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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: 66,982
    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: 197,205
    07-16-2014, 11:01 AM Go to last post
  1. Simple effects analyses not so simple!

    Need some help as to what way should the simple effects of an age_category (young, old) x condirtion (A, B, C, D, E) interaction be analysied for the...

    Started by statie‎, 10-04-2006 07:11 AM
    • Replies: 3
    • Views: 4,546
    10-04-2006, 10:00 AM Go to last post
  2. Help finding IRR

    I have a problem that I am doing for a basic Engineering statistics class that goes like this: You take out a loan to pay the remaining 15,000 on...

    Started by sirrion13‎, 10-04-2006 03:25 AM
    • Replies: 1
    • Views: 4,380
    10-04-2006, 10:05 AM Go to last post
  3. item to total correlation?

    I want to purify a scale, so I want to test for three things: Doing a principal components EFA I assess: a. Internal consistency. I will use...

    Started by deram‎, 10-04-2006 10:33 PM
    • Replies: 0
    • Views: 5,247
    10-04-2006, 10:33 PM Go to last post
  4. Euclidean Distance as measure of homogeneity for K-means Cluster analysis

    Hi, Currently I'm performing K-means cluster analysis. To figure out how homogeneous the respondents within my clusters are, I calculate the...

    Started by Pieterg‎, 10-05-2006 10:32 AM
    • Replies: 0
    • Views: 4,592
    10-05-2006, 10:32 AM Go to last post
  5. Red face what is the purpose in plotting moving average??

    please help.

    Started by ionc‎, 10-05-2006 04:33 PM
    • Replies: 1
    • Views: 8,059
    10-05-2006, 05:25 PM Go to last post
  6. Comparing Median and Median Absolute Deviation (MAD)

    Hi, I have 3 focus groups each consisting of 4 people. They all rated a list of quality indicators (ratings were between 1 to 9, 1 being less...

    Started by sushmaja‎, 10-05-2006 03:07 PM
    • Replies: 1
    • Views: 8,221
    10-05-2006, 05:32 PM Go to last post
  7. Post Sampling Distributions....

    I am sorry....but I have no idea how to go about setting this problem up.... Heights of male students. To estimate the mean height of u...

    Started by reretriple2‎, 10-05-2006 03:30 PM
    • Replies: 1
    • Views: 5,064
    10-05-2006, 05:34 PM Go to last post
  8. Post More On Sampling Distributions.....

    Okay so I started on this one too....but once again I don't know if my method is correct.... Suppose that the distribution of all male students on...

    Started by reretriple2‎, 10-05-2006 06:06 PM
    • Replies: 1
    • Views: 3,871
    10-05-2006, 06:51 PM Go to last post
  9. Question Please Help...Normal Distribution Probabilities

    HOw do you solve a problem like this one. Let X~N(3,4) P ...it should be greater than or equal to. Thanks.

    Started by karaeileen‎, 10-03-2006 08:21 PM
    • Replies: 2
    • Views: 2,389
    10-06-2006, 01:44 AM Go to last post
  10. Logistic Regression

    I am a distance learning student with a project on hand. I am new to stats and would be seeking help from colleagues. Thanks I am confused about two...

    Started by dave‎, 10-06-2006 06:52 AM
    • Replies: 0
    • Views: 2,692
    10-06-2006, 06:52 AM Go to last post
  11. Needing some assistance with this problem (true proportion)

    Here's the problem: A U.S. Travel Data Center's survey of 1500 adults found taht 42% of respondents stated that they favor historical sites as...

    Started by adegrasse‎, 10-06-2006 08:07 PM
    • Replies: 1
    • Views: 5,904
    10-07-2006, 08:41 AM Go to last post
  12. ANOVA Advice

    Hi I am trying to do some tests and I need some advice. I am comparing scores on two different questionnaires given to around 1000 people. The issue...

