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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: 197,128
    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: 66,938
    09-30-2005, 09:44 AM Go to last post
  1. T-Test Question

    Hi Everyone, I'm 98% done with my statistics homework, and I'm just stuck on one issue. To make a long story short, I was asked to do...

    Started by MdmeBtrfly‎, 10-07-2006 02:45 PM
    • Replies: 1
    • Views: 2,437
    10-07-2006, 04:00 PM Go to last post
  2. Which Statistics To Use?

    I am looking at the effects of 4 different driving training methods on 4 different groups of people. My dependent variables are thier number of...

    Started by lstanley‎, 10-06-2006 06:44 PM
    • Replies: 3
    • Views: 2,203
    10-07-2006, 12:46 PM Go to last post
  3. ANOVA Advice

    Hi I am trying to do some tests and I need some advice. I am comparing scores on two different questionnaires given to around 1000 people. The issue...

    Started by rlynas‎, 10-05-2006 10:07 PM
    • Replies: 1
    • Views: 2,365
    10-07-2006, 08:45 AM Go to last post
  4. Needing some assistance with this problem (true proportion)

    Here's the problem: A U.S. Travel Data Center's survey of 1500 adults found taht 42% of respondents stated that they favor historical sites as...

    Started by adegrasse‎, 10-06-2006 08:07 PM
    • Replies: 1
    • Views: 5,903
    10-07-2006, 08:41 AM Go to last post
  5. Logistic Regression

    I am a distance learning student with a project on hand. I am new to stats and would be seeking help from colleagues. Thanks I am confused about two...

    Started by dave‎, 10-06-2006 06:52 AM
    • Replies: 0
    • Views: 2,690
    10-06-2006, 06:52 AM Go to last post
  6. Question Please Help...Normal Distribution Probabilities

    HOw do you solve a problem like this one. Let X~N(3,4) P ...it should be greater than or equal to. Thanks.

    Started by karaeileen‎, 10-03-2006 08:21 PM
    • Replies: 2
    • Views: 2,387
    10-06-2006, 01:44 AM Go to last post
  7. Post More On Sampling Distributions.....

    Okay so I started on this one too....but once again I don't know if my method is correct.... Suppose that the distribution of all male students on...

    Started by reretriple2‎, 10-05-2006 06:06 PM
    • Replies: 1
    • Views: 3,866
    10-05-2006, 06:51 PM Go to last post
  8. Post Sampling Distributions....

    I am sorry....but I have no idea how to go about setting this problem up.... Heights of male students. To estimate the mean height of u...

    Started by reretriple2‎, 10-05-2006 03:30 PM
    • Replies: 1
    • Views: 5,058
    10-05-2006, 05:34 PM Go to last post
  9. Comparing Median and Median Absolute Deviation (MAD)

    Hi, I have 3 focus groups each consisting of 4 people. They all rated a list of quality indicators (ratings were between 1 to 9, 1 being less...

    Started by sushmaja‎, 10-05-2006 03:07 PM
    • Replies: 1
    • Views: 8,166
    10-05-2006, 05:32 PM Go to last post
  10. Red face what is the purpose in plotting moving average??

    please help.

    Started by ionc‎, 10-05-2006 04:33 PM
    • Replies: 1
    • Views: 8,047
    10-05-2006, 05:25 PM Go to last post
  11. Euclidean Distance as measure of homogeneity for K-means Cluster analysis

    Hi, Currently I'm performing K-means cluster analysis. To figure out how homogeneous the respondents within my clusters are, I calculate the...

    Started by Pieterg‎, 10-05-2006 10:32 AM
    • Replies: 0
    • Views: 4,586
    10-05-2006, 10:32 AM Go to last post
  12. item to total correlation?

    I want to purify a scale, so I want to test for three things: Doing a principal components EFA I assess: a. Internal consistency. I will use...

