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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: 66,710
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: 196,686
07-16-2014, 11:01 AM
1. ### Mediated Regression Analysis

Hi everyone, First time posting on here. Greetings from Edinburgh. Would be grateful if someone could explain what a mediated regression with an...

• Replies: 2
• Views: 6,165
08-25-2006, 03:21 PM
2. ### analysing nominal data

hi, does anybody have any ideas how to analyse nominal data, which is mixed ie. betwee groups and repeated measures? thanks

• Replies: 0
• Views: 3,140
08-25-2006, 03:24 PM
3. ### symbols symbols symbols

I am in my second stats class and have found that this professor uses different symbols than my previous professor. Example - for the alternative...

• Replies: 0
• Views: 2,848
08-25-2006, 05:23 PM
4. ### Sample independence

I have a simple random sample study design in which I randomly selected 1X1 mile sections and around these sections I randomly placed 3 points. At...

• Replies: 0
• Views: 2,830
08-25-2006, 06:28 PM
5. ### Likert and t-test

Newbie here... I administered 2 surveys, pre and post event using a 1-5 Likert-type scale. I am using the t-Test for correlated measures to...

• Replies: 3
• Views: 4,730
08-25-2006, 07:20 PM
6. ### I need simple help for a documentary.

Hi, I've search a long time for this place, sure hope I can find some help. I'm doing a feature documentary where three concrete wall samples...

• Replies: 0
• Views: 2,174
08-26-2006, 09:07 PM
7. ### T-test or Chi square

Dear Anyone I want to compare two variables with continuous scores (originating from summated likert scales) between two categories. Should I...

• Replies: 2
• Views: 2,652
08-27-2006, 05:58 AM

:confused: i've just started studing statistics and i want to use the chebychev's therorm, however i'm not sure how can i find the value of the...

• Replies: 1
• Views: 2,312
08-27-2006, 12:21 PM
9. ### writing up output into paragraphs

hi, i have a lot of output from chi square tests and wilcoxon matched pairs. does anybody have any advice how best to write it up - into...

• Replies: 1
• Views: 2,499
08-27-2006, 12:26 PM
10. ### Web Site Page Visit Stats (Relative Popularity)

I've started to create a statistical analysis of relative popularity for visits to the articles on a web site. I'm not a statistician, but have...

• Replies: 0
• Views: 2,224
08-28-2006, 11:32 AM
11. ### Comparing PATH coefficients

I am using PATH analysis to examine aggressive behaviour. I have run two separate PATH models with the same participants. Please note these models...

• Replies: 0
• Views: 4,502
jeb
08-28-2006, 11:42 AM
12. ### parametric test??? what test?

hi im doing a study to see whether childrens vocabulary develops quicker when children are cared for at hom or in day care. i would like to get 50...

• Replies: 1
• Views: 3,159
08-29-2006, 03:09 PM

Okay, so I'm horrible at math, and am having the hardest time with this stats problem, if anyone could help, I would so appreciate it. Pollsters...

• Replies: 3
• Views: 6,981
08-29-2006, 10:03 PM
14. ### type I error - non parametric stats

i have run multiple non parametric stats to analyse my data. i read that you cannot make a type I error because the data is not normally distributed,...

• Replies: 1
• Views: 7,632
08-30-2006, 08:29 AM
15. ### Stuck trying to develop test statistic

Hi, I am stuck trying to develop a test stastic for Ho: 2*Mu1 = Mu2 vs. 2*Mu1 not=Mu2 assuming variances known I think some modification has to...

• Replies: 3
• Views: 2,616
08-31-2006, 08:26 AM
16. ### how do you know if a relationship really exists?

So i had a problem where I was supposed to calculate a correlation coefficient for some data using the definitional formula and then interpret the...

• Replies: 4
• Views: 3,157
08-31-2006, 10:20 AM
17. ### Multidimensional Scaling

Does anyone have any esperience with multidimensional scaling with SPSS?

• Replies: 1
• Views: 2,959
08-31-2006, 10:43 AM
18. ### Finding the Reduced Form Equations

Hey this is my first post here. I'm doing a regress with 5 equations and 5 endogenous vairables plus one unique exogenous variable to each equation....

