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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 11:13 AM
    • Replies: 1
    • Views: 133,400
    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: 37,947
    09-30-2005, 09:44 AM Go to last post
  1. What method to choice?

    Dear TalkStat friends, I have merged two databases (a=22,000 cases;b=12,000 cases). The two databases are the following a= diabetes screening...

    Started by drgunnar‎, Today 07:17 AM
    • Replies: 2
    • Views: 67
    Today, 01:37 PM Go to last post
  2. NCE: how to find population mean/variance/standard error

    I have been given a homework problem with NCE with an average score of 100, and individual's score of 130. Can anyone guide me to a resource that...

    Started by nijm‎, Today 10:45 AM
    nce, population mean, population variance
    • Replies: 0
    • Views: 46
    Today, 10:45 AM Go to last post
  3. Which test for significance: Compare counts between two time points [Excel]

    Hello - First time poster. Thank you in advance for any advice that you can give. I am conducting a simple descriptive analysis of patients who...

    Started by sjmcd13‎, 12-04-2012 02:03 PM
    • Replies: 5
    • Views: 3,429
    Yesterday, 05:13 PM Go to last post
  4. Linear regression Equation?

    Hi All, I need to determine whether two continuous variables are positively associated or not. I believe that this required a simple linear...

    Started by chiccaboom‎, 12-09-2012 06:13 PM
    • Replies: 4
    • Views: 573
    Yesterday, 04:51 PM Go to last post
  5. The appropriate regression analysis

    The study is about the factors (Independent Variables) affecting a choice between two alternatives (Dependent Variable). The study includes a...

    Started by Acc1987‎, 10-20-2016 06:31 AM
    • Replies: 2
    • Views: 152
    Yesterday, 06:00 AM Go to last post
  6. Choosing the right statistical test

    Hello, I have a data set like: Different men group Diets Preference(0 no preference/1 preference) A FI ...

    Started by Shyam23‎, Yesterday 02:31 AM
    • Replies: 0
    • Views: 52
    Yesterday, 02:31 AM Go to last post
  7. Bemused by student question.

    We have taken a simple random sample to estimate the mean of a population. A student asked me - The numbers near the middle of our sample will...

    Started by katxt‎, 10-22-2016 09:24 PM
    • Replies: 9
    • Views: 241
    10-23-2016, 06:50 PM Go to last post
  8. Comparing two groups for equivalence / non-inferiority

    Hello, First post - newbie here. I work in medicine and currently working on a project that involves comparing the outcomes of two groups of...

    Started by massafin‎, 10-23-2016 12:13 PM
    • Replies: 1
    • Views: 77
    10-23-2016, 01:23 PM Go to last post
  9. Sampling Distribution Question

    I found an question while reading the textbook, but i not really understand how to answer it, hope to get some help from you guys. A restaurant...

    Started by a22747568‎, 10-19-2016 08:24 AM
    • Replies: 1
    • Views: 257
    10-22-2016, 03:06 PM Go to last post
  10. How to compare 2 groups where 1 has repeated measures

    Hello, I have three groups: healthy controls, pre-surgery, and post-surgery. The pre and post-surgery are the same patients who participated in...

    Started by kbsmale‎, 10-21-2016 07:19 AM
    mixed design, repeated measure anova, repeated measures design
    • Replies: 3
    • Views: 115
    10-22-2016, 09:01 AM Go to last post
  11. How to show statistical significance of one choice in a 4 choice question?

    Participants are shown a video of two performers. They are then asked to select an option from the following 4 choices: 1. Performer A exhibits...

    Started by compsci‎, 10-21-2016 08:41 AM
    significance, significance test
    • Replies: 1
    • Views: 120
    10-21-2016, 07:48 PM Go to last post
  12. Comparing the differences between two samples

    Okay, it has been quite a few years since I have really used any statistics concepts so I am puzzled on what is probably a simple problem that is...

    Started by Cheeseburger‎, 10-19-2016 08:50 PM
    • Replies: 1
    • Views: 121
    10-21-2016, 06:44 PM Go to last post
  13. Z scores

    Scores on a statistics final were normally distributed with a mean of 75 and a standard deviation of 8? -What proportion of the scores were above...