    Started by rlynas‎, 10-05-2006 10:07 PM
    • Replies: 1
    • Views: 2,370
    10-07-2006, 08:45 AM Go to last post
  13. Which Statistics To Use?

    I am looking at the effects of 4 different driving training methods on 4 different groups of people. My dependent variables are thier number of...

    Started by lstanley‎, 10-06-2006 06:44 PM
    • Replies: 3
    • Views: 2,203
    10-07-2006, 12:46 PM Go to last post
  14. T-Test Question

    Hi Everyone, I'm 98% done with my statistics homework, and I'm just stuck on one issue. To make a long story short, I was asked to do...

    Started by MdmeBtrfly‎, 10-07-2006 02:45 PM
    • Replies: 1
    • Views: 2,442
    10-07-2006, 04:00 PM Go to last post
  15. Exponential Distribution problem

    I am having trouble undestanding this question: The daily failure rate of an electrical component follows an exponential distribution with...

    Started by Mare74‎, 10-07-2006 04:44 PM
    • Replies: 0
    • Views: 2,107
    10-07-2006, 04:44 PM Go to last post
  16. Unhappy Logistic Regression - Odds Ratio's

    Hi, I am attempting to interpret the SPSS output used in direct logistic regression. In the Parameter Estimates table the Exp(B) output's are: .473;...

    Started by Mark‎, 10-08-2006 07:20 AM
    • Replies: 1
    • Views: 2,959
    10-08-2006, 04:34 PM Go to last post
  17. Help Please!!!!

    Probability distribution for RV X is given by f(x) = { 1/5 for 2 < x < 7; 0 elsewhere find P(3 < X < 5) as a fraction. also, Show that f(x)...

    Started by Leper Messiah‎, 10-08-2006 09:35 PM
    • Replies: 0
    • Views: 1,552
    10-08-2006, 09:35 PM Go to last post
  18. Question Linear Correlation Coefficient

    The text book that I am using does not explain step by step how they used the linear correlation coefficient equation to get the answer. When I...

    Started by blondie23‎, 10-08-2006 06:34 PM
    • Replies: 1
    • Views: 2,238
    10-08-2006, 09:37 PM Go to last post
  19. Question Standard Error Question

    Greetings! I'm working on a stats assignment and I'm stumped. I've searched several websites and looked through both my current and former stats...

    Started by Stacey‎, 10-09-2006 12:05 AM
    • Replies: 0
    • Views: 1,970
    10-09-2006, 12:05 AM Go to last post
  20. clarification logistic regression

    Dear friends, I put this up some days back, but it seems to have missed attention. Could somebody help me out. Thanks. I am a distance learning...

    Started by dave‎, 10-09-2006 10:40 AM
    • Replies: 0
    • Views: 2,467
    10-09-2006, 10:40 AM Go to last post
  21. Help Please

    I have to produce stats for my manager on number of help desk calls fixed each month but the monthly average is inaccurate when compared to a whole...

    Started by simonw‎, 10-09-2006 05:49 AM
    • Replies: 1
    • Views: 2,363
    10-09-2006, 03:56 PM Go to last post
  22. Repeated Measure on Categorical Data

    A group of subjects was tested and re-tested with the same set of measures over a 3-months interval. A total of three sets of scores were collected,...

    Started by Beyon‎, 10-09-2006 03:45 AM
    • Replies: 1
    • Views: 4,118
    10-09-2006, 08:39 PM Go to last post
  23. ANOVA help

    Hi All, I have to compute an ANOVA table by hand, and I've only been given total scores for each group, sample size for each group, and...

    Started by MdmeBtrfly‎, 10-09-2006 03:33 PM
    • Replies: 1
    • Views: 2,615
    10-09-2006, 08:52 PM Go to last post
  24. Wink Unbalanced Data Designs

    I have four sampling groups with the following sample sizes for each N=201,120,10,40 Question (1) I need to run an ANOVA to determine each groups...