• Replies: 0
• Views: 3,936
08-31-2006, 11:34 PM

Can someone help me to answer those questions: 1 - Assume X + Y are independent standard exponentially distributed random variable. Derive the...

• Replies: 0
• Views: 1,980
09-01-2006, 08:38 AM
20. ### Time Series, exponential smoothing--I need help!

Seems a really simple problem but it's bugging me. I'm using the exponential smmothing formula: NthForecast=k*(N-1)thY + (1-k)(N-1)thForecast,...

• Replies: 0
• Views: 2,765
09-01-2006, 09:58 AM
21. ### choosing the right non-parametric test

Hi there, I am trying to analyze some data and am having trouble trying to figure out what to do. The data is a shrub/elk browse study. The data I...

• Replies: 2
• Views: 2,560
09-01-2006, 10:25 AM
22. ### Degrees of freedom

Hi everyone, Can somebody please explain the concept of degrees of freedom in depth but made simple Thanks

• Replies: 5
• Views: 4,734
ron
09-02-2006, 08:24 AM
23. ### Joint CDF's and pdf problem

I am trying to solve part of a question whicg goes as: Q: Suppose X and Y are two continuous random variables whose joint density function is ...

• Replies: 7
• Views: 8,329
09-02-2006, 12:18 PM
24. ### 2x2 Repeated Measures ANOVA

Hi Everyone! I am working on a 2x2 repeated measures ANOVA and I am having trouble finding much information about it. Basically I taught the same...

• Replies: 3
• Views: 7,350
09-03-2006, 07:11 AM
25. ### p-value determines rejection of null hypothesis?

Is it true that the larger the p-value, the more likely one is to reject the null hypothesis?

• Replies: 1
• Views: 5,763
09-03-2006, 07:45 AM
26. ### Maximum Likelihood Calculus Problems

Hi all, this is my first post here, looks like a great place! I hope to use this board throughout my current semester as it is going to be a rough...

• Replies: 0
• Views: 2,476
09-03-2006, 01:48 PM
27. ### Sample Sizes

Oks. I have stressed a bit and am going to have another go. I have concluded that however I divide the data I have, I am going to end up with...

• Replies: 3
• Views: 3,750
09-04-2006, 10:49 AM
28. ### inferences from two samples

Anyone that might be able to help me out solving a few problems dealing with this topic? If you have AIM my AIM name is BigNiner19. Let me know,...

• Replies: 2
• Views: 3,021
09-04-2006, 12:36 PM
29. ### logistic regression help

I have estimated a logistic regression using a sample of 50:50 of the event and non-event. I know in the population that the actual probability of...

• Replies: 0
• Views: 1,855
09-04-2006, 04:12 PM
30. ### Need help with quiz

10.The reason the t statistic has more variability than the Z statistic is that from sample to sample a.the sample mean becomes smaller and the...

• Replies: 2
• Views: 2,624
09-04-2006, 09:00 PM
31. ### logistic regression

If I estimate a logistic regression using a sample of 50:50 for my event and non-event. What adjustments do I make when predicting with the model if...

• Replies: 0
• Views: 1,719
09-05-2006, 04:01 AM
32. ### True to assume equal variance when testing difference between the means???

hi all, In testing for the difference between the means, is it true that we assume that each of the populations is normally distributed with equal...

• Replies: 1
• Views: 6,986
09-05-2006, 08:34 AM
33. ### homework issues

I have a question on homework as follows: In a normally distributed population that is very large, mu was found to be 100 and sigma = 20. If a...

• Replies: 1
• Views: 1,822
09-05-2006, 07:04 PM
34. ### Interesting Standard Deviation Query

Hi, My boss just asked me if we could use standard deviation for the following: A water treatment plant is recieving flow (F), which is...

• Replies: 2
• Views: 2,053
09-06-2006, 04:47 AM
35. ### Logistic regression and collinearity

Hi everybody! I am working on a logistic regression model using spss. After performing a linear regression in order to use the collinearity...

• Replies: 0
• Views: 4,839
09-06-2006, 06:56 AM
36. ### Struggling with written statistics question.

Hello. I'm currently revising for a statistics re-sit examination and when going over past papers have found one question commonly appears. Both...

