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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: 196,702
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: 66,727
09-30-2005, 09:44 AM
1. ### p-value method

I am having trouble with this question, I am a little confused about the 'p-value approach'. I thought that I should find the pooled variance and...

• Replies: 0
• Views: 3,620
11-22-2008, 04:45 AM
2. ### Hypothesis testing, t-test?

First post, and yes it's homework help, I'm just drawing a complete blank as to how to approach this: Our prof has said that we always make...

• Replies: 0
• Views: 3,101
11-21-2008, 05:13 PM

Hi All, I have a question from my boss I just cannot answer. In my job, we have a 6% decrease of injuries on the workforce in our data. The...

• Replies: 1
• Views: 2,352
11-21-2008, 04:55 PM
4. ### non-parametric two way ANOVA

Hello, I'm so glad i found this site! I am wondering whether anyone knows of what non-parametric test i could use as equivalent to a two way...

• Replies: 7
• Views: 24,929
11-21-2008, 11:41 AM
5. ### GLM Gamma Assumptions

Hi Everyone- When fitting a generalized linear model - say a log link and gamma distribution (errors), would one substitute the linear regression...

• Replies: 1
• Views: 4,905
11-21-2008, 08:30 AM
6. ### Unit Root

Hello, I am required to test for a unit root using EViews statistical package. To do so I am using an Augmented Dickey-Fuller test. The package;...

• Replies: 0
• Views: 3,799
11-21-2008, 03:18 AM
7. ### Help with this one, please?

Suppose certain coins have weights that are normally distributed with a mean of 5.358 g and a standard deviation of0.052 g. A vending machine is...

• Replies: 3
• Views: 8,364
11-21-2008, 01:03 AM
8. ### help with pearson problem

Hi. I have a homework with a bunch of different problems that are not identified. Our job is to identify if they are pearson or spearman then...

• Replies: 0
• Views: 2,220
11-20-2008, 11:48 PM
9. ### your opinion on a statistical procedure with ANCOVAs

Hello, I was wondering if you could tell me whether you agree with this statistical analysis for my school paper. I have 3 groups with demographic...

• Replies: 2
• Views: 1,994
11-20-2008, 09:56 PM
10. ### How can I go deeper into ANOVA?

I am doing some research on office work and where people look at work. I have one independent variable with four different levels, that is I had...

• Replies: 1
• Views: 1,916
11-20-2008, 09:20 PM

hello guys i need your help with these questions,these are test review questions and i started to solve them but i need second thought on them....

• Replies: 4
• Views: 3,545
11-20-2008, 07:35 PM
12. ### Finding P-value based on hypothesis

Hey guys, so I'm not really good at math and I need some help understanding this problem if anyone would be so kind so help me with it. Null...

• Replies: 0
• Views: 1,968
11-20-2008, 05:36 PM
13. ### p-value measurement

Hi prospectively helpful folks, My gratitude for anyone who can help me, a statistics novice educated in the last hour by Wikipedia and other...

• Replies: 2
• Views: 2,579
11-20-2008, 04:02 PM
14. ### Fitting a model with poisson errors to data with normal errors

Hi, As part of my research, I am having to fit data, which has normal errors, with a model. Until now, I have been assuming that the model values...

• Replies: 0
• Views: 3,074
11-20-2008, 03:51 PM
15. ### When to use 5pt vs. 7pt Likert Scale?

I am working a survey for physicians, and am planning on utilizing a Likert Scale for an assessment. I've heard different things from a few...

• Replies: 4
• Views: 10,485
11-20-2008, 03:07 PM
16. ### Proper syntax in peer reviewed papers

Hi, I have a question about how to properly write statistics in a peer reviewed scientific (non statistical) paper. If you were to say, 'such and...

• Replies: 1
• Views: 1,916
11-20-2008, 03:05 PM
17. ### What test to use?

Hello! Can anyone enlighten me on this one. I am supossed to answer the following questions for an exam: 1. Does taking an SAT preparation...

• Replies: 2
• Views: 1,791
11-20-2008, 10:19 AM
18. ### A question regarding the size of a sample

Hello everyone! these days I am working with seemingly unrelated regression to improve the efficiency of my results. Now, I am wondering how...

• Replies: 0
• Views: 1,786
11-20-2008, 09:20 AM
19. ### Probability question- Help Im stuck

Question: A group of 100 people exhibited the following blood types: A20 B24 AB10 O46 If one person is selected at random, what is the probability...

• Replies: 1
• Views: 2,802
11-20-2008, 07:50 AM
20. ### Studentised range value

Hi, I am part of the way through conducting a Tukey hsd test and now require my studentised range critical value (qt). My problem: My df's and...

