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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: 196,787
    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: 66,774
    09-30-2005, 09:44 AM Go to last post
  1. Large Sample Tests

    I need help with this question. Can anyone help explain how the answers below were obtained. Thanks in advance. The frequency distribution of...

    Started by skhan‎, 05-30-2006 01:47 PM
    • Replies: 0
    • Views: 2,518
    05-30-2006, 01:47 PM Go to last post
  2. Question Confused on Exponential PDF

    Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

    Started by zuludogm‎, 05-30-2006 01:07 AM
    • Replies: 0
    • Views: 2,002
    05-30-2006, 01:07 AM Go to last post
  3. Hypothesis Testing Problem

    Hi again. I have a quick question regarding hypothesis testing. Below is the question that I'm working on: On a national standardized reading...

    Started by Mira‎, 05-26-2006 06:33 PM
    • Replies: 3
    • Views: 7,091
    05-29-2006, 09:13 AM Go to last post
  4. Confused on Exponential PDF

    Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

    Started by zuludogm‎, 05-28-2006 04:13 AM
    • Replies: 0
    • Views: 1,857
    05-28-2006, 04:13 AM Go to last post
  5. transformations of explanatory variable

    If you look at the residuals for some response variable y regressed on some explanatory variable x and you see some pattern, e.g. the residuals seem...

    Started by macro90‎, 05-28-2006 12:55 AM
    • Replies: 0
    • Views: 3,296
    05-28-2006, 12:55 AM Go to last post
  6. Question about multivariate regression results

    I'm a PhD candidate working with my dissertation data in organizational theory. I'm having trouble understanding my data results and have a few...

    Started by phd-cand‎, 05-24-2006 01:45 PM
    • Replies: 0
    • Views: 2,503
    05-24-2006, 01:45 PM Go to last post
  7. Question Analysis of three difference samples

    Hi there, I have surveyed three separate populations frome which I have obtained fairly representative samples. One was a stratified sample (as...

    Started by max‎, 05-24-2006 04:30 AM
    • Replies: 0
    • Views: 1,924
    05-24-2006, 04:30 AM Go to last post
  8. Checking solutions

    Hey I have been working on an assignement but I am pretty lost with it all. I have attatched it and the answers I have so far, any feedback or hints...

    Started by Taka‎, 05-23-2006 11:05 PM
    • Replies: 0
    • Views: 2,194
    05-23-2006, 11:05 PM Go to last post
  9. errors??

    hi there!!:wave: i have a question!im completely getting confused, what is the difference between error term, error variance, experimetal...

    Started by tele‎, 05-23-2006 02:44 PM
    • Replies: 0
    • Views: 2,007
    05-23-2006, 02:44 PM Go to last post
  10. z or t Argggggggg

    Among trained typists, suppose the average typing speed on an electric typewriter is 60 words per minute (wpm), with a standard deviation of 5 wpm....

    Started by beenawhile‎, 05-23-2006 07:20 AM
    • Replies: 2
    • Views: 1,865
    05-23-2006, 08:27 AM Go to last post
  11. textbook question

    im having trouble with this question - i dont know how the textbook arrived at the answer of losing 1.3 cents per game on average A gambler...

    Started by aptiva‎, 05-21-2006 09:32 PM
    • Replies: 3
    • Views: 3,190
    05-23-2006, 08:18 AM Go to last post
  12. determining mean without Z score

    Hello, Not looking for the answer, I've just got myself confused. The scenario I have is: I have been given the Standard deviation figure 14.62...

    Started by Ade‎, 05-17-2006 02:25 AM
    • Replies: 4
    • Views: 2,900
    05-22-2006, 09:02 PM Go to last post
  13. Can somebody check this one two

    If the mean life of an aircraft engine part is 510 hours and the standard deviation is 30 hours, what percentage of parts lasts no more than 462...

