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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: 196,556
    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: 66,614
    09-30-2005, 09:44 AM Go to last post
  1. Confidence Interval: Adjusted Wald Method

    If I am conducting an experiment on 10 people and all 10 performed a task successfully, I want to know how to determine the confidence interval. I...

    Started by erand‎, 12-12-2006 12:11 PM
    • Replies: 4
    • Views: 16,725
    12-12-2006, 04:59 PM Go to last post
  2. How to calculate log mean standard deviation of two numbers?

    I have a journal paper which says they calculated coefficient of variations based on log mean average (LMA) values. Now, I know that log mean average...

    Started by kpj‎, 12-12-2006 02:14 PM
    • Replies: 0
    • Views: 4,547
    12-12-2006, 02:14 PM Go to last post
  3. Desparately need help

    I have a stat problem that I need to get in by the end of the day and I have no clue how to start it! Here's the problem: During one of the...

    Started by tobby‎, 12-12-2006 02:06 PM
    • Replies: 0
    • Views: 2,218
    12-12-2006, 02:06 PM Go to last post
  4. Point me in the right direction?

    Hi all, this is my first post here, so if I'm out of line or in the wrong spot, just let me know. Anyway, I've got a problem I could use some...

    Started by revolutiondeathsquad‎, 12-08-2006 07:10 PM
    • Replies: 4
    • Views: 2,629
    12-12-2006, 02:01 PM Go to last post
  5. Group differences help

    I am using a chi-square test to look for group differences in assessment use between four organizations bound by ethics codes. Some of the...

    Started by hstanbridge‎, 12-12-2006 01:48 PM
    • Replies: 0
    • Views: 1,868
    12-12-2006, 01:48 PM Go to last post
  6. Smile determining mean... help?

    Im looking for the mean wage per employee per hour. info is as follows. hourly wage numbr of employees $4.-4.50 ...

    Started by mrsjar‎, 12-09-2006 06:50 PM
    • Replies: 6
    • Views: 2,670
    12-12-2006, 01:44 PM Go to last post
  7. can anyone explain to me how to find p value from a printout?

    I'm studying for my final and just can't seem to find this in the text. If anyone could help out that would be great. here is a sample problem ...

    Started by sinful‎, 12-08-2006 07:40 PM
    • Replies: 2
    • Views: 5,021
    12-12-2006, 01:29 PM Go to last post
  8. Frejection region using T?

    not sure I understand this and any help would be great. One-Sample T test for VCR_price Null Hypothesis: MU = 215 Alternative hyp: MU > 215...

    Started by sinful‎, 12-10-2006 05:08 PM
    • Replies: 1
    • Views: 2,154
    12-12-2006, 01:20 PM Go to last post
  9. Do I have this right???

    Here's the question... The nicotine content in cigarettes of a certain brand is normally distributed with a mean and a standard deviation σ = 0.1....

    Started by Mathmess_2006‎, 12-08-2006 04:45 PM
    • Replies: 2
    • Views: 2,832
    12-12-2006, 01:16 PM Go to last post
  10. Help Me Please On The Normal Distribution!

    I CAN'T DO IT TO SAVE MY LIFE!: The random varialbe x has the discrete uniform distribution over the set of consecutive intergers {-7, -6... 10}...

    Started by Senoritaaa‎, 12-11-2006 09:21 PM
    • Replies: 1
    • Views: 1,847
    12-12-2006, 01:03 PM Go to last post
  11. Statistics question

    Can someone help with these questions: 4. In a survey, some of the questions concern sensitive issues (e.g., income, drug use, sexual...

    Started by Andrey Ivanov‎, 12-11-2006 03:37 PM
    • Replies: 2
    • Views: 2,612
    12-12-2006, 12:45 PM Go to last post
  12. ANCOVA Clarification

    Hi Everyone, I'm doing simple effects analyses in SPSS with two IVs and a Covariate, by splitting the file for my first IV. I see...

