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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: 197,244
    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: 67,011
    09-30-2005, 09:44 AM Go to last post
  1. Comparing correlations

    I've asked caregivers to complete three scales relating to the same group of persons with an intellectual disability. I'll call the scales A, B, and...

    Started by JoeMiller88‎, 09-02-2009 10:14 PM
    • Replies: 2
    • Views: 10,562
    06-01-2010, 07:13 AM Go to last post
  2. open output

    is there a way i could open my spss tables with word?or excel? I dont have the software at home and I need the tables to do my assignment.

    Started by Boa‎, 05-31-2010 05:38 PM
    • Replies: 2
    • Views: 2,844
    05-31-2010, 08:33 PM Go to last post
  3. one-way ANOVA or am I completely wrong?

    -------------------------------------------------------------------------------- I wondered if you could help me please. I am prediciting that...

    Started by whitelilly‎, 05-28-2010 08:59 AM
    • Replies: 1
    • Views: 2,084
    05-31-2010, 07:44 PM Go to last post
  4. Equivalent for T-test?

    Hey, I tried to post a question here earlier, but maybe it was explained poorly. I`ll try again. The basic thing is: Before i do the...

    Started by GetItDone‎, 05-31-2010 04:44 AM
    • Replies: 1
    • Views: 2,544
    05-31-2010, 10:29 AM Go to last post
  5. Nominal vars, Ward's method and K-means

    Hello, First of all: nice forum and lovely to see fellow statisticans and experts here. I have some general questions concerning cluster...

    Started by Felisha‎, 05-31-2010 10:22 AM
    • Replies: 0
    • Views: 3,337
    05-31-2010, 10:22 AM Go to last post
  6. Question Ordinal Logistic regression for Time data?

    Hello everyone! I have just finished running an experiment looking at factors (hungry/not hungry, Illuminated/darkened, plus the interaction of...

    Started by Tardigrade‎, 05-28-2010 10:42 PM
    • Replies: 4
    • Views: 2,953
    05-31-2010, 08:00 AM Go to last post
  7. Need Help on this Hypothesis Testing ASAP pls!

    A large hat manufacturer, MALLORY HATS, is concerned that the mean weight of their signature Kentucky Derby hat is not greater than 2.5 pounds. It...

    Started by chinexcodo‎, 05-30-2010 11:06 PM
    • Replies: 1
    • Views: 2,371
    05-31-2010, 07:29 AM Go to last post
  8. Help with Kendall Tau-b

    HI Can acnyone please guide me? How I can perform a Z Fisher transformation (which is usually used with Pearson or Spearman)- or a simialr...

    Started by Naomi Ferziger‎, 05-31-2010 04:54 AM
    • Replies: 0
    • Views: 3,211
    05-31-2010, 04:54 AM Go to last post
  9. Lightbulb Hotel statistics!! Anyone think they can help??

    How many hotels are in the US? How many hotel rooms are in the US? How many are in the world? What is the average occupancy rate for hotels in the...

    Started by morganstats‎, 05-31-2010 12:50 AM
    • Replies: 0
    • Views: 2,105
    05-31-2010, 12:50 AM Go to last post
  10. Time taken to run linear regression

    Hi, I'm Marty and not a statistician but came here for an advice from people with a knowledge of stats. I am running a small research consultancy...

    Started by marty‎, 05-31-2010 12:27 AM
    • Replies: 0
    • Views: 1,604
    05-31-2010, 12:27 AM Go to last post
  11. Hypothesis Testing

    I'm having difficulty getting around this question. Could someone please review it and help me with it? Thank you! Question Reads: The director...

    Started by chinexcodo‎, 05-30-2010 10:23 PM
    • Replies: 0
    • Views: 1,671
    05-30-2010, 10:23 PM Go to last post
  12. alpha and p-value hypothesis testing?

    What does it mean when alpha > p-value? I know that when alpha> p-value, you reject the null, and that when alpha < p-value you do not reject the...