    Started by lstanley‎, 10-08-2006 09:37 PM
    • Replies: 1
    • Views: 4,496
    10-09-2006, 09:08 PM Go to last post
  25. Badly need assistancr L Regression

    Dear JohnM, It looks everything is falling on you. I badly need assistance on this issue which I am putting up for the third time. Please help out....

    Started by dave‎, 10-10-2006 10:25 AM
    • Replies: 0
    • Views: 1,778
    10-10-2006, 10:25 AM Go to last post
  26. Which tests should I use - please help

    Hello. First-time poster here. I've been having trouble trying to figure out how to analyze some data, and I would really appreciate some help. ...

    Started by aroussin‎, 10-11-2006 01:53 PM
    • Replies: 0
    • Views: 1,923
    10-11-2006, 01:53 PM Go to last post
  27. Samping distribution question

    Hello, I am doing work on sampling distributions however I do not understand these questions or what I am supposed to do, if someone could clear it...

    Started by Quantum Bit‎, 10-12-2006 10:07 AM
    • Replies: 0
    • Views: 2,398
    10-12-2006, 10:07 AM Go to last post
  28. How to interpret Tukey's b

    I was wondering if anyone could assist me on how to interpret my Tukey's b results. I need to indicate which clusters differ significantly from...

    Started by Pieterg‎, 10-12-2006 11:10 AM
    • Replies: 0
    • Views: 7,309
    10-12-2006, 11:10 AM Go to last post
  29. Probability help

    I'm trying to set up a probability analysis to determine if a recall is necessary. We found one of our 13 machines started to break down fairly...

    Started by allskewedup‎, 10-13-2006 11:53 AM
    • Replies: 0
    • Views: 1,839
    10-13-2006, 11:53 AM Go to last post
  30. Chi-squared test

    Hi, I think I'm right in thinking I should use a chi-squared contingency table test here because the data is nominal, but it seems to over-simplify...

    Started by gem‎, 10-13-2006 10:16 AM
    • Replies: 3
    • Views: 2,955
    10-15-2006, 01:01 AM Go to last post
  31. how to interpret the sign of a t-value

    Hi, If you did a t-test against the null hypothesis involving the beta coefficients from a multilinear regression, how would you interpet the sign...

    Started by nymphnode‎, 10-15-2006 08:28 AM
    • Replies: 0
    • Views: 5,642
    10-15-2006, 08:28 AM Go to last post
  32. Determining a covariance matrix

    :confused: Let Sigma be an m x m matirx given by sigma = theta^2 *..... | 1 p p ......p | | p 1 p...

    Started by utsahalfpint‎, 10-15-2006 12:20 PM
    • Replies: 0
    • Views: 2,629
    10-15-2006, 12:20 PM Go to last post
  33. Determining modality

    Hello, I have a large number of spectra with gaussian-distributed noise superimposed on to it. There are large parts of the spectra where we know...

    Started by brummiejim‎, 10-16-2006 11:13 AM
    • Replies: 0
    • Views: 2,873
    10-16-2006, 11:13 AM Go to last post
  34. I need help with stats

    I have couple of questions that I don't know how to answer. how the standard error of the mean is calculated. Is the standard error of the mean...

    Started by Jessie‎, 10-13-2006 01:06 PM
    • Replies: 1
    • Views: 3,865
    10-16-2006, 11:33 AM Go to last post
  35. Question Question about Significance in a binary system

    I do not have an extensive stistics background, but do have a better than average mathematical background. My question is regarding a binary system...

    Started by lid73‎, 10-12-2006 04:41 PM
    • Replies: 1
    • Views: 2,271
    10-16-2006, 02:39 PM Go to last post
  36. I need help!

    Hi everyone, Here is my situation: I have never in my life taken a statistics course. I have an exam for a position with the state of CA on 10/18....

    Started by Andrew‎, 10-16-2006 03:53 PM
    • Replies: 0
    • Views: 1,866
    10-16-2006, 03:53 PM Go to last post
  37. Expected Value and Standard Dev.

