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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: 196,608
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: 66,642
09-30-2005, 09:44 AM
1. ### How to resolve "the null hypothesis" question?

Design a decision rule to test the hypothesis that a coin is fair if a sample of 72 tosses of the coin is taken and if a level of significance of...

• Replies: 0
• Views: 876
04-07-2016, 04:33 AM
2. ### 3 x 2 Repeated measures ANOVA question

Hello, I'm doing a study in which I'm looking into the effects of three different repeated sprint training modes on performance, whilst also...

• Replies: 0
• Views: 1,015
04-06-2016, 02:41 PM
3. ### Test similar to Chi-Sqaured?

I know nothing about statistics but I want to find out if responses to one question in my survey influences responses to another. Unfortunately my...

• Replies: 0
• Views: 833
04-06-2016, 02:06 PM
4. ### Analysing multiple independent variables (continous and discrete data) using ANOVA

To provide some context to my question, I have been tasked with identifying features that have an effect on sales for a company. This company owns 6...

• Replies: 0
• Views: 957
04-06-2016, 08:05 AM
5. ### Is the Null Hypothesis ... ?

If the alternative hypothesis is mu>13 then what is the null? Is it a) mu<=13 or b) mu=13 I've seen both a) & b) so what's the rationale for...

• Replies: 3
• Views: 1,266
04-06-2016, 06:14 AM
6. ### How To Set A Target?

Hi all, First of all I'm happy being a member of this great forum. I'm a team leader in call centre industry and have some targets that...

• Replies: 1
• Views: 921
04-05-2016, 04:26 PM
7. ### puzzle problem.

Hello, trying to solve this problem for academic conference we are planning. - Attendees are divided equally into 8 groups (A-H). - Each group...

• Replies: 0
• Views: 1,104
04-05-2016, 01:04 PM
8. ### Two sample t test proof problem

Can someone please explain the reasoning behind this? Verify that the two sample t test at the level of alpha of H0:ux=uy versus Ha: ux=\uy...

• Replies: 1
• Views: 1,329
04-05-2016, 10:15 AM
9. ### Statistics with different number of stimuli

Hy, I must compare three groups with the same size (20 subjects for each group). I administered a test of emotion decoding (the stimuli are photo of...

• Replies: 0
• Views: 917
04-05-2016, 03:12 AM
10. ### Indecision about a time series analysis

Hello people, I would like to ask for you help about my analysis. I explain it briefly : I have daily insect captures from a set of traps located...

• Replies: 2
• Views: 1,099
04-05-2016, 02:47 AM
11. ### Chi-square post hoc?

Hello I have been researching various options to interpret output for a 3 x 2 chi-square, as although I can confidently determine that my chi-square...

• Replies: 4
• Views: 2,635
04-04-2016, 11:38 AM
12. ### Subscripts following F-values?

As part of my masters project, I am required to report F-values to display the main effects of an ANOVA. When going through the relevant literature,...

• Replies: 2
• Views: 1,601
04-04-2016, 07:04 AM
13. ### Compute an asymptotic interval with an approximation (Delta method)

Dear all, I am performing an analysis where I need to calculate the percent attenuation between two CI (of OR or RR or HR) Essentially, I have a...

• Replies: 1
• Views: 1,504
04-04-2016, 02:49 AM
14. ### Priori power calculation

I'm about to conduct a study as part of my PhD and am a bit confused on my supervisors advice on conducting a priori power calculation to determine...

• Replies: 4
• Views: 984
04-03-2016, 10:10 AM
15. ### Finding the mean and standard deviation with only percentile data?

Assuming the data is normal, how do I find the mean and std deviation? I have the following: 10th percentile - 75,174 25th percentile - 81,627...

• Replies: 3
• Views: 1,256
jro
04-02-2016, 07:04 PM
16. ### Comparing hours worked between two groups

I am trying to compare the hours worked during a 3 month time frame for two groups of people, male and female. What I want to tell is if there is...

• Replies: 1
• Views: 1,019
04-01-2016, 06:50 AM
17. ### Imputing missing values thanks to correlated data ?

