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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,624
09-30-2005, 09:44 AM
2. ### 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: 196,569
07-16-2014, 11:01 AM
1. ### 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: 2,859
11-20-2012, 04:37 PM
2. ### Application of PCA component scores in regression model.

Hi, Is there anybody who is more or less "fluent" in principle component analysis? I'd need to use 20 categorical variables (2 or 5 or 7...

• Replies: 12
• Views: 7,083
09-15-2011, 06:16 AM
3. ### Very long post - need help thanks

Dear All, I am writing to you because I have got a lot of troubles with some concepts regarding Generalised Linear Models. I need to understand...

• Replies: 18
• Views: 4,537
12-28-2011, 05:41 PM
4. ### Expected value from Hessian

Hi, Can someone tell me what the expected value from second derivative of L(y|x) over B0 and B1 or B0^2 or B1^2 or standard derivation is? I have...

• Replies: 4
• Views: 3,026
02-09-2012, 04:03 PM
5. ### statistical significance betwee 2 groups

Hello all, I'm trying to analyze data from 2 different groups for statistically significant differences and could definitely use some help here....

• Replies: 1
• Views: 985
05-24-2014, 07:41 AM
6. ### My Test Grade and Asymmetrical Skewing

I took a test 2 weeks ago and the professor handed back the grades today. The average was 48 Low 18 High 84 my grade was 60 I'm not sure...

• Replies: 2
• Views: 1,389
05-16-2014, 02:53 AM
7. ### Factorial design question about blocking?

_a factorial experiment question: say I have a 2^3 factorial, each cell with n observations. There are two factors (lets call them A, B) that...

• Replies: 5
• Views: 3,666
02-02-2009, 01:00 AM
8. ### Correlation between two ranked independent lists

Hello, I have two independent lists X and Y none of the yi depend on xi. Total number of elements in both the list is same, List X is generated...

• Replies: 0
• Views: 810
10-29-2015, 06:00 AM
9. ### Modeling dependencies

Hi everybody I am looking for a method to assess the dependencies between random variables (Cross sectional data) And I know that I can use...

• Replies: 7
• Views: 1,705
06-07-2015, 02:23 AM
10. ### Am I using T-Test correctly?

I am sampling small group of 11 people. I am trying to see the effect of changing one factor in the test. I sampled the 11 people before the change...

• Replies: 3
• Views: 2,487
11-23-2008, 05:36 AM
11. ### Confidence interval & Hypothesis questions- Basic stats-

Hi all, I had a question I was working on and needed a review on the approach I was taking & figure out if the answer I have gotten is correct: ...

• Replies: 0
• Views: 1,803
10-13-2012, 10:03 PM
12. ### Abnormal Interaction Effect

Hey people, After I have conducted an ordered logistic regression with a DV and two IVs, I get the following result: Two main effects (IV1 on DV,...

• Replies: 0
• Views: 1,014
03-26-2014, 02:13 PM
13. ### Comparing percentages based on qualitative data

Dear all, Could someone please advise me which test to use/how to compare two percentages that are based on qualitative data? I have searched SPSS...

• Replies: 1
• Views: 1,421
05-24-2013, 05:22 AM
14. ### How many yellow balls in the basket?

I have 48 baskets that contain 100 balls in 10 different colors randomly placed. There is anywhere from 1 ball to 10 balls in each basket, but no...

• Replies: 7
• Views: 2,436
03-14-2012, 08:49 AM
15. ### Which significance test should I use?

I have a research questionnaire using a five point Likert scale (not at all, little, neutral, considerable, significant). I want to statistically...

• Replies: 1
• Views: 1,311
01-28-2017, 04:44 AM
16. ### Difficulty in choosing the ideal target group? Any Suggestions.

Hi, I am trying to study the prospects of Internet banking in one of the states in India. I have constructed the research model and have seven...

• Replies: 0
• Views: 871
11-15-2013, 01:40 AM
17. ### Need help with Hypothesis test!!!

Okay I can't seem to figure out this problem. Would really appreciate any help that can be given. A sample of 81 account balances of a credt...

• Replies: 3
• Views: 5,129
12-14-2005, 08:14 AM
18. ### How to work out min & max from values for range, median and mode

Hi, I was wondering if you could help me with the following (very basic) stats problem. How do I find out the minimum and maximum when I don't...

• Replies: 6
• Views: 1,589
04-21-2014, 02:20 PM
19. ### Analyzing/Understanding Results from Factor Analysis

I ran a factor analysis on a data set (running both an orthogonal and oblique rotation). The data is from surveys completed by middle-school students...

