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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: 66,955
    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: 197,168
    07-16-2014, 11:01 AM Go to last post
  1. Help

    I need some assistance with the following 2 questions: Question 1: Assume that you want to test the claim that the paired sample data come from...

    Started by 1NAMILL‎, 11-26-2005 09:41 AM
    • Replies: 3
    • Views: 5,191
    11-27-2005, 10:11 PM Go to last post
  2. Help

    This is the 2nd question: Construct a confidence interval for the mean of the differences d for the population of paired data. Assume that the...

    Started by 1NAMILL‎, 11-26-2005 10:17 AM
    • Replies: 1
    • Views: 3,815
    11-27-2005, 06:24 PM Go to last post
  3. Help

    I too am having trouble with ANOVA. I have 2 questions that I need assistance with. Question 1: Test the claim that the samples come from...

    Started by 1NAMILL‎, 11-29-2005 03:58 PM
    • Replies: 3
    • Views: 8,739
    11-29-2005, 10:11 PM Go to last post
  4. help

    I am having trouble with the folowing question: Use the Poisson Distribution to find the indicated probability. A computer salesman averages...

    Started by 1NAMILL‎, 12-09-2005 12:36 PM
    • Replies: 7
    • Views: 4,686
    12-09-2005, 04:03 PM Go to last post
  5. Thanks

    I just wanted to say thank you to all of you who helped me with Statistics. I received an "F" on my midterm. However, by the time finals came...

    Started by 1NAMILL‎, 12-19-2005 11:40 PM
    • Replies: 1
    • Views: 2,511
    12-20-2005, 12:56 PM Go to last post
  6. Binomial Probability Distribution

    In an experiment on ESP, a subject is asked to state the color (red or blue) of a card chosen from a deck of 25 cards. It is unknown how many red or...

    Started by 1nvictus‎, 04-25-2013 04:00 PM
    • Replies: 0
    • Views: 1,173
    04-25-2013, 04:00 PM Go to last post
  7. Finding Bayes action

    A woman must dcide between waxing her car (action a1) and not waxing her car (a2). She's concerned of the weather on whether it will be sunny (o1)...

    Started by 1nvictus‎, 04-24-2013 08:24 PM
    • Replies: 1
    • Views: 1,345
    04-24-2013, 08:50 PM Go to last post
  8. Determining sample sizes - help much appreciated

    Hi, I have 100 similar machines, each machine produces 650 products per week, which makes a total 65.000 products per week. I want to preform a...

    Started by 2*2=5‎, 03-27-2009 08:47 AM
    • Replies: 0
    • Views: 2,026
    03-27-2009, 08:47 AM Go to last post
  9. Question Chi Square the right test?

    Hi, I have 2 groups of data with yes and no answers at two different time frames. So for example.... Pre Post Group 1 Yes ...

    Started by 2blues13‎, 10-18-2011 10:41 AM
    chi square help what test
    • Replies: 2
    • Views: 2,179
    10-18-2011, 10:52 AM Go to last post
  10. Thumbs up What Test to Use? Survival...

    Hi, I have 4 groups which each have a time to an event in months. I want to figure out if there is any significance between all 4 groups in the...

    Started by 2blues13‎, 10-18-2011 10:02 AM
    survival analysis
    • Replies: 1
    • Views: 1,903
    10-19-2011, 02:46 AM Go to last post
  11. Deriving the variance of the sampling distribution.

    Hi, I guess i am being stupid but i am a little stuck with part of the derivation of the variance of the sampling distribution of the mean. I...

    Started by 2scoops‎, 01-29-2013 05:28 PM
    • Replies: 1
    • Views: 2,709
    01-29-2013, 06:17 PM Go to last post
  12. Testing for difference between two percentages (using confidence intervals)

    Hello, hopefully someone can help me with a question: I wish to test for whether the difference between 2 percentages is significantly different....

    Started by 2scoops‎, 06-14-2013 09:43 AM
    • Replies: 0
    • Views: 1,945
    06-14-2013, 09:43 AM Go to last post
  13. Conducting Factor Analysis on Data with Nominal, Ordinal, and Interval Data

    I would advice on conducting a confirmatory factor analysis on data from an instrument that contains nominal, ordinal, and interval data. I'd think...

