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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: 196,608
    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: 66,642
    09-30-2005, 09:44 AM Go to last post
  1. Deck of cards and probability (non replacement)

    Hi can someone help me Im stuck. When selecting cards from a deck without replacement: What is the probability that the first card is a four and...

    Started by keithb‎, 03-07-2009 02:21 PM
    • Replies: 8
    • Views: 9,763
    11-11-2010, 09:40 PM Go to last post
  2. simple stat question...

    Hi, I am taking signal readings and they are varying, so I take 5 replicate measurements, and have something like this: sample1.avg (of 5...

    Started by UN01‎, 05-22-2009 11:10 AM
    • Replies: 8
    • Views: 3,043
    08-25-2011, 07:11 PM Go to last post
  3. Similar to a Pearson Chi-Square Test

    Hi All, I'm working with a 4x3 Contingency Table and would like to do a test similar to a Chi-Square Test. I figured it might be called a Weight...

    Started by cjrisi88‎, 08-17-2010 02:00 PM
    • Replies: 8
    • Views: 3,705
    08-18-2010, 09:56 AM Go to last post
  4. "Combined" Means and Variances?

    Hi everyone. This is my first stat assignment of the semester and I am already confused. I'm not sure what my prof is asking. I will reproduce...

    Started by stud40111‎, 09-11-2010 12:13 PM
    • Replies: 8
    • Views: 7,219
    09-13-2010, 08:07 PM Go to last post
  5. Simple statistics help

    I'm taking operations management and my stat professor never really taught us anything...so i'm kind of up a creek without a paddle. question...

    Started by tanktwo‎, 09-14-2010 10:27 AM
    • Replies: 8
    • Views: 3,481
    09-14-2010, 11:12 AM Go to last post
  6. Central tendency and percentile

    Can any of the following be true with a data set consisting of 1,000 values that are all different? If so, can you please explain why:eek: The...

    Started by jenclark242‎, 09-23-2010 08:49 AM
    • Replies: 8
    • Views: 7,350
    09-24-2010, 08:04 AM Go to last post
  7. Statistic Theory Question

    At the age of 8, Max obtained an observed score of 48 on a standard test of vocabulary. After a year of therapy directed at enhancing his vocabulary...

    Started by maple_email‎, 10-14-2010 06:28 PM
    • Replies: 8
    • Views: 3,390
    10-20-2010, 02:06 AM Go to last post
  8. Unhappy Help with calculating significance of the results

    Hello, I am doing down-stream analysis of genomic data. I have 'X' number of occurrences in our 2000 gene sequences of interest. I have generated...

    Started by anagari‎, 10-21-2010 12:59 PM
    • Replies: 8
    • Views: 3,288
    10-22-2010, 10:32 AM Go to last post
  9. P value/T distribution chart question

    Thank you for taking the time to read my query. I appreciate it. For my class, we have to find the p values by hand. We look them up in the z, t...

    Started by ealeql‎, 11-01-2010 09:37 AM
    • Replies: 8
    • Views: 16,755
    11-02-2010, 05:35 PM Go to last post
  10. help.

    ok, so i need help with this question, i have done it 4 times now and cannot get the correct answer... a recent study sugguests that declinging...

    Started by losing_my_mind‎, 11-04-2010 04:33 PM
    • Replies: 8
    • Views: 2,845
    11-05-2010, 01:16 PM Go to last post
  11. P Value Question

    N=12-1 with a degree of freedom of 11 t = 6.01-6 divided by 0.18 divided by the square root of 12. = 0.192 P-Value = P(t<-0.192)+P(t>0.192) ...

    Started by bladed‎, 11-22-2010 08:13 PM
    • Replies: 8
    • Views: 3,297
    11-22-2010, 08:51 PM Go to last post
  12. Question what tests should I use?

    I have completed most of my assignment, but SPSS is eating my brain and I keep mixing everything up. Can anyone help with what tests I should use for...

    Started by loathesome‎, 11-30-2010 01:36 PM
    • Replies: 8
    • Views: 4,032
    12-03-2010, 01:08 AM Go to last post
  13. Need help ASAP 20 mins!