    Started by deram‎, 10-04-2006 10:33 PM
    • Replies: 0
    • Views: 5,243
    10-04-2006, 10:33 PM Go to last post
  13. Help finding IRR

    I have a problem that I am doing for a basic Engineering statistics class that goes like this: You take out a loan to pay the remaining 15,000 on...

    Started by sirrion13‎, 10-04-2006 03:25 AM
    • Replies: 1
    • Views: 4,373
    10-04-2006, 10:05 AM Go to last post
  14. Simple effects analyses not so simple!

    Need some help as to what way should the simple effects of an age_category (young, old) x condirtion (A, B, C, D, E) interaction be analysied for the...

    Started by statie‎, 10-04-2006 07:11 AM
    • Replies: 3
    • Views: 4,534
    10-04-2006, 10:00 AM Go to last post
  15. control charts-type I error

    My control chart has a type I error rate of 0.0027 (3 standard deviations). I am comparing 5 months of signals to my baseline UCL. Am I inflating...

    Started by statgirl26‎, 10-03-2006 04:31 PM
    • Replies: 1
    • Views: 2,909
    10-03-2006, 07:45 PM Go to last post
  16. Relationships between variables

    Hello, Our current research work involves analysis of relationships between variables based on historical data. In general, the dataset is in the...

    Started by wstach‎, 10-03-2006 02:19 PM
    • Replies: 0
    • Views: 2,032
    10-03-2006, 02:19 PM Go to last post
  17. How to combine several data sets

    I have hourly logs of web server response times that I need to combine into a daily summary. I don't have the original source data or I would just...

    Started by mr_camp‎, 10-03-2006 10:23 AM
    • Replies: 3
    • Views: 5,698
    10-03-2006, 12:53 PM Go to last post
  18. Inferential/Descriptive Statistics?

    I cant figure out each of the following correct answer. (a)By examining the results of a statewide poll it was estimated that 52% of the...

    Started by statsstudent‎, 10-02-2006 07:32 PM
    • Replies: 1
    • Views: 2,567
    10-02-2006, 08:14 PM Go to last post
  19. ANOVA vs. MANOVA

    Can you provide a good example that can describe the differences between ANOVA vs. MANOVA? I know the primary differences is that MANOVA involves...

    Started by lstanley‎, 10-01-2006 04:03 PM
    • Replies: 1
    • Views: 3,337
    10-02-2006, 05:47 PM Go to last post
  20. Red face Stats Test?

    Hi there, Can you help me with what test to use in the following example situation: It is predicted that the driver training method "A"will...

    Started by lstanley‎, 10-01-2006 07:06 PM
    • Replies: 1
    • Views: 2,680
    10-02-2006, 05:46 PM Go to last post
  21. Cool Instructor rating versus performance

    Hello, I am trying to figure out the following problem: Let's say we have driving instructor teaching a group of students how to drive and along...

    Started by lstanley‎, 10-01-2006 07:00 PM
    • Replies: 1
    • Views: 2,031
    10-02-2006, 05:45 PM Go to last post
  22. Statistical test used

    We are testing 4 different training methods on a group of drivers and want to determine if there are any differences among the 4 methods. We are...

    Started by lstanley‎, 10-01-2006 08:03 PM
    • Replies: 1
    • Views: 2,125
    10-02-2006, 05:43 PM Go to last post
  23. Help Please!!

    1.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35, find P(X ≤ 1) 2.Given f(-1) = 0.15, f(1) = 0.29, f(3) = 0.21, and f(5) = 0.35,...

    Started by Leper Messiah‎, 10-01-2006 09:28 PM
    • Replies: 1
    • Views: 1,805
    10-02-2006, 05:41 PM Go to last post
  24. Level of Measurement?

    My current homework requires this.Im having some trouble with getting things in line. What category meaning (nominal, ordinal, interval, or ratio) do...

