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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: 196,581
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: 66,632
09-30-2005, 09:44 AM
1. ### Chi Squared Distribution using R

Hi. How do I calculate P (1<x<4) for a chi squared distribution with degrees of freedom = 3 using R Programming ? What commands in R should I use...

• Replies: 4
• Views: 2,233
09-19-2014, 08:04 PM

hi :wave: i have 2 surveys. The data is collected from both managers and subordinates, the first one has just one variable (moderator) and the 2nd...

• Replies: 2
• Views: 1,512
09-19-2014, 07:18 PM
3. ### Can You Stat Test CVs?

I am looking at survey data of users of a specific product type. Within the data set, I am looking at overall rating scores, which is derived from a...

• Replies: 0
• Views: 1,256
09-19-2014, 01:08 PM
4. ### Standard Error Calculation in DOE Screening

Hello everyone, im working right now on a DOE Screening, and was trying to understand how the program calculates the Standard Error. It doesnt use...

• Replies: 4
• Views: 1,844
09-19-2014, 09:08 AM
5. ### Non-Parametric Analyses. Report medians and 95% CI in graphs?

Okay so, I'm currently writing my thesis, and I have to do non-parametric tests. I know that I have to report the medians in text. However, I'm...

• Replies: 4
• Views: 1,883
09-19-2014, 01:26 AM
6. ### Question about histogram construction

Hello. I know this may be an obvious answer, but my instructor has given me this question Part I. The following twenty data are the yields of the...

• Replies: 5
• Views: 1,743
09-17-2014, 09:25 PM
7. ### Confidence interval help needed

Hey guys, Its been a while since I did a CI so I am a bit rusty. I had 19 steel pins which all had an actual diameter of .375 in, so mean is...

• Replies: 4
• Views: 2,078
09-17-2014, 06:58 AM
8. ### Hypothesis test for the difference of the difference of means??

Hello all, Consider 3 different samples. Each sample is independent. 1: 23, 25, 21, 22, 21, 22, 20, 23, 19, 22, 19, 21 2: 28, 27, 27, 29,...

• Replies: 1
• Views: 1,560
09-17-2014, 12:13 AM
9. ### Z Scores - Can I calculate an average on 2 Z-scores or should it be on raw data?

Hi there, I have a series of Z-scores that are calculated twice for a single subject (they are similar but taken at 2 different times). But...

• Replies: 1
• Views: 1,462
09-16-2014, 10:56 AM
10. ### Correlation with categorical control variables - which test to use?

Hi, I’m looking for some help in choosing the right statistical test for my research objective. I am new to statistics, so let me describe what...

• Replies: 0
• Views: 2,314
09-16-2014, 09:27 AM
11. ### Is this variance for grouped data??

Apologies for the newb question... it'll probably seem extremely obvious but I struggle with math and my exam is tomorrow... My tutor wrote down...

• Replies: 2
• Views: 2,426
09-15-2014, 07:45 PM
12. ### Confidence interval for Kendall's Tau-C

Hi, I am conducting a Kendall's Tau-C correlation test (in SPSS), and I was wondering if there is any software or instructions on how to create a...

• Replies: 2
• Views: 5,296
09-15-2014, 07:17 PM
13. ### Real Life Problem - Removing Outliers from a large dataset of continuous data

Hey there, I started a job recently and found myself working with data that has outliers. They need to be thrown out using microsoft access or...

• Replies: 1
• Views: 2,032
09-15-2014, 05:33 PM
14. ### variable type and level of measurements

Hello all There are 4 levels of measurement I am aware of: Nominal, Ordinal, Interval and Ratio. I am trying to find the connection of the...

• Replies: 5
• Views: 2,101
09-15-2014, 05:01 PM
15. ### normal distribution

Please help me to solve the problem Let Y1, Y2, . . . , Y9 be a random sample of size 9 from a normal distribution where μ = 2 and σ = 2. Let Y ∗...

• Replies: 1
• Views: 1,453
09-15-2014, 12:01 PM
16. ### Considerable controversy

Please guide me to solve the problem. Actually I cannot understand where to start and where to end and what to solve out? Considerable controversy...

• Replies: 1
• Views: 3,424
09-15-2014, 12:00 PM
17. ### Compare results of a repeated survey if respondents weren't 100% the same each time?

Hello, I have spent many days trying to figure out how to analyze the difference in responses to a survey that was taken 3 times (pre-educational...

• Replies: 0
• Views: 1,443
09-15-2014, 11:30 AM
18. ### RM ANOVA vs. ANCOVA question

Hi stats friends! I'm trying to decide whether to use an RM ANOVA vs. an ANCOVA to test a question and I could use your help. Participants were...

