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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: 197,168
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: 66,955
09-30-2005, 09:44 AM
1. ### Average Tenure and Employee Attrition

Hi All, My company's attrition rate is about 25%. A senior member of the organization believes that because the attrition rate is 25%, this means...

• Replies: 0
• Views: 2,593
11-25-2012, 06:09 AM
2. ### Help with inter-rate reliability calculation with multiple raters and nominal data

I have 12 raters. Each of them is going to rate if a patient needs a certain diagnostic test. The answer is yes or no. I would like to calculate the...

• Replies: 0
• Views: 1,937
11-24-2012, 11:01 PM
3. ### Help finding probability with sample mean & standard deviation

Can anyone help me on how to do this problem? I'm so confused

• Replies: 2
• Views: 2,130
11-24-2012, 10:00 PM
4. ### Please assist with this question?

In a recent survey by the Miami Mental Health Clinic, Miami's general population prevalence mental health illnesses yielded the following data: 21...

• Replies: 2
• Views: 1,778
11-24-2012, 09:45 PM
5. ### Assess hedonic regression

Hi, I'm going to be involved in an asssignment using hedonic regression on real estate appraisal. It is a part of an index for dwellings. My task...

• Replies: 1
• Views: 1,388
11-24-2012, 05:18 PM
6. ### regression output

dear all, if the t statistic is between +2 and -2, does it always mean that there is no relation between the two variables in the regression...

• Replies: 0
• Views: 1,129
11-24-2012, 05:10 PM
7. ### Not sure what I'm being asked!

Hi all! I'm wondering if someone could help clarify a question in my stats assignment. I am quite confused about what I am being asked to do! ...

• Replies: 0
• Views: 1,178
11-24-2012, 04:09 PM
8. ### Kruskal Wallis or One way analysis of variance- which is more suitable?

Hello, I am currently working on an assignment which describes 2 clinical trial scenarios. I will outline both first: 1)Compare the...

• Replies: 7
• Views: 1,634
11-24-2012, 01:59 PM
9. ### Doing a stats assignment with R. Would love some advice on what stats tests to run

We've been given data for 9 different genomes of fruitfly. These have then been split into 3 groups based on their overall effect on the fly's...

• Replies: 21
• Views: 3,334
Cam
11-24-2012, 12:22 PM
10. ### Durbin-Watson of 1.97

Hi there, I ran the Durbin-Watson test for my dataset. n = 744 (sample), k = 9 (variables) My result is a DW of 1.97. SPSS does not show...

• Replies: 6
• Views: 1,968
11-23-2012, 06:31 PM
11. ### P1 Exam Practice Update

I now have a 10 question 1 hour practice test and a 20 question 2 hour practice test... I am working on creating some online practice tests to...

• Replies: 0
• Views: 1,152
11-23-2012, 04:15 PM
12. ### Data mining MS SQL 2012 vs. statistics in SPSS

Guys! I'm doing a research about factors correlated with AV fistula (dialysis blood approach). I have 195 cases and used them for data mining with...

• Replies: 0
• Views: 2,529
11-23-2012, 04:14 PM
13. ### Analyzing data. Unsure which test to use

It has been a LONG time since my last stat course. Working on an experiment with a student in my science class who is looking at the effects of trace...

• Replies: 1
• Views: 989
11-23-2012, 01:00 PM
14. ### Population testing - Suitable Tests?

Problem solved :-) Thanks.

• Replies: 1
• Views: 798
BGM
11-22-2012, 04:50 PM
15. ### Chi square and relative risk

Hi, I am using Chi Square to test if two variables are associated with each other, I am also calculating the relative risk. Howver, does it...

• Replies: 0
• Views: 3,045
11-22-2012, 04:24 AM
16. ### Detecting outliers in Negative Binomial Regression

Hi all! I am conducting a negative binomial regression for my statistics project. I have been looking online about how to detect outliers but am...

• Replies: 2
• Views: 4,579
BGM
11-22-2012, 03:30 AM
17. ### Which test should I use? Categorical variable vs continuous

Hi! I have a set of data with the heights of individuals, and each individual is associated with a categorical variable (success/failure). I want...

• Replies: 5
• Views: 937
11-21-2012, 09:53 PM
18. ### P1 Exam Practice

I am trying to make an online practice exam for people preparing for the p1 actuarial exam. I just set something up and I hope some of you may be...

• Replies: 2
• Views: 1,550
11-21-2012, 03:04 PM
19. ### Need some advice on normality and tests

Hi, First I would like to thank you for this wonderful forum with lots of useful information :) I have two samples for which I'm trying to...

• Replies: 15
• Views: 3,575
11-21-2012, 02:32 PM
20. ### Show that a sample size is too small for reliable results?

Hi, I have a simple question about sample sizes I was hoping someone could help me with: A test subject drinks from 4 different glasses of water...