    Started by statsstudent‎, 10-02-2006 02:08 AM
    • Replies: 1
    • Views: 3,214
    10-02-2006, 05:38 PM Go to last post
  25. Question Interpret...?

    Hey, I'm trying to do this lab for my Stats Class but I'm a little confused. It says: "11. Calculate and interpert r and r^2 for the data." What...

    Started by RedFred2089‎, 10-01-2006 10:35 PM
    • Replies: 2
    • Views: 4,441
    10-02-2006, 05:36 PM Go to last post
  26. Thumbs up Assumptions of t-test

    Just a quick question (hopefully). Can I use a between-groups t-test (assuming unequal variances) if one of the two groups I'm comparing (but not the...

    Started by benambridge‎, 10-02-2006 06:51 AM
    • Replies: 1
    • Views: 3,307
    10-02-2006, 05:34 PM Go to last post
  27. Chi-Square Goodness of fit Test

    Hi, I would like to know the minimum number of times it is necessary to throw a dice to run a Chi-Square Goodness of fit Test (and get...

    Started by StatLearner‎, 09-26-2006 01:41 PM
    • Replies: 1
    • Views: 3,003
    10-02-2006, 01:38 PM Go to last post
  28. cointegration and dummy variable

    If we have a time series with shift dummies and test it for cointegration with another time series, do we have to include the dummies in the time...

    Started by Tzveta Iordanova‎, 10-02-2006 09:55 AM
    • Replies: 0
    • Views: 3,202
    10-02-2006, 09:55 AM Go to last post
  29. p-charts for complaint monitoring

    I am in a position where I am looking at complaints for different products. It has been tradition to monitor the complaints using a modified p-chart...

    Started by statgirl26‎, 09-25-2006 03:32 PM
    • Replies: 6
    • Views: 3,466
    10-02-2006, 08:17 AM Go to last post
  30. Question HELP! Which stat test do I use???

    I am currently working on my Masters thesis and am having some difficulties with what test to use for my data. I am comparing intelligence tests and...

    Started by stacyrobinson‎, 09-30-2006 06:54 PM
    • Replies: 5
    • Views: 3,998
    10-01-2006, 09:21 PM Go to last post
  31. Which Statistics Test Do I Use?

    We are giving 400 people a survey asking them the following about our phone services, what statistical test do we run for each of these? 1.) As...

    Started by lstanley‎, 09-22-2006 07:55 AM
    • Replies: 5
    • Views: 2,747
    10-01-2006, 01:13 PM Go to last post
  32. Converting Mean to Z Value

    I have a few problems to figure out where I need to convert x intervals to a z interval. I used this format: z = x-u/o. I became confused where...

    Started by joyce72266‎, 09-30-2006 04:15 PM
    • Replies: 1
    • Views: 3,000
    10-01-2006, 12:55 PM Go to last post
  33. average of two means from the same data?

    I've been given two means from the same data set (split into people who said yes and no) from this i have to find the mean of the total of the data....

    Started by twitchy‎, 09-30-2006 02:05 AM
    • Replies: 2
    • Views: 10,166
    10-01-2006, 08:19 AM Go to last post
  34. new to linear programming

    hello all i just started to learn about linear programming and solving and boy i got a long problem to deal with..i am not asking anybody to do it...

    Started by rockerdude420‎, 09-30-2006 08:53 AM
    • Replies: 0
    • Views: 5,762
    09-30-2006, 08:53 AM Go to last post
  35. Question power analysis

    i'm helping out with the power analysis for a study that is using 6 independent variables and one dependent variable. orginially, i suggested a...

    Started by teanabeana‎, 09-25-2006 01:43 PM
    • Replies: 7
    • Views: 3,908
    09-29-2006, 11:10 AM Go to last post
  36. Average of Standard Deviation?

    I am hoping this is an easy one. I have employees that work at different stores on different days of the week. My employees have different start...

