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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: 196,557
    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: 66,616
    09-30-2005, 09:44 AM Go to last post
  1. Likert scales and statistics

    I am trying to interpret some results I have from a survey that was used to give an insight into opinions about HR and whether these differences...

    Started by kerry1113‎, 03-28-2006 05:19 PM
    • Replies: 1
    • Views: 3,463
    03-29-2006, 03:03 PM Go to last post
  2. helpz!

    1) a car insurance company has determined that 8% of all ddrivers were involved in a car accident last year. among the 15 drivers living on one...

    Started by HemlyFan‎, 03-29-2006 02:27 AM
    • Replies: 0
    • Views: 4,953
    03-29-2006, 02:27 AM Go to last post
  3. Inference about the difference between two population proportions

    Hi. I've been getting an unusual large z-score on one problem. I keep get a z-score of 12.3. In the question: H0: (P1 - P2) = 0 H1 : (P1 -...

    Started by Emawk‎, 03-22-2006 11:33 PM
    • Replies: 3
    • Views: 3,733
    03-29-2006, 12:34 AM Go to last post
  4. Cochran-Armitage Trend Test

    Hello. I have a question on interpreting the results of a Cochran-Armitage Trend Test. I ran the data below in SAS to see if the NH-Black...

    Started by kique‎, 03-28-2006 04:19 PM
    • Replies: 0
    • Views: 5,177
    03-28-2006, 04:19 PM Go to last post
  5. Tukey results

    I was wondering if anyone could provide any assistance in showing me how to report Tukey HSD test results in a table, e.g., what test statistic to...

    Started by Leyritz‎, 03-26-2006 11:45 AM
    • Replies: 1
    • Views: 9,486
    03-27-2006, 11:52 AM Go to last post
  6. Help with almonds!!!

    hey guys i am new here and am having trouble with this problem... Consider the market for almonds. Assume that quantity supplied is a linear...

    Started by Crisco‎, 03-26-2006 09:11 PM
    • Replies: 0
    • Views: 1,729
    03-26-2006, 09:11 PM Go to last post
  7. F test

    With this information: F-Test Two-Sample for Variances 1 0 Mean 43.4333871 48.65021053 Variance 95.63978493 159.8278372...

    Started by rgentil32‎, 03-26-2006 10:48 AM
    • Replies: 0
    • Views: 1,742
    03-26-2006, 10:48 AM Go to last post
  8. regression on count data?

    Hi, I want to know the if there is a relation between a treatment (independent var) and developmental time (dependent variable). The dependent...

    Started by hobglobin‎, 03-21-2006 11:03 AM
    • Replies: 1
    • Views: 2,337
    03-25-2006, 03:21 PM Go to last post
  9. Pre-test questions.

    Greetings. I have 3 questions I need answered in preparation of my final. I could really use the help as I am so close to being ready to taking the...

    Started by pwoodruffe‎, 03-18-2006 06:03 PM
    • Replies: 3
    • Views: 2,580
    03-25-2006, 08:35 AM Go to last post
  10. do not understand evidence of a mean

    My problem states: IQ test scores of 31 seventh-grade girls in a Midwest school district. IQ scores follow a Normal distdribution with standard...

    Started by grays‎, 03-24-2006 06:33 AM
    • Replies: 1
    • Views: 4,356
    03-24-2006, 03:27 PM Go to last post
  11. Stats Project, Can Anyone Help

    I've got a stats project to do for uni about obtaining accurate blood pressure readings. Can anyone have a quick look and maybe tell me where to...

    Started by sarahlow‎, 03-06-2006 07:13 AM
    • Replies: 3
    • Views: 2,684
    03-24-2006, 02:13 PM Go to last post
  12. Lightbulb level of measurement.

    Hi john, I am real confuse when I see zero in the data, in the following I am thinking,:confused: is ordinal but when I see the zero it seems it...

    Started by Amjad‎, 03-23-2006 02:27 PM
    • Replies: 2
    • Views: 2,628
    03-24-2006, 10:56 AM Go to last post
  13. Writing out stats

    i have conducted various t tests and understand that i need to state the t value, d.f value and p value in my results section above my graph. Do...

    Started by xjennax‎, 03-21-2006 09:20 AM
    • Replies: 1
    • Views: 2,497
    03-24-2006, 12:36 AM Go to last post
  14. one sample z test

    Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

    Started by rgentil32‎, 03-21-2006 04:16 PM
    • Replies: 0
    • Views: 1,963
    03-21-2006, 04:16 PM Go to last post
  15. one sample z test

    Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

    Started by rgentil32‎, 03-21-2006 04:14 PM
    • Replies: 0
    • Views: 1,811
    03-21-2006, 04:14 PM Go to last post
  16. Can propensities and percentages be compared?