    Sorry for the quick need of help, but can you guys help me solve this problem? I have tried for over 2 hours and still can't find the answer, and I...

    Started by kirbster123‎, 11-30-2010 11:32 PM
    • Replies: 8
    • Views: 5,271
    12-01-2010, 01:35 AM Go to last post
  14. Skewed!

    Hi, I had a question, umm..in fact two :P lets say we have a skewed to right or left population and we dont know population sigma, also n is small...

    Started by SadieKhan‎, 12-02-2010 03:38 PM
    • Replies: 8
    • Views: 3,104
    12-03-2010, 02:50 PM Go to last post
  15. log normal plot shows non-normal

    Hi, I have two data sets both have 20 observations for mean high temperatures . I have to compare 1950-1969 to 1970 -1989, but the problem is log...

    Started by SadieKhan‎, 12-11-2010 08:28 AM
    • Replies: 8
    • Views: 5,630
    12-12-2010, 01:44 PM Go to last post
  16. 2x14 Chi Square Homogeneity Test Tool Needed

    Hello, I need to run a Chi-squre homogeneity test for a 2x14 contingency table. The most rxc matrix tool I can find is a 10x10 at: ...

    Started by August 15‎, 12-07-2010 10:07 AM
    • Replies: 8
    • Views: 6,532
    12-09-2010, 09:11 AM Go to last post
  17. I guess this is like a puzzle...

    I'm not certain this qualifies as statistics, per sa, but it's at least in the same vein. I have need of writing a computer program that analyzes...

    Started by darkenedforest‎, 12-28-2010 03:51 AM
    • Replies: 8
    • Views: 3,655
    12-29-2010, 09:13 AM Go to last post
  18. Question Which statiscal analysis to use?

    I'm doing a soil quality comparisson between 3 different sites. I have the following data: 30 samples from each site for indicator number one ...

    Started by Flora1‎, 12-28-2010 04:26 PM
    • Replies: 8
    • Views: 2,175
    01-01-2011, 06:19 PM Go to last post
  19. How to do this calculation? Balanced pairing of two groups

    I have two groups of information. Consonants (15 values in total): sz* 17,40 % kcq* 10,63 % f* 9,30 % b* 9,10 % t* 7,43 % p* 6,22 %

    Started by Matias‎, 01-02-2011 12:45 PM
    • Replies: 8
    • Views: 2,409
    01-03-2011, 01:05 PM Go to last post
  20. what is this experimental design?

    I've inherited an experiment that I need to analyze and describe. The attached picture shows the setup. Background: We're trying to determine...

    Started by FerroPlasm‎, 01-06-2011 09:20 AM
    • Replies: 8
    • Views: 3,721
    01-07-2011, 09:47 AM Go to last post
  21. [Solved] Problem with regards to Poisson! Need some help.

    Provided information; No. of particles in sample / No. of samples 0 / 32 1 / 47 2 / 37 3 / 18 4 / 4 5 / 2

    Started by bkk‎, 01-08-2011 09:56 AM
    solved
    • Replies: 8
    • Views: 6,195
    01-09-2011, 08:55 PM Go to last post
  22. Problem Major Headache (Pharmacy Student)

    I would be very grateful if someone could point me in the right direction on this one : % improvement in bone density over fixed period of...

    Started by Kieran578‎, 03-10-2011 05:55 PM
    • Replies: 8
    • Views: 3,618
    03-11-2011, 01:55 PM Go to last post
  23. Probability

    Hi everyone, for some reason I can't find out how to solve this problem... The question is ... -- In a particular year, 40% of home sales were...

    Started by tufail245‎, 03-17-2011 02:46 PM
    • Replies: 8
    • Views: 3,528
    03-18-2011, 12:01 PM Go to last post
  24. Can I use ANOVA for this?

    Ok this may be a little difficult to explain so please bear with me... Trying to decide on which statistical test I need to analyse my data. I...

