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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: 200,384
    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: 68,589
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,030
    10-02-2016, 01:28 PM Go to last post
  2. 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: 1,180
    10-02-2016, 10:36 AM Go to last post
  3. 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: 1,277
    10-02-2016, 01:23 AM Go to last post
  4. 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: 3,357
    10-01-2016, 04:14 PM Go to last post
  5. 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: 1,213
    09-30-2016, 07:21 PM Go to last post
  6. 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: 1,657
    09-30-2016, 12:03 AM Go to last post
  7. 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: 1,449
    09-29-2016, 01:17 PM Go to last post
  8. 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: 2,918
    09-29-2016, 06:30 AM Go to last post
  9. 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: 1,871
    09-28-2016, 12:07 PM Go to last post
  10. 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: 1,040
    09-26-2016, 05:15 PM Go to last post
  11. Calculating probabilities over time?

    Hello, I'm looking to learn how to calculate probability of an event happening over time. The easiest way to express it is in a dice analogy. I...

    Started by Ferg Deluxe‎, 09-26-2016 01:45 PM
    • Replies: 1
    • Views: 1,263
    09-26-2016, 01:48 PM Go to last post
  12. Generating rates: individual level or aggregate??

    Using approach 1; the average number of infraction per 100 days is 0.7 and option 2 ((7/175)*100)=0.9

    Started by Marvin85‎, 09-26-2016 01:18 PM
    aggregate, rates
    • Replies: 0
    • Views: 1,361
    09-26-2016, 01:18 PM Go to last post
  13. Repeated measures anova?

    Hey guys i am struggling to decide on the correct test I should run for the following design: I am comparing one treatment and one control...

    Started by kasperski‎, 09-19-2016 10:52 AM
    • Replies: 5
    • Views: 2,422
    09-26-2016, 12:01 PM Go to last post
  14. Need Help Understanding Calculation of Printed Circuit Board Design Time

    First post here. If it's not appropriate or needs moved, I apologize. FWIW, this is not a homework problem... I'm in need some help understanding...

    Started by mbeaver‎, 09-22-2016 10:26 AM
    • Replies: 3
    • Views: 2,398
    09-26-2016, 09:39 AM Go to last post
  15. Sampling.

    Suppose any body interested to take up a study on healthcare utilization by differently able person, say he/she has resources for sample of size 100...

    Started by Suvamoy‎, 09-25-2016 12:02 PM
    • Replies: 1
    • Views: 1,739
    09-26-2016, 08:44 AM Go to last post
  16. Function output difference

    I have two 'unknown' functions that I need to test the check if there is any difference in their outputs. In the easiest case the output is...

    Started by kataka‎, 09-26-2016 06:31 AM
    • Replies: 0
    • Views: 1,008
    09-26-2016, 06:31 AM Go to last post
  17. Question regarding conditional probability. Did I get this correct when explaining?

    Hello, I'm constantly getting my conversations marked off because I'm not writing exactly what the teacher wants. Here is the question that was...

    Started by dbrantley64‎, 09-24-2016 02:55 PM
    • Replies: 1
    • Views: 1,960
    09-24-2016, 05:52 PM Go to last post
  18. Question Can Variance be used as an output variable?

    For example, in an experiment the output data (y axis) becomes more dispersed as some input variable (x axis) is changed. So if there seems to be a...

    Started by jarvis‎, 09-22-2016 05:37 AM
    dhglm, gamlss
    • Replies: 6
    • Views: 1,587
    09-24-2016, 10:52 AM Go to last post
  19. Question Good source for post hoc test selection?

    Hi all - How do I select the most appropriate post hoc (post ANOVA) test? It's data from a normal distribution, 4 groups, experimental data from...

    Started by jarvis‎, 09-23-2016 11:21 AM
    • Replies: 0
    • Views: 1,172
    09-23-2016, 11:21 AM Go to last post
  20. p-value

    Can someone please help me understand what this means in plain english? The p-value = 2 x < .001, and the results are highly significant. Am I...

    Started by kdsan‎, 09-22-2016 12:31 PM
    • Replies: 6
    • Views: 1,440
    09-23-2016, 08:55 AM Go to last post
  21. Exclamation SOS-Where to begin on this complex data set and what Stat Model to use?

    Hi Everyone, This is my first time EVER posting anything on the web for help, so here it goes. Recently I applied for a job and they sent me...

    Started by sandiegon8tive‎, 09-22-2016 06:18 PM
    • Replies: 0
    • Views: 607
    09-22-2016, 06:18 PM Go to last post
  22. Best statistics textbooks to read to tackle this type of exam?

