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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: 197,273
    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: 67,035
    09-30-2005, 09:44 AM Go to last post
  1. Slope parameter info if intercept known?

    Consider the SLR y = b +mx + e Where the intercept b is known. a) Find least squares estimator of m for this model. b) What's the variance...

    Started by Anonymouse3‎, 02-14-2010 10:28 PM
    • Replies: 8
    • Views: 4,762
    08-11-2012, 09:22 PM Go to last post
  2. Help! Predict average Variation of commodity price for next year

    Hi All, I have data on the percentage variation of prices of commodity for the year 2011 (mentioned below) and would like to predict average price...

    Started by Arjun‎, 02-28-2012 12:36 AM
    • Replies: 8
    • Views: 2,663
    03-02-2012, 08:02 AM Go to last post
  3. type 1 and 2 error easy help please

    Lifetime of a certain type of batteries is said to be Normally distributed with a known standard deviation of 5 hours. The manufacturer claims that...

    Started by randy blythe‎, 03-05-2012 11:06 AM
    type 1 type 2 error
    • Replies: 8
    • Views: 3,072
    03-06-2012, 07:39 AM Go to last post
  4. Poisson Distribution problem again...

    My question is: When studying cesium 137, it is found that during the course of decay over 365 days 1,000,000 radioactive atoms are reduced to...

    Started by kelly g‎, 03-07-2012 01:45 PM
    • Replies: 8
    • Views: 5,559
    03-08-2012, 02:30 PM Go to last post
  5. Transforming two non-normal sets of data for 2 sample t-test?

    Hey all, Ok so I'm trying to compare the means of two sets of data using a 2-sample t-test. Unfortunately, both sets of data are non-normal. It...

    Started by Paintguru‎, 03-12-2012 02:08 PM
    • Replies: 8
    • Views: 3,206
    03-16-2012, 09:56 AM Go to last post
  6. Estimators from a Normal Distribution

    Hi everybody. I have a random variable X normally distributed with mean mu and variance sigma squared. I generate two independent sample T1 and T2...

    Started by luison‎, 04-27-2012 03:46 PM
    • Replies: 8
    • Views: 3,692
    05-02-2012, 05:37 PM Go to last post
  7. Exclamation Immediate help needed with sampling

    Don't need help anymore.

    Started by Fatima‎, 03-13-2012 06:53 PM
    • Replies: 8
    • Views: 2,253
    03-13-2012, 08:25 PM Go to last post
  8. Analysis of soil fertility - Looking for guidance/confirmation

    Hello, I have agreed to help a friend out with the data analysis for a major school project, with the caveat that I am no expert in statistics. It's...

    Started by goatnuck‎, 03-21-2012 02:26 PM
    • Replies: 8
    • Views: 1,849
    03-21-2012, 05:53 PM Go to last post
  9. Question use of the mann-whitney test

    Hi I work at a university and am getting conflicting opinions between our statisitican and reviewer for a journal that i have submitted a paper to. ...

    Started by Nicola66‎, 04-20-2012 09:21 AM
    • Replies: 8
    • Views: 6,063
    04-22-2012, 04:50 AM Go to last post
  10. Confused with Homoscedasticity, PCA & AHC

    Dear Colleagues, I need help with analysing my data. My data set consists of 66 different linear measurements taken per mouse skull. I have 66...

    Started by Seth Eiseb‎, 05-09-2012 10:56 AM
    • Replies: 8
    • Views: 2,998
    05-16-2012, 11:09 AM Go to last post
  11. Find Equation from SPSS syntax?

    Hi Does anyone know if there is a way to create the equation from the syntax used in SPSS? I know what I am doing, but haven't a clue about correct...

    Started by heather_s‎, 07-17-2012 02:53 AM
    • Replies: 8
    • Views: 3,227
    07-17-2012, 05:01 AM Go to last post
  12. Likert scale

    Hello all, I seriously need help on my research analysis. I am conducting a qualitative research with structured interviews i.e predetermined...

    Started by belushiiwuzere‎, 07-19-2012 03:16 PM
    likert scale analysis.
    • Replies: 8
    • Views: 4,980
    07-21-2012, 03:16 AM Go to last post
  13. Is a random sample from a random sample a random sample?