    Hi, I'm new to the world of statistical modelling and have recently have been given a model to update. The model currently assigns a propensity...

    Started by aselldurn‎, 03-19-2006 07:25 PM
    • Replies: 0
    • Views: 2,000
    03-19-2006, 07:25 PM Go to last post
  17. stuck on sample size determination

    hi, im working on verifying that a sample is large enough. i have nielsen data showing that 32.5% of a n=2842 sample of women 25-54 (of whom the...

    Started by oldmanriver‎, 03-16-2006 11:46 PM
    • Replies: 2
    • Views: 2,083
    03-19-2006, 07:24 PM Go to last post
  18. estimate/probability

    With this information: Within the state,about 10.47% of faculty members serve as admin. or receive admin. salary supplements. Female with admin...

    Started by rgentil32‎, 03-19-2006 03:22 PM
    • Replies: 0
    • Views: 1,800
    03-19-2006, 03:22 PM Go to last post
  19. statistically significant

    I was asked the following: Is the average salary for female faculty members significantly different from the national average public school salary...

    Started by rgentil32‎, 03-15-2006 04:12 PM
    • Replies: 2
    • Views: 3,393
    03-19-2006, 03:10 PM Go to last post
  20. r and p in regression

    Hi John: I am still not clear about a regression graph. When r is 0.66 and p-value is 0.02, this is moderate to strong correlation and real,...

    Started by Susanbwh‎, 03-12-2006 12:55 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,978
    03-19-2006, 01:38 PM Go to last post
  21. Power analysis

    While researching, I came across the term "power analysis". I am not sure if this term is: 1. Analysis software? 2. Another type statistical...

    Started by Suzy‎, 03-19-2006 12:09 PM
    • Replies: 1
    • Views: 2,586
    03-19-2006, 01:16 PM Go to last post
  22. Basic question regarding methods

    Anyone: 1. How many different statistical methods/tests are there? Hundreds? thousands? (ANOVA, chi-square, etc.) 2. Why are there so many...

    Started by Suzy‎, 03-15-2006 08:39 PM
    • Replies: 3
    • Views: 1,916
    03-18-2006, 05:28 PM Go to last post
  23. Red face need to know if I am on the right track

    Hi, working on a study guide for a test...have a problem that deals with binomial distribution. want to know if I am on the right track here. here...

    Started by tysull‎, 03-17-2006 06:31 PM
    • Replies: 4
    • Views: 2,544
    03-17-2006, 08:57 PM Go to last post
  24. width of 90% CI and 95% CI

    Why is the width of the 90% CI different than that for the 95% confidence interval? My work: The width of the 90% CI differs than that of the 95%...

    Started by rgentil32‎, 03-17-2006 05:26 PM
    • Replies: 1
    • Views: 8,061
    03-17-2006, 06:11 PM Go to last post
  25. p value

    when finding p value for chi square test or t test, does it matter whether it's a one sample or two sample test? EX: in order to find the p value...

    Started by ajk003‎, 03-17-2006 05:30 AM
    • Replies: 1
    • Views: 2,216
    03-17-2006, 12:07 PM Go to last post
  26. Calculating a binomial probability

    Hello, I have a distribution of observed B values that vary with x. I am fitting a distribution to this and do not have a problem with this. ...

    Started by FailedStats101‎, 03-17-2006 07:20 AM
    • Replies: 0
    • Views: 2,404
    03-17-2006, 07:20 AM Go to last post
  27. comparing and contrasting 95% CIs

    I have to do the following: Compare and contrast the 95% CI for the male and female faculty members. What is the significance of whether or not the...

    Started by rgentil32‎, 03-16-2006 04:29 PM
    • Replies: 1
    • Views: 1,816
    03-16-2006, 08:14 PM Go to last post
  28. confusing.

    on last problem of a study guide for statistics test. having problems figuring it out. is this binomial distribution or random variable and how do I...

    Started by tysull‎, 03-16-2006 02:58 PM
    • Replies: 1
    • Views: 2,071
    03-16-2006, 03:26 PM Go to last post
  29. Hypothesis testing Help

    Help!! Got a problem I'm trying to work out and could use your assistance.... "Hypothesis Testing 3. The director of admissions at the...

    Started by khoops111‎, 03-14-2006 11:48 PM
    • Replies: 1
    • Views: 2,195
    03-16-2006, 09:58 AM Go to last post
  30. Smile Satistics skewness

    if statistics skewness is -1.401 for a small sample of 17.what does it mean? Does it mean it is skewed to the left? or to the right? Is -1.401 a...