    Started by beenawhile‎, 05-21-2006 07:43 AM
    • Replies: 4
    • Views: 2,844
    05-22-2006, 05:45 AM Go to last post
  14. Kind of embarrasing

    Question A study discovered that that income of students is normally distributed, with an average annual income of $17,500, and a standard deviation...

    Started by beenawhile‎, 05-21-2006 07:30 AM
    • Replies: 3
    • Views: 2,777
    05-22-2006, 05:44 AM Go to last post
  15. population proportions...

    Hello, Suppose you have a problem to solve in which 71% of Internet users connect using standard telephone lines. The population proportion is...

    Started by half-life‎, 05-21-2006 04:08 PM
    • Replies: 3
    • Views: 1,793
    05-21-2006, 10:11 PM Go to last post
  16. poisson distribution

    hello there, I've been staring at this question for quite some time now but to no avail :( "The discrete random variable X has a truncated...

    Started by beast‎, 05-21-2006 03:41 PM
    • Replies: 0
    • Views: 1,705
    05-21-2006, 03:41 PM Go to last post
  17. hypothesis tests

    im really bad with these kind of questions regarding null/alternative hypotheses and the probability of them being true/rejected does any one have...

    Started by skhan‎, 05-21-2006 02:23 PM
    • Replies: 1
    • Views: 2,193
    05-21-2006, 03:10 PM Go to last post
  18. comparing likert data scores

    Hi...I don't know why this question is so hard to find an answer on. I have a simple situation. I created a questionnaire with 6 point likert answers...

    Started by ehb23‎, 05-20-2006 06:15 PM
    • Replies: 3
    • Views: 6,789
    05-21-2006, 02:07 PM Go to last post
  19. Question Correlation between groups

    Hie, I would like to run correlation between my dependent (behaviors) and independent (stressors) variables. I have 10 variables for Behavior, and...

    Started by Nee‎, 05-18-2006 09:40 AM
    • Replies: 3
    • Views: 2,406
    05-20-2006, 08:01 AM Go to last post
  20. probability distribution Q

    A player rolls two dice and is awarded 1 point if the same number appears on the upface of both dice. If different numbers appear, he gets no points....

    Started by skhan‎, 05-18-2006 03:58 PM
    • Replies: 6
    • Views: 2,969
    05-19-2006, 10:10 PM Go to last post
  21. binomial/hypothesis tests

    hello for the following question i was able to answer part A and B but i dont know how to answer part C ...

    Started by aptiva‎, 05-17-2006 10:38 AM
    • Replies: 1
    • Views: 2,427
    05-19-2006, 01:45 PM Go to last post
  22. How to compare multiple groups with multiple covariates?

    Hello, Suppose you have a data set comprising 10 cases of 3 classes and 15 features (no assumptions about the distribution of the 15 features). ...

    Started by Gaston‎, 05-16-2006 01:48 PM
    • Replies: 2
    • Views: 2,790
    05-17-2006, 04:26 AM Go to last post
  23. Angry t tests (psych stats)

    The problem that I'm trying to solve is this: "Twenty college juniors were randomly selected from a group of volunteers and arbitrarily assigned...

    Started by Kylah‎, 05-14-2006 10:59 PM
    • Replies: 3
    • Views: 2,628
    05-16-2006, 07:58 PM Go to last post
  24. Homegeneity Tests

    Hie, This question is regarding the assumption for ANOVA on having the variances equal for all populations. Have read that if this assumption is...

    Started by Nee‎, 05-15-2006 11:27 AM
    • Replies: 1
    • Views: 1,882
    05-16-2006, 07:21 PM Go to last post
  25. Post f test!

    In analysis of varience. whay we use mostly single tailed,one tailed f test.why dont we use the two tailed. and under which konditions we use the...

    Started by waqasemran‎, 05-16-2006 03:58 PM
    • Replies: 1
    • Views: 1,903
    05-16-2006, 06:53 PM Go to last post
  26. stats terminology

    hey can some confirm if my answers to this question is correct? thanks Classify the following variables as either quantitative or qualitative,...