    Started by 3.14159‎, 04-29-2015 12:07 PM
    factor analysis, finite mixture model, latent class analysis lca, nominal data, ordinal data
    • Replies: 0
    • Views: 1,966
    04-29-2015, 12:07 PM Go to last post
  14. Cool Sample Size hw question

    The research team has considered your answers to the above. They’ve narrowed their interest to two outcomes (for now): Number of episodes of early...

    Started by 303oselim‎, 12-18-2015 08:37 PM
    • Replies: 0
    • Views: 910
    12-18-2015, 08:37 PM Go to last post
  15. Choosing the correct t-Test

    Hi All: I am looking at health outcome data between hospitals. I measured mortality rate change at year 1, 2 and 3 after an education program...

    Started by 3dmv‎, 04-17-2012 10:01 AM
    • Replies: 3
    • Views: 2,839
    04-18-2012, 01:47 AM Go to last post
  16. Which correlation to use

    Hi, I am trying to run a correlation. The independent variable is a survey score from 1 to 5. The dependent variable is a health outcome rate...

    Started by 3dmv‎, 04-18-2012 07:08 AM
    • Replies: 2
    • Views: 1,744
    04-18-2012, 08:24 AM Go to last post
  17. Arrow Confidence Interval for Population Mean

    I am working on a statistics problem and want to make sure I am on the right track. Here is the problem: The following sample of 16 measurements...

    Started by 3sacharm‎, 11-13-2010 10:07 AM
    • Replies: 6
    • Views: 8,020
    11-13-2010, 11:51 AM Go to last post
  18. Red face Comparing z-values and t-values

    Looking for some feedback as to whether I am on the right track for this problem: Suppose you have selected a random sample of n=7 measurements...

    Started by 3sacharm‎, 11-15-2010 12:37 PM
    • Replies: 1
    • Views: 13,597
    11-15-2010, 01:22 PM Go to last post
  19. Question x-bar distribution

    Question: Is the sampling distribution of x-bar always normally distributed, regardless of the size of the sample n? Answer: No Is this...

    Started by 3sacharm‎, 11-19-2010 01:12 PM
    • Replies: 2
    • Views: 10,368
    11-19-2010, 04:30 PM Go to last post
  20. Rejection regions & Type 1 errors

    Am I correct in using the formular 1-a to find the probability of a Type 1 error with a rejection region of z<-1.645 or z>1.645? I know the...

    Started by 3sacharm‎, 12-03-2010 01:02 PM
    • Replies: 1
    • Views: 5,418
    12-03-2010, 06:30 PM Go to last post
  21. Why is mean with standard deviation better than median with IQR?

    Hi guys, I'm having trouble justifying which representation is more accurate, mean or median. I've calculated both for the set of data however I...

    Started by 3vo‎, 11-21-2013 05:53 AM
    • Replies: 3
    • Views: 3,554
    11-21-2013, 03:11 PM Go to last post
  22. Expected Value of X

    I'm asked to find the excpected value of x-bar, but I'm not sure what method to use here. The information I have: According to AAA, the average cost...

    Started by 402_Bill‎, 11-21-2006 08:47 PM
    • Replies: 1
    • Views: 9,716
    11-22-2006, 11:27 AM Go to last post
  23. Uniforming data to produce better graph

    Hello, forum! This is my first post here and I really hope someone can help me. I have to draw a graph of two very long columns of data. Both...

    Started by 41310602613‎, 03-07-2015 02:42 PM
    • Replies: 0
    • Views: 1,186
    03-07-2015, 02:42 PM Go to last post
  24. Correlation and Significance (SPSS)

    I did a correlation test and can't figure out how to interpret the data. I'm used to getting high Pearson correlations with low significance values,...

    Started by 41310602613‎, 11-18-2015 06:21 PM
    • Replies: 1
    • Views: 1,452
    11-18-2015, 08:12 PM Go to last post
  25. need help with problem

    problem with Poisson distribution, please help The number of dirt specks on a randomly selected square yard of polyethylene film of a certain...