    I need some guidance with the following...please help!! Scenario: You pay $10 and roll a die. If you get a 6, you win $50. If not, you get to...

    Started by HuskerJay‎, 10-16-2006 06:15 PM
    • Replies: 0
    • Views: 7,272
    10-16-2006, 06:15 PM Go to last post
  38. Confidence level 99%

    Hi, I just getting confused by these two questions below. In the survey described in the previous exercise, there were 1050 borrowers whose...

    Started by jena2007‎, 10-10-2006 12:13 AM
    • Replies: 1
    • Views: 4,297
    10-16-2006, 09:40 PM Go to last post
  39. mean/variance

    Scores on an examination are normally distributed with mean 75 and variance 22. a. What is the probability that a student scores 70 or higher?...

    Started by teacher2be‎, 10-16-2006 07:51 PM
    • Replies: 2
    • Views: 2,025
    10-17-2006, 07:44 AM Go to last post
  40. Cool Help!!

    Hi everyone, any ideas on how to prove the following? I am nearly there but can't get it right, any help would be greatly appreciated. Many thanks ...

    Started by gem_150‎, 10-17-2006 08:57 AM
    • Replies: 0
    • Views: 1,428
    10-17-2006, 08:57 AM Go to last post
  41. please help me I'm not sure what I"m supposed to do here?

    Okay here is the questions Refer to table 3 in the article and focus on the row " Perceptions of parent efficacy". Explain the meaning of each...

    Started by dana82‎, 10-17-2006 04:56 PM
    • Replies: 0
    • Views: 1,642
    10-17-2006, 04:56 PM Go to last post
  42. Do I have to Normalise & Standardise?

    Hi Everyone :wave: new here (and new to stats so bear with me!) Here is my task (in brief). I have 600,000 call records, each with an age and...

    Started by Maz‎, 10-10-2006 10:18 AM
    • Replies: 1
    • Views: 2,632
    10-18-2006, 06:17 AM Go to last post
  43. Explaining Statistical conclusions--confidence intervals

    I am having a problem explaining what exactly the confidence interval gives me.....for example, If you say that "I am 95% confident that the...

    Started by reretriple2‎, 10-17-2006 10:23 PM
    • Replies: 1
    • Views: 2,742
    10-18-2006, 06:18 AM Go to last post
  44. Which test: binary dependent, ordinal independent

    Dear Colleagues, Which test do I use when I have a binary dependent variable (Join a company or not join) and an ordinal independent variable...

    Started by dave‎, 10-19-2006 04:41 AM
    • Replies: 0
    • Views: 3,536
    10-19-2006, 04:41 AM Go to last post
  45. Exclamation Joint Probability Function HELP!!!

    Let the joint density function of X and Ybe given by: f(x)={kxy^2 for 0<x<y<1 {0 otherwise what is the value of k? Can...

    Started by snthorne‎, 10-18-2006 07:20 PM
    • Replies: 1
    • Views: 2,712
    10-19-2006, 11:54 AM Go to last post
  46. How to start - analyzing - Plizzzzz Help really needed

    :confused: :confused: Hi. I'm lost in statistics: Is a two factorial design. I have two treatments and a control. :confused: One factor is...

    Started by pink‎, 10-19-2006 05:08 PM
    • Replies: 0
    • Views: 1,644
    10-19-2006, 05:08 PM Go to last post
  47. Question Beginner needs help

    Question on my first assignment in statistics: The adjacent data summarize daily absences for an assembly plant. The HR director wonders if absence...

    Started by mbrother11‎, 10-13-2006 10:59 PM
    • Replies: 4
    • Views: 3,289
    10-19-2006, 11:06 PM Go to last post
  48. mean or median for presenting statistics

    I am currently writing a paper and I am in a dilemma about which statistics to use when I present the descriptive data. Some of the data is normally...