    Started by skhan‎, 05-15-2006 08:51 PM
    • Replies: 1
    • Views: 2,266
    05-16-2006, 03:00 PM Go to last post
  27. continuous random variables

    how would i compute the answer to the following question: Scores on a particular test are normally distributed in the population with a mean of...

    Started by skhan‎, 05-15-2006 03:48 PM
    • Replies: 1
    • Views: 2,343
    05-16-2006, 02:28 PM Go to last post
  28. Question Report Statistics

    I need help finding a statistic that can be used on a daily production report I produce at work. Here's the info I have: Daily Budgeted/Expected...

    Started by JDC‎, 05-16-2006 10:45 AM
    • Replies: 2
    • Views: 2,652
    05-16-2006, 11:42 AM Go to last post
  29. correlation question

    I have a question regarding a simple correlation of estimated rather than known values. Letís say I am interested in the correlation between A and...

    Started by MSU07‎, 05-15-2006 12:36 PM
    • Replies: 1
    • Views: 2,220
    05-16-2006, 11:34 AM Go to last post
  30. Hypothesis Test Writing

    I am trying to remember the correct way to write hypotheses, as I am a bit out of practice. I am conducting bivariate analysis on variables...

    Started by mengland00‎, 05-14-2006 04:40 PM
    • Replies: 2
    • Views: 2,158
    05-14-2006, 06:16 PM Go to last post
  31. Question Multivariate analysis for categorical dependent

    Hi all, I have a question about multivariate analysis. I'm using SPSS 12. My dataset includes two variables, "cT_stage" (1,2,3,or 4) and...

    Started by lee_alkureishi‎, 05-14-2006 11:00 AM
    • Replies: 1
    • Views: 4,075
    05-14-2006, 05:47 PM Go to last post
  32. Determing Z score from level of confidence

    How can I determine the Z score, given a level of confidence of 65%. My math book has the z score for .80, .90, .95, and .99 but none other. ...

    Started by nappyjim‎, 05-13-2006 07:11 PM
    • Replies: 1
    • Views: 36,752
    05-14-2006, 10:03 AM Go to last post
  33. mean, mode, mediam

    Hello, I have a question about mean, mode, and median is it possible to compute them using a date? example.. 29 Apr 2006 Thank you for your...

    Started by Statumped‎, 04-29-2006 07:23 PM
    • Replies: 3
    • Views: 2,906
    05-13-2006, 10:38 PM Go to last post
  34. Trying to fit normal dist. to quartile data

    I have taken a test to get into graduate school and have scored a 160. The range of scores is 120 to 180. The school I have applied to has...

    Started by CRSmith‎, 05-12-2006 10:38 PM
    • Replies: 3
    • Views: 3,043
    05-13-2006, 10:35 AM Go to last post
  35. Red face median test or 2 sample kolmogorov test ?

    Hi I have the following problem: My data is generally non normal distributed and therefore I use the 2 sample Mann Whitney Test for comparisons. ...

    Started by sirhoppel‎, 05-13-2006 07:27 AM
    • Replies: 0
    • Views: 2,915
    05-13-2006, 07:27 AM Go to last post
  36. What test do I use?

    hi john i am trying to work out what inferential test i should use on my data. in brief my study involves looking at the effectiveness of a...

    Started by coleslaura‎, 05-13-2006 05:59 AM
    • Replies: 0
    • Views: 2,257
    05-13-2006, 05:59 AM Go to last post
  37. Sample Size

    Would like to learn the correct technique to caculate sample sizes. We are working with truck tires and determining the number of miles we get from...

    Started by west4961‎, 12-10-2005 05:33 PM
    • Replies: 4
    • Views: 3,106
    05-13-2006, 05:34 AM Go to last post
  38. R value Anova

    Hi all can someone tell me when we are assessing the significance vlaue in ANOVA, do we measure it against the adjusted R value provided at the...