Hello everyone, I'm new here, nice to meet you :) As English is not my native language, I apologise if I'm not always clear, please don't hesitate...

• Replies: 9
• Views: 1,753
04-01-2016, 04:26 AM
18. ### Chi squared

I am measuring if a number of different parameters of two populations changed with time Male (24 changed, 13 did not change) Female (32 changed, 5...

• Replies: 4
• Views: 1,596
04-01-2016, 04:15 AM
19. ### What stat test to use when comparing against a control?

Hey guys, I've done an experiment where a participant ingested alcohol and did reaction time tests (every 15 minutes while it was eliminated). I...

• Replies: 2
• Views: 1,427
03-30-2016, 03:53 PM
20. ### Confidence Interval

The equation for the relationship between the amount of body fat (Y ) to 3 predictors, which are triceps skinfold thickness (X1), thigh circumference...

• Replies: 0
• Views: 763
03-30-2016, 03:37 PM
21. ### Effect size for ANCOVA?

Hi everyone, Maybe I'm not looking in the right places, but I'm having a really hard time finding out how to do an effect size for ANCOVA in...

• Replies: 2
• Views: 987
03-30-2016, 11:49 AM
22. ### how to forcast sales data(other techniques besides moving averages?)

I'm new to the idea of forcasting, so want to get some inputs as I'm just experimenting with the data and going through a beginners book. I have...

• Replies: 1
• Views: 932
03-29-2016, 05:20 PM
23. ### What figures to report and which tool to use?

Dear All I asked 200 people a multiple-choice question with four possible answer options and received the following responses: Option A: 2...

• Replies: 0
• Views: 762
03-29-2016, 04:48 AM
24. ### Factor analysis completed but shows diff factors in subscales to authors

hi there I have conducted a factor analysis (well I think I did this correctly - that could be another question) as per the author/creator of a...

• Replies: 0
• Views: 828
03-28-2016, 06:39 PM
25. ### What stat test to perform on non-parametric nominal data between several groups

Hi everyone :wave: I hope this is the right forum for this thread. Anyways, I'll cut the chase: I need to assess statistical differences of...

• Replies: 0
• Views: 864
03-28-2016, 03:43 PM
26. ### naive questions

Hi, I am currently learning Machine Learning. I have couple of questions. 1.)what is the difference between statistical models and machine learning...

• Replies: 2
• Views: 1,727
03-28-2016, 11:19 AM
27. ### Handle questionnaires/survey data

Hi! How do I best take care of survey data, in Excel or SPSS? Let´s say I have a questionnaire with 15 questions (3 background variables: gender,...

• Replies: 4
• Views: 1,994
03-27-2016, 06:27 PM
28. ### Logistic regression interpretation for an idiot

Hi. I'm not a statistician.... more of an statistidiot. I have been trying for some time to understand logistic regression interpretation but am...

• Replies: 9
• Views: 1,587
03-26-2016, 07:37 AM
29. ### K-means++ Question

What is set X of input instances for K-means++ with the following property? For any p > 0 there is a set of points x ∈ X such that K-means++ with...

• Replies: 0
• Views: 1,124
03-26-2016, 12:17 AM
30. ### is this difference significant?

Hello! I'm new to this forum, so I'm not sure if this question is a silly one. I'm on a team at work that is using an employee satisfaction survey to...

• Replies: 3
• Views: 1,513
03-25-2016, 04:06 PM
31. ### Contradiction: '‘Estimation of fixed effects’ vs ‘Type III test fixed effects'?

Hi there, I’m trying to evaluate if there is an effect of a treatment (3 levels) on coffee plants height over 10 different periods of time. Plants...

• Replies: 0
• Views: 1,895
03-25-2016, 11:04 AM
32. ### Stats hw help please

Below are a group of numbers that represent given vote counts from an election: 31 132 8550 17 10 2270 55 1492

• Replies: 0
• Views: 905
03-23-2016, 11:51 PM

Hello, I'm trying to use Median Absolute Deviation as a way of determining outliers using this article as a guide. ...

• Replies: 5
• Views: 1,935
03-23-2016, 10:50 PM
34. ### Z Test or Chi2?