    Started by Drkmfh‎, 10-18-2006 06:21 AM
    • Replies: 3
    • Views: 2,509
    10-20-2006, 07:43 AM Go to last post
  49. density function

    I am struggling with density functions. Can you help with this? Let Y have the density function given by .4, ...

    Started by teacher2be‎, 10-16-2006 05:41 PM
    • Replies: 1
    • Views: 7,222
    10-20-2006, 07:50 AM Go to last post
  50. How do I explain this to other students?

    This is a problem that a student I am tutoring brought to me and I am not sure how to solve it or explain it to him, can you give me any suggestions?...

    Started by teacher2be‎, 10-17-2006 07:48 AM
    • Replies: 1
    • Views: 2,768
    10-21-2006, 10:49 AM Go to last post
  51. Exclamation Have I chosen the right analysis?

    I am analysing changes that happened in a merger. It is an archival study utilizing survey data. I have a set of 9 survey items (5 pt scale) that I...

    Started by CFairbank‎, 10-21-2006 12:25 PM
    • Replies: 0
    • Views: 1,677
    10-21-2006, 12:25 PM Go to last post
  52. How do I get either conditional or joint probabilities if I'm given the prior...

    How do I get either the conditional and joint probabilities if I'm given the prior and posterior probabilities. I'm doing a decision analysis that...

    Started by Emawk‎, 10-20-2006 04:34 AM
    • Replies: 2
    • Views: 2,371
    10-21-2006, 01:24 PM Go to last post
  53. Red face Reporting Means

    If n=149 and you have one case each for a few of the outcomes with an exceptional result, do the single cases get discussed in "results" for a...

    Started by kalbright36‎, 10-22-2006 01:53 AM
    • Replies: 0
    • Views: 2,104
    10-22-2006, 01:53 AM Go to last post
  54. Nominal data - how thick am I?!!!

    Help needed!!! I'm currently completing my dissertation on sustainable procurement - looking at the buying practices of staff and suppliers to my...

    Started by Ali‎, 10-23-2006 10:59 AM
    • Replies: 0
    • Views: 2,650
    10-23-2006, 10:59 AM Go to last post
  55. Question Greenhouse-Geisser and effect size

    Hi, The data I am currently looking at is from a 2-way repeated measures ANOVA. My question is what do you recommend for a measure of effect size...

    Started by srf99‎, 10-23-2006 01:49 PM
    • Replies: 0
    • Views: 4,062
    10-23-2006, 01:49 PM Go to last post
  56. Log transform

    Hi, When should I transform my data into log? Thanks!

    Started by Sphaero‎, 10-21-2006 11:10 AM
    • Replies: 2
    • Views: 4,274
    10-23-2006, 04:46 PM Go to last post
  57. E(X)===> Help with Expectation problem

    Assume the length X in minutes of a particular type of telephone conversation is random variable with probability density function f(x)={1/5...

    Started by snthorne‎, 10-20-2006 12:36 PM
    • Replies: 2
    • Views: 5,109
    10-23-2006, 04:57 PM Go to last post
  58. Unhappy Lost in stats!

    The amount of time one spends in a bank is exponentially distributed with mean 10 minutes. a.) What is the probability that a customer...

    Started by teacher2be‎, 10-23-2006 05:53 PM
    • Replies: 0
    • Views: 1,728
    10-23-2006, 05:53 PM Go to last post
  59. Mean

    The lifetimes of interactive computer chips produced by a certain manufacturer are normally distrubuted with aprameters u = 1.4 x 10^6 hours and ro =...

    Started by teacher2be‎, 10-23-2006 06:05 PM
    • Replies: 1
    • Views: 2,818
    10-23-2006, 07:00 PM Go to last post
  60. How to prove an exponential function?

    hi! My problem is that i have a large sequence of inter-arrival times and i want to know how can i prove that they are indeed exponential? i draw...

    Started by oxinosch‎, 10-23-2006 09:09 AM
    • Replies: 2
    • Views: 4,842
    10-23-2006, 07:05 PM Go to last post

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