    Started by wrongturn_rodeo‎, 03-15-2006 06:33 AM
    • Replies: 1
    • Views: 1,919
    03-16-2006, 09:48 AM Go to last post
  31. t-test

    I'm confused about when to use a t test for two independent samples and when to use a repeated measures t test. When there is a pacebo group in an...

    Started by ajk003‎, 03-15-2006 02:18 AM
    • Replies: 1
    • Views: 1,902
    03-16-2006, 08:49 AM Go to last post
  32. Smile Questions on Correlation Concepts

    Hypothetically, say that I've found that the score for some physical health test (T) is strongly correlated to the time I spend working out in a gym...

    Started by Arora‎, 03-14-2006 01:22 AM
    • Replies: 2
    • Views: 2,840
    03-15-2006, 07:04 AM Go to last post
  33. Smile Principal Component Analysis

    Are the sample variances of principal components always positively biased compared to population variances? I know that the first principal component...

    Started by Arora‎, 03-15-2006 06:53 AM
    • Replies: 0
    • Views: 3,581
    03-15-2006, 06:53 AM Go to last post
  34. margin of error

    Find the minimum sample size you should use to assure that your estimate of p^ will be within the required margin of error around the population p....

    Started by hannao1‎, 03-14-2006 09:42 AM
    • Replies: 3
    • Views: 6,047
    03-15-2006, 06:26 AM Go to last post
  35. confidence interval

    With the following data (male): Mean 47.281 Stand. E 1.615 Stand. D 11.53 Count (N?) 51 I estimated the 95% confidence interval for the mean...

    Started by rgentil32‎, 03-14-2006 10:55 PM
    • Replies: 1
    • Views: 2,141
    03-14-2006, 11:08 PM Go to last post
  36. r values, which section?

    Having conducted various Pearsons tests to test for relationships, i have noted the r value for each of the variables tested. I understand that +1...

    Started by xjennax‎, 03-14-2006 07:56 PM
    • Replies: 1
    • Views: 1,919
    03-14-2006, 09:43 PM Go to last post
  37. confidence interval

    I have a problem I would like to know if I am doing it right. Use the degree of confidence and sample data to construct a confidence interval for...

    Started by hannao1‎, 03-14-2006 09:32 AM
    • Replies: 2
    • Views: 5,582
    03-14-2006, 09:51 AM Go to last post
  38. variables help

    hey i know this is a basic question but i am stuck and not sure what is the right answer "Match the following variables on the left with their...

    Started by kutay‎, 03-14-2006 06:38 AM
    • Replies: 1
    • Views: 1,947
    03-14-2006, 09:18 AM Go to last post
  39. sample size

    Im stuck again!! scores on a certain test are normally distributed with a varience of 82. A researcher wishes to estimate the mean score...

    Started by tejay‎, 03-12-2006 11:18 PM
    • Replies: 1
    • Views: 3,585
    03-13-2006, 12:05 AM Go to last post
  40. confidence and margin of error

    im not sure if im reading this question correctly? A political action committee is interested in finding out what kind of popular support they...

    Started by tejay‎, 03-12-2006 07:22 PM
    • Replies: 2
    • Views: 3,345
    03-12-2006, 08:29 PM Go to last post
  41. Stats Report

    I have to write a 500 word stats report on the following data: Batch 1 Batch 2 Min Value 26.1 26.1 Q1 29.6 28.4 Median 31.2 30.3...

    Started by LindaM‎, 03-12-2006 07:45 PM
    • Replies: 0
    • Views: 2,140
    03-12-2006, 07:45 PM Go to last post
  42. Confidence interval

    John, Thanks for defining (interpreting) confidence intervals in language that I can understand! I am using a textbook that is really confusing to...

    Started by Suzy‎, 03-11-2006 03:10 PM
    • Replies: 4
    • Views: 2,094
    03-11-2006, 05:02 PM Go to last post
  43. question about t-test

    Im a little confused about the difference between a t test for one sample, for two independent sample, and two related samples. For this problem: ...

    Started by ajk003‎, 03-10-2006 03:36 PM
    • Replies: 3
    • Views: 2,532
    03-10-2006, 04:20 PM Go to last post
  44. which test?

    more help needed! i have attached a word document showing a table that i need to analyse. basically it shows the mean differences between control...

    Started by xjennax‎, 03-09-2006 02:42 PM
    • Replies: 5
    • Views: 2,198
    03-10-2006, 12:22 PM Go to last post
  45. Regression equation

    Hey everyone, I'm a social scientist not a statistic, so forgive me my basic question. does anyone here know a good tutorial on regression...

    Started by Maarten‎, 03-10-2006 05:56 AM
    • Replies: 1
    • Views: 2,980
    03-10-2006, 10:15 AM Go to last post
  46. Isolating an effect for a distribution

    Hello stats gurus, I'm working on a project that has been perplexing me for a bit... I have 24 histograms (one for each hour of the day). ...