    Started by rootsman‎, 03-23-2011 10:19 AM
    • Replies: 8
    • Views: 3,524
    03-24-2011, 10:58 PM Go to last post
  25. Question regarding finding midpoints, relative frequency and cumulative frequency

    I was given a list of numbers as listed below: 91 472 279 249 530 376 188 341 266

    Started by BROOKIREDD‎, 04-02-2011 09:48 AM
    • Replies: 8
    • Views: 9,736
    04-02-2011, 01:58 PM Go to last post
  26. Clueless Pharmacy student with a stats project to do

    Hi - as you can see statistics is of no relevence to my degree but all the same I have a project to do due for next week. If anyone could help me...

    Started by Kieran578‎, 04-15-2011 07:51 PM
    • Replies: 8
    • Views: 3,518
    04-16-2011, 11:39 AM Go to last post
  27. Is this question as simple as it seems?

    Fluorescent light tubes used by a firm have a target life of 1600 hours. However, accumulated data shows a mean time to failure of 1570 hours. What...

    Started by amahesh2012‎, 04-28-2011 12:32 AM
    • Replies: 8
    • Views: 2,041
    04-28-2011, 01:06 AM Go to last post
  28. My stats just don't work!

    data method is incorrect

    Started by Persona‎, 05-05-2011 04:44 AM
    • Replies: 8
    • Views: 6,164
    06-15-2011, 08:44 PM Go to last post
  29. Question Easy question about covariance / beta

    Hi, I have a relatively easy question: Suppose that you have the mean and variance of two variables x y. for instance mean(x) =0,2 ; mean(y) =...

    Started by kross‎, 05-24-2011 03:19 PM
    • Replies: 8
    • Views: 5,389
    05-24-2011, 05:07 PM Go to last post
  30. Should I transform my response data (count data)? Impact on subsequent analyses?

    Hello, My response variables are derived from count data. I have the biennial winter population counts of a hibernating mammalian species (sites / n...

    Started by nofunsally‎, 06-05-2011 10:20 PM
    • Replies: 8
    • Views: 6,469
    06-07-2011, 04:22 PM Go to last post
  31. Calculating SSAxB or MSAxB, two-way crossed ANOVA

    Hello, I've got a homework to do which concerns a two-way crossed ANOVA. Complete data is not given, but I have mean and standard deviation for...

    Started by Dusan‎, 06-13-2011 09:27 AM
    • Replies: 8
    • Views: 4,808
    06-13-2011, 01:28 PM Go to last post
  32. Correlation between dichotomous and ordinal variables

    Hi everyone, I am very thankful for your feedback on my eventually simple question: I want to calculate the correlation between a dichotomous...

    Started by ldwg‎, 06-15-2011 08:01 AM
    correlation, dichotomous iv, ordinal dv
    • Replies: 8
    • Views: 16,858
    06-24-2011, 06:41 AM Go to last post
  33. Nonparametric equivalent for (factorial) MANOVA?

    I once had some experience in SPSS/statistical testing, but now I really need it, I cannot seem to find the appropriate tests. I hope anyone can...

    Started by owj_315‎, 07-07-2011 02:07 PM
    • Replies: 8
    • Views: 9,087
    07-08-2011, 08:40 AM Go to last post
  34. Contrasts in R for two-way and three-way interactions

    I am new to using R and have just performed some mixed effect models which have significant 2-way and 3-way interactions. My question is now that I...

    Started by jmike‎, 07-11-2011 04:32 PM
    contrasts, mixed effect, r-project
    • Replies: 8
    • Views: 9,715
    07-14-2011, 07:31 AM Go to last post
  35. How to test when series of data becomes not significant...

    Hello, I am trying to figure out what test to use in order to solve a fairly basic concept. I am not sure if this is a cenvergence test or a...

    Started by labrookie‎, 07-20-2011 01:08 PM
    • Replies: 8
    • Views: 2,215
    07-21-2011, 09:42 AM Go to last post
  36. Basic - Mean or median?

    Hello all, Quite a basic question here, but just looking for other opinions. When deciding which measure of central tendency to use, I tend to...

    Started by Linguist_‎, 07-31-2011 01:08 PM
    • Replies: 8
    • Views: 3,964
    08-02-2011, 02:03 AM Go to last post
  37. Maximum Likelihood Estimation

    Hi, I have a table in which I have data. some of these data are either missing or not reliable which indicated with "S". I would like to use MLE...