    The prescribed textbook we use is our course at ANU is Keller, I have read the book and did most of the end of chapter questions. But the lecturer...

    Started by financialwar‎, 09-22-2016 07:24 AM
    • Replies: 2
    • Views: 1,428
    09-22-2016, 05:52 PM Go to last post
  23. Which model to use?

    Hi all, I am attempting to model some data but it has been a while since I completed my masters so my statistical skills are not what they used to...

    Started by Manj999‎, 09-22-2016 05:15 AM
    • Replies: 0
    • Views: 859
    09-22-2016, 05:15 AM Go to last post
  24. Is Paired T-test the right tool to use?

    Hi! I want to know whether the paired t-test can be used when the variables for comparison are different (but measuring similar constructs and on...

    Started by Leona‎, 09-21-2016 08:59 PM
    • Replies: 1
    • Views: 1,618
    09-21-2016, 10:58 PM Go to last post
  25. Help with Correlation

    Hello! I need help for an issue i have. Let's assume that we have data of two variables (X and Y) for 14 different people. We can find the...

    Started by m1chael‎, 09-21-2016 06:26 AM
    correlation, multiple
    • Replies: 10
    • Views: 1,743
    09-21-2016, 06:26 PM Go to last post
  26. Understanding: Mean Square Treatments ~ Mean Square Error If Null Hypothesis is True

    I am having difficulty understanding how the Mean Square Treatments should be approximately the same as the Mean Square Error if the null hypothesis...

    Started by negodfre‎, 09-21-2016 09:12 AM
    • Replies: 0
    • Views: 1,194
    09-21-2016, 09:12 AM Go to last post
  27. HELP! Manipulation of a survey question to a Value

    I got a result of survey asking "What percentage of banking applications are designed for mobile access today? where the answers can be -Under 5%,...

    Started by yoni‎, 09-21-2016 01:49 AM
    • Replies: 0
    • Views: 1,035
    09-21-2016, 01:49 AM Go to last post
  28. Thumbs up Central tendency in stattistic:

    If anyone want to calculate or estimate average age of people of a country (say India) what will be the appropriate method- mean, median or mode and...

    Started by Suvamoy‎, 09-20-2016 07:06 AM
    • Replies: 5
    • Views: 1,771
    09-20-2016, 12:45 PM Go to last post
  29. finding percentile from z-score

    I have this question which i am so confused how to solve it this is on normal curve. The following table is used to determine the student’s...

    Started by x509‎, 09-19-2016 09:51 PM
    • Replies: 1
    • Views: 1,255
    09-20-2016, 06:24 AM Go to last post
  30. Standard Dev Question

    Hey guys! Could you guys help with these questions? 1.Which of the two histograms has the larger mean? Explain? 2.Which of the two histograms has...

    Started by collegekid5‎, 09-18-2016 09:56 PM
    • Replies: 3
    • Views: 1,312
    09-19-2016, 06:05 AM Go to last post
  31. Difference in proportion for large sample size

    Hi, I have 2 proportions from 2 years: P1(2001): 11000/12500 = 88.0% P2 (2002): 11500/12800 = 89.8% I am interested in knowing if there is a...

    Started by pazuuu‎, 09-18-2016 04:36 AM
    • Replies: 3
    • Views: 1,838
    09-18-2016, 09:33 AM Go to last post
  32. F-Statistic

    I'm trying to understand the intuition behind the F-Statistic. In ISLR: F=(TSS-RSS)/p /RSS/(n-p-1) The numerator is described as the "between...

    Started by droma3‎, 09-15-2016 09:11 AM
    f statistic
    • Replies: 5
    • Views: 3,187
    09-18-2016, 04:17 AM Go to last post
  33. Are the parametric analyses appropriate?

    In an experimental study, the aesthetic value (independent var) of a picture is manipulated into (low and high quality). "Low Quality" -- to make it...

    Started by uxk8396‎, 09-15-2016 07:08 PM
    anova, manova, regression analysis
    • Replies: 0
    • Views: 1,050
    09-15-2016, 07:08 PM Go to last post
  34. Confidence Interval Estimate Between Two Means

    Hello all. New user, first time poster, but this looks like a community that can help me learn. I am taking a statistics course and I am at a...

    Started by bvbull200‎, 09-15-2016 05:08 PM
    • Replies: 0
    • Views: 1,913
    09-15-2016, 05:08 PM Go to last post
  35. Themes in Survey Response, maybe PCA

    I have a sample of 50 respondents to a cross-sectional (identical) survey administer at four time points. The instrument asks the potential...