    Started by Embee‎, 03-01-2006 01:29 PM
    • Replies: 7
    • Views: 3,216
    03-10-2006, 09:11 AM Go to last post
  47. Which categorical statistic? Help please

    Hi, For my project I am using statistical methods to create useful information in a spreadsheet. I have a spreadsheet with types of products at...

    Started by sat384‎, 03-09-2006 03:38 PM
    • Replies: 1
    • Views: 2,130
    03-09-2006, 03:53 PM Go to last post
  48. Correlation Home Work Review

    Attached is my assignement for this week can you look it over and tell me what you think. Thanks

    Started by mcafeep‎, 03-08-2006 03:15 PM
    • Replies: 6
    • Views: 2,778
    03-09-2006, 01:46 PM Go to last post
  49. Loglinear analysis abnormality

    Let me first explain the dataset, before I explain the abnormality (well according to me anyway).. I have 4 factors: Organisation, colour, display...

    Started by Neuro‎, 03-08-2006 11:47 AM
    • Replies: 2
    • Views: 2,475
    03-09-2006, 05:39 AM Go to last post
  50. Dealing with nonresponses

    What can be done to compensate nonresponses in the sample (Aside from eliminating them, that is.)? Should they always be excluded from the sample...

    Started by Emawk‎, 03-05-2006 10:20 PM
    • Replies: 8
    • Views: 2,923
    03-08-2006, 11:42 PM Go to last post
  51. Statistic problem consiting of Student t-test problem

    Hi, I'm stuck on a question and was wondering if you guys could help me. This is the problem I have a question about: This question continues on...

    Started by Emawk‎, 03-04-2006 09:55 PM
    • Replies: 12
    • Views: 9,573
    03-08-2006, 08:04 PM Go to last post
  52. confidence interval plus some

    Hi I'm working on a question that asks me to find the constant c so that c(Xbar-X(n+1))/S has a t distribution. We're given that X1, X2, ......Xn,...

    Started by tidus‎, 03-05-2006 07:11 PM
    • Replies: 5
    • Views: 2,225
    03-08-2006, 07:45 PM Go to last post
  53. unequal and unknown variances

    Hi, We have a question on our homework that asks us to discuss the difficulty with unknown and unequal variances with respect to a t-distribution. I...

    Started by tidus‎, 03-08-2006 06:44 PM
    • Replies: 0
    • Views: 2,602
    03-08-2006, 06:44 PM Go to last post
  54. Normal or not?

    hi, my first post on this site. im in need of desperate help. currently going through my dissertation process which includes stats which im hopeless...

    Started by xjennax‎, 03-08-2006 08:57 AM
    • Replies: 5
    • Views: 1,883
    03-08-2006, 09:46 AM Go to last post
  55. Question Not sure what mathmatical route to take

    I am trying to compare the quantities and types of stone artifacts between four different archaeological excavation units from one archaeological...

    Started by mamakmoon‎, 03-07-2006 08:07 PM
    • Replies: 5
    • Views: 2,144
    03-08-2006, 01:35 AM Go to last post
  56. 2 way cross classification ANOVA

    hey there, I need to suggest why when partitioning the total sum of squares in a 2 way cross classification ANOVA into the individual...

    Started by beast‎, 03-07-2006 05:58 PM
    • Replies: 1
    • Views: 3,817
    03-07-2006, 08:16 PM Go to last post
  57. Probability

    100 employees of a company are asked how they get to work and whether they work full time or part time. The figure below shows the results. If one of...

    Started by Melissa920‎, 03-07-2006 07:58 PM
    • Replies: 1
    • Views: 7,039
    03-07-2006, 08:11 PM Go to last post
  58. Project Help

    Attached is a follow on from a previoius thread I think I have it right but need to have someone check it out and give me feed back

    Started by mcafeep‎, 03-07-2006 01:12 PM
    • Replies: 1
    • Views: 2,608
    03-07-2006, 03:22 PM Go to last post
  59. Probability

    A study of consumer smoking habits includes 177 people in the 18-22 age bracket (48 of whom smoke), 146 people in the 23-30 age bracket (31 of whom...

    Started by Melissa920‎, 03-07-2006 01:30 PM
    • Replies: 1
    • Views: 3,640
    03-07-2006, 02:47 PM Go to last post
  60. Z-Score Help

    I have the following question regarding z-score: The mean of a set of data is 0.92 and it's standard deviation is 2.42. Find the z- score for a...

    Started by Melissa920‎, 03-07-2006 02:26 AM
    • Replies: 2
    • Views: 4,000
    03-07-2006, 12:45 PM Go to last post

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