    Sorry for the confusing title. I have a population dataset with ~15million records from which I must produce a random sample of 100K records for a...

    Started by kurt batsche‎, 08-01-2012 12:39 PM
    random sample
    • Replies: 8
    • Views: 2,682
    08-01-2012, 04:56 PM Go to last post
  14. Running stats on geometric means data

    Hi All, I have never worked with geometric means before and I'm really confused on how to run statistics on the data, as stats run on arithmetic...

    Started by PHO_M‎, 08-03-2012 12:13 PM
    • Replies: 8
    • Views: 3,236
    08-07-2012, 12:44 PM Go to last post
  15. Is a paired T-test with one variable with all zero values valid?

    Hi forumites, I have come across this situation where all the measured values for one of the variables are zero and the other has values ranging...

    Started by jgpatil‎, 08-05-2012 07:31 PM
    • Replies: 8
    • Views: 7,089
    08-05-2012, 09:54 PM Go to last post
  16. [Relation of daily sales] Chi-Square, T-Test or Correlation?

    Hello, Which to use to test whether Monday sales and sales on the other days of the week are independent from each other. Case: A promotion...

    Started by kggunes‎, 09-13-2012 05:22 AM
    dependent
    • Replies: 8
    • Views: 1,473
    09-25-2012, 08:26 PM Go to last post
  17. Favorite beginner textbook?

    Sorry if this is repeat info; I am a newbie to the Forum. I did a quick search and did not see a similar question, so here goes: I am teaching a...

    Started by slccmh‎, 09-19-2012 09:18 AM
    • Replies: 8
    • Views: 1,768
    09-27-2012, 12:54 PM Go to last post
  18. Percentile of SAMPLE mean

    Can someone please explain to me how to work out the percentile of the sample mean (diff to confidence intervals which is pop mean) The Q is: ...

    Started by kstone‎, 09-19-2012 10:26 PM
    • Replies: 8
    • Views: 16,838
    09-20-2012, 04:52 AM Go to last post
  19. independent or paried t test?

    the Census bureue believe that recently the ethnic composotion of a certain city has changed. 5 years ago there were 40% Asian, 22% Caucasian, 8% AA,...

    Started by nyo‎, 09-24-2012 11:16 AM
    • Replies: 8
    • Views: 2,272
    09-24-2012, 01:05 PM Go to last post
  20. central limit theorem and mean

    Hi, I know that the central limit theorem states that as sample size increases the sampling distribution of the sample mean tends toward normal....

    Started by samiam99‎, 09-29-2012 06:47 PM
    • Replies: 8
    • Views: 2,024
    09-30-2012, 04:28 PM Go to last post
  21. Conditional Multivariate Probability

    So, I got this from my textbook and it makes sense: P_{Y|x}(y)= P(Y=y|X=x) = P_{X,Y}(x, y)/P_X(x) But I'm trying to apply it to this question...

    Started by oxycontiin‎, 11-04-2012 10:54 PM
    conditional, dice, multivariate, probability, problem
    • Replies: 8
    • Views: 3,445
    11-05-2012, 07:33 PM Go to last post
  22. Visualize and quantify factors that most contribute to customer decision

    To the Direct Marketing department I have to to visualize and quantify the factors that most contribute to a customer’s decision to buy any group of...

    Started by bgombas‎, 10-23-2012 05:58 AM
    factor analysis, spss
    • Replies: 8
    • Views: 1,463
    10-23-2012, 09:34 AM Go to last post
  23. Use of dummy in Plackett-Burmann screening

    I am trying to set up an experiment for optimizing medium composition for bacterial growth using the Plackett-Burman design. I am planning to do a...

    Started by Essen1‎, 10-23-2012 05:47 AM
    2-fractional factorial
    • Replies: 8
    • Views: 5,125
    08-13-2013, 12:55 AM Go to last post
  24. Anova or mixed model, and is non-orthogonality a problem?

    Hello, I am trying to test whether the following variables affect likelihood of visits by squirrels to feeding stations: Distance of feeder...