    Started by palpulla‎, 10-09-2016 04:47 PM
    z scores
    • Replies: 4
    • Views: 206
    10-20-2016, 09:14 PM Go to last post
  14. Finding factors from a collected survey using SPSS

    Dear all, I have a pool of data collected from over 1,000 participants. All of them filled out the same survey containing the same questions. The...

    Started by ggma1989‎, 10-17-2016 07:14 PM
    • Replies: 0
    • Views: 139
    10-17-2016, 07:14 PM Go to last post
  15. Unsure about the range(s) to use for double integration

    f(x,y)=c(x+y); 3<x<7, 2<y<4, x>y i am supposed to find the value of c. i know i have to integrate the double integration of f(x,y) and then...

    Started by 4april‎, 10-17-2016 12:02 AM
    • Replies: 1
    • Views: 130
    10-17-2016, 06:32 AM Go to last post
  16. Help!! a little confused with ANOVA, should be easy

    Dear all, I would like to ask for your help in determining which test I should run for my samples. Here is my data: I have 4 water samples of...

    Started by johnnyboy‎, 10-10-2016 08:52 AM
    anova, data, spss, test
    • Replies: 3
    • Views: 208
    10-16-2016, 03:52 PM Go to last post
  17. Does anyone know how to do this?

    An independent-measures research study compares three treatment conditions with a sample of n = 10 in each condition. The sample means are M1 = 2,...

    Started by EdD stathelp‎, 10-15-2016 07:30 PM
    • Replies: 3
    • Views: 154
    10-15-2016, 09:01 PM Go to last post
  18. Stratified Samples - Introductory Statistics

    Good evening, My name is Simran & I am a student who is taking introduction to statistics. I have no clue on what I am doing here and would...

    Started by SBrarr‎, 10-10-2016 09:50 PM
    • Replies: 1
    • Views: 121
    10-15-2016, 03:54 PM Go to last post
  19. Standard Uniform Distribution

    Hi, how to prove that U~uniform is equivalent to (i.e. if and only if) ~uniform{0,1,2,...,n-1} for all positive integers n. is the floor function. I...

    Started by geniusacamel‎, 10-12-2016 08:36 PM
    • Replies: 9
    • Views: 264
    10-15-2016, 03:14 PM Go to last post
  20. Which type of test to use?

    I have a data set of 58 records. Question 1: I want to view compare mean SAT scores by male/female. 40% of the records are Male, 60% female. ...

    Started by kdsan‎, 10-15-2016 02:29 PM
    • Replies: 0
    • Views: 99
    10-15-2016, 02:29 PM Go to last post
  21. Which type of test to use?

    I have a data set of 58 records. Question 1: I want to view compare mean SAT scores by male/female. 40% of the records are Male, 60% female. ...

    Started by kdsan‎, 10-15-2016 02:04 PM
    • Replies: 0
    • Views: 84
    10-15-2016, 02:04 PM Go to last post
  22. Calculating a test statistic

    Basically I have to run a simulation based on this information. http://imgur.com/Mv9g9RP But I have no idea how to calculate the test...

    Started by confusedstatperson‎, 10-10-2016 10:51 PM
    • Replies: 1
    • Views: 147
    10-15-2016, 10:16 AM Go to last post
  23. What is the best statistics test for this questions??

    Can somebody help me in my statistical problems? I have measured heart rate of fish during temperature increased. I have wanted to find temperature...

    Started by jthaverinen‎, 10-13-2016 08:16 AM
    • Replies: 1
    • Views: 84
    10-15-2016, 09:58 AM Go to last post
  24. Significance test for questionnare

    Hello everybode I would be forever greatfull for some guidence. I have been browsing the internet for 2 hours now but not gotten any spot on answer...

    Started by Kokaloka‎, 10-14-2016 08:22 AM
    • Replies: 2
    • Views: 84
    10-15-2016, 07:50 AM Go to last post
  25. Incomplete factorial or nested effect??

    Hi all, We have some doubts about which exact model fits the following data: It is a 2 factor design, where one of the factors (storage...

