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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: 184,914
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: 60,940
09-30-2005, 09:44 AM
1. ### Question about degrees of freedom in an independent sample t-test

I've been asked the following question by a scientist who is not a statistician: Suppose we take a sample \$x_1,…,x_n\$ from a population that we can...

• Replies: 0
• Views: 49
Yesterday, 01:00 PM
2. ### How to do calculate test statistic (x^2) in spss or any online calculator?

How to do calculate test statistic (x^2) in spss or any online calculator? Given 2 groups, expected and actual.

• Replies: 1
• Views: 127
Yesterday, 11:32 AM
3. ### stuck with this problem!!!! need help

The minimum force required to break a particular type of cable is normally distributed with mean 12,432 and standard deviation 25. A random sample of...

• Replies: 4
• Views: 2,623
07-18-2017, 10:51 AM
4. ### Normal Distribution Overlap

Is there a way that I can calculate the probability that a data point would fall in the region where two normal distributions with different means...

• Replies: 17
• Views: 23,004
07-18-2017, 02:24 AM
5. ### interesting sampling question

I have two samples of the same population and wish to reduce the sample sizes, but maintain the same ratio of precision produced in the original...

• Replies: 6
• Views: 235
07-17-2017, 02:04 PM
6. ### Weekly Sales - statistical analysis

I need to analyze sales on hourly level, and compare hourly sales of one day with same day in last 10 weeks. Following is the data set: -Day -Hour...

• Replies: 0
• Views: 95
07-17-2017, 12:42 PM
7. ### Help with data analysis of 7-Point Likert Scale needed

Dear all, I'm investigating perceptions of effective leadership of Germans and Indians. Part of the questionnaire assessed the attitude towards...

• Replies: 0
• Views: 101
07-17-2017, 06:57 AM
8. ### Cronbachs Alpha- Quick question, urgent help needed

Hi guys, hope you are all doing fine. I have an exam on monday and need to know how to calculate Cronbach's alpha. I know that you have to use...

• Replies: 1
• Views: 174
07-15-2017, 02:22 PM
9. ### ITU-R recommendation P.530; staistical data; basic interpretation needed!

I am trying to translate a statistical database from ITU-R (the administration that sets out recommendations for the engineering of wireless systems)...

• Replies: 0
• Views: 146
07-15-2017, 01:51 PM
10. ### Urgent stats help needed for medical research project

Hi everyone!! URGENT HELP NEEDED!! Thanks for trying to help - I'm trying to submit a research grant and there are a few questions about the...

• Replies: 5
• Views: 213
07-15-2017, 02:15 AM
11. ### Delphi assessment..., which tests?!

Hi all, I've recently undertaking a Delphi workshop in an attempt to establish an expert opinion upon the importance of a series of behaviours to...

• Replies: 0
• Views: 122
07-14-2017, 04:07 PM
12. ### Statistical test for comparing percentage not mean

Hi, I am wondering what test should I use to compare two percentage value from two different observations. Let's say I have a damage of crop 15%...

• Replies: 2
• Views: 164
07-14-2017, 09:19 AM
13. ### Intraclass Correlation Coefficient: Single Measures or Average Measures

For our research we use Intraclass correlations (ICC's), but I can't figure out wether I need to use the Single Measures-value or the Average...

• Replies: 0
• Views: 116
07-14-2017, 04:31 AM
14. ### Test sensitivity for a given category or category sensitivity?

Hello everybody, I want to study several parameters (i.e. sensitivity, specificity, precision and F1-score) of a given test. To do so, I'm...

• Replies: 2
• Views: 116
07-13-2017, 11:37 AM
15. ### Combined p-value of ANOVA tests and its post hoc tests

Hi all! I have conducted a one way ANOVA test of the impact of 3 different shoes on oxygen consumption of a runner and got a P-value of 0.12 (for...

• Replies: 1
• Views: 157
07-11-2017, 06:55 AM
16. ### Mean = 27.6, lately 24, is there a signifcant difference?

Hello! I am having a major brain issues today, and have a question that I believe many people will be able to help me with. I have a task I...

• Replies: 2
• Views: 156
07-10-2017, 03:38 PM

Hi everyone. I am a new member of this great forum. I have some question sheets of my exam and I can't answer them. My exam will be taken on...

• Replies: 1
• Views: 138
07-09-2017, 04:54 PM
18. ### Factorial Within-Subjects Repeated Measures ANOVA... Sample Size?!