    Started by lkay‎, 11-08-2012 11:53 AM
    • Replies: 8
    • Views: 2,200
    11-11-2012, 05:31 PM Go to last post
  25. Kruskal Wallis/Dunn's test issue

    Apologies, I cannot find an answer to this on these boards... Anyway, first post... I have been asked to look at some stats by a colleague, and...

    Started by pnwright‎, 12-01-2012 05:16 AM
    • Replies: 8
    • Views: 14,161
    12-02-2012, 05:11 AM Go to last post
  26. Question Significance test for percentages

    Hi everyone I need to compare percentage composition of different groups and determine if groups significantly differ. Example: Election...

    Started by GeB‎, 12-04-2012 04:04 PM
    • Replies: 8
    • Views: 4,022
    12-05-2012, 05:22 PM Go to last post
  27. Likert scale analysis

    Hi. I have carried out a staff survey with about 30 questions grouped into a number of variables eg staff engagement, communication. I have done a...

    Started by crm‎, 12-08-2012 08:39 PM
    • Replies: 8
    • Views: 1,729
    12-11-2012, 05:51 PM Go to last post
  28. Standard Deviation of X Bar?

    The population standard deviation= 1.7078 n=40 What is the standard deviation of x bar? Help! I keep using the formula: standard deviation of...

    Started by smsmth10‎, 04-11-2013 04:32 PM
    • Replies: 8
    • Views: 5,384
    04-11-2013, 08:19 PM Go to last post
  29. Simple effects- multiple comparisons adjustments necessary?

    Hi guys, I cannot seem to figure out what the correct procedure is for simple effects analysis when decomposing interactions. So I have a...

    Started by Sunwin‎, 01-03-2013 07:27 AM
    adjustment, anova, multiple comparisons, significant interaction., simple effects
    • Replies: 8
    • Views: 2,491
    01-07-2013, 06:02 AM Go to last post
  30. interpreting a model after mean centering

    hello, I have to choose the best way to model the relationship between years' experience and time taken to master a new skill. The curve seems to...

    Started by gooner8‎, 01-09-2013 07:29 AM
    help please, multicollinearity, regression
    • Replies: 8
    • Views: 2,424
    01-09-2013, 01:26 PM Go to last post
  31. DOE for rock paper scissor analysis - suggestions for analysis needed!

    Hi, I am in a design of experiments class at my university. We are analyzing rock-paper-scissor strategies and results among females and males on...

    Started by domesplitter69‎, 03-05-2013 03:41 PM
    doe, hypothesis test
    • Replies: 8
    • Views: 1,704
    03-05-2013, 06:02 PM Go to last post
  32. mixed effect: what should be modelled as random effect?

    I'm trying to figure out what should be modelled as the random effect in a mixed effects model. I've made this toy data which shows exam scores of...

    Started by Layo909‎, 04-17-2013 10:59 AM
    • Replies: 8
    • Views: 1,668
    04-24-2013, 03:30 PM Go to last post
  33. Can i do a t-test after Tukey post hoc?

    Hello just wondering if this is acceptable or whether it's just gonna cause a type-1 error. I have used One-way ANOVA and then Tukey post hoc to...

    Started by Alice1436‎, 04-13-2013 05:59 AM
    • Replies: 8
    • Views: 2,855
    04-14-2013, 06:33 AM Go to last post
  34. [SOLVED] Increase variability

    I have the need to take a variable that is normally distributed around 0 and the lower and upper bound is at -1 and 1. I need a transformation to...

    Started by trinker‎, 02-05-2013 04:10 PM
    transformation, variability
    • Replies: 8
    • Views: 1,958
    02-05-2013, 09:30 PM Go to last post
  35. statistical tests

    Hi. I need you help, please!!!!! I have some data like this id a c t 1 1 1 1 2 1 1 0

    Started by slavia‎, 03-13-2013 06:43 AM
    • Replies: 8
    • Views: 1,559
    03-13-2013, 11:54 AM Go to last post
  36. Finding the p-value for two samples which are not normally distributed.

    Hello, I am doing medical research and I have gathered data for two groups of patients with different characteristics. The data for each of the...

    Started by uwold‎, 02-20-2013 04:40 PM
    p-value
    • Replies: 8
    • Views: 2,548
    02-21-2013, 10:01 PM Go to last post
  37. Stats measure to describe difference between two data sets?