• Replies: 1
• Views: 3,583
11-17-2009, 03:12 PM
20. ### Mixing/merging two datasets

For my research, I need to estimate a dependent variable from 4-5 independent ones. (estimating corrosion rate from environmental variables) From my...

• Replies: 0
• Views: 2,548
02-06-2008, 11:49 PM
21. ### Simulation

Hi Guys I'm working on 800 bivariate data. ( loss & Expense) . I've found fitted distribution which was Pareto. I also worked on Copula to find the...

• Replies: 0
• Views: 1,055
10-05-2016, 04:52 AM
22. ### How can I do multi column sort?

Suppose I've a table with multiple columns like this for applicants for a job Applicant name || Degree in Computer || salary John ...

• Replies: 12
• Views: 3,989
09-17-2011, 02:35 AM
23. ### Comparing responses within a sample

So maths in general was never my strong point, let alone statistics! But alas, here I am trying to get my head around it for my undergraduate...

• Replies: 2
• Views: 1,466
02-10-2012, 09:16 AM
24. ### Transform confusion matrix to a similarity matrix

Hi, I have a simple question. I want to run a MDS from some data of close set identification. Therefore, I have a 12X12 confusion matrix and I...

• Replies: 0
• Views: 3,860
06-23-2009, 06:50 AM
25. ### Error on mean or standard deviation

I have a plot which has average values on the y axis but the averages are based on only 3 samples. Should I use the standard deviation or the error...

• Replies: 0
• Views: 898
11-17-2013, 10:04 AM
26. ### Is the game fair?

Hi, I have recorded the results of a binomial game (1 = win, 0 = lose.) The sequence is presented below. I am asked to provide compelling...

• Replies: 9
• Views: 4,281
12-04-2008, 05:03 PM
27. ### Consecutive wins

Hello all, I have played binomial game and recorded wins and losses. I played 179 rounds and then analyzed the resulting sequence. I recorded the...

• Replies: 5
• Views: 4,250
12-11-2008, 02:45 PM
28. ### Compare std deviation to know which dataset has more data points closer to mean?

Hi I have two datasets each with different mean and standard deviation (std). We know that, std is a measure of the dispersion of the numbers from...

• Replies: 2
• Views: 1,223
05-28-2013, 11:41 AM
29. ### evaluating Kruskal-Wallis test results

Using an online statistical tool I evaluated 5 group of students' (self-identified ethnic groups with na= 105; nb= 50; nc= 44; nd= 43; ne= 33.) ...

• Replies: 7
• Views: 3,816
12-30-2016, 03:02 PM
30. ### using Mann Whitney

I am trying to analyze a survey that asked students to respond to questions e.g. “In my opinion, the economic system in the US leads to an unfair...

• Replies: 0
• Views: 2,580
12-28-2016, 09:06 AM
31. ### Standard deviation for proportions

Hi,,,can u please explain me how to calculate standard deviation and standard error for a binomial distribution when you have several samples? For...

• Replies: 0
• Views: 2,142
Zue
12-15-2013, 03:27 AM
32. ### Creating flags for a variable

Hi all I was wondering if I could get some advice please. I have this problem at work that has had me stumped for a few days. I have the...

• Replies: 1
• Views: 3,055
10-03-2008, 10:31 PM
33. ### Cronbachs alpha

I have recently created and distributed a survey regarding culture and usability. I want to research how cultural background gives people a different...

• Replies: 0
• Views: 1,971
05-01-2008, 08:28 AM
34. ### Mgf

WHo can we find the MGF for this Pdf? f(x) = 0.5^x x=1,2,3,...... f(x) = 0 ...

• Replies: 3
• Views: 3,679
10-04-2009, 04:10 PM
35. ### MGF of lognormal distribution

Let x ~ N (μ,σ^2 ) and consider the lognormal r.v. y= e^x. Given the MGF of the normal distribution M_x (t)= e^((μt+0.5σ^2 t^2)). How to compute...

• Replies: 2
• Views: 10,811
10-08-2009, 12:46 PM
36. ### Confused on Exponential PDF

Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

• Replies: 0
• Views: 1,848
05-28-2006, 04:13 AM
37. ### Confused on Exponential PDF

Hi, I am a bit confused on the Exponential prob density function. I am clear on a simple problem involving a poisson arrival mechanism and how to...

