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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 200,178
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 68,457
09-30-2005, 09:44 AM
1. ### Choosing prior for the regression coefficients in the logistic regression

I'm trying to model Bayesian logistic regression model (using JAGS in R) with my dependent variable (status: 0=alive, 1 death) & independent variable...

• Replies: 2
• Views: 173
09-26-2017, 08:46 AM
2. ### 90% Confidence Problem

This is the question I am struggling with, it is from a set of practice questions but I am trying to understand how to do this for my upcoming exams,...

• Replies: 1
• Views: 282
09-25-2017, 02:38 PM
3. ### Defect Rates

I have two sample sizes with different defect rates because of the size differences. I need a way, preferably in Excel, to determine if the defect...

• Replies: 6
• Views: 414
09-25-2017, 07:37 AM
4. ### How do i calculate sample mean values given μ, σ, n and alpha?

If I'm given a population mean and sd, how can I calculate a sample mean that encloses a central distribution of means for certain values of n and...

• Replies: 0
• Views: 241
09-24-2017, 10:43 PM
5. ### Help - How do you calculate Z scores given mean and standard deviation?

I need to calculate z(obs) when given mean and standard deviation from a population and one sample, as in μ0 =32, σ0 =10, m=27, and n=25, assuming...

• Replies: 2
• Views: 227
09-24-2017, 10:07 PM
6. ### Summation Algebra

Hi guys, new member :D: Here is the question I'm having trouble with: I was having trouble with this as I haven't taken stats in years....

• Replies: 0
• Views: 396
09-24-2017, 02:24 PM
7. ### Should I use chi squared to test these observed vs expected ratios?

I'm doing a study about the height:radius ratios of limpets on exposed and sheltered shores (The ratio is calculated by dividing height by radius)....

• Replies: 2
• Views: 268
09-24-2017, 06:04 AM
8. ### Sample mean differs from population mean due to weighting

Hi folks, The disclaimer first: I'm not primarily trained in statistics, so this problem might sound very naive to the experienced statisticians....

• Replies: 5
• Views: 407
09-22-2017, 06:48 PM
9. ### 2 Sample Distribute

ROA is an indicator how profitable a company Is relative to its assets. Note: I know I haven't given the dataset.

• Replies: 1
• Views: 234
09-22-2017, 06:17 PM
10. ### Should you use a dependent t-test to measure difference across time?

Is it proper to use dependent t-test to measure difference across time for scores IF the participants are different people? Although they are...

• Replies: 5
• Views: 339
09-22-2017, 05:58 PM
11. ### How do I calculate the variance of the ratio of two independent variables?

If I have two independent variables (say X and Y) with their respective variances (or standard deviation), how could I calculate the mean and...

• Replies: 1
• Views: 219
09-22-2017, 09:39 AM
12. ### Comparing methods of standardising variables

I have count data of the number scattered photons detected at various wavelengths. The data is collected under different conditions, so it is normal...

• Replies: 4
• Views: 312
09-22-2017, 05:43 AM
13. ### How do I pose a hypothesis for a partial correlation?

Hello everyone, in my thesis I have following hypothesis: 3a: Internet skills are positively correlated with the frequency of experiencing risks...

• Replies: 0
• Views: 214
09-22-2017, 02:01 AM
14. ### Statistical Method Help!

I have a set of data that I would like to test a hypothesis against (H0: Mean Difference = 0 vs. H1: Mean Difference <> 0). I have a time 1 and time...

• Replies: 1
• Views: 222
09-21-2017, 08:08 AM
15. ### Help needed in SPSS

Hello ! With a friend, we have a paper to write about the fail of measures to counter the illegal downloading of music in our country, for that...

• Replies: 5
• Views: 446
09-21-2017, 06:41 AM
16. ### Statistical test and error bars?

Hi! I'm completely new to statistics so I'm a bit stuck! I'v been treating 4 groups of human cells (all originally from the same batch) with...

• Replies: 1
• Views: 216
09-20-2017, 02:38 PM
17. ### Beginner Stats: which t-test should I use for these scenarios?

I have been asked to run t-tests in a dataset for the following two scenarios: 1. Test whether people with a masters degree watch less television...

• Replies: 3
• Views: 282
09-20-2017, 10:26 AM
18. ### Is it possible to create live anova table for excel

Hi, I am chemist and running laboratory with more than 200 parameters. For all parameters, my team make 15*2 to 5(no of anayst) analysis to...