    Started by goligol‎, 08-12-2011 09:50 AM
    • Replies: 8
    • Views: 2,768
    08-15-2011, 02:20 PM Go to last post
  38. normal distribution need help

    Suppose we take random sample of size n=25 from a normal distribution with mean 10 and standard deviation 5. If samples of size 25 are taken...

    Started by aniruddha.moitra‎, 09-02-2011 05:46 AM
    • Replies: 8
    • Views: 2,977
    09-03-2011, 10:23 AM Go to last post
  39. Question Continuous or Discrete: Likert-type Time

    Hi! Sorry for asking a very basic question. I'm not good at stats and can't reach someone who knows. I searched the net with many different...

    Started by LycianSage‎, 10-19-2011 10:11 AM
    duration, intensity, level of measurement, likert-type scale, time
    • Replies: 8
    • Views: 6,134
    10-19-2011, 01:02 PM Go to last post
  40. Different significance values from Pearson and Spearman tests

    Hi I am asking for help because I am confused with the interpretaion of the results. The data is obviously non-linear as Pearson coeficient is...

    Started by Grustni‎, 10-18-2011 03:03 AM
    • Replies: 8
    • Views: 7,876
    10-19-2011, 09:05 PM Go to last post
  41. Red face Goodness of Fit.

    Help guys.. I need to answer my " Problem of the Study" in my Research Paper. The question is "Are there significant difference between the...

    Started by tinytinkles‎, 10-04-2011 08:18 AM
    • Replies: 8
    • Views: 2,176
    10-04-2011, 09:36 PM Go to last post
  42. matrix algebra in statistics

    Let say that X ~ Beta(c,d) or X~N(mu,sigma^2) or anything really... does T(a)Xa also have a beta/Normal distribution??? Where a is just a vector....

    Started by roadrage75‎, 10-04-2011 06:54 PM
    • Replies: 8
    • Views: 2,739
    10-05-2011, 09:10 AM Go to last post
  43. problems proving the 4th moment for discrete, cont. cases

    X is a random variable with moments, E, E, E, and so forth. Prove the following is true for i) X is discrete, ii) X is continuous E^4 = E(X^4) -...

    Started by alias‎, 10-07-2011 09:26 PM
    • Replies: 8
    • Views: 4,356
    10-09-2011, 10:48 AM Go to last post
  44. Post-Hoc Analysis with a numerical factor

    Hello, I have a problem that required your help. I have some data that I would like to analysis. It is an experiment with two factors. The first...

    Started by Linda_M‎, 10-24-2011 07:14 PM
    anova, post-hoc
    • Replies: 8
    • Views: 2,615
    10-26-2011, 04:09 AM Go to last post
  45. Do I assume the standard dev is zero?

    I'm testing the hypothesis that my monthly expenditure is 1000. Null = 1000 H1 = >1000 The stats app that I've downloaded onto my phone...

    Started by Layo909‎, 10-27-2011 01:52 PM
    • Replies: 8
    • Views: 3,287
    10-28-2011, 06:17 AM Go to last post
  46. Question Calculation of x2-probability - formula

    Hey guys. I'm currently working with Stata and a nominal data set. I've done a chi^2 test and found a P-value (0.023), but I would really like to...

    Started by starpen‎, 11-12-2011 07:34 AM
    chi, probability
    • Replies: 8
    • Views: 3,195
    11-13-2011, 02:23 PM Go to last post
  47. Probability that sample mean is within the 1 unit of population mean?

    Hello People, I am currently working on the following question: "A sample A is taken from the population. It is of size n1. Calculate the...

    Started by mmmmxx‎, 11-13-2011 04:50 PM
    • Replies: 8
    • Views: 14,877
    11-13-2011, 05:42 PM Go to last post
  48. Assignment for a stats class: hypothesis testing and alike

    Hey everyone ! I am having a few issues with my assignment. This is question 1, I will make a second thread for question 2. Here is Question 1:...