    Started by jenny‎, 05-08-2006 12:57 PM
    • Replies: 8
    • Views: 3,899
    05-12-2006, 09:16 AM Go to last post
  39. Help with choosing the right method

    Hi I'm new to stats as you will probably become aware. Just need a little help to understand which statistical method should be used to test a...

    Started by scotchpie‎, 05-02-2006 01:35 PM
    • Replies: 8
    • Views: 2,755
    05-12-2006, 08:52 AM Go to last post
  40. Trouble with Hypothesis testing (Psych. Stats)

    I'm still really sketchy on hypothesis testing, even after reading the chapter in my book twice and watching the video lecture for this topic twice. ...

    Started by Kylah‎, 05-11-2006 12:35 PM
    • Replies: 2
    • Views: 2,754
    05-11-2006, 03:56 PM Go to last post
  41. T-test and Z-test won't work

    How can I solve this problem? X brand of batterys have a mean charge lasting time of 90 minutes and a standard deviation is 35 minutes but are not...

    Started by SN1987‎, 05-10-2006 10:30 PM
    • Replies: 1
    • Views: 2,726
    05-11-2006, 09:14 AM Go to last post
  42. appropiate post hoc test

    Hi May someone help me with this? I have done a 2 factor univariate ANOVA, although some of my data is not still normally distributed (Kolmogorov...

    Started by sirhoppel‎, 05-10-2006 02:58 PM
    • Replies: 1
    • Views: 3,306
    05-10-2006, 03:38 PM Go to last post
  43. Normal Distribution Curve

    I just want to make sure I am getting this right. 0.0<z<2.85 .5000-.4978 =.0022 so I would shade in to the right of the curve. -1.38<z<0...

    Started by summertigger‎, 01-22-2006 02:08 PM
    • Replies: 7
    • Views: 7,332
    05-10-2006, 11:24 AM Go to last post
  44. Angry Type 1 error

    10 10 Α= P(Type 1 error)= P(x≥6In=10, p1/3)= E C (1/3)x(2/3)^(10-6) X=6 x How...

    Started by elce‎, 05-09-2006 02:51 PM
    • Replies: 4
    • Views: 2,761
    05-09-2006, 08:09 PM Go to last post
  45. Psych Stats - Help with Review Q'z

    I just received a stats review sheet with tons of questions which I am suppose to do as exam review for my psych stats course and I have a few...

    Started by aptiva‎, 05-07-2006 09:59 PM
    • Replies: 3
    • Views: 3,859
    05-09-2006, 08:08 PM Go to last post
  46. When to use Z scores or t scores?

    Hi everyone, I have lots of trouble with Z scores and t scores........A lot of times we are given the standard deviation; however, the question...

    Started by jessicaf‎, 05-07-2006 11:12 PM
    • Replies: 3
    • Views: 67,029
    05-09-2006, 06:35 PM Go to last post
  47. Two Sample T-Test With Unequal Variables

    I need to perform an independent samples t-test with unequal variables on these two sample sets. There are 30 samples in each. So far, I've come up...

    Started by graham_ashe‎, 05-09-2006 07:08 AM
    • Replies: 3
    • Views: 3,975
    05-09-2006, 10:29 AM Go to last post
  48. Unhappy Kurtosis

    Hi! In LISREL, which values are we to use when discussing kurtosis, z-values or statistical values? Also, what are the difference between them? ...

    Started by Erlend‎, 05-09-2006 04:50 AM
    • Replies: 0
    • Views: 3,298
    05-09-2006, 04:50 AM Go to last post
  49. Help - questions re: Empirical Rule/Chebyshev

    Hello: Does anyone know how to approach these problems? Any help would be greatly appreciated. The mean IQ of 200 patients in a psychiatric...