    Started by Kalean Gaude‎, 10-15-2016 02:37 AM
    incomplete factorial, nested 2-w anova, spss 22
    • Replies: 1
    • Views: 78
    10-15-2016, 03:13 AM Go to last post
  26. Question Beginner: Guidance Required in studying effect of dichotomous var on ratio

    Hi, I have a simple test where I want to measure the effect of a couple of variables on an outcome. Independent: Var_1: Dichotomous, particular...

    Started by m0x1n‎, 10-13-2016 09:48 AM
    • Replies: 6
    • Views: 174
    10-14-2016, 10:06 AM Go to last post
  27. interpreting f-values within a n-way anova

    Hi, f-value determines the statistical significance of a main effect. I would like to find out in if the following is valid: 2 f-values for the 2...

    Started by statbaby‎, 10-11-2016 07:54 PM
    • Replies: 6
    • Views: 254
    10-14-2016, 08:51 AM Go to last post
  28. Large Sample Confidence Interval for the Mean - Problem is it right ???

    The president of Jones Bank asked his research team to determine the average waiting time for its customer. A study of 100 customers was conducted...

    Started by ANNJALA‎, 10-13-2016 02:15 PM
    confidence intervals, wait time
    • Replies: 3
    • Views: 143
    10-14-2016, 07:02 AM Go to last post
  29. Should splitting data improve the standard error?

    I am simulating random samples of 20 from normal data mean 20, SD 5. The SE of the mean should be SD/sqrt(20) = 1.12. If I estimate the SE from...

    Started by katxt‎, 10-12-2016 04:35 PM
    • Replies: 5
    • Views: 170
    10-14-2016, 02:17 AM Go to last post
  30. Run regression in matched groups?

    Hi, I have 3 groups of data. SGA: <5% birth weight, AGA: 5%≤birthweight≤95%, and LGA: >95% birth weight. 50 SGA and LGA cases were selected...

    Started by harryxie‎, 10-12-2016 09:51 PM
    • Replies: 0
    • Views: 85
    10-12-2016, 09:51 PM Go to last post
  31. Statistical tests to use when comparing different Likert scales?

    I am conducting a research to test for participant motivation in a social movement project. I have grouped the motives into 5 different categories...

    Started by wildtal31‎, 10-12-2016 12:07 AM
    likert scale, likert scale analysis, likert scales
    • Replies: 1
    • Views: 130
    10-12-2016, 04:15 AM Go to last post
  32. Overlapping confidence intervals

    I have run an experiment looking at how repeatable urban and rural birds are in response to a stimulus (i.e. do they behave in the same way each time...

    Started by shardman‎, 10-11-2016 04:28 AM
    • Replies: 4
    • Views: 148
    10-11-2016, 08:52 AM Go to last post
  33. sum of errors not 0

    I was just looking at some numbers (percentages, if that's useful for this question), and I've been really confused by something: my errors do not...

    Started by fffrost‎, 10-11-2016 01:31 AM
    • Replies: 4
    • Views: 158
    10-11-2016, 08:13 AM Go to last post
  34. Testing for interaction effect btw two continous variables.

    Hi, I have 3 variables, A, B and C. All of them are continuous, assymetrical in distibution. Using sperman correlations, I've found that A/B (A...

    Started by trexter‎, 10-10-2016 05:48 AM
    • Replies: 5
    • Views: 175
    10-11-2016, 05:29 AM Go to last post
  35. 1-sample binomial for my research data?

    Hi, Newbie here so I will try to explain as clearly as I can. I do research in the neuro field. I have a control group of neurons that I am...

    Started by nufo‎, 10-10-2016 03:43 PM
    binomial, chi sq test, t-test
    • Replies: 1
    • Views: 113
    10-11-2016, 12:16 AM Go to last post
  36. New guy "stumped" on a HW problem

    Hello, I found this forum and hoped I would be able to get help with a problem that is just consuming all of my time. It involves finding the...

    Started by Sublime440‎, 10-10-2016 09:17 PM
    • Replies: 0
    • Views: 119
    10-10-2016, 09:17 PM Go to last post
  37. Assume that radon measurements are normally distributed

    with mean 4.1 and standard deviation 0.2. -Find the median of the measurement? -What is the probability the radon measurements exceed 4.5...