    Started by 4145‎, 09-09-2013 12:16 PM
    • Replies: 0
    • Views: 1,439
    09-09-2013, 12:16 PM Go to last post
  26. Determining sample size for my research

    I am designing a study that looks at rates of colonization with a certain bacteria species among healthcare workers. Basically, we would be testing...

    Started by 44124412‎, 08-18-2014 11:29 AM
    • Replies: 1
    • Views: 1,169
    08-18-2014, 11:38 AM Go to last post
  27. Unsure about the range(s) to use for double integration

    f(x,y)=c(x+y); 3<x<7, 2<y<4, x>y i am supposed to find the value of c. i know i have to integrate the double integration of f(x,y) and then...

    Started by 4april‎, 10-17-2016 12:02 AM
    • Replies: 1
    • Views: 1,805
    10-17-2016, 06:32 AM Go to last post
  28. Finding Confidence level if given confidence interval?

    Here is the problem... Suppose a random sample of size 81 from a normal population with known standard deviation = 40 produced (60,80) as a...

    Started by 4tunate1‎, 04-15-2013 05:55 PM
    • Replies: 2
    • Views: 1,932
    04-16-2013, 11:11 AM Go to last post
  29. How to compare two regression lines?

    Hi, I'm trying to find out if Pearson and Spearman correlations are equally suited for my data. I've computed some Pearson and Spearman correlations...

    Started by 5''‎, 12-22-2012 05:20 PM
    • Replies: 0
    • Views: 2,183
    12-22-2012, 05:20 PM Go to last post
  30. Question Calculating with types of data

    Why can't one compute with values such as 'M(ale)/F(emale)'? Can't I keep a counter of how many males and females were at an event? Am I not...

    Started by 5747157‎, 04-28-2013 09:35 AM
    calculation, nominal, ordinal
    • Replies: 0
    • Views: 882
    04-28-2013, 09:35 AM Go to last post
  31. Post Probability of an event

    A woman bears two babies and they both die. The case goes into court and they hire a statistician to figure out what the chance is of a woman...

    Started by 5747157‎, 04-28-2013 04:22 AM
    event rare probability
    • Replies: 1
    • Views: 939
    04-28-2013, 05:20 AM Go to last post
  32. Question Cumulative relative frequencies

    I have a problem I do not understand. I always end up with result 0.99 instead of 1. See lines 22 and 40: http://pastebin.com/hVcLbVAW Am I not...

    Started by 5747157‎, 04-29-2013 02:26 PM
    cumulative, frequencies, relative
    • Replies: 0
    • Views: 1,092
    04-29-2013, 02:26 PM Go to last post
  33. How to compute the threshold in BML with dynamic SGM?

    Hi I have a few questions regarding statistics and image processing. I'm trying to implement a skin recogniser, to determine if a given texel is...

    Started by 5imon‎, 04-08-2010 05:22 AM
    • Replies: 0
    • Views: 2,611
    04-08-2010, 05:22 AM Go to last post
  34. How to transform a vector that generates the best multivariate Gaussian pdf?

    Hi I have a true positive (TP) and a false positive (FP) 3-vector sample set. From these I want to create two multivariate Gaussian pdf’s, for...

    Started by 5imon‎, 04-15-2010 10:30 AM
    • Replies: 0
    • Views: 2,129
    04-15-2010, 10:30 AM Go to last post
  35. Book recomendation for IT engineer?

    Hi I don't remember much of the sparse amount of statistic education we had at uni. In my work as an engineer I have come across quite a bit of...

    Started by 5imon‎, 04-25-2010 02:43 PM
    • Replies: 2
    • Views: 2,661
    04-25-2010, 03:24 PM Go to last post
  36. What is the correct test for significance?

    I am looking at data from the same survey administered to two different and unequal samples in 2009 and 2012. The survey was a community needs...

    Started by 6d6n6a‎, 09-24-2013 02:31 PM
    • Replies: 5
    • Views: 2,097
    09-25-2013, 01:00 PM Go to last post
  37. How can I figure out the raw score of this data set?