    Started by augustusachilles‎, 05-30-2010 01:14 PM
    • Replies: 1
    • Views: 4,291
    05-30-2010, 09:16 PM Go to last post
  13. Some conceptual questions

    Hey guys, so I have a few stats questions that are pretty broad and I was hoping you might be able to point out some of the major areas to focus on...

    Started by Slipery‎, 05-30-2010 05:13 PM
    • Replies: 0
    • Views: 2,377
    05-30-2010, 05:13 PM Go to last post
  14. Normal Distribution help

    Hi, I have the following problem given: Marks of a class follow a normal distribution. 22% of students got distinction marks (85 and above) and...

    Started by Ayyappa‎, 05-30-2010 08:26 AM
    • Replies: 1
    • Views: 1,982
    05-30-2010, 08:34 AM Go to last post
  15. Working out RSS in matrix regression

    Hey everyone Okay, I'm having a few problems. I'm fine with single variable matrix regression, using the formula \displaystyle RSS = \mathbf{e'e}...

    Started by .ACS.‎, 05-30-2010 04:57 AM
    • Replies: 0
    • Views: 2,789
    05-30-2010, 04:57 AM Go to last post
  16. Quantile-Normal Plot?

    Hi folks, I've been looking for a detailed explanation of what the quantile-normal plot is, what it means, and how one is made (in general, not...

    Started by Wornways‎, 05-28-2010 04:15 PM
    • Replies: 2
    • Views: 4,485
    05-30-2010, 04:11 AM Go to last post
  17. Help with statistics homework?

    1). If the hypothesis test is conducted using α = .025, this means that: a. there is a 2.5% chance that the null hypothesis is true b. there is a...

    Started by madden‎, 05-29-2010 06:46 PM
    • Replies: 1
    • Views: 8,361
    05-30-2010, 02:43 AM Go to last post
  18. testing for trends

    Hi guys suppose we have variable x when we regress x on the linear time dummy variable t, the correlation coefficient is statistically significant...

    Started by childofprodigy‎, 05-29-2010 09:38 PM
    • Replies: 1
    • Views: 2,855
    05-29-2010, 09:53 PM Go to last post
  19. P

    what does P (capital p) stands for?? I know that p value is the probability but P ???

    Started by Boa‎, 05-28-2010 12:05 PM
    • Replies: 3
    • Views: 2,528
    05-29-2010, 08:33 PM Go to last post
  20. Geometric progression

    Hello all, I just have a quick verification question. Suppose we have two variables x and y between zero and one. I want to take the sum from...

    Started by Salohcin‎, 05-29-2010 11:42 AM
    • Replies: 1
    • Views: 3,181
    05-29-2010, 12:17 PM Go to last post
  21. Why n-1 in variance

    I don't understand why n-1 is used as the denominator to calculate sample variance. Could anyone explain with simple language and a very simple...

    Started by thapagaurab‎, 05-28-2010 09:16 PM
    • Replies: 1
    • Views: 2,796
    05-28-2010, 09:58 PM Go to last post
  22. Hypothesis Test

    If the null hypothesis is true, then distribution of test statistic, T is continuous with cdf F. The test rejects for large values of T. Let V denote...

    Started by SmileAli‎, 05-27-2010 06:02 PM
    • Replies: 2
    • Views: 2,065
    05-28-2010, 06:16 PM Go to last post
  23. Control variable

    Hello, I`m currently doing an analysis in a marketing-study, and i`m wondering how to use my data for a control variable in my model. I use SPSS....

    Started by GetItDone‎, 05-28-2010 09:56 AM
    • Replies: 0
    • Views: 2,977
    05-28-2010, 09:56 AM Go to last post
  24. Asymmetric Multivariate Regression?

    Hi all, For asymmetric non-linear multi-variate cases what are some known methods to look at? I'm partial to WEKA and R and MatLab but am...