    Started by MdmeBtrfly‎, 12-11-2006 04:50 PM
    • Replies: 0
    • Views: 1,833
    12-11-2006, 04:50 PM Go to last post
  13. Quartile Calculations

    What is the correct way to calculate the quartiles? I know that it is more than just taking 25%, 50%, and 75%, but I don't recall the exact formula....

    Started by jamesstaylor‎, 12-11-2006 04:44 PM
    • Replies: 0
    • Views: 3,562
    12-11-2006, 04:44 PM Go to last post
  14. Please Help! (Sampling Distributions)

    I'm struggling with these two problems, i'll really appreciate any help, thanks in advance = ) 1) Obtain the probablility, by counting, of each...

    Started by Eulia‎, 12-08-2006 01:21 AM
    • Replies: 1
    • Views: 2,867
    12-11-2006, 01:00 AM Go to last post
  15. Regression Help

    Hi everyone, Can someone help me with this problem? Is it potentially problematic to collect data in small groups of 3-6 people? What is the...

    Started by 12345‎, 12-10-2006 06:13 PM
    • Replies: 0
    • Views: 1,870
    12-10-2006, 06:13 PM Go to last post
  16. Two way or one way ANOVA

    Subject No. Control Placebo Red Bull 1 29.9 28.8 29.56 2 28.5 29.94 28.36 3 34.92 35.41 34.9 4 31.91 31.6 31.42 5 34.92 34.8 34.04...

    Started by shudntbhere‎, 12-10-2006 02:41 PM
    • Replies: 3
    • Views: 2,320
    12-10-2006, 03:46 PM Go to last post
  17. Trend Analysis Question

    Hi There, I have a very quick question about trend analysis. I have a data set where there's two IVs: Drug and Task. Both variables...

    Started by MdmeBtrfly‎, 12-10-2006 01:21 PM
    • Replies: 1
    • Views: 3,289
    12-10-2006, 02:22 PM Go to last post
  18. End of semester assignment

    4. According to the American Psychological Association, members with a doctorate and a full-time teaching appointment earn, on average, $51,500 per...

    Started by ashe‎, 12-08-2006 07:22 PM
    • Replies: 0
    • Views: 1,671
    12-08-2006, 07:22 PM Go to last post
  19. errors

    never mind

    Started by H146‎, 12-08-2006 07:00 AM
    • Replies: 0
    • Views: 1,948
    12-08-2006, 07:00 AM Go to last post
  20. Plot Overlapping Values Software

    Hello, I wanted to ask if you know any charting software which can give weight to elements on a chart when two or more variables overlap? Ideally...

    Started by zealot‎, 12-08-2006 04:09 AM
    • Replies: 0
    • Views: 1,779
    12-08-2006, 04:09 AM Go to last post
  21. multiple questionnaire item chi square?

    I have three questions: Question 1 I have a questionnaire (5 point Likert) and I want to compare student responses to 4 items. The 4 items...

    Started by ehb23‎, 12-07-2006 07:28 PM
    • Replies: 2
    • Views: 4,515
    12-07-2006, 11:12 PM Go to last post
  22. Where do i start?

    I am unsure where to begin on this problem and what formulas to use. here is the problem: the chamber of commerce of clarkston, wa was...

    Started by BASSHZ‎, 12-07-2006 01:08 PM
    • Replies: 3
    • Views: 2,772
    12-07-2006, 08:42 PM Go to last post
  23. pls tell me if im correct with this answer

    A medical researcher wishes to determine whether there is a difference in the mean systolic blood pressure of 40-year-old males and females. To...

    Started by sweetx‎, 12-06-2006 09:15 PM
    • Replies: 1
    • Views: 2,257
    12-07-2006, 11:49 AM Go to last post
  24. level of significant. pls tell me if im correct

    A training program for the operation of a piece of diagnostic equipment usually takes an average of 40 hours to complete. A new method of training...