• Replies: 9
• Views: 3,370
11-21-2012, 02:05 PM
21. ### Binomial GLM- Remove one variable to see effect of another?

For my assignment, we've essentially been given data on flies with 3 variables: Genome, Wing size, Mating outcome. We have a range of genomes, and...

• Replies: 0
• Views: 790
Cam
11-21-2012, 12:36 PM
22. ### Which test do I use?

Hi, I'm struggling to figure out exactly which test I should use to test the following data: Group N % Low 203 50.09 Medium...

• Replies: 2
• Views: 1,129
11-21-2012, 11:43 AM
23. ### How many subjects are between X and Y cm tall?

I have a group "G" of unknown size containing height values for men. I've been working with a sample from this group, and now I get the question: ...

• Replies: 4
• Views: 1,540
11-21-2012, 11:18 AM
24. ### How do you find a 90% confidence interval???

Independent random samples of n1 = 600 and n2 = 430 observations were selected from binomial populations 1 and 2, and x1 = 333 and x2 = 376 successes...

• Replies: 1
• Views: 2,701
11-21-2012, 08:43 AM
25. ### Testing for similarity vs dissimilarity

Hi all, I'm a grad student who uses stats a lot but who has very little formal training. Not sure if this is in the right forum, so feel free to...

• Replies: 11
• Views: 3,373
11-21-2012, 08:37 AM
26. ### Subtract a known inaccuracy

I'm stuck on a statistics problem that I'll use an example to describe. A person is hired to measure the length of 50 people. Because he's sloppy...

• Replies: 1
• Views: 1,079
BGM
11-21-2012, 05:01 AM
27. ### spss..comparing means

I spent 50 hours on this project , polished it, shined it and escorted it to my professor only to find I mismanaged what i thought was the easiest...

• Replies: 1
• Views: 959
11-20-2012, 10:36 PM
28. ### 2 way ANOVA, multiple response variables.

Hello everyone, I would like to perform a 2-factor anova test, but I have some doubts. I'm working with mice in which we assess multiple...

• Replies: 2
• Views: 4,120
11-20-2012, 05:59 PM
29. ### Quick question on reporting statistics on 2x2 ANOVA

Hey guys! I just have a quick question regarding whether I've reported everything I need to for a 2x2 ANOVA. You can skip the description if it's too...

• Replies: 0
• Views: 2,145
11-20-2012, 04:46 PM
30. ### Hypothesis Testing Question Help

I've been lurking for some time now, soaking up knowledge, but now I'm stuck on finding p-values for the following question. Q: A board game...

• Replies: 11
• Views: 2,880
11-20-2012, 04:37 PM
31. ### Error on the standard deviation, skewness & Kurtosis

Dear all, Given a sample of N points extracted from a distribution, I would like to know how to estimate the error on the higher moments of the...

• Replies: 3
• Views: 4,299
BGM
11-20-2012, 05:50 AM
32. ### How do you find the population mean?

Find a 90% one-sided upper confidence bound for the population mean μ for these values. (Round your answers to two decimal places.) (a) n = 34,...

• Replies: 1
• Views: 2,975
11-19-2012, 09:29 PM
33. ### combining estimate moe and translating into percentage

Hey all, This is my first post, sooo glad I found you guys. All the information has been invaluable to me. I spent 15 mins or so trying to search...

• Replies: 3
• Views: 2,325
11-19-2012, 03:27 PM
34. ### Standard deviation of Sample vs. Standard deviation of mean

Hi, I have a very basic confusion. What exactly is the difference between them? Can you also give a simple example? Thanks guys

• Replies: 0
• Views: 1,062
11-19-2012, 02:35 PM
35. ### t-test vs. chi-square test; Sampling Size for educational study (Cochran equation)

Hi there, I had a few questions relating to statistics in my study. I am a bit of a noob in stats so bear with me... The goal of my project is...

• Replies: 0
• Views: 2,712
11-19-2012, 04:53 AM
36. ### Help explaining median!

Good morning, I'm currently speaking with members of the management at my place of work regarding a new method of measurement at my place of work....

• Replies: 1
• Views: 1,915
11-18-2012, 07:25 PM
37. ### Supposedly easy question

Hi guys, I've been struggling with this supposedly easy question. I wonder whether you can help me with it. I ran an experiment with a...

• Replies: 1
• Views: 1,053
11-18-2012, 05:52 AM
38. ### Question regarding log transformations.

I am doing a statistics project for my class and the question reads as follows: "Fit a linear model that could be used to answer whether or not a...

• Replies: 1
• Views: 1,424
11-17-2012, 06:46 PM
39. ### Urgent simple question re One Way vs. Univariate ANOVA

Hi. I'm trying to decipher some SPSS output. Using syntax, it ran a Univariate ANOVA. My question is, is this the same thing as a One Way ANOVA?? ...