• Replies: 4
• Views: 4,144
11-19-2008, 04:05 PM
21. ### What Statistical Test do I use?

Can someone please help... I need to test my research hypothesis by having SPSS conduct the appropriate statistical analysis, the problem is I am...

• Replies: 5
• Views: 2,569
11-19-2008, 03:29 PM
22. ### beginner, very quick question!

Hello, isn't it always the way you get work and crash at the first hurdle.. I'm estimating an equation using data that is already in log form -...

• Replies: 0
• Views: 1,856
11-19-2008, 10:29 AM
23. ### Using normal to approximate binomial

"After changing to newer healthier food oils, the company claims that 97 out of 100 people cannot detect a difference in taste between the new and...

• Replies: 1
• Views: 7,925
11-19-2008, 09:23 AM
24. ### Regression Analysis

I am writing a report for my Key Skills Tutorial and the instructions specifically ask me to use regression analysis for the data i was provided. ...

• Replies: 4
• Views: 2,728
11-19-2008, 05:18 AM
25. ### Comparing rank orders

OK ... I have a 15 items overall ... I have two lists of 10 items (column A and column B) Some items do not appear in column A, and some do not...

• Replies: 0
• Views: 3,022
11-18-2008, 05:58 PM
26. ### Sampling from variables with known probability distribution functions

Greetings, everyone! Here comes another of my irritating questions, divided in parts. Help will be greatly appreciated... 1. Let us presume that...

• Replies: 0
• Views: 2,554
11-18-2008, 09:00 AM
27. ### Ti 84 and weighted descriptive stats

Hi Im really gettin frustrated here and I know some amazing person will help. I have a class where i constantly get problems like this: ...

• Replies: 9
• Views: 4,631
11-18-2008, 08:03 AM
28. ### what formula do you use

The mean length of stay of Employees in a dangerous industry is 16.7 months. One hundred randomly selected employees at my brothers cafe had a mean...

• Replies: 3
• Views: 3,954
11-18-2008, 12:35 AM
29. ### Estimation and confidence intervals questions?

Hi there! I'm new here, and have a few questions concerning the last few chapters we've been covering in my intro to stats course. I'm absolutely...

• Replies: 1
• Views: 2,618
11-17-2008, 10:14 PM
30. ### Regression advice needed for power technology cost analysis

Hi, As part of a project we need to do an analysis of the capital costs of different technologies that exist across the power spectrum - such as...

• Replies: 0
• Views: 2,244
11-17-2008, 07:21 AM
31. ### Which test to use?

I have a very small dataset of proportions. Which test would I use to compare 3 values for one group to 3 values for another group? My data looks...

• Replies: 0
• Views: 1,425
11-17-2008, 03:55 AM
32. ### chi-squared appropriate?

I am working on a project trying to determine the likelihood of recurrence of an ocular disease in a sample of 50 patients. I'm new to statistics...

• Replies: 0
• Views: 1,854
11-17-2008, 01:08 AM
33. ### Independence or homogeneity?

I am confused if these two problems are either independence or homogeneity: 1. data is given to us that shows levels of education attained by age...

• Replies: 1
• Views: 2,241
11-16-2008, 11:39 PM
34. ### Question regarding Single waiting line and Multiple waiting lines at the banks

The listed values are waiting times (in minutes) of customers. Bank A (Single waiting line) 6.5, 6.6, 6.7, 6.8, 7.1, 7.3 7.4, 7.7, 7.7, 7.7...

• Replies: 0
• Views: 2,990
11-16-2008, 04:52 PM
35. ### Goodness of fit (particular problem)

The following table shows the distribution of weekly salaries for samples of 100 women and 100 men in a large company. Salary...

• Replies: 1
• Views: 2,173
11-16-2008, 04:31 PM
36. ### What are the benefits of Variance and Standard Deviation

Dear Friends, Please let me know the benefits of Variance and Standard Deviation. What all, I can do using Variance and Standard Deviation. How...

• Replies: 4
• Views: 18,348
11-16-2008, 11:03 AM
37. ### Difference between one-tail and two-tail t test

Hey I am a newbie here. Think in real simple terms. I am having trouble understanding the differnece between one-tail and two-tail t tests....

• Replies: 2
• Views: 10,713
11-16-2008, 09:55 AM
38. ### Error calculation for best fit line

I have a question regarding the calculation of errors from a line of best fit in log space. At the moment the errors I am getting seem unreasonably...

• Replies: 0
• Views: 5,822
11-16-2008, 08:29 AM
39. ### Correlation

I have 2 sets. I formed 5000 random groups of sizes ranging from 2 to 100 per group from the 1st set (sample size:4991)and then computed the average...