    Started by Axl‎, 05-27-2010 11:53 PM
    • Replies: 0
    • Views: 3,482
    05-27-2010, 11:53 PM Go to last post
  25. Differences between Stratified and Cluster random sample

    What is the differences between Stratified and Cluster random sample

    Started by jc5211‎, 05-27-2010 07:16 PM
    • Replies: 0
    • Views: 2,864
    05-27-2010, 07:16 PM Go to last post
  26. Random sampling

    Random samples sampling in 1-PropZTest I'm doing a test on skittles and I took randomly took 10 small bags of skittles for my sample. What...

    Started by jc5211‎, 05-27-2010 06:47 PM
    • Replies: 0
    • Views: 2,447
    05-27-2010, 06:47 PM Go to last post
  27. Question Random samples in 1-PropZTest

    I'm doing a test on skittles and I took randomly took 10 small bags of skittles for my sample. What happens if I took just 1 big bag of skittles...

    Started by jc5211‎, 05-27-2010 05:53 PM
    • Replies: 0
    • Views: 2,426
    05-27-2010, 05:53 PM Go to last post
  28. spss interpretation

    Hi!! I have one quick question concerning spss interpration of the tables. In the output, I have a table with partial eta squared / adjusted r...

    Started by Boa‎, 05-27-2010 11:21 AM
    • Replies: 1
    • Views: 3,286
    05-27-2010, 04:02 PM Go to last post
  29. equation of the correlation and R^2

    i have this results from a regression test i made that means that the equation is grade = 52.075 + books*5.738 right? also i want to...

    Started by jak22‎, 05-27-2010 01:04 PM
    • Replies: 1
    • Views: 2,204
    05-27-2010, 03:27 PM Go to last post
  30. Correlation Coefficient Equation

    Lets assume my correlation is 1. Sx and Sy then become 1 How do I solve the following equation for xi ? R = summation((xi-xbar)*(yi-ybar))...

    Started by rwd5013‎, 05-27-2010 12:12 PM
    • Replies: 3
    • Views: 3,031
    05-27-2010, 02:47 PM Go to last post
  31. statistics project, percent insured and mortality

    hi guys, boy am i glad i found this forum I was a stats major in college and I got a new job, its an administrative assistant job for a doctor....

    Started by brmkane‎, 05-16-2010 01:10 PM
    • Replies: 3
    • Views: 2,386
    05-27-2010, 02:26 PM Go to last post
  32. Alpha size and power?

    In statistical hypothesis testing, does a bigger size alpha mean a more powerful test? Is an alpha level of .05 more powerful than an alpha level...

    Started by augustusachilles‎, 05-26-2010 08:14 PM
    • Replies: 1
    • Views: 6,348
    05-27-2010, 11:16 AM Go to last post
  33. Sample size for a pilot study

    I am looking for advice on what size a sample should be for a pilot study. The purpose of the pilot is to test a questionnaire. The population it...

    Started by grandmal‎, 05-27-2010 03:09 AM
    • Replies: 2
    • Views: 8,026
    05-27-2010, 11:14 AM Go to last post
  34. Difference between a covariate and fixed factor

    Hi, in a linear mixed model, what is the difference between a covariate and a fixed factor ? The best explanation I've been able to find is: A...

    Started by thrillhouse86‎, 05-26-2010 09:10 AM
    • Replies: 3
    • Views: 22,745
    05-27-2010, 10:39 AM Go to last post
  35. When comparing mean of 3 samples withn a group of 42

    I've a gigantic file and have many different analysis and performance statistics of a group of 42 operating units. I want to compare the mean of 3...

    Started by Perchek‎, 05-27-2010 09:20 AM
    • Replies: 0
    • Views: 1,931
    05-27-2010, 09:20 AM Go to last post
  36. Loss of precision when data is grouped?

    Hey everone.. I just had a quick stats question from an assignment for a class.. For the last assignment in our explanation we didn't do all that...