    Hi folks, Behold these two graphs of the S&P 500 index, one from 1950-1997 & the other from 1998 to the present. (The y-axis is in dollars.) ...

    Started by ossicle‎, 01-24-2013 01:15 PM
    • Replies: 8
    • Views: 4,046
    01-31-2013, 10:39 AM Go to last post
  38. sketching distribution

    I am taking a tutorial online and I ran into a quiz but I am totally new to stats..could someone help with the question below? Thank you very much in...

    Started by mazatlan‎, 02-21-2013 11:13 AM
    • Replies: 8
    • Views: 1,958
    02-21-2013, 12:40 PM Go to last post
  39. Cool Any One Can Tell Me Desirable Properties of Interval Estimation ?????

    Dear All of you i need your help i need help about this "Desirable Properties of Interval Estimation "

    Started by ameeq7746‎, 03-05-2013 11:49 AM
    • Replies: 8
    • Views: 1,443
    11-21-2013, 11:48 AM Go to last post
  40. Trouble with Calculating maximum Likelihood Estimate and Bayes Estimate

    Hi, I solved this problem and just not sure if I can go even further. Suppose that X is a geometric random variable with density function ...

    Started by Slime‎, 03-14-2013 01:52 PM
    • Replies: 8
    • Views: 2,673
    03-14-2013, 04:37 PM Go to last post
  41. nonparametric linear regression

    Hi I would like to run a linear regression to predict variable X, however it is severely positively skewed and the usual transformations don't help...

    Started by Palermo‎, 05-20-2013 02:54 AM
    • Replies: 8
    • Views: 2,067
    05-22-2013, 08:01 PM Go to last post
  42. How to prove that a sample is statistically significant?

    Hello, I've been searching all over the internet for a formula or a test that will help me understand if my sample (41 answers) is statistically...

    Started by bsantos‎, 06-13-2013 05:42 AM
    sample size, statistical significance
    • Replies: 8
    • Views: 2,422
    06-13-2013, 05:32 PM Go to last post
  43. Red face Factor Analysis with perfectly correlated variables

    Hi, FA#1: I ran a standard factor analysis in STATA (with varimax rotation) with 16 variables. Based on the Kaiser criteria I retain the 4...

    Started by Stacy_MUN‎, 06-18-2013 06:38 AM
    factor analysis
    • Replies: 8
    • Views: 3,646
    06-19-2013, 01:24 PM Go to last post
  44. Please have a look at my MLR Diagnostics

    I've created two multiple linear regression models for two different continuous outcome variables. The diagnostics look acceptable to me. Outcome for...

    Started by StatsClue‎, 07-24-2013 08:37 AM
    • Replies: 8
    • Views: 2,644
    07-26-2013, 01:35 PM Go to last post
  45. Outliers and correlation

    Hi all Im working on small size sample (17) . and need to do correlation for alot of prameters my questions is : -is removing the outliers is...

    Started by lora‎, 08-01-2013 12:05 PM
    correlatiomn, outliers
    • Replies: 8
    • Views: 2,848
    08-02-2013, 06:08 AM Go to last post
  46. Variance Inflation Factor

    Consider the linear model Y = B0 + B1X2 + B2X2 + e where the columns x1 and x2 of the design matrix have mean 0 and length 1. That is x1'x1 = 1 and...

    Started by simplemts‎, 07-07-2013 03:02 PM
    • Replies: 8
    • Views: 2,295
    07-07-2013, 05:35 PM Go to last post
  47. Sampling Procedure Help Needed for Constructing a Confidence Interval

    Hi all. Quick background: I am a 64 year old lady going back to college to get my Bachelor's. I haven't taken a college course in 30 years :shakehead...

    Started by jjonesfk‎, 07-18-2013 12:06 PM
    • Replies: 8
    • Views: 8,444
    07-26-2013, 12:49 PM Go to last post
  48. ANOVA or Correlation?

    Hi everyone, I'm researching foreign language classroom anxiety and with a 33-item 5-point likert scale and got stuck due to some discrepant...