    Started by GustoTangerine‎, 09-28-2006 09:05 AM
    • Replies: 1
    • Views: 3,592
    09-29-2006, 10:11 AM Go to last post
  37. Repeatability

    Hi Folks, I am a newbie in stats. I had a couple of questions which I would really appreciate if you could take the time to answer. I want to...

    Started by thewildleo‎, 09-28-2006 11:58 PM
    • Replies: 0
    • Views: 4,899
    09-28-2006, 11:58 PM Go to last post
  38. Anyone know how to do Correlation and Regression?

    I'm working on problems dealing with correlation and regression. It tells me that I can use the TI-83 calculator and punch in paired data lists L1...

    Started by BigNiner19‎, 09-28-2006 06:33 PM
    • Replies: 0
    • Views: 3,404
    09-28-2006, 06:33 PM Go to last post
  39. interaction effect?

    how to tell whether from the attached pdf below 1)there is relationship between between average number of purchases per quarter with the...

    Started by wanye‎, 09-28-2006 10:24 AM
    • Replies: 0
    • Views: 2,055
    09-28-2006, 10:24 AM Go to last post
  40. probably an easy problem!!

    I have a somewhat simple statistical problem, but i'm not sure if I'm doing this right. The mean and standard deviation on a test were 50 and 20,...

    Started by Dolphins1544‎, 09-27-2006 09:17 AM
    • Replies: 1
    • Views: 2,357
    09-27-2006, 07:29 PM Go to last post
  41. help-logistic regression model

    i ran a logistic model with 6 variables. but lift is one 1.5 at top 5% scored target list. P-value for each variable is small, (0.000), i just don't...

    Started by lxm218‎, 09-27-2006 01:33 PM
    • Replies: 0
    • Views: 3,295
    09-27-2006, 01:33 PM Go to last post
  42. Normal distribution in the exponent

    In excel, if you raise the normal distribution to an exponent why do you get exponential growth? i.e. if e^0=1 then when you have S=Se^w, where ...

    Started by Liam Marcus‎, 09-27-2006 12:52 PM
    • Replies: 0
    • Views: 2,233
    09-27-2006, 12:52 PM Go to last post
  43. guidelines on doing a good statistic report ?

    Hi all, are there any links or samples of good statistic reports for reference? i need to prepare a statistic reports with a max of 8 pages(with...

    Started by wanye‎, 09-27-2006 11:06 AM
    • Replies: 0
    • Views: 2,409
    09-27-2006, 11:06 AM Go to last post
  44. Question t-test dependant sample

    If I want to compare means of one group pre and post intervention, does it matter if the follow up time was different for the pre intervention and...

    Started by sushmaja‎, 09-20-2006 05:24 PM
    • Replies: 4
    • Views: 4,033
    09-25-2006, 05:36 PM Go to last post
  45. Wink Food service satisfaction survey - 4 point Likert scale

    Good morning, This is my first posting... I am a dietitian with a master degree. I am doing research in Clientele satisfaction (i.e. quality of...

    Started by Isabelle‎, 09-25-2006 09:13 AM
    • Replies: 3
    • Views: 12,026
    09-25-2006, 02:40 PM Go to last post
  46. Question Linear Programming

    Hello, I have the following linear programming question: Company 1: maximize: z=3x1+4x2+6x3+x4 subject to: x1+x2 <= 500 x3+x4 <= 50 x1+x3 <=...

    Started by e. cools‎, 01-13-2006 05:52 AM
    • Replies: 1
    • Views: 6,088
    09-24-2006, 12:44 PM Go to last post
  47. Simple dice problem

    I shold know the answer to this but it's been many years.... I toss a dice 120 times. How do I calculate the probability of correctly guessing...

    Started by Michael Heap‎, 09-22-2006 01:09 PM
    • Replies: 1
    • Views: 2,670
    09-22-2006, 01:15 PM Go to last post
  48. Acceptable Pins

    Hello, I am drawing a complete blank for some reason on the second half of this problem. It is the age old acceptable pins problem. The mean is...