    Started by Slipery‎, 05-27-2010 06:30 AM
    • Replies: 1
    • Views: 2,836
    05-27-2010, 08:07 AM Go to last post
  37. classification

    Hi, I have the following problem: I have averaged the mean of pauses duration (which is a speech feature) across 4 picture that my participants...

    Started by aledanda‎, 05-26-2010 09:52 AM
    • Replies: 2
    • Views: 2,459
    05-27-2010, 04:15 AM Go to last post
  38. independent samples t test help

    i have 3 variables male female total and i have the number of deaths per month in each variable i want to make an independent samples t test...

    Started by jak22‎, 05-25-2010 11:16 AM
    • Replies: 14
    • Views: 6,252
    05-27-2010, 02:47 AM Go to last post
  39. t-scores

    any psycology types know what a t-score is and how/when to use it. thanks

    Started by fed1‎, 05-26-2010 09:18 PM
    • Replies: 1
    • Views: 2,482
    05-26-2010, 10:13 PM Go to last post
  40. Roc

    Have a question in mind: Assuming I have a study to test the responsiveness of mice to a drug and the marker I have to try to predict...

    Started by corneliuslionel‎, 05-26-2010 09:55 PM
    • Replies: 0
    • Views: 2,185
    05-26-2010, 09:55 PM Go to last post
  41. Three Way ANOVA

    Hello there, I am currently a PhD student in HCI. As part of the data analysis, I want to examine the effects of four independent variables (all...

    Started by rahuls‎, 05-26-2010 04:34 AM
    • Replies: 3
    • Views: 3,035
    05-26-2010, 04:29 PM Go to last post
  42. Simultaneous Equations Models

    Hi everyone, i have been sitting infront of my desk for hours trying to figure this out. The question is: Estimate the reduced form equations by...

    Started by kom01‎, 05-26-2010 12:13 PM
    • Replies: 0
    • Views: 2,133
    05-26-2010, 12:13 PM Go to last post
  43. statistic data for regression

    Hi guys, does anyone know any data online, not the samples in SPSS in order to practice my skills in regression? Actually I would like to use some of...

    Started by jak22‎, 05-26-2010 12:08 PM
    • Replies: 0
    • Views: 2,966
    05-26-2010, 12:08 PM Go to last post
  44. Making conclusions based on samples of samples.

    If you take a sample of 1000, and then you determine a segment of the sample, can you really make any conclusions about the segment? For example:...

    Started by j_smith89‎, 05-26-2010 11:13 AM
    • Replies: 0
    • Views: 2,281
    05-26-2010, 11:13 AM Go to last post
  45. Joint distributions

    Mark on the (u1, u2) plane the region where fU1,U2(u1, u2) > 0. On this region, mark the subregion where s = u1 + u2 satisfies s < t for arbitrary t...

    Started by Cookie‎, 05-26-2010 06:32 AM
    • Replies: 1
    • Views: 2,375
    05-26-2010, 08:51 AM Go to last post
  46. Which test to use for this question?

    Hi guys, Just doing my stats assignment, and really dont know which test to use for the following question - I know its a correlation of sort...

    Started by StarStar‎, 05-25-2010 04:41 AM
    • Replies: 3
    • Views: 2,461
    05-26-2010, 01:21 AM Go to last post
  47. Formula for the p-value in probability theory notation?

    Give a formula for the p-value in probability theory notation for a one-sided test, where H1: μ > μΗ0. Is this right? pr(T ≥ t)

    Started by augustusachilles‎, 05-25-2010 09:24 PM
    • Replies: 0
    • Views: 4,034
    05-25-2010, 09:24 PM Go to last post
  48. effect size

    Hi everyone, how do you calculate cohen<s d with these values? Npairs=50 r=0.6 t=3.5 The answer is d=0.44 but i dont know how to get there?? I...