    Started by sweetx‎, 12-06-2006 08:53 PM
    • Replies: 1
    • Views: 2,174
    12-07-2006, 07:59 AM Go to last post
  25. Project Help

    Hey all, I'm trying to determine how best to do a 95% confidence interval and a standard deviation around a best fit line. In this example, I...

    Started by covitz‎, 12-06-2006 02:14 PM
    • Replies: 0
    • Views: 2,074
    12-06-2006, 02:14 PM Go to last post
  26. Regression Equation

    Hi there! I've got an equation and I don't even know where to start! The following table shows the body weight and gestation period of 12...

    Started by Mathmess_2006‎, 12-06-2006 11:01 AM
    • Replies: 2
    • Views: 2,762
    12-06-2006, 01:05 PM Go to last post
  27. Bayes inference for comparing stock portfolios

    I am working on an optimization problem to figure out which stock portfolio out of a large set of possible portfolios has the highest Sharpe ratio...

    Started by nradov‎, 12-06-2006 03:07 AM
    • Replies: 0
    • Views: 1,750
    12-06-2006, 03:07 AM Go to last post
  28. Unhappy standard error from the mean - HELP!

    I have all my standard error results but i do not have any idea how to interpret them... e.g. data set 1025 978 1332 mean = 1111.7...

    Started by scott79‎, 12-05-2006 09:25 PM
    • Replies: 0
    • Views: 1,793
    12-05-2006, 09:25 PM Go to last post
  29. Chi2 test

    Hi! I have a problem with this test. We had to write report on prevalence of infected snails at two seasides and base it on Chi2 test...

    Started by Ania‎, 12-05-2006 12:25 PM
    • Replies: 2
    • Views: 2,355
    12-05-2006, 04:05 PM Go to last post
  30. Weak statistician here

    We recently implemented a smoking ban and I am doing a paper on how it has affected bar/restaurant revenue. I surveyed 3 bars or restaurants in a...

    Started by chrisb‎, 12-04-2006 11:48 AM
    • Replies: 2
    • Views: 2,184
    12-05-2006, 10:20 AM Go to last post
  31. Question Binomial random variable help

    If X = a binomial random variable with parameters n and p, with 0<p<1 How do I show that P = P Also, how do I prove that as k goes from 0 to n,...

    Started by abe_cooldude‎, 12-02-2006 10:07 PM
    • Replies: 1
    • Views: 3,022
    12-04-2006, 07:29 PM Go to last post
  32. Lightbulb Help Pleasee

    I. In a certain type of conspiracy, the probability of a conspirator "talking" is 0.05, and the conspiracy will be considered "blown open" if at...

    Started by collegegrl1988‎, 12-04-2006 04:32 PM
    • Replies: 1
    • Views: 1,790
    12-04-2006, 07:07 PM Go to last post
  33. Lightbulb Homework Help

    :shakehead Hi my name is denise and I need a little help with these two problems.:rolleyes: Find the P-value for t greater than or less than...

    Started by denise‎, 12-04-2006 11:19 AM
    • Replies: 1
    • Views: 6,490
    12-04-2006, 04:27 PM Go to last post
  34. Hypothesis test for population variance

    I have a sample of 8 values, and need to test the null hypothesis sigma=25 against the alternative, sigma>25, where sigma is the population S.D....

    Started by naivesincerity‎, 12-04-2006 07:45 AM
    • Replies: 2
    • Views: 2,458
    12-04-2006, 08:48 AM Go to last post
  35. coureswork help please

    can someone please tell me what does a higher standard deviation mean? for example the suns standard deviation is 2 and the mirrors is 3 aswell what...

    Started by miten‎, 12-03-2006 11:14 AM
    • Replies: 1
    • Views: 1,620
    12-04-2006, 06:59 AM Go to last post
  36. Statistics and Pure Mathematics.

    Hi All. I very much passionate to build a bridge between some concepts of Statistics and Mathematics(in particular Pure Mathematics). Is there a...