• Replies: 0
• Views: 1,276
09-15-2014, 09:38 AM
19. ### Theory Question - Purpose of Bootstrapping when we have the CLT?

Hi all, This may just be a case of me miss-understanding the CLT, BUT: If from the CLT we can deduce that the SE of a sample statistic is...

• Replies: 2
• Views: 1,539
09-15-2014, 03:57 AM
20. ### Contextual Effect Question

I am looking for general thoughts on the following circumstance. I am working on a problem for a colleague in which he has some outcome Y at T2...

• Replies: 1
• Views: 1,778
09-15-2014, 12:11 AM
21. ### covariance between two observations belonging to the same block

Hi, does anyone know how to find the expression for the covariance between two observations belonging to the same block for a balanced complete...

• Replies: 2
• Views: 1,486
09-14-2014, 04:54 PM
22. ### Dissertation Correlation Course Selection with Locus of Control

Is there a statistically significant difference in the locus of control of students who select online versus traditional classroom format? I am...

• Replies: 1
• Views: 1,159
09-13-2014, 02:45 PM
23. ### Probability problem

As per my calculation the answer is 50*.4382 = 21.91 or 22 in approx. Please guide me whether I am right or wrong. Please help me to solve the...

• Replies: 1
• Views: 3,092
09-13-2014, 12:13 PM
24. ### How to set up Friedman test, based off of data from a series of anonymous surveys?

I was asked to run a Friedman test off of a survey taken three times (Time 1, Time 2, and Time 3) on one and the same population. My study...

• Replies: 2
• Views: 1,369
09-13-2014, 12:06 PM
25. ### Selecting subgroup with given mean and standard dev. below given value

I have a group of subjects with variable age and I would like to select a sub-group with given number of subjects where all selected subjects have...

• Replies: 0
• Views: 1,407
09-12-2014, 04:26 PM
26. ### ICC for inter-rater agreement for categorical data?

hi there I conducted a study were 2 raters assessed image quality on a 1-5 scale (1,2,3,4,5) (categorical data). A reviewer now suggests to add...

• Replies: 2
• Views: 2,915
09-12-2014, 12:11 PM
27. ### Type II Error problem in hypothesis testing

I have tried to solve the problem many times, as the follows:::=> P(type II error|μ = 220)= p(z < (240-220)/10)) = .0228, Please confirm me...

• Replies: 1
• Views: 1,718
09-11-2014, 10:50 PM
28. ### How to re-rank scores by creating a multiplier from an average

A study was done in which 200 cities were ranked for safe driving according to the number of accidents that occurred in each city. It's the report...

• Replies: 0
• Views: 1,859
09-11-2014, 03:27 PM
29. ### Using range instead of standard deviation?

In what circumstances would it be better to use the range than the standard deviation?

• Replies: 10
• Views: 3,432
09-11-2014, 03:21 PM
30. ### Z score per Class or Z score across all classes

Hi, I have been trying to understand Z score to normalize and pick the top 15% of students in a school with 5 grades. Student in each grade is...

• Replies: 0
• Views: 1,555
09-11-2014, 02:37 PM
31. ### Calculating correlation with unknown sample size

Hello, friends. Here is the question that I would like answered. I have literally been sitting here for over an hour trying to find the solution on...

• Replies: 2
• Views: 5,486
09-11-2014, 01:12 PM
32. ### How to find hidden patterns in data that seem chaotic?

Hi guys, please forgive if this is too trivial problem. However all my statistics knowledge is limited to excel and SPSS. And I can't seem to figure...

• Replies: 7
• Views: 1,997
09-11-2014, 05:16 AM
33. ### Data Mining Tools for Panel Data

Hi, I have a panel data which includes years 2009 to 2013. I want to use SPSS Clementine to analyze this data. Which data mining tools should ı...

• Replies: 0
• Views: 733
09-10-2014, 11:04 PM
34. ### Predicting a Finite Sequence of Events

Hello everyone, I have very little experience with statistics, but I have a general problem that I think it might be applicable to. My primary...

• Replies: 1
• Views: 995
09-10-2014, 03:47 PM
35. ### Overlapping sample: t test with partial pairing??

Hi - I've a work project that requires a stat test between Product A and Produce B performance ratings (On a scale of 1 to 5 how well did Product...

• Replies: 4
• Views: 3,066
09-09-2014, 10:25 AM
36. ### GLM with non-parametric post hoc testing?

Hi guys, I have a question regarding the appropriate use of comparisons for independent samples (3 factor levels), please. Overall sample size is...

• Replies: 1
• Views: 1,373
09-09-2014, 07:51 AM
37. ### Which statistic test to use?

I will like to make a statistic analysis on some data but do not know which test to use. My data is listed below (I have 3 treatments and one...

