3,584
    04-19-2007, 11:12 AM Go to last post
  44. Exclamation Change from Baseline

    Good Morning, Let's say I am looking at number of sneezes over a course of a month and I want to calculate the Percent Change from Baseline in...

    Started by ceperras‎, 04-19-2007 08:51 AM
    • Replies: 1
    • Views: 4,795
    04-19-2007, 11:27 AM Go to last post
  45. Question hypothesis testing

    A bottling company needs to produce bottles that will hold 12 ounces of liquid for a local brewery. Periodically, the company gets complaints that...

    Started by kfrizz‎, 04-18-2007 05:19 PM
    • Replies: 1
    • Views: 5,790
    04-19-2007, 11:29 AM Go to last post
  46. Ranking Performance

    In statistics if 10 people take a test you get your mark along with your ranking relative to the rest of the class, I think this is done as...

    Started by clemkonan‎, 04-18-2007 04:44 PM
    • Replies: 1
    • Views: 2,684
    04-19-2007, 11:40 AM Go to last post
  47. Bonferroni Correction

    Hey, im doing a 2 way within subjects ANOVA and want to do post hoc tests, but SPSS obviously doesnt do post hoc tests for within subjects...

    Started by e.stevens23‎, 04-20-2007 06:38 AM
    • Replies: 0
    • Views: 5,195
    04-20-2007, 06:38 AM Go to last post
  48. Post Calculating p-value

    Is there a way to calculate t-test p value from average,sem and number of samples compared.

    Started by arraf‎, 04-18-2007 03:08 PM
    • Replies: 5
    • Views: 13,069
    04-21-2007, 01:44 AM Go to last post
  49. Free Data Sites for Class

    Am taking MVA class. I'm looking for a Free Data Set that has responses to a questionnaire on a likert scale, preferably 1-7, with at least 100...

    Started by Melissa‎, 04-22-2007 11:10 PM
    • Replies: 0
    • Views: 2,582
    04-22-2007, 11:10 PM Go to last post
  50. Urgent help on simple problem!!

    I don't know why, but I can't seem to get any suggestion on a solution to my simple problem when I search the web or look in my statistics books I...

    Started by Petter‎, 04-20-2007 08:09 AM
    • Replies: 2
    • Views: 2,829
    04-23-2007, 01:11 PM Go to last post
  51. Post Almost done with assignment but . . .

    Need some help on the final steps. Multipart assignment and I am down to last three steps but am on last two. Parts are 7. Calculate...

    Started by vonbaxter‎, 04-19-2007 04:32 PM
    • Replies: 1
    • Views: 2,623
    04-23-2007, 01:17 PM Go to last post
  52. Ancova

    hei, i am comparing body-measyrments of two groups of fish that are fed different diets against each other. the problem is that the two diets...

    Started by mia‎, 04-20-2007 05:53 AM
    • Replies: 2
    • Views: 3,337
    04-24-2007, 05:23 AM Go to last post
  53. Missing Values

    Hi everybody, I have a problem with analyzing data due to many missing values. Experiment: Subjects have to press a button in response to a...

    Started by marble‎, 04-24-2007 07:55 AM
    • Replies: 0
    • Views: 2,952
    04-24-2007, 07:55 AM Go to last post
  54. Question Linear model for 6 factors

    I am trying to construct a linear model for a design with the following A location, a = 4 levels, Random B forest, B = 2 levels, Fixed...

    Started by E.T.‎, 04-24-2007 10:48 AM
    • Replies: 0
    • Views: 1,959
    04-24-2007, 10:48 AM Go to last post
  55. Relationship between Probability of failure and satndard deviation

    Hi, I have run into the following problem. I am running a test on a sample size of N. The test only detects if the samples pass or fail. If X...

    Started by ashishjain79‎, 04-24-2007 07:01 PM
    • Replies: 0
    • Views: 3,309
    04-24-2007, 07:01 PM Go to last post
  56. 3 variables, level of significance...help!

    I'm having trouble with this problem. It's different from anything I've come across so far and I'm not sure how to begin. Here it is: John, Ken,...

    Started by Mancolt‎, 04-23-2007 10:39 PM
    • Replies: 1
    • Views: 2,435
    04-24-2007, 10:40 PM Go to last post
  57. Trouble with the concept

    I think I've narrowed this down, but I'm not sure yet: You're hired to conduct a study to find out which of two brands of diet cola college...

    Started by gman86‎, 04-24-2007 01:34 AM
    • Replies: 1
    • Views: 3,193
    04-24-2007, 10:45 PM Go to last post
  58. Exclamation Easy Question...need help

    We need an estimate of the mean acreage of Canadian farms. We plan to measure acreage for a random sample of 100 farms. Results from an earlier study...

    Started by bootknocker‎, 04-24-2007 07:09 PM
    • Replies: 1
    • Views: 5,072
    04-24-2007, 11:01 PM Go to last post
  59. 3SLS method

    Dear members: I am reading a report on an econometric analysis that has been carried out for fish industry. I am not familiar with 3SLS. I...

    Started by mimilafleur‎, 04-25-2007 09:54 AM
    • Replies: 0
    • Views: 2,671
    04-25-2007, 09:54 AM Go to last post
  60. how to test for Gaussian distribution

    Hey, I'm a bit rusty on my stats and i'm coming back to an article i wrote 18 months ago. I think i tested for Gaussian distribution, but now i...

    Started by Claire Mc‎, 04-25-2007 03:37 PM
    • Replies: 0
    • Views: 3,111
    04-25-2007, 03:37 PM Go to last post

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