    I must find the raw scores, z-scores, T-scores, and percentile ranks. Note: the Mean = 50, SD = 5. Raw z ...

    Started by 7000milestogo@gmail.com‎, 06-11-2015 12:30 AM
    • Replies: 1
    • Views: 1,974
    06-11-2015, 07:32 AM Go to last post
  38. advice about constant (error coefficient)

    I have 3 regression models; my error/constant values are 3***, 1.2 and 3.4***. My question is: since the 1.2 is insignificant (so this model...

    Started by 7788‎, 04-20-2010 10:19 AM
    • Replies: 0
    • Views: 2,260
    04-20-2010, 10:19 AM Go to last post
  39. existence of unbiased estimator of absolute value of mean

    Does anyone see or have the proof of the following : "There is no unbiased estimator of the absolute value of mean in Normal(myu, 1)" Just...

    Started by 7bumblebees‎, 03-17-2009 09:12 PM
    • Replies: 1
    • Views: 5,314
    03-17-2009, 10:02 PM Go to last post
  40. Interpretation of 99% confidence interval

    Hello guys, this is my first post here in the forum and if I missed anything, then pls correct me. My first statistic class starts this week...

    Started by 7thSlap‎, 09-06-2016 10:32 AM
    • Replies: 8
    • Views: 1,440
    09-06-2016, 04:09 PM Go to last post
  41. Question How to derive R-squared from correlation coefficient?

    How to derive R-squared from correlation coefficient? I need it very much please help

    Started by 8255004‎, 09-20-2014 10:33 PM
    correlation coefficient
    • Replies: 1
    • Views: 2,329
    09-20-2014, 10:39 PM Go to last post
  42. Question Don't know where to begin??

    I'm writing a paper for my political science class. I am at a stand still because I am a complete beginner when it comes to statistical analysis. And...

    Started by 83Benny‎, 02-03-2011 04:22 AM
    • Replies: 0
    • Views: 2,002
    02-03-2011, 04:22 AM Go to last post
  43. Does the difference between males and females between two groups of species differ?

    Background I have body weight measures from seven rodent species in both northern and southern Europe. For each of the total 14 species, I have...

    Started by 8armed‎, 10-27-2016 01:13 AM
    • Replies: 6
    • Views: 1,193
    10-28-2016, 01:51 AM Go to last post
  44. Measures of randomness

    Does anyone have any ideas on how to quantify randomness? More, specifically, I need a measure of clustering. Let's say I have 2 groups within a...

    Started by 8chocinco‎, 04-01-2015 03:09 PM
    • Replies: 3
    • Views: 1,889
    04-01-2015, 08:36 PM Go to last post
  45. dependent normal distribution

    I am given: 1) Y11,...,Y1n are dependent 2) Y1j follows n(theta1,sigma^2), j=1,...,n 3) corr(Y1j,Y1j')=p>0, j not equal to j' How can I find...

    Started by 9521j‎, 12-06-2011 02:57 AM
    • Replies: 3
    • Views: 2,003
    12-06-2011, 05:07 AM Go to last post
  46. Which test to carry out SPSS

    Ive done a questionaire and i want to analyise if there is anything correlation between having seen the algore film and some ones view on climate...

    Started by 98107‎, 10-23-2010 10:05 AM
    • Replies: 4
    • Views: 4,899
    10-24-2010, 05:49 PM Go to last post
  47. explain why... negative becomes positive

    im doing a study on lung cancer associated with air pollution when i iduvidually correlated ethnicity with SMR rate of lung cancer it gives a...

    Started by 98107‎, 10-25-2010 05:36 PM
    • Replies: 3
    • Views: 3,631
    10-26-2010, 04:09 AM Go to last post
  48. easy question, if your not as thick as me!

    (this is in a lineear regression model) If i square the standardized coefecient number of all the varaibles then multiply to give me the...

    Started by 98107‎, 10-26-2010 03:55 PM
    • Replies: 1
    • Views: 2,199
    10-26-2010, 04:55 PM Go to last post
  49. What type of graph would i use?