• Replies: 1
• Views: 275
09-17-2017, 02:59 PM
19. ### From variance to 95% confidence interval: Is this done right?

Hello I have a forest inventory project where I am trying to estimate the total forest wood volume (in cubic feet) with a 95% confidence...

• Replies: 4
• Views: 506
09-13-2017, 05:39 PM
20. ### Central Limit Theorem Indicative of Underlying Distribution?

Hi All, I've been reading threads off and on for a couple days, and I can't get a good feel for how to answer this question I've got stuck in my...

• Replies: 4
• Views: 434
09-13-2017, 12:23 PM
21. ### Bias

I know only one definition of bias in statistics: the expected difference between the estimator and the parameter. Are there any alternative...

• Replies: 3
• Views: 313
09-13-2017, 09:43 AM
22. ### Which statistical test to use?

Hi everyone, we ran a within-subjects user study with three different independent variables (A, B, and C). We measured e.g. task completion times...

• Replies: 1
• Views: 411
09-11-2017, 04:14 PM
23. ### Probability and Statistics

This a problem set of a friend of mine. 1. A shipment of 12 calculators contains 3 defective calculators. In how many ways can a school purchase 5...

• Replies: 1
• Views: 2,076
09-10-2017, 02:07 PM
24. ### How can I determine if two graphs are statistically significantly different

Hi, I'm working on a medical research project and need some stats help. I have limited statistical knowledge but I understand that basics. I need...

• Replies: 11
• Views: 626
09-09-2017, 12:38 PM
25. ### Discriminating Power

• Replies: 0
• Views: 280
09-09-2017, 07:08 AM
26. ### Confusion between z and t values

Hi, Alright so I have some confusion on when to use specific tests and the z vs t test. Given this example (not my homework) could someone please...

• Replies: 1
• Views: 325
09-08-2017, 06:51 AM
27. ### Which test to use to compare data sets with a small sample size?

So I have several data sets, but each data set consists of only 7 values. I know some of the data sets are non-normal distributed (or at least I did...

• Replies: 6
• Views: 315
09-08-2017, 04:23 AM
28. ### Repeated measures ANOVA but non parametric & missing values

I am trying to compare a matched cohort of repeated measures (continuous variables) - within each treatment arm with 5 time points comparing to...

• Replies: 3
• Views: 304
09-07-2017, 09:34 AM
29. ### Analyzing skewed data, how to determine % spread and variation? Testing method error

Hello everyone, I'm trying to determine the overall error of a measurement method by comparing it to the true value. I have a set of data which...

• Replies: 9
• Views: 556
09-06-2017, 11:47 PM
30. ### How to test if gender impacts mortality rates when already considering age

Hi, I am currently working on a research project where I'm analysing the impact of different factors on mortality. I have the past 10 years of...

• Replies: 4
• Views: 551
09-06-2017, 04:12 PM
31. ### What kind of test for...

Hi guys, i have multiple biological parameters in multiple patients during a period of two years and when to check for correlation or relation ...

• Replies: 13
• Views: 452
09-06-2017, 03:09 PM
32. ### ANOVA on different metrics

Hi everyone! Hoping you can help me with a question. I am doing a paper for university. I did a test on a group of people so as to measure their...

• Replies: 3
• Views: 384
09-03-2017, 02:28 PM
33. ### Comparing three metrics statistics

Hi there, I am doing an analysis on the time it took for a group to do the same task on three different websites. I got the time it took on each...

• Replies: 0
• Views: 269
09-03-2017, 10:28 AM
34. ### Whether to use z test or t test

hi team, I got the following question given below. According to me this should be solved using z test as the sample size is more than 30. But they...

• Replies: 5
• Views: 436
08-31-2017, 11:02 AM
35. ### Need help please, should I use ANOVA or chi square?

Hi there! I am trying to work on a university paper and I am having a hard time with the stats part. I have asked some participants (29) to...

• Replies: 11
• Views: 641
08-31-2017, 10:56 AM
36. ### What is the reason behind getting unbiased and efficient estimator by ranked set samp

In ranked set sampling (RSS), we select n random sets, each of size n. Then we choose the largest unit from the 1st set, 2nd largest from the 2nd...

• Replies: 4
• Views: 297
08-31-2017, 10:41 AM
37. ### Forming a null and alternative hypothesis and then testing it.