• Replies: 0
• Views: 2,684
11-16-2008, 04:24 AM
40. ### chi-sq help

ok i have this problem Do these data suggest there are significant differences in opportunities for black and Hispanic Americans who have completed...

• Replies: 3
• Views: 2,352
11-15-2008, 04:24 PM
41. ### Help with Principal Component Analysis

Hi All Can Principal Component Analysis be used to discover what variables explain variability in a set of data from a dose response experiment...

• Replies: 0
• Views: 4,132
11-15-2008, 11:43 AM
42. ### Help with HLM

Can anybody help me by telling whether the following data IS suitable form HLM? Variable 1: Three regions (of the world) Variable 2: Several...

• Replies: 13
• Views: 4,408
11-15-2008, 10:12 AM
43. ### Correlation among Correlations

I know correlation between AB, AC as 0.91 and -0.45 respectively. Also standard deviation of three variables (A, B, and C) are given as 6.2, 8, and...

• Replies: 6
• Views: 5,514
11-15-2008, 05:54 AM
44. ### Wilcoxon vs Friedman? help

Hello everyone, I'm new to this site. I'd just quickly like to say how useful this site has been. I've been reading through posts for the last 3...

• Replies: 0
• Views: 4,395
11-14-2008, 08:21 PM
45. ### re: zero in confidence interval but p-value < alpha

Hello. I would be very much appreciative of any help in this issue. The problem involves the difference of means of 2 dependent samples. The null...

• Replies: 7
• Views: 9,911
11-14-2008, 07:27 PM
46. ### Problem of high correlation between some of predictors to be used in StepW regression

Hi All, I was supposed to do a stepwise regression to predict the crop cover using satellite image indices, Soil types and Soil geomorphogenetic...

• Replies: 1
• Views: 2,361
11-14-2008, 02:04 PM

Hi I have done some work analysing a number of research questions. I now want to go back across all of these questions and see whether respondents...

• Replies: 2
• Views: 1,873
11-14-2008, 11:42 AM
48. ### simple slopes in 3-way moderated regression

Hi I am trying to work out how to do simple slopes test for a three way moderated regression. Here is how my data set looks: IV 1: dichotomous...

• Replies: 4
• Views: 7,248
11-14-2008, 11:39 AM
49. ### stepwise regression

Hi everyone, A quick couple of questions regarding stepwise regression: a)how can you have variables added to the model that become insignificant...

• Replies: 0
• Views: 2,588
11-14-2008, 09:23 AM
50. ### The variance of variance

Hello all I am investigating variances between projected and actual costs in my workplace and plan to implement a solution to reduce the spread...

• Replies: 0
• Views: 2,768
11-13-2008, 06:47 PM
51. ### level of significance Calculator Problem

I need help with this question, Im studying for a test and this was an example problem. ( I already have the answers, im just trying to figure out...

• Replies: 3
• Views: 14,359
11-13-2008, 06:36 PM
52. ### Non-Parametric Testing

Hello, My data set is not normalized and any transformations (lg10, sqrt) I have done have only made it worse. That said, I have turned to the...

• Replies: 1
• Views: 2,826
11-13-2008, 06:28 PM
53. ### Stat S2 level Question

An indoor tennis centre has five courts which are booked by members of the public, usually over the telephone. Demand for each hour in the...

• Replies: 1
• Views: 2,053
Sig
11-13-2008, 12:28 PM

Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

• Replies: 0
• Views: 1,482
Sig
11-13-2008, 10:44 AM
55. ### Logistic Regression--HELP and THANK YOU

Hi. My thesis is on using 5 measurements to use the proximal end of the tibia to determine ***. I'm using SPSS Free Version 17. My dependent...

• Replies: 1
• Views: 2,223
11-13-2008, 07:45 AM
56. ### how to determine Beta and power

I have worked on this problem for so long, that I am now confusing myself. Any help you can give me, would be appreciated. I am not looking for...

• Replies: 0
• Views: 1,750
11-12-2008, 10:35 PM
57. ### quick question

2 questions, ill tell you what ive done so far. i) For the survey results below, for 300 students, find the p-value for the test of the null...

• Replies: 0
• Views: 2,131
11-12-2008, 08:39 PM
58. ### Greyhound betting

I am a greyhound betting man and would appreciate some statistical advice. I bet with a betting exchange company on the internet.The type of bet I...

• Replies: 0
• Views: 2,318
11-12-2008, 01:33 PM
59. ### Right test?

Hi guys, I am not sure I am testing the right way!? I have a sample with the number of order insertions for 30 different stocks for a complete...

• Replies: 4
• Views: 1,992
11-12-2008, 10:21 AM

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