    Started by hlsmith‎, 09-15-2016 09:45 AM
    • Replies: 9
    • Views: 2,550
    09-15-2016, 02:06 PM Go to last post
  36. Cope with distributions that may take negative numbers

    Hi to everyone, I would like to know how to cope with distributions that may take negative numbers when it is physically impossible. For instance,...

    Started by davidvansan‎, 09-13-2016 04:48 PM
    2 Pages
    1 2
    non-negative, normal
    • Replies: 16
    • Views: 2,964
    09-15-2016, 09:27 AM Go to last post
  37. Standard Error of Coefficient w/1 Independent Variable

    Hi- I'm studying regression via ISLR and trying to manually calc a standard error for a data set to better understand the intuition. Below is my R...

    Started by droma3‎, 09-13-2016 10:53 AM
    • Replies: 2
    • Views: 1,677
    09-15-2016, 09:03 AM Go to last post
  38. Which hypothesis test to use

    I'm doing an assignment and am just a bit rusty and confused. I don't want the answer to the question, just guidance on what sort of test to use. ...

    Started by alldaybrkfst‎, 09-14-2016 05:25 AM
    • Replies: 2
    • Views: 1,286
    09-14-2016, 09:40 AM Go to last post
  39. Student T-Test on Area Sizes and P-Value significance

    Hello. I am running a t-test. 2 groups, group 1 is a area size of a vein before intervention and the second is a vein after intervention. Some...

    Started by kozak94‎, 09-13-2016 08:10 PM
    • Replies: 1
    • Views: 869
    09-14-2016, 09:26 AM Go to last post
  40. Assess statistical significance of two PPVs

    I recently validated a medical diagnosis in order to compose a study population. To do so, we classified each patient with a diagnosis of interest as...

    Started by marsh_randy‎, 09-13-2016 09:23 AM
    difference, positive predictive value, test of significance, validation
    • Replies: 2
    • Views: 1,134
    09-13-2016, 01:57 PM Go to last post
  41. Degrees of Freedom for linear combination of VarianceComponents

    I was trying to figure out satterthwaite's degrees of freedom for the combination of variance component to calculate confidence interval. I can...

    Started by dsj‎, 09-13-2016 01:27 PM
    variance components
    • Replies: 0
    • Views: 907
    09-13-2016, 01:27 PM Go to last post
  42. Which ANOVA to use? one-way repeated measures ANOVA test, or a two-way multi-variate

    Problem 1 Research Question 1: What effect does providing captions while learners are watching a video have on their comprehension of the video? ...

    Started by jamestoffee‎, 09-13-2016 08:00 AM
    • Replies: 1
    • Views: 907
    09-13-2016, 09:32 AM Go to last post
  43. Unhappy (too) small sample size?

    Without going into too much detail: I have a number of people every year. At one point, something happens that makes the yearly number of people...

    Started by tessa001‎, 09-12-2016 01:11 PM
    help me, online course, statistics
    • Replies: 1
    • Views: 1,413
    09-13-2016, 02:22 AM Go to last post
  44. ikelihood

    hello, I have a question about the topic ikelihood. In the literature, the likelihood function is used for the estimation of the parameters, and in...

    Started by andrew_fg‎, 09-12-2016 05:12 AM
    ikelihood
    • Replies: 1
    • Views: 1,304
    09-12-2016, 05:25 PM Go to last post
  45. Likert Survey -- Stat for comparing single items and sub categories

    Hello, For my dissertation I am using an existing 50 item Likert survey. I am pretty sure I will use a t-test to determine if there are...

    Started by mlewisstats‎, 09-12-2016 01:57 AM
    difference, likert, t-test
    • Replies: 1
    • Views: 727
    09-12-2016, 03:40 AM Go to last post
  46. Data Extrapolation for SEM

    Hi, I have a data of n=50. Is there any way in which I can extrapolate or simulate the data to n=2000, in order to carry out Structural equation...

    Started by alexpjoy‎, 08-17-2016 05:56 AM
    • Replies: 4
    • Views: 1,762
    09-07-2016, 03:10 PM Go to last post
  47. Biased and Unbiased Variance

    Hello everyone, I did an binomial experiment to flip 10 coins and count the total number of heads.This was repeated 200 times.However at the end...

    Started by Miguelogy‎, 09-07-2016 04:03 AM
    • Replies: 3
    • Views: 3,654
    09-07-2016, 07:04 AM Go to last post
  48. Can a non-baseline variable be used as a co-variate in ANCOVA?