    Started by skhan‎, 05-06-2006 05:12 PM
    • Replies: 5
    • Views: 8,412
    05-08-2006, 08:34 AM Go to last post
  50. ANOVA help!

    Can anyone help with the analyses of the ANOVA output from SPSS. My thesis ihas a two tailed hypothesis and the ANOVA has produced the F values and...

    Started by jenny‎, 05-07-2006 07:21 AM
    • Replies: 1
    • Views: 1,966
    05-07-2006, 08:14 AM Go to last post
  51. Frequency Distribution & Polygons

    Hi there, I just started a course in stats for the behavioral sciences, and I'm having trouble with one of my assignments. The assignment is to...

    Started by Mira‎, 05-06-2006 01:23 PM
    • Replies: 2
    • Views: 2,082
    05-06-2006, 04:39 PM Go to last post
  52. Distribution NOT normal :-(

    I am conducting a repeated measure ANOVA and am testing the assumptions. My histograms are not showing a normal distribution for 2 of the 3...

    Started by maddyhamiltonuk‎, 05-06-2006 09:07 AM
    • Replies: 1
    • Views: 1,855
    05-06-2006, 01:39 PM Go to last post
  53. How to determine whether it is a good sample group and others

    Hello, I have some questions. I am going to collect 60 samples for my study. The samples' moisture contents are between 20 - 80 % 1. What...

    Started by snoopy123ng‎, 05-04-2006 02:03 PM
    • Replies: 1
    • Views: 1,485
    05-04-2006, 02:38 PM Go to last post
  54. Help with simple Confidence Interval Q

    I just don't understand how to do these, I'm sure they are pretty simple. Any help would be greatly appreciated. A random sample of 120 passengers...

    Started by DanCorb‎, 04-26-2006 03:02 PM
    • Replies: 7
    • Views: 2,319
    05-04-2006, 01:24 PM Go to last post
  55. Fischer Table?

    Hello all! I am currently working on a paper in finance. I have lost my statistics book. I would like to have a website with a Fischer table or...

    Started by Cedos‎, 04-24-2006 12:05 PM
    • Replies: 7
    • Views: 2,830
    05-04-2006, 12:10 PM Go to last post
  56. Unhappy Zscores and grouped data.

    Hi, I have a set of data in the form of a frequency distribution. I have the class sizes and the corresponding frequencies but no access to the...

    Started by mjc‎, 05-03-2006 04:44 PM
    • Replies: 3
    • Views: 2,683
    05-04-2006, 10:17 AM Go to last post
  57. Z-scores or mean +/- 2 std rule

    Given this dataset... 20010930 638,101 20011231 540,155 20020331 702,649 20020630 950,992 20020930 642,489 20021231 670,363 20030331 965,436...

    Started by Anusha‎, 05-02-2006 02:10 PM
    • Replies: 3
    • Views: 3,073
    05-02-2006, 04:53 PM Go to last post
  58. Analysis of correctness of answers

    Hi! I have another question. My participants had to perform 32 tasks (8 tasks in all four conditions), and now I want to analyse whether there are...

    Started by Janka‎, 05-02-2006 03:23 AM
    • Replies: 1
    • Views: 2,124
    05-02-2006, 11:06 AM Go to last post
  59. how large the sample size should be?

    Hi, I'm measuring electrical data from a clock generator and needs to know the std. dev. of period times (or frequency) for the lab report. I...

    Started by mhoresh‎, 04-30-2006 01:04 AM
    • Replies: 2
    • Views: 2,482
    05-01-2006, 02:33 AM Go to last post
  60. Nominal/Ordinal scale variables and analysis

    Hi, I’m a student in need of some help. I have developed a questionnaire with Likert type scales to measure the attitudes of employees in relation to...

    Started by Roger‎, 04-30-2006 01:02 PM
    • Replies: 1
    • Views: 6,314
    04-30-2006, 01:40 PM Go to last post

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