    Sorry if this is the wrong section first of all, Basically i have for each year how many tonnes of carbon the accumlative nuclear power points...

    Started by 98107‎, 03-18-2011 07:44 AM
    • Replies: 3
    • Views: 2,516
    03-18-2011, 02:51 PM Go to last post
  50. What sort of data is this? In a pickle

    Hi, sorry first of all if is could be suited more towards a different catagory. Basically ive done questionaire and one question is : 3....

    Started by 98107‎, 11-10-2011 02:40 PM
    climate, likert, ordinal, test
    • Replies: 13
    • Views: 2,838
    11-10-2011, 06:50 PM Go to last post
  51. Is this ordinal?

    Hi, My question in a survey is "What do you belive the general view of experts is regarding the causes of Climate change" and the answer...

    Started by 98107‎, 11-11-2011 08:27 AM
    climate, nominal variable, ordinal, questionnaire
    • Replies: 3
    • Views: 2,863
    11-11-2011, 03:37 PM Go to last post
  52. What test to use?

    I hope you can help I want to compare education level which consists of 5 catagories: None, GCSE, Alevels, Degree, Postgrad As each one is...

    Started by 98107‎, 11-16-2011 07:10 AM
    • Replies: 3
    • Views: 1,579
    11-16-2011, 10:02 AM Go to last post
  53. What sampling method is this?

    Hi, I hope you can help. I collected my samples on the street by just asking passers by to fill in my questionnaire. I moved to 5 different...

    Started by 98107‎, 01-02-2012 04:30 PM
    sampling, sampling design
    • Replies: 4
    • Views: 2,157
    01-03-2012, 10:41 AM Go to last post
  54. Need a couple examples to get me going in the right direction...

    The outside diameter of a part used in a gear assembly is known to be normally distrubuted with a mean of 40mm and standard deviation of 2.5mm. the...

    Started by 98ls10‎, 02-03-2013 10:00 PM
    • Replies: 1
    • Views: 2,440
    02-04-2013, 12:20 AM Go to last post
  55. Is this a completely randomized design?

    Hello everyone, I am wanting to make sure that what I have is a completely randomized design. This is not homework, but rather thesis research. It...

    Started by 98mazdaman‎, 03-12-2017 09:06 PM
    • Replies: 0
    • Views: 1,059
    03-12-2017, 09:06 PM Go to last post
  56. election question

    heyy ive done most of the homework from this weeks h/w from school but im having problems with this question; ive got a quizz next monday and i...

    Started by 99.nine‎, 05-27-2008 05:14 PM
    • Replies: 0
    • Views: 2,964
    05-27-2008, 05:14 PM Go to last post
  57. May need some help!

    Hello, I am new to this forum and i was wondering if i could get some help with a few problems i cannot crack. Racking my brain on them. Thank you,...

    Started by A Stats Guy‎, 04-27-2009 02:16 PM
    • Replies: 1
    • Views: 1,827
    04-27-2009, 04:24 PM Go to last post
  58. power analysis- interpreting sample size given established literature

    Hello and thank you for clicking, I am attempting to use relevant effects size from a published study to obtain a suggested sample size for my...

    Started by a. whit‎, 02-24-2015 06:38 PM
    anova, effect size, gpower, power analysis, sample size calculation
    • Replies: 3
    • Views: 1,224
    02-25-2015, 05:25 PM Go to last post
  59. Theory testing

    Hi guys (First Post, woop!) Im currently attempting to draft a PhD proposal investigating the role of optimism in Seligman's Well Being Theory but...

    Started by a.b.barker‎, 03-06-2012 12:10 PM
    • Replies: 9
    • Views: 1,883
    03-06-2012, 02:06 PM Go to last post
  60. Exponential Family-Example

    I have the following question. Does anybody know an example where the MLE is biased for an exponential family distribution, i.e. ...

    Started by A.C‎, 10-07-2014 09:39 AM
    biased, exponential family
    • Replies: 1
    • Views: 1,161
    10-07-2014, 10:55 AM Go to last post

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