    Started by satya99999‎, 12-04-2006 03:24 AM
    • Replies: 0
    • Views: 2,223
    12-04-2006, 03:24 AM Go to last post
  37. Basic question about correlation

    I'm trying to build an econometric model and have a basic question: Suppose corr(X,Y)=0.5 and corr(X,Z)=0.5, where X, Y, and Z are RVs. Is the...

    Started by EastCoastDoctoral‎, 11-30-2006 09:19 AM
    • Replies: 1
    • Views: 1,926
    12-04-2006, 01:08 AM Go to last post
  38. problem with project, help please

    whats up everyone? I'm stumped on this question in my project. I have the printout but have no idea where to begin to answer this question. ...

    Started by sinful‎, 12-03-2006 09:56 PM
    • Replies: 3
    • Views: 2,053
    12-03-2006, 11:38 PM Go to last post
  39. Help With Homework Problem Please

    Hi, I've got this question that I'm unsure about how to approach. I was wondering if anyone could give me a hand or steer me in the right direction....

    Started by KnifeRun‎, 12-02-2006 08:54 PM
    • Replies: 2
    • Views: 2,297
    12-03-2006, 09:29 PM Go to last post
  40. Uncertainty & confidence for pass/fail.

    Say I am testing a single cylinder gasoline engine. Counter1 counts number of times a spark is sent to the cylinder. Counter2 counts number of...

    Started by Barry Kaufman‎, 12-03-2006 07:42 PM
    • Replies: 0
    • Views: 2,157
    12-03-2006, 07:42 PM Go to last post
  41. Can anyone help me?

    I have this statistics and inference worksheet that i cant get through. If anyone could email me i can email you the worksheet if you could help me. ...

    Started by hans3n9‎, 12-03-2006 05:12 PM
    • Replies: 0
    • Views: 1,618
    12-03-2006, 05:12 PM Go to last post
  42. Help with a project, not sure where to start >o<

    Hi, I took a survey in which the data collected was non-numerical. For example, for most questions the options were either yes/no or...

    Started by Shiyume‎, 12-03-2006 04:16 PM
    • Replies: 2
    • Views: 1,948
    12-03-2006, 05:10 PM Go to last post
  43. Delphi study / 9 point Likert scales

    We are conducting a Delphi study. Each statement in our questionnaire is scored on a nine point likert scale ranging from 1(strongly disagree) to...

    Started by veena‎, 12-02-2006 12:14 PM
    • Replies: 3
    • Views: 10,639
    12-02-2006, 03:53 PM Go to last post
  44. Which test ?

    Hi guys, I'm glad to find your site on the nest cause i have some statistical issues that a dumb doctor as me without a vast statiscal training...

    Started by Jannis94‎, 12-02-2006 10:14 AM
    • Replies: 0
    • Views: 2,040
    12-02-2006, 10:14 AM Go to last post
  45. Question How to test a moderator, with ordinal variables-newbie

    Hello! I would appreciated if someone can help me, I'm a newbie in Statistics and research analyses. My questions are: - How do I test a...

    Started by soeka‎, 12-01-2006 09:55 AM
    • Replies: 1
    • Views: 4,460
    12-01-2006, 10:51 PM Go to last post
  46. 3SD Points

    Hi Guys, Glad I found you, i am needing some advice. I havent used stats in I dont know how long but have been asked to provide a graph to 3SD. ...

    Started by geemacd‎, 11-14-2006 10:40 AM
    • Replies: 6
    • Views: 3,926
    12-01-2006, 11:34 AM Go to last post
  47. Interval estimation for a population proportion

    For extra credit (5 points I desperately need) I have to solve the attached for P. My humble beginnings on this problem brought about an "oh boy"...

    Started by kad‎, 11-30-2006 02:47 PM
    • Replies: 0
    • Views: 2,675
    11-30-2006, 02:47 PM Go to last post
  48. Power in regression studies

    Hi, can someone help me with an idiots guide to calculating power for a study using linear regression. I need power at .05 level and i have one IV,...