Hi, I have a difficulty rationalising which test to use and would appreciate any advise here! Thanks a million in advance! Basically, i have 2...

• Replies: 4
• Views: 1,204
nec
03-22-2016, 07:51 PM
35. ### What kind of statistical method to use?

Good day, I have plenty of summed calls from patients. They summed by month from 2010 to 2014 year. Patients are man or woman only (as...

• Replies: 0
• Views: 975
03-22-2016, 09:38 AM
36. ### Ranking

Hi Can someone help me! I have two sets of data one is the total cost and other is units of activity e.g Total cost. ...

• Replies: 0
• Views: 897
03-22-2016, 02:04 AM
37. ### Regression

Hi there, I'm exploring the relationship between GDP/capita and voter turnout in European countries. I have looked at Pearson's correlation...

• Replies: 0
• Views: 1,229
03-21-2016, 02:32 PM
38. ### Creating a statistical dataset within specified parameters

Hi, Got an assignment due this week and stumped on this one question: I need a dataset: x = −5, s = 1, g = 0 and k = 0 Where x= mean,...

• Replies: 1
• Views: 2,001
03-21-2016, 08:44 AM
39. ### Statistical testing for part of total return

Hey guys, I am doing an M&A event study, where I've distinguished two types of mergers. As a next step, I have calculated the total return following...

• Replies: 0
• Views: 1,200
03-20-2016, 05:29 PM
40. ### i need help in some research work.

i need to write some research paper i need help in that matter can someone please help topic is Analysis of Variance in Normality ( based on...

• Replies: 5
• Views: 2,170
03-20-2016, 11:43 AM
41. ### 25th percentile of right-skewed and left-skewed distribution

Hi All, Is it possible to have two lists of numbers with the same number of elements and same average, where one has a left-skewed distribution and...

• Replies: 0
• Views: 1,193
03-19-2016, 04:52 PM
42. ### Which test to use for testing normality?

Hi, I need to help to choice of test for normality. I have a really large dataset which contain aproximately 180 000 observations and 5 variables...

• Replies: 5
• Views: 1,777
03-19-2016, 03:16 PM
43. ### Z-Confidence Interval Procedure

Say we are trying to estimate a population mean by using a confidence interval when the population standard deviation is known, hence a Z interval...

• Replies: 1
• Views: 1,294
03-19-2016, 11:27 AM
44. ### sawtooth crash pattern detection

I am working on some gaming playing data, and want to detect the sawtooth crash pattern (which means the player has a sharp drop in gaming wager...

• Replies: 1
• Views: 1,180
03-18-2016, 10:55 PM
45. ### Reverse Scoring in SPSS

Hi! I'm currently doing data analysis on a study I've had to conduct for my degree coursework. We've used 2 questionnaires and I will be doing a...

• Replies: 0
• Views: 2,935
03-18-2016, 09:47 AM
46. ### Homogeneity of variances violated for two-way ANOVA, Brown-F & Welch's tests done...

But the Brown-Forsythe and Welch's tests cannot be performed because "at least one group has the sum of case weights less than or equal to 1. What...

• Replies: 4
• Views: 1,997
03-18-2016, 09:42 AM
47. ### Probability formula quiz

Which of the 24 formulae below represents the probability that all k genes are mutant in at least 1 person, where: n = number of people (sample...

• Replies: 3
• Views: 1,386
03-17-2016, 07:47 PM
48. ### Power of Two (Ordering Policy)?

The optimal time between replenishments, T*, is found to be 5.9 weeks. Using a week as a base unit of time and following the Power of Two Policy,...

• Replies: 0
• Views: 3,231
03-17-2016, 02:34 PM
49. ### What would you classify an "operational decision" for a DC?

You run a distribution center that distributes different brands of cell phones to retailers in the area. You need to tackle inventory decisions that...

• Replies: 2
• Views: 1,632
03-17-2016, 02:26 PM
50. ### Unique Solution.

Is the following statement true that : "To get unique solution of each parameter in a model, number of equations must be greater than or equal to...

• Replies: 1
• Views: 1,289
03-17-2016, 02:13 AM

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