• Replies: 3
• Views: 6,332
11-17-2012, 06:42 PM
40. ### Between Subjets Test Help

Hi there, I am examining digit span and gist memory in older and younger groups, and also comparing groups on education level to see that has an...

• Replies: 0
• Views: 1,037
11-16-2012, 07:02 PM
41. ### Binomial Distribution

I am in dire need of some help with binomial distribution! In a given year, the probability that an adult American male dies in a car accident is...

• Replies: 0
• Views: 1,382
11-16-2012, 03:45 PM
42. ### Predicting Daily Revenue

Hello -- first posting, I would greatly appreciate your help. I work for a smallish company that is very good at tracking data, but not so good at...

• Replies: 0
• Views: 1,739
11-16-2012, 12:17 PM
43. ### Spearman correlation & Bonferroni test‏

Hello, I would like to ask your opinion about a stat test. I have computed a Spearman correlation between 13 variables (computing two variables at a...

• Replies: 1
• Views: 32,810
11-16-2012, 09:41 AM
44. ### help me to identify the no of employees i should use for my research

I am supposed to do a project on employee turnover and particular company have 500 employees and their annual turnover is 12%. I need to know no...

• Replies: 2
• Views: 2,165
11-16-2012, 04:01 AM
45. ### Parasite data - currently using generalized linear models - which test to use?

Hi, I have a problem deciding which approach to take towards my data. I am doing a small research project in which I check if the diet of Herring...

• Replies: 0
• Views: 1,498
11-16-2012, 03:54 AM
46. ### Nested Data - is mixed effects modeling appropriate here?

Hi! I'm trying to determine the most appropriate way to analyze a data set which comes from a nested experimental design. The basic setup is...

• Replies: 4
• Views: 1,567
11-16-2012, 02:08 AM
47. ### Finding the time-to-failure of a lightbulb?

How would I find the time-to-failure of a lightbulb with a z-score of 1.25? I'm not sure what formula I would use... I'm also given the mean, the...

• Replies: 0
• Views: 1,219
11-15-2012, 10:16 PM
48. ### What to do with this data

HI I've complied this data 2012 2011 2010 2009 2008 2007 2006 2005 1ST 10.32 10.32 10.35 10.38 10.31 10.27 10.44 10.46...

• Replies: 1
• Views: 1,203
11-15-2012, 07:21 PM
49. ### Simple clarification needed for normal distributions and z-scores

This is definitely a really dumb question, but it'd really help me out if someone could explain this to me. What is the difference between P(0 \leq Z...

• Replies: 3
• Views: 1,041
11-15-2012, 04:06 PM
50. ### Stupid question: deriving standard dev from mean, C.I., and sample size

So I'm trying to get a standard deviation value for a table of statistics that includes a mean, a 95% confidence interval, and a sample size. I am...

• Replies: 1
• Views: 1,403
11-15-2012, 03:23 PM
51. ### Chi-Square GOF test results appear to change with size of sample

Hi, I have not been able to find anything related to this topic on the web or on this site. I am not even sure what words to use in the search. So,...

• Replies: 2
• Views: 1,610
11-15-2012, 02:31 PM
52. ### Using probit model

Could anybody explain to me how to work with a model based on probit analysis? I have for example a model like this: Z=-2,067-2,324x+3,213y+1,782v...

• Replies: 0
• Views: 1,072
11-15-2012, 02:17 PM
53. ### How To Reject Null When Unequal Samples? Should I Use Welch's, ANOVA or What?

Hello, I am in the 7th grade, working on a science fair project. I engineered an electronically enhanced vision device, which I call "XYZ...

• Replies: 0
• Views: 1,840
11-15-2012, 09:04 AM
54. ### Comparing Survey Results

I just recently administered two surveys testing the effectiveness of a product. Each survey consisted of the same 3 questions and were answered on a...

• Replies: 0
• Views: 3,683
11-14-2012, 10:28 PM
55. ### Sample Size

Can you give a simple example on how to calculate sample size? What are the central ideas to understand this? Please help

• Replies: 0
• Views: 869
11-14-2012, 04:54 PM
56. ### Redistributing Budget

I need to redistribute our budget based on what is left for the year. I am not allow to change our total budget number. FYI our fiscal year is July...

• Replies: 0
• Views: 1,071
11-14-2012, 03:24 PM
57. ### Simple Logistic Regression Help

333333333333333333333

• Replies: 4
• Views: 1,276
11-14-2012, 03:03 PM
58. ### How to prove a non negative definite matrix has to be a variance-covariance matrix?

I know this is a iff condition,and the reverse is easy to prove.But I am having some difficulty to prove that all non negative definite matrices are...

• Replies: 4
• Views: 1,669
11-14-2012, 02:09 PM

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