    Started by will‎, 09-21-2006 09:41 PM
    • Replies: 1
    • Views: 4,372
    09-22-2006, 01:06 PM Go to last post
  49. interaction effects in regression analysis

    hello all together, maybe someone could help me with this. I've conducted a regression analysis including an interaction term. as a result it...

    Started by leichtsinn‎, 09-20-2006 03:46 AM
    • Replies: 4
    • Views: 2,983
    09-22-2006, 07:25 AM Go to last post
  50. Index making

    Hi, I've been struggling with this one for months now: I've done a survey which tries to link objective to subjective data The project is...

    Started by Oechel‎, 09-21-2006 04:01 PM
    • Replies: 0
    • Views: 1,973
    09-21-2006, 04:01 PM Go to last post
  51. Discrete or Continuous

    Can someone please tell me if I got these right... The number of cups of coffee sold in a cafeteria during lunch = DISCRETE The cost of a...

    Started by JBM‎, 09-21-2006 01:00 PM
    • Replies: 1
    • Views: 5,669
    09-21-2006, 01:45 PM Go to last post
  52. Interaction Model

    Hi everyone! This is a really nice site, and i am glad for finding it in google. I want some help to run an interaction model. I have a...

    Started by knanopoulos‎, 09-21-2006 01:11 PM
    • Replies: 0
    • Views: 2,244
    09-21-2006, 01:11 PM Go to last post
  53. Sample size for regression equation?

    If I know what I want in terms of confidence level and interval, is there some rough way to gauge how large a sample size I need for an equation of...

    Started by CBedo‎, 09-19-2006 12:47 PM
    • Replies: 4
    • Views: 4,415
    09-21-2006, 06:57 AM Go to last post
  54. Floor Effects

    Hi! I want to compare two groups on an accuracy measure (measured as a %). I have assessed the ditribution of scores for each groups, and while...

    Started by Alsvartr‎, 09-20-2006 04:19 PM
    • Replies: 2
    • Views: 5,704
    09-21-2006, 05:13 AM Go to last post
  55. Which test to use?!

    Hi, I'm having to use nonparametric methods to analyse some data owing to an abnormal distribution which results from a disprortionate number of...

    Started by Rachelb‎, 09-20-2006 03:33 AM
    • Replies: 6
    • Views: 2,571
    09-20-2006, 02:01 PM Go to last post
  56. Question Central Limit Theorem ???

    Hi, I'm having trouble understanding this problem. Our professor gave the answer to study with, but I can't understand why the probabilities...

    Started by jena2007‎, 09-20-2006 12:49 PM
    • Replies: 1
    • Views: 3,889
    09-20-2006, 01:06 PM Go to last post
  57. Thoughts on appropriate comparison tool

    Greetings from a new joiner! Great forum! I had a question about analysis. I have a decent background in analysis, though have been "out of...

    Started by quadraphonic‎, 09-20-2006 11:20 AM
    • Replies: 4
    • Views: 3,411
    09-20-2006, 12:54 PM Go to last post
  58. Moved: a probability problem

    Started by mithrandil‎, 12-25-2006 09:46 PM
    • Replies: -
    • Views: -
    09-19-2006, 08:17 PM Go to last post
  59. sample size determination

    Sample size determination: Our database: There is a historical code preference from our customer. We like to give some credit to the customer who...

    Started by jimmy23‎, 09-19-2006 11:13 AM
    • Replies: 0
    • Views: 2,348
    09-19-2006, 11:13 AM Go to last post
  60. Which Tests are appropriate?

    I have created a survey where participants state their agreement with my statements on a 7 point likert scale. Also 3 category questions, eg their...

    Started by Free Soul‎, 09-17-2006 10:28 AM
    • Replies: 6
    • Views: 3,626
    09-19-2006, 09:31 AM Go to last post

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