• Replies: 0
• Views: 1,993
05-30-2006, 01:07 AM
38. ### How can I compare the relative effects between values of a categorical IV?

I am a social science phd student trying to figure out a statistical test for small conference presentation I am working on. However, I realized I...

• Replies: 1
• Views: 2,351
08-22-2011, 02:55 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: 1,906
11-08-2008, 09:48 AM
40. ### Urgent. I should use T Test or Z test?

A beer bottling factory labels the bottles for one particular type of beer as containing 330ml of beer. In order to err on the safe side, it actually...

• Replies: 3
• Views: 4,828
12-07-2008, 02:03 PM
41. ### What doed this problem mean?

A newspaper article recently claimed that, in the clothing industry, the wage per hour of a manual worker is higher in the South than in the North of...

• Replies: 0
• Views: 2,327
12-06-2008, 06:37 AM
42. ### variance of population mean...

.. when the population consists of two sub-populations. size of sub-population1: 20.000 size of sub-population2: 10.000 size of sample...

• Replies: 10
• Views: 5,070
zxc
11-08-2008, 08:43 AM
43. ### to use or not to use weights in factor and cluster analysis

What do you think? Which one bias results less, omitting weights or using weights?

• Replies: 0
• Views: 2,225
zxc
05-21-2009, 07:09 AM
44. ### graphs to represent data

Hello, I have IQ scores for 2 matched-sample groups (exposure to stimulating music before the testing and no exposure) and the n for each group is...

• Replies: 2
• Views: 2,272
02-24-2009, 01:30 AM
45. ### difference between the proportion. Situation a,b or c

done lok this now

• Replies: 1
• Views: 2,794
04-24-2011, 07:15 PM
46. ### whether Y(employees injured) variation is due to X1(job function) or X2(population)

Here is the actual question- There are 1000 employees in a firm, and the firm has four departments namely D1, D2, D3 and D4 with 100, 200, 300, 400...

• Replies: 10
• Views: 2,048
08-25-2014, 09:39 PM
47. ### variance of log(s^2)

Y1,...,Yn are i.i.d. random variables from N(mu, sigma^2) distribution. s^2 = sum/(n-1) , where i = 1,...,n Find var(log(s^2)) My approach:...

• Replies: 2
• Views: 9,496
12-01-2010, 11:18 AM
48. ### estimate using method of moment

I need to estimate lambda0 and lambda1 using method of moments. I know E(X) = (lambda0+lambda1)/2 and E(X^2) = lambda0^2 + lambda1^2 So in...

• Replies: 0
• Views: 1,425
11-20-2010, 06:50 PM
49. ### Might be a silly question about t-tests but...

...i really need some advice about how to go about comparing some means. Basically, I have the means and standard deviations for three different...

• Replies: 8
• Views: 3,035
11-10-2006, 01:33 PM
50. ### Multicollinearity....

... ok, anyone's thoughts on this would be great. I have a result in which my two IV predictors cancel out an IV, DV relationship. Thanks to John for...

• Replies: 0
• Views: 3,134
11-11-2006, 04:57 PM
51. ### Skewness and Kurtosis

I have to 'show the standard error of the skewness and kurtosis as a footnote to a table' - any ideas on how this is expressed? I thought it might be...

• Replies: 2
• Views: 3,707
11-11-2006, 04:45 PM
52. ### coverting to T scores

Hello, I'm using a measure called the Hospital Anxiety and Depression Scale and I wondering if there is a way to covert scores into T scores? I'm...

• Replies: 0
• Views: 1,631
11-17-2006, 05:38 AM
53. ### Power in regression studies

Hi, can someone help me with an idiots guide to calculating power for a study using linear regression. I need power at .05 level and i have one IV,...

• Replies: 0
• Views: 1,842
11-30-2006, 08:37 AM
54. ### how can I evaluate chi-square CDF?

Hello, I want to know how can I evaluate CDF of chi square by 1 degree of freedom in special point, Anybody can help?

• Replies: 3
• Views: 2,337
01-22-2013, 09:30 AM
55. ### What test should I use?

I trying to resolve this problem but I am getting frustrated. After listening to different opinion I am not sure anymore about what to do. 3 hens...

• Replies: 0
• Views: 1,497
04-16-2009, 08:35 PM
56. ### Dealing with Zero Values in a G-test

Hello, I am dealing with some zero values which are not valid in a G-test. Is it appropriate to substitute zero with a 0.000001 for example? I...

• Replies: 0
• Views: 1,383
04-10-2013, 08:59 PM

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