    Started by Puma‎, 11-20-2011 07:36 PM
    • Replies: 8
    • Views: 6,737
    11-23-2011, 11:24 AM Go to last post
  49. Post Lack of fit meaning

    Hello! I am a researcher fellow in the chemical engineering area and recently applied experimental design to my experiments. However I am having...

    Started by Nekas‎, 11-21-2011 11:51 AM
    lack-of-fit
    • Replies: 8
    • Views: 12,780
    11-23-2011, 04:47 AM Go to last post
  50. Stats help please.

    Consider a sample size of 100 with a standard deviation of 10. a) What is the probability that the sample mean will be within 1 of the value of...

    Started by smithafield‎, 11-30-2011 02:05 AM
    • Replies: 8
    • Views: 2,939
    11-30-2011, 01:26 PM Go to last post
  51. Symbols used in Simple Regression

    I am a little confused about the terminology used in simple regression. The professor taught us that SSY = SSR + SSE. But on our test yesterday,...

    Started by Stickstat‎, 12-02-2011 12:36 PM
    • Replies: 8
    • Views: 4,025
    12-02-2011, 02:13 PM Go to last post
  52. Orthogonal Contrasts

    What are orthogonal contrasts?

    Started by statss‎, 12-06-2011 09:48 PM
    a priori, anova, posthoc
    • Replies: 8
    • Views: 3,166
    12-06-2011, 11:54 PM Go to last post
  53. Nonparametric vs Parametric Correlations?

    I ran a variety of tests and they all say my data is non-normal. I ran nonparametric tests (okay, just the Mann-Whitney) but now I wanted to look at...

    Started by statn00b‎, 12-07-2011 12:08 PM
    • Replies: 8
    • Views: 3,007
    12-07-2011, 09:49 PM Go to last post
  54. [SOLVED] [HELP] i need help with them plz

    19. The weights of cats are normally distributed with a known standard deviation of 2 lb. If we take a sample of 64 cats and get a sample mean...

    Started by filmi‎, 12-23-2011 06:28 PM
    • Replies: 8
    • Views: 2,394
    12-24-2011, 10:48 AM Go to last post
  55. Unhappy best test for this non-normal distribution?

    Hello! I've recently been working on a report for some research I conducted in september and I've run into a bit of a problem during the analysis...

    Started by laurao92‎, 01-04-2012 03:18 PM
    non-normal distribution, not normal, rank, spearman's, stats
    • Replies: 8
    • Views: 2,213
    01-10-2012, 12:55 PM Go to last post
  56. Exclamation Urgent help please! Which Statistical methd to use

    Hi, I' trying to finish a report but haven't done stats in years :shakehead I have two data sets measuring microbial growth on food. Data set 1...

    Started by Toolerc‎, 01-25-2012 02:37 PM
    • Replies: 8
    • Views: 2,493
    01-25-2012, 04:36 PM Go to last post
  57. Help me! :(

    I'm in the process of designing a questionnaire study for approx 200 breeders to determine how much knowledge is known about developmental stages....

    Started by pawsies‎, 02-15-2012 10:18 AM
    • Replies: 8
    • Views: 2,190
    02-15-2012, 06:53 PM Go to last post
  58. multivariate stats quick question

    I don't really understand the difference between multivariate methods and non-multivariate methods. My teacher was saying that some other methods are...

    Started by derekb‎, 02-15-2012 08:15 PM
    • Replies: 8
    • Views: 3,254
    02-15-2012, 08:49 PM Go to last post
  59. One Tailed test

    For a positive one tailed test, if the obtained value falls to the left of the critical value, do you retain the null or is there an error?

    Started by jmckay330‎, 02-19-2012 07:12 PM
    • Replies: 8
    • Views: 4,734
    02-19-2012, 07:48 PM Go to last post
  60. Ordinal Data

    I have the following hypothesis: Novice drivers perceive road environments as more difficult when there are more pedestrians. I have the...

    Started by calumll‎, 02-28-2012 01:05 PM
    ordinal data
    • Replies: 8
    • Views: 1,823
    03-01-2012, 10:56 AM Go to last post

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