Apologies for the title, it's a bit of a mouthful...! I am attempting to calculate the minimum sample size to achieve 80% power, with alpha of...

• Replies: 1
• Views: 252
07-08-2017, 08:10 PM
19. ### Conditional Probability

Hi! If X ~ Unif(0,100) and Y|X ~ Poisson(mX) where m is some scalar Then how can I find the distribution of Y? Thank you!!!!

• Replies: 1
• Views: 187
07-07-2017, 12:14 PM
20. ### Wls regression

How do we compute the weights in WLS regression? Step by step explanation would be really helpful. After, we compute the weight then how to do we...

• Replies: 1
• Views: 195
07-07-2017, 12:13 PM
21. ### degrees of freedom in a survey

Removed question........

• Replies: 1
• Views: 156
07-07-2017, 12:08 PM

In a class, Budi's score is greater than Doni's. The sum of Adi's and Doni's scores is greater than the sum of Budi's and Coki's scores. Meanwhile,...

• Replies: 2
• Views: 260
07-05-2017, 08:15 PM
23. ### Measure Volatility or Stability Of Lists of Floating Point Numbers

Hi, Wonder if anyone can help. I have a set of lists of numbers, around 300 lists in the set, each list of around 200 numbers. What I wish to...

• Replies: 2
• Views: 171
07-04-2017, 03:55 AM
24. ### This Thread has easy example dataset! :D Help choose the right test please!

We're trying to test whether there is a difference in length of visit (in minutes) between our original website and: Revamped Website #1 Revamped...

• Replies: 1
• Views: 172
07-03-2017, 04:07 PM
25. ### Best alternative test for F test and t test for two independent sample population?

Hi, We use F-test and T- test for our research purposes. i would like to know more effective and efficient hypothesis test methods for validation...

• Replies: 1
• Views: 164
07-03-2017, 03:43 PM
26. ### comparing three sets

Dear all, I have three sets, A (495 elements), B (1130 elements) and C (812 elements). The elements are biological entities bound by a...

• Replies: 1
• Views: 152
07-03-2017, 01:45 PM
27. ### Significance test for gender differences in groups

Hi everyone, I have 5 different treatments and want to test whether there are statistically significant more women/ men in one treatment than the...

• Replies: 3
• Views: 286
07-01-2017, 09:46 AM
28. ### Selection of Priors for Bayes (Logistic)

Well I am working on slowly incorporating a more Bayesian approach in order to get away from NHST. I am running a Bayesian logistic model with one...

• Replies: 4
• Views: 326
06-30-2017, 10:18 PM
29. ### random sampling versus choice based sampling

Hi everyone, I have got a question about sampling. I have collected all the available firms from a database and the resultant dataset is an...

• Replies: 2
• Views: 215
06-30-2017, 07:44 PM
30. ### Manova's Box test of equality is not computed

Happy Holidays everyone! I have been trying to run a MANOVA with one IV (factor) where there are 6 categories and 24 summed questionnaire items...

• Replies: 1
• Views: 3,005
06-29-2017, 10:37 AM
31. ### Which test to use?

I have two groups: A and B. Group A consists of products (#1,#2,#3..) that use component X or Y (but not both) All products in group A experienced...

• Replies: 0
• Views: 192
06-27-2017, 12:51 PM
32. ### Correlation b/w continuous and categorical variables in SAS?

I would like to look at the correlation of a hormone level (continuous variable) and a genotype activity (categorical variable with the following...

• Replies: 3
• Views: 269
06-26-2017, 12:18 PM
33. ### ROC curve based on means and variances of controls and cases

Hi! Does anyone know of an R package (or any other statistical freeware or just a piece of code in a general purpose language) that lets you plot...

• Replies: 3
• Views: 277
06-26-2017, 11:48 AM
34. ### Is 3% difference significant in an experiment?

I am trying to see if certain change in a survey will impact the response rate. I sent the survey to 3277 people in the experimental group (with...

• Replies: 2
• Views: 294
06-23-2017, 02:37 PM
35. ### Need to Confirm Statistics before coding a script

I actually have 2 statistic questions. My goal is to determine what all the exact combinations are of answering a multiple-choice quiz of 5...

• Replies: 0
• Views: 196
06-23-2017, 08:31 AM
36. ### Adjusting for covariates in correlation test

Hi, I wonder if it is possible to adjust for covariates when we use PROC CORR (correlation test) in SAS. Thanks!