• Replies: 4
• Views: 2,159
09-09-2014, 01:55 AM
38. ### Which is more reliable? A Z-test (skewness and kurtosis) or Shapiro-Wilk?

Hello! New member with a question :) I am testing my dependent variables for normality, and I am running several methods for it.. For "visual"...

• Replies: 5
• Views: 2,355
09-08-2014, 01:01 PM
39. ### Regular Sampling

hi, I had the following question and I really wonder if I gave the right answer: Assume that you can measure a process once a day ( for the sake...

• Replies: 6
• Views: 2,027
09-08-2014, 09:53 AM
40. ### Estimating Overall Portfolio Standard Deviation

Is it possible to estimate the standard deviation of the combined portfolio of the following: - 20 assets; - where each asset has an annual...

• Replies: 1
• Views: 1,254
BGM
09-08-2014, 02:56 AM
41. ### stats

• Replies: 2
• Views: 1,253
09-07-2014, 09:34 PM
42. ### Needd Help Choosing Test : More than Two Proportions using SPSS

New in Statistics: Help needed to choose the Correct Test: ( maybe Chi-square): I have following information: Type1 Type2 Type3 Type4 ...

• Replies: 11
• Views: 3,389
09-07-2014, 11:15 AM
43. ### standard deviation of multiple sample sets

I'm trying to determine the standard deviation of multiple sample sets (measurements A, B, C taken on 3 different days), for which I know the means...

• Replies: 15
• Views: 99,490
srk
09-07-2014, 01:28 AM
44. ### conduct a chi-squared test on 5point likert scale questionnaire

Is it possible to conduct a chi-squared test on 5point likert scale questionnaire? If it is possible, please mentioned the procedure. Your early...

• Replies: 0
• Views: 2,708
09-07-2014, 12:44 AM
45. ### Permanova + T-test

Hello, I have a question regarding the data analysis listed below. I am trying to run a similar study but I can't truly understand why a PERMANOVA...

• Replies: 3
• Views: 2,651
09-06-2014, 05:38 PM
46. ### Proper name for scores calculated via formula

Often in my field folks will take various count data and apply some formula to input different information and output some sort of summary. An...

• Replies: 6
• Views: 1,727
09-06-2014, 01:11 PM
47. ### Confidence interval of mean of queue length (M/M/1)

Goodday, For a simulation course I had to simulate a single server queue with Poisson processes for arrival and departure (M/M/1). Now, this...

• Replies: 3
• Views: 2,382
09-06-2014, 09:09 AM
48. ### Need some help in application of stats

Dear all I have some data which I want to discuss with you and if possible someone can help in doing power analysis for this data? I have two...

• Replies: 0
• Views: 1,214
09-05-2014, 03:18 PM
49. ### Buying a big ticket item and calculating "goodnes of deal"

Hey all, so if you've followed any of my posts, you know I am thinking of buying a bigger rig. I am talking to everybody in my state and dealing...

• Replies: 1
• Views: 1,079
09-05-2014, 11:02 AM
50. ### Age as a Dependent variable in 2-way ANOVA?

Hi, I have a dataset comprising of Ages and Genders of patients in two WardUnits. I want to determine if patient Ages differ by WardUnit and...

• Replies: 9
• Views: 2,529
09-05-2014, 10:33 AM
51. ### Weights for weighted mean: Do these weights make sense?

I'm attempting to weight a mean to make outliers less impactful. I know people use a median here often but am looking to try to make a mean that's...

• Replies: 8
• Views: 2,127
09-04-2014, 12:58 PM
52. ### Pearson vs Spearman correlation: Which to use in measurement data

Hi everyone, I have a data set of measurements that I would like to test for a correlation with. However, I am unsure whether I want to use a...

• Replies: 0
• Views: 1,459
09-04-2014, 10:46 AM
53. ### Calculating effect size

Hi, I'm just wondering what would be the best way to calculate effect size in this situation: I have three groups all with unequal sample sizes...

• Replies: 1
• Views: 1,213
09-04-2014, 10:04 AM
54. ### Which statistic function should I use for comparing two data sets

A quick example of what I am trying to do: Sample 1: Red - 10 Yellow - 20 Green -15 Sample 2: Red - 8 Yellow - 7 Green - 0

• Replies: 0
• Views: 1,186
09-03-2014, 02:25 PM
55. ### Difference between standard deviation and standard error

Hi, what exactly is the difference between the SD and SE? I read through the wikipedia article but dont really understand the difference. Can...

• Replies: 8
• Views: 177,173
09-03-2014, 11:48 AM
56. ### Finding similar numbers in multiple data sets

Hi there. Hopefully I can explain my question correctly. Let's say I have three columns with some numbers as follows as follows: Column 1: 2, 3,...

• Replies: 0
• Views: 1,606
09-03-2014, 09:53 AM

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