    Started by Zzzz‎, 11-30-2006 08:37 AM
    • Replies: 0
    • Views: 1,842
    11-30-2006, 08:37 AM Go to last post
  49. Regressions

    Hello All, I've been working all day and night gathering information for a presentation that I have tomorrow. My presentation deals with the...

    Started by troubledstudent‎, 11-28-2006 06:21 AM
    • Replies: 3
    • Views: 2,841
    11-30-2006, 08:35 AM Go to last post
  50. Question Life Expectancy Map- Misleading?

    Hello, I am having some trouble looking at ths map and finding out what is misleading about it. Any input would be great!

    Started by helpplease‎, 11-30-2006 12:39 AM
    • Replies: 2
    • Views: 2,904
    11-30-2006, 01:35 AM Go to last post
  51. clustering test

    Hi, I have many data points, which each point is a 2D coordinate. I need to find if these data points are significantly clustered or randomly...

    Started by german‎, 11-29-2006 01:56 AM
    • Replies: 1
    • Views: 3,211
    11-29-2006, 09:00 PM Go to last post
  52. mean and standard deviation

    in a problem that gives you the mean and standard deviation for each variable, can you add the means together to get the total mean or standard...

    Started by b.unique‎, 11-29-2006 03:34 PM
    • Replies: 1
    • Views: 3,145
    11-29-2006, 06:49 PM Go to last post
  53. sampling

    If say an electricity company operates in 3 regions - A, B, C. A contains 40000, 80000, 80000 homes respectively. to company wants to estimate the...

    Started by piklas‎, 11-29-2006 12:01 PM
    • Replies: 5
    • Views: 3,015
    11-29-2006, 02:02 PM Go to last post
  54. Multivaiant Variances, need some direction.

    Here is the question from a practice test we got today in AP Stats, 3. Cans of soft drinks cost $.30 in a certain vending machine. What is the...

    Started by MiturBinIzdrti‎, 11-28-2006 05:40 PM
    • Replies: 1
    • Views: 4,972
    11-29-2006, 01:47 PM Go to last post
  55. practice exam question

    My teacher posted a practice exam, but we weren't able to go over it all in class. I was wondering if someone could help me with this problem. ...

    Started by B40Dogs‎, 11-28-2006 07:28 PM
    • Replies: 0
    • Views: 2,301
    11-28-2006, 07:28 PM Go to last post
  56. Homework help...please

    Would you mind checking my answers to these questions? Question: A researcher wants an answer to the following question: Does the correlation...

    Started by Elizabeth07‎, 11-28-2006 06:37 PM
    • Replies: 0
    • Views: 1,892
    11-28-2006, 06:37 PM Go to last post
  57. big study, little idea

    I am trying to set up a statistical design for an experiment I am runnning in a greenhouse on defense mechanisms of plants to herbivory. ...

    Started by japurd04‎, 11-28-2006 10:35 AM
    • Replies: 0
    • Views: 1,652
    11-28-2006, 10:35 AM Go to last post
  58. Chi square independence contigency table

    The dean of instruction wanted to determine if the grade distribution was independent of the subject matter taught. The following table was...

    Started by fantasydawn‎, 11-27-2006 09:28 PM
    • Replies: 2
    • Views: 2,477
    11-28-2006, 12:15 AM Go to last post
  59. Chi test distribution for goodness of fit, I think

    Can someone please review this problem and let me know if I've chosen the right analysis? An elementary teacher is supposed to spend an equal amount...

    Started by fantasydawn‎, 11-27-2006 08:18 PM
    • Replies: 2
    • Views: 2,011
    11-28-2006, 12:11 AM Go to last post
  60. Chi Square and Point Estimator

    I have a quick question that I am lost on. I have a problem that included 16 random numbers of 13,11,25,3,16,7,14,10,13,22,16,5,18,24,21,and 16. ...

    Started by crazytrain‎, 11-27-2006 10:43 PM
    • Replies: 3
    • Views: 2,395
    11-27-2006, 11:44 PM Go to last post

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