    Started by palpulla‎, 10-09-2016 07:17 PM
    • Replies: 1
    • Views: 131
    10-09-2016, 08:00 PM Go to last post
  38. Need help with two problems involving Poisson Distribution

    Let me clarify something first. I already know the answers. What I need to know are the steps I need to take. The first one I couldn't solve myself....

    Started by PricklyPear‎, 10-07-2016 11:34 PM
    • Replies: 4
    • Views: 273
    10-09-2016, 08:20 AM Go to last post
  39. Test the validity of a sample from a survey

    Dear All, I have someone extracted a 30% raw data from a full Household Survey. I am not sure how he extracted the 30%, I am worried that the 30%...

    Started by Aziz‎, 10-09-2016 06:43 AM
    • Replies: 0
    • Views: 122
    10-09-2016, 06:43 AM Go to last post
  40. Help with simple CI for proportion using SRS

    I'm having difficulty with the following problem: Imagine you are a gerontologist who is interested in investigating the proportion of households...

    Started by BK3‎, 10-08-2016 06:24 PM
    • Replies: 5
    • Views: 186
    10-09-2016, 01:11 AM Go to last post
  41. Significance Percentage for Average Gift Size

    Hi, I am looking for some help here. I work for a non profit organization and we sent out a direct mail package to donors - a standard control and...

    Started by Dan Crafton‎, 10-08-2016 07:15 AM
    • Replies: 0
    • Views: 131
    10-08-2016, 07:15 AM Go to last post
  42. CI for "Conversion Rate"

    In digital media, we have a metric called "conversion rate", which is simply conversions / impressions. Impressions represent the total number of...

    Started by chelovek‎, 10-07-2016 10:56 AM
    • Replies: 1
    • Views: 147
    10-08-2016, 06:41 AM Go to last post
  43. Question on Standard Error

    If I need to compute the standard error for a bunch of students' test averages, and there are 20 students, each of whose score is itself an average...

    Started by patrickcolby9‎, 09-28-2016 08:17 PM
    sem, significance, standard error
    • Replies: 2
    • Views: 193
    10-08-2016, 03:34 AM Go to last post
  44. Paired T test sample size

    I'm dealing with a study that compares three different daily regimens of one drug in same patients (morning, noon, evening). Blood parameter that...

    Started by Markica85‎, 10-08-2016 02:26 AM
    • Replies: 0
    • Views: 144
    10-08-2016, 02:26 AM Go to last post
  45. Select and Delete Missing

    Hi all, I'm looking to find a syntax-based method for deleting cases that contain ANY values/date, OR, to delete cases with missing values. I'm...

    Started by Darko_Giac‎, 10-06-2016 07:37 PM
    • Replies: 0
    • Views: 152
    10-06-2016, 07:37 PM Go to last post
  46. Lower/Upper confidence limits for 5/9 point rating scales

    If you have a rating scale such as are used on product websites where users enter scores 1,2,3,4,5 (five values) and averages are (presumably)...

    Started by parisl‎, 10-05-2016 05:14 PM
    confidence interval, confidence limits, discrete variable
    • Replies: 0
    • Views: 131
    10-05-2016, 05:14 PM Go to last post
  47. Inferential Stats: Estimating Pop St. Deviation/Variance - Chi Square

    Hello, I have questions regarding some elements of Estimating a Population Standard Deviation via the Chi Square method... Please note that I am...

    Started by ironfelix717‎, 10-03-2016 08:25 PM
    • Replies: 1
    • Views: 232
    10-05-2016, 09:06 AM Go to last post
  48. Simulation

    Hi Guys I'm working on 800 bivariate data. ( loss & Expense) . I've found fitted distribution which was Pareto. I also worked on Copula to find the...

    Started by Zore‎, 10-05-2016 04:52 AM
    • Replies: 0
    • Views: 116
    10-05-2016, 04:52 AM Go to last post
  49. Why experiment outcome is against universal endorsement-no blinding or subject error?