    Started by Jamiryo‎, 07-17-2013 05:03 AM
    • Replies: 8
    • Views: 2,563
    07-19-2013, 03:22 PM Go to last post
  49. Simple Statistics Review Questions. PART 2

    So i have a review test on monday, and i'm trying to get through these review questions. Unfortunately i have no idea how to do some of these...

    Started by mikey32230‎, 08-25-2013 11:12 AM
    • Replies: 8
    • Views: 2,118
    08-25-2013, 01:43 PM Go to last post
  50. The role of beer in statistics

    This is a test to see if Dason views this thread first.

    Started by trinker‎, 09-06-2013 01:14 PM
    test
    • Replies: 8
    • Views: 1,948
    09-06-2013, 03:23 PM Go to last post
  51. Regression analysis data distribution

    Hello colleagues, Could you please help me understand the following? I am making a linear regression analysis and my dependent variable is...

    Started by alexeymosc‎, 10-17-2013 03:01 AM
    • Replies: 8
    • Views: 2,107
    10-19-2013, 04:00 AM Go to last post
  52. Mean, median, mean

    Hi! Seemingly easy question, but I'm really struggling with this. I am trying to determine the "average number" of units bought per customer,...

    Started by Amanda_UK‎, 01-15-2014 01:06 PM
    • Replies: 8
    • Views: 2,236
    01-16-2014, 01:02 PM Go to last post
  53. Logistic Regression: Goodness of Fit Query

    I am using binary logistic regression. Event 1 - 750 Event 0 - 60500 I have 5 independent variables of which 2 are binary. All my predictors...

    Started by prakritinaswa‎, 10-07-2013 02:59 PM
    • Replies: 8
    • Views: 1,550
    10-09-2013, 03:03 PM Go to last post
  54. Correlations between dichotomous and continuous variables

    Hello, I need to run a correlation in SPSS between two variables. One is a dichotomous variable (A). People have either answered the question...

    Started by barker‎, 11-07-2013 07:46 AM
    • Replies: 8
    • Views: 23,720
    11-07-2013, 11:11 AM Go to last post
  55. Rayleigh estimator and correction factor

    We're using the Rayleigh distribution for some real-world scenarios. We often need to estimate its parameter (sigma) from samples R of size N where...

    Started by dbooksta‎, 10-28-2013 09:27 PM
    correction factor, estimator, mle, rayleigh
    • Replies: 8
    • Views: 3,189
    11-08-2013, 06:33 AM Go to last post
  56. Expected v.s. observed variance from binomial distribution

    Hello friends! I'm doing some self-learning about statistics with the book Biometry, 3rd Edition by Sokal and Rohlf. I'm doing the exercises...

    Started by njdowdy‎, 10-12-2013 03:03 PM
    • Replies: 8
    • Views: 5,109
    10-12-2013, 05:43 PM Go to last post
  57. R2 in SEM decreases when adding more variables

    In an SEM analysis using SPSS AMOS with 9 latent constructs, I am trying to establish incremental validity between a basic model of 4 constructs and...

    Started by DrMaphuse‎, 12-10-2013 11:05 PM
    • Replies: 8
    • Views: 6,640
    12-13-2013, 06:54 AM Go to last post
  58. Please help with homework 2 questions :(

    Hello, guys. I was doing ok so far but I have no idea how to do this bit: Table 2: summary statistics indicating the % of drivers using hand-held...

    Started by sunshine_75‎, 12-03-2013 05:50 PM
    • Replies: 8
    • Views: 1,866
    12-04-2013, 07:57 PM Go to last post
  59. testing for normality

    I have a really elementary question, please for give me:- Of the following scenarios, when should parametric tests be used, and when shouldn't...

    Started by bobmcpop‎, 12-13-2013 12:24 PM
    • Replies: 8
    • Views: 1,448
    12-26-2013, 03:58 PM Go to last post
  60. statistics help

    i really need help with this assignment so far i have attempted this but i dont know if its right. my answers are: 1) 33.25% 2)25% 3) 0.0004...

    Started by titanlord1‎, 02-05-2014 06:44 PM
    • Replies: 8
    • Views: 1,612
    02-07-2014, 04:56 PM Go to last post

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