    Dear All, I have a question related to selection of covariates in ANCOVA analysis. I understand that baseline covariates can be selected based...

    Started by placebo‎, 09-07-2016 04:21 AM
    • Replies: 0
    • Views: 1,275
    09-07-2016, 04:21 AM Go to last post
  49. Question is a standard deviation value valid when n is 2?

    is a standard deviation value valid when n is 2?

    Started by KHoss‎, 09-06-2016 05:05 PM
    • Replies: 3
    • Views: 2,445
    09-06-2016, 08:23 PM Go to last post
  50. Interpretation of 99% confidence interval

    Hello guys, this is my first post here in the forum and if I missed anything, then pls correct me. My first statistic class starts this week...

    Started by 7thSlap‎, 09-06-2016 10:32 AM
    • Replies: 8
    • Views: 1,549
    09-06-2016, 04:09 PM Go to last post
  51. Comparing counts with chi square test of homogeneity

    Hi! I need to compare the results of two computer simulations in order to establish their equivalence. Each simulation result (actually it is the...

    Started by deusex‎, 09-06-2016 04:57 AM
    • Replies: 0
    • Views: 1,464
    09-06-2016, 04:57 AM Go to last post
  52. Paired Sample T-Test, Bivariate Correlation, Factors Influencing Resistance to Change

    Hi there, My study investigates factors that influence resistance to change in an organisation. The independent variables are: trust,...

    Started by GioiaD‎, 09-06-2016 01:56 AM
    bivariate correlations, paired sample t-test, pearsons correlation, spss, stepwise regression
    • Replies: 0
    • Views: 2,181
    09-06-2016, 01:56 AM Go to last post
  53. Law of Large numbers(turning pen experiment)

    Hello everyone, My class did an turning pen experiment in class,where we turn a pen 5 times eventually, each time there is a possibility of the...

    Started by Miguelogy‎, 09-05-2016 10:44 AM
    • Replies: 4
    • Views: 1,667
    09-05-2016, 11:46 PM Go to last post
  54. Examine the effect of one independent var

    Hi, I want to examine the effect of still images (independent var) with two levels (monochromatic and multi-color) on mood perception (dependent...

    Started by uxk8396‎, 09-05-2016 07:32 PM
    anova, regression analysis, statistical analysis
    • Replies: 0
    • Views: 1,356
    09-05-2016, 07:32 PM Go to last post
  55. calculate the standard error of the mean

    To whom it may concern: I have a cognition experiment which has 10 subjects. Each subject performs 400 trials. My advisor wants me to...

    Started by Jay Chen‎, 09-04-2016 09:15 PM
    standard error of mean
    • Replies: 2
    • Views: 2,439
    09-05-2016, 09:41 AM Go to last post
  56. Sampling Technique and Sample Size

    Hi, I intend to estimate household level gas consumption for a city with a population of 1 million and 200,000 houses through a survey. The city...

    Started by has70‎, 09-02-2016 02:13 PM
    • Replies: 3
    • Views: 2,237
    09-03-2016, 08:36 PM Go to last post
  57. N particles in 2 boxes - distinguishable/indistinguishable - probability association

    Hi there I'm new here, I have this question on my homework that has been bugging me for a couple of days now and I was wondering if anybody could...

    Started by koalabear‎, 09-03-2016 05:55 AM
    mechanics, physics, statistics, thermodynamics
    • Replies: 1
    • Views: 1,564
    09-03-2016, 08:50 AM Go to last post
  58. Partial Autocorrelation Function

    Hello everyone, I am preparing for a test and I have came across a question I am having problems with: Calculate partial autocorrelation of...

    Started by Lukasz_‎, 09-03-2016 05:45 AM
    arima, autocorrelation, timeseries analysis
    • Replies: 0
    • Views: 1,026
    09-03-2016, 05:45 AM Go to last post
  59. Fisher's exact test - two-tailed

    Hi guys, I performed a fisher's exact test on Genstat and got this result: One-tailed significance level 0.563 Mid-P value 0.371 Two-tailed...

    Started by mgzx‎, 09-03-2016 04:28 AM
    fisher's exact test, p-value, two-tailed
    • Replies: 1
    • Views: 1,682
    09-03-2016, 05:26 AM Go to last post
  60. Question about permutations ANOVA test

    Hello everyone, I have data of a variable from 4 sites, with 3 repetitions from each site. Tests revealed that I do have homoscedasticity but no...

    Started by Royan‎, 08-31-2016 06:31 AM
    anova, permutation, repetitions
    • Replies: 8
    • Views: 1,313
    09-02-2016, 05:31 AM Go to last post

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