I am given the following data: Observation Wage 1 \$8.75 2 \$10.00 3 \$10.25 4 \$6.50 5 \$15.00 6 \$10.00 7 \$8.00

• Replies: 6
• Views: 372
08-30-2017, 07:01 PM
38. ### I need help figuring out type of analysis for duration of therapy and adverse outcome

Hi everyone, I have a prospective cohort of 90 subjects who were previously on drug X (duration of drug X = "varx"), now on drug Y and followed...

• Replies: 9
• Views: 472
08-29-2017, 02:36 PM
39. ### Urgent!

Hello there :) It's probably really straight forward but I'm having a very hard time trying to find a relationship between variables. I have an...

• Replies: 1
• Views: 391
08-28-2017, 10:36 AM
40. ### URGENT! Reviewing SPSS output

Hi guys, I'm needing help with figuring out my results for logistic regression, I have to get this in to my supervisor in 6 hours and I'm freaking...

• Replies: 3
• Views: 637
08-27-2017, 05:44 PM
41. ### which model to use? Help for newbie

Hello! I am trying to determine which model would be best to use to solve the following problem. I am looking at the occurrence of patient to patient...

• Replies: 2
• Views: 556
08-25-2017, 02:05 PM
42. ### Help please - what tests do I need to do?

Hi, I'm struggling to figure out which tests I need to do for my project. I have two things I need to do. 1) I need to know whether males and...

• Replies: 4
• Views: 620
08-25-2017, 01:11 PM
43. ### Help!! to analyse the data using statistics

hi everyone!!i need to explain statistics model in my assignment and i have no idea about statistics. i have been going thorough all those model...

• Replies: 1
• Views: 434
08-24-2017, 10:17 AM
44. ### one way ANOVA

I have a question as well.. In a one way - analysis of variance, when the in - between variance is high and the within variance is low, how would...

• Replies: 1
• Views: 406
08-23-2017, 04:32 AM
45. ### Inter-assay variability

Hi everyone, I am currently working on my MSc thesis and have talked myself around in circles and have gotten completely lost. I am trying to...

• Replies: 0
• Views: 791
08-22-2017, 02:16 PM
46. ### general Question

Hi Guys, I have a question regarding my upcoming exam. I am practising with Multiple Choice questions. There is one question that confuses me: ...

• Replies: 2
• Views: 373
08-22-2017, 11:23 AM
47. ### Sample Size Calculation

Hi, New to the stats so apologies in advance. Is it possible to use a sample size calculation to find the delta to determine if values from...

• Replies: 2
• Views: 367
08-21-2017, 05:24 PM
48. ### spss and likert scale

Hi,wondering if you can help. I am using a likert scale which does not give much information as to how to analyse the score. In theory, the...

• Replies: 1
• Views: 387
08-20-2017, 06:02 PM
49. ### Sampling Distribution

Hi Guys, I hope you can help me out to figure what I am doing wrong... I have the answer to the exercise and I don't get how I find something...

• Replies: 0
• Views: 241
08-20-2017, 05:53 AM
50. ### Reject or Accept?

I am a student in my 2nd year of university studying marine biology and doing a retake this Tuesday - sadly none of the answers for the past papers...

• Replies: 0
• Views: 296
08-19-2017, 10:07 AM
51. ### How is this calculated

On page 128 there is a table showing how much 'life misery' can be reduced by eliminating different issues - such as poverty and mental illness. But...

• Replies: 1
• Views: 491
08-18-2017, 07:54 AM
52. ### Post-hoc power analysis for a Welch ANOVA and also a Kruskal-Wallis test.

I planned to analyse some data with several ANOVAs (I have many different dependent variables), but much of the data violates the ANOVA assumptions,...

• Replies: 7
• Views: 510
08-18-2017, 05:52 AM
53. ### Testing assymetry between 2 models with F-test

Hello, I would like to know whether it is acceptable to use a general linear F-test, supposed to compare two models (a full model and a restricted...

• Replies: 1
• Views: 462
08-18-2017, 03:08 AM
54. ### Species abundance statistical comparison assistance

Hi, I am new to statistics and needing to apply a relevant statistical test to the following question: Is the presence/abundance of species X...

• Replies: 2
• Views: 386
08-17-2017, 06:15 AM
55. ### Name Research: Between and Within Subjects

First time poster here, trying to remember stats from grad school 10 years ago. I'm running a naming survey with 20 names and 1600 respondents. I...

• Replies: 1
• Views: 334
08-16-2017, 05:11 PM

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