• Replies: 4
• Views: 648
06-22-2017, 02:26 PM
37. ### I need some help for my thesis about t-testing different data sets

Hello everybody, I'm conducting research on price dispersion to show that offline price dispersion is significantly smaller than online price...

• Replies: 1
• Views: 169
06-22-2017, 12:14 PM
38. ### Diff p-value when using 1wayANOVA and 2wayANOVA on same set of data

I used the 2way ANOVA to compare 2 treatments (control vs. T1) across 4 groups (A-D). I used the 1way ANOVA to compare 3 treatments (control vs. T1...

• Replies: 2
• Views: 141
06-22-2017, 12:07 PM
39. ### observed value of z

What is an observed value of z? Why it is called an "observed" value? I think we all calculate it by using the formula but not observe (notice or...

• Replies: 1
• Views: 159
06-22-2017, 11:51 AM
40. ### Standardization without specific knowledge

Hope you can help me. I need an age and/or gender standardization for a task regarding drug perscriptions. I have information about how many...

• Replies: 0
• Views: 140
06-22-2017, 10:34 AM
41. ### Statistical Correlation

HI!! I have a problem. I have to check if there is a correlation between these groups of values: granulometry, humidity, melting percentage....

• Replies: 0
• Views: 234
06-21-2017, 12:15 PM
42. ### Calculate fits of Markov Switching AR (1) model

I have created a MS-AR(1) model in EViews 9.5 (the software I'm working with) and I'm just trying to understand how some of the output is calculated....

• Replies: 0
• Views: 221
06-20-2017, 11:31 AM
43. ### Permutations with restrictions

Good evening .... my question is more conceptual than arithmetical. a given question says: Example 5 Cont.: How many 4-digits number can be...

• Replies: 1
• Views: 225
06-19-2017, 03:21 PM
44. ### what statistics to use to know if "the difference of the differences" is different

For the following scenario, what statistics can I use - 10 high school boys, 20 high school girls, 30 college men, 25 college women I am trying...

• Replies: 1
• Views: 424
06-13-2017, 06:06 PM
45. ### MANOVA - How to deal with unequal group sizes?

Hi, I have an intervention group (N=1282) and a much smaller control group (N=40) who I have assessed at two different time points (repeated...

• Replies: 0
• Views: 337
06-12-2017, 04:01 AM
46. ### Which type of analysis should I do? HELP!! Dissertation Issues!

Finally getting back to research for my dissertation after a 4 year break from the classroom!! need some help on which analyses are best for some of...

• Replies: 1
• Views: 229
06-11-2017, 11:06 PM
47. ### Hypothesis testing for treatment effects

Hi all, I have estimated the average treatment effect on the treated (ATT) by propensity score matching for two samples concerning two different...

• Replies: 0
• Views: 262
06-11-2017, 07:48 PM
48. ### Z-test for proportions Vs Chi-square. What is the difference

As per object. Can someone explain me the difference between the two?

• Replies: 2
• Views: 496
06-11-2017, 02:16 PM
49. ### Can different measures of central tendency/dispersion be compared?

Hi there, I'm wondering, let's say I have two variables, one that is ordinal and one that is interval/ratio. For the ordinal variable I am able...

• Replies: 4
• Views: 532
06-11-2017, 01:58 PM
50. ### The Normal Distribution - How does it keep going if the dist of scores stop at zero?

Hi there, I'm trying to figure out how the normal distribution works if a distribution of scores is normally distributed, but the scores don't go...

• Replies: 5
• Views: 589
06-11-2017, 01:43 PM
51. ### Is this analysis (ANOVA and pairwise, with a potential cov.) statistically flawed?

Hi Everyone, Below is an abbreviated adaption of my study. Subjects were to find three given types of faces - namely the Good, the Bad and the Ugly....

• Replies: 2
• Views: 307
06-08-2017, 07:39 PM
52. ### binomial test

hi how i can use binomial test for general business?

• Replies: 1
• Views: 424
06-08-2017, 02:29 PM
53. ### Establishing Causality

Hi All, I'm new to this forum and have a very basic question. How do we establish causality after establishing association? Do we have any...

• Replies: 10
• Views: 800
06-08-2017, 02:27 PM
54. ### Probability of exact value of normally distributed variable

(disregard the nevermind, I still haven't quite figured it out) In the solutions manual for Bayesian Data Analysis on problem 1.1b, the author...

• Replies: 6
• Views: 377
06-07-2017, 03:46 PM

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