    Hi, Thanks for attention! Here's the question I am struggling with: Medical researchers studying the effects of a low carb diet versus a...

    Started by reree‎, 10-03-2016 11:08 PM
    • Replies: 1
    • Views: 346
    10-03-2016, 11:15 PM Go to last post
  50. What is the p-value in a rank-biserial correlation?

    Hello, can someone tell me how to compute the p-value in a rank-biserial correlation? I understand the rank-biserial correlation coefficient is a...

    Started by marklee_csu‎, 09-30-2016 06:40 PM
    mann-whitney u, rank-biserial correlation, somers d
    • Replies: 3
    • Views: 260
    10-02-2016, 09:50 PM Go to last post
  51. Help with homework

    On a homework assignment, I have a data set with the variables (in SPSS) 1) Age 2) Reactiontime (continuous) 3) drug (Placebo, or drug...

    Started by ianmckay2‎, 10-02-2016 01:28 PM
    dependent sample, repeated measures, statistics, t-test, variable
    • Replies: 0
    • Views: 192
    10-02-2016, 01:28 PM Go to last post
  52. How to prove the magnitude of improvement (two data sets)?

    Hi Guys! I am struggling a bit with some statistical validations. Currently using Google Analytics in order to get data from my website. Testing...

    Started by analytics_stats‎, 10-01-2016 10:55 AM
    • Replies: 2
    • Views: 205
    10-02-2016, 10:36 AM Go to last post
  53. question about data description

    Dear forum members, I have a tibble called smoke, containing 300 rows (one row for each subject) and two variables (group and race.) Group takes...

    Started by Ricky Moore‎, 10-01-2016 11:59 PM
    • Replies: 1
    • Views: 175
    10-02-2016, 01:23 AM Go to last post
  54. Bionomial Probability Distributions

    51% of men consider themselves professional baseball fans. You randomly select 10 men and ask each if he considers himself a professional baseball...

    Started by rihnavy‎, 09-30-2016 04:05 PM
    bionomial distribution, probability, statistics help
    • Replies: 5
    • Views: 284
    10-01-2016, 04:14 PM Go to last post
  55. Am I interpreting this correctly?

    I have a continuous DV and 2 categorical + 1 continuous IVs. In spss I did a univariate analysis and found a main effect of one of the categorical...

    Started by vl11‎, 09-30-2016 07:21 PM
    glm, spss
    • Replies: 0
    • Views: 149
    09-30-2016, 07:21 PM Go to last post
  56. Binomial Distribution : Probability equation solution

    Question :In a binomial distribution for p=.48, q=1-p=.52 find the population size n1 so that P(X>=3)=.95 My solution : P(X>=3)=.95 can be...

    Started by vikrambahadur‎, 09-29-2016 07:17 AM
    binomial distribution
    • Replies: 2
    • Views: 217
    09-30-2016, 12:03 AM Go to last post
  57. Why do we take normal samples?

    Hey everyone!I have a problem on understanding on an intuitively level some things in statistics and therefore I wish that you could help me.My...

    Started by Elisavet‎, 09-29-2016 01:54 AM
    • Replies: 1
    • Views: 181
    09-29-2016, 01:17 PM Go to last post
  58. Binomial distribution problem

    I'm having trouble setting up this problem. Any help would be appreciated. Here's the question: If the number of defective items selected at...

    Started by scrawnavec‎, 09-28-2016 10:41 PM
    • Replies: 1
    • Views: 178
    09-29-2016, 06:30 AM Go to last post
  59. Testing for significance: Disease Prevalence vs Disease Severity

    Hi Folks, This is my first post and low and behold, it's a help request. I am a relative stats beginner and I have been searching the net for...

    Started by jonpaul31‎, 05-21-2014 05:26 AM
    disease, prevalence, severity
    • Replies: 6
    • Views: 601
    09-28-2016, 12:07 PM Go to last post
  60. Statistics Distribution

    Hey all, I have a question that I am not sure how to solve. The firm Colddrinks produces a new kind of orange juice in bottles with label...

    Started by jejenial‎, 09-26-2016 05:15 PM
    • Replies: 0
    • Views: 182
    09-26-2016, 05:15 PM Go to last post

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