    Started by Boa‎, 05-25-2010 03:08 PM
    • Replies: 2
    • Views: 3,894
    05-25-2010, 04:56 PM Go to last post
  49. Estimating future revenue

    My boss has asked me to provide a best estimate for future revenue based on a number of *potential* contracts which are worth varying amounts of...

    Started by DevonTaig‎, 05-25-2010 12:57 PM
    • Replies: 1
    • Views: 3,276
    05-25-2010, 01:31 PM Go to last post
  50. curse of dimension problem

    Hi all, I have a question about the curse of dimension problem. I read that the principle component analysis is unstable when the number of...

    Started by brakepad‎, 05-24-2010 11:12 PM
    • Replies: 4
    • Views: 2,559
    05-25-2010, 09:46 AM Go to last post
  51. Fisher's exact

    Hi, just found this forum :wave: Have a quick (and probably silly) question about Fisher's exact test - is this purely for a 2x2 table, or can it...

    Started by archaeojo‎, 05-25-2010 09:09 AM
    • Replies: 0
    • Views: 3,306
    05-25-2010, 09:09 AM Go to last post
  52. Number of Respondents Higher

    I had a survey conducted, in which I was expecting a 20% response. However, the responses from some places has been more positive than expected ad...

    Started by sabina‎, 05-25-2010 08:45 AM
    • Replies: 0
    • Views: 1,848
    05-25-2010, 08:45 AM Go to last post
  53. Unhappy Moment??

    Hi there, I am reading the part called Moment, Moment Generating funtions and product moments none of these are quite undestandable to me with any...

    Started by techamitdv‎, 05-25-2010 06:35 AM
    • Replies: 0
    • Views: 2,374
    05-25-2010, 06:35 AM Go to last post
  54. Simple percentage question.

    Hi guys, I know this is a pretty simplistic question for you guys but I really need you're help. I am completing this particularly hard university...

    Started by jake_110118‎, 05-25-2010 01:06 AM
    • Replies: 0
    • Views: 2,047
    05-25-2010, 01:06 AM Go to last post
  55. CI question

    Hello i have the following question in a homework assignemnt: In one hospital undertaking heart transplants, 34 of 265 patients transplanted...

    Started by Reels‎, 05-24-2010 09:04 PM
    • Replies: 1
    • Views: 1,861
    05-25-2010, 12:17 AM Go to last post
  56. What test is best!

    Hopefully this is a quick question for all you statistic gurus! If I am using the same survey to measure the same respondents to a 10 session...

    Started by apdragon‎, 05-24-2010 11:59 AM
    • Replies: 1
    • Views: 2,045
    05-24-2010, 09:12 PM Go to last post
  57. infinite lag distribution proof

    asdddddddddddddddddddddddddd

    Started by anths88‎, 05-24-2010 08:31 AM
    • Replies: 1
    • Views: 3,824
    05-24-2010, 11:57 AM Go to last post
  58. Independent PDF

    Let U1 and U2 be independent observations from a uniform distribution with PDF fu(U) = 1 0<u<1 The question is to write the joint PDF,...

    Started by Cookie‎, 05-24-2010 08:21 AM
    • Replies: 1
    • Views: 3,016
    05-24-2010, 08:59 AM Go to last post
  59. What type of testing to do on the statistic I have?

    Not quite sure on the reasoning of which tests to use. Would like some help. For one of the questions, out of 50 games Frank has played 60% of the...

    Started by GrapeJuice‎, 05-24-2010 01:41 AM
    • Replies: 1
    • Views: 2,813
    05-24-2010, 01:48 AM Go to last post
  60. conducting a two-sided test at the α= 0.05 level of significance

    Hey guys i assume this is probably a really basic question, but its giving me trouble. I have only recently taken up stat study and have a limited...

    Started by Reels‎, 05-24-2010 12:11 AM
    • Replies: 5
    • Views: 97,201
    05-24-2010, 01:17 AM Go to last post

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