• Replies: 1
• Views: 2,358
09-06-2006, 11:07 AM
37. ### Rank Comparisons

Hi, First, thanks in advance for taking the time to look at this. Ok, here goes. I have an interview that lists 12 reasons for why respondents...

• Replies: 2
• Views: 1,741
09-06-2006, 03:10 PM
38. ### ordinal independent variables in ANOVA

We have some data from a 2x5 factorial experiment which, when graphed, looks like an obvious interaction. The ANOVA, however, says the interaction...

• Replies: 1
• Views: 4,975
09-07-2006, 08:35 AM
39. ### Z and p value problem

hi im obviusly new on this forum :) and ask for Your help im having results of research like this 4 groups (with no paracetamol, with 50,...

• Replies: 1
• Views: 1,534
09-07-2006, 08:39 AM
40. ### Hi research student needs urgent help with simple problem

Hi am writing my honours dissertation for sociology and need desperate help calculating a simple problem. Still, I don't even know if it can be done....

• Replies: 7
• Views: 3,073
09-08-2006, 10:12 PM
41. ### mean of a fluctuating time series - what is the uncertainy?

Hello. I very much appreciate your attention to my problem. I have lists of data generated by my computer simulations collected over simulation...

• Replies: 4
• Views: 2,574
09-09-2006, 02:21 PM
42. ### Type I and II, HO and H1

I am committing to memory the definitions of the Type I and II error rates, but my brain is having difficulty when looking at a null and alternative...

• Replies: 2
• Views: 8,764
09-10-2006, 08:57 AM
43. ### Need help with a statistics assignment

Hey, I need help with a statistics assignment,its 2 parts,ive done the first part on my own however as I am unable to do the second one and ask...

• Replies: 2
• Views: 2,752
09-10-2006, 05:40 PM
44. ### How to use a random sampling table

Hi, How do you use a random sampling table :confused: Thank You:)

• Replies: 2
• Views: 3,933
09-10-2006, 09:42 PM
45. ### significant differences between 2 groups

Hi, I have been trying to find out how I can most significantly analyse the differences between two groups in my survey (like male and female) on...

• Replies: 1
• Views: 2,702
09-10-2006, 10:17 PM
46. ### Construct a 95% confidence interval ???

Hi:) , I'm sort of confused with this statistics problem: As part of a recent study conducted in France investigating the effectiveness of...

• Replies: 6
• Views: 6,176
09-10-2006, 11:46 PM

I am using the Least Regression Squares Method and for some reason I keep calculating the y-intercept incorrectly. Is it not the mean of Y - the...

• Replies: 1
• Views: 2,330
09-11-2006, 04:07 PM
48. ### ANOVA results and confidence intervals

Hallo can someone help me with this problem, please? I have done a univariate 2 factor ANOVA with spss. The problem is that the 95% confidence...

• Replies: 2
• Views: 8,097
09-11-2006, 08:53 PM
49. ### Moved: need help with Spss

• Replies: -
• Views: -
09-12-2006, 07:39 AM
50. ### Ogives help! tx~~

Okay I've also been very confused on ogives ..the cumulative average concept. Is there a site that gives tutorials on them? b/c I cannot seem to...

• Replies: 1
• Views: 3,070
09-12-2006, 11:30 PM
51. ### Help me out: Computing SE CV SED LSD

Dear All, In calculating standard error of mean (SE) and coefficient of variation (CV) for summary table of means exported to excel from SAS anova...

• Replies: 0
• Views: 9,597
09-13-2006, 08:19 AM
52. ### Z-Score?

Hi, I'm having a problem figurung out what this question is asking: "Find the number Z such that the proportion of observations that are less...

• Replies: 2
• Views: 7,410
09-13-2006, 07:59 PM
53. ### Confused

I'm not sure if you can help me or not but I thought it would be worth a try. I am totally confused on what my proffessor gave me. He has tried...

• Replies: 2
• Views: 2,284
09-13-2006, 10:31 PM
54. ### Help with Confidence Interval, please

Hi, I'm so rusty at statistics (took it a year ago) I've got the basic formula down, but this particular problem is hitting me in a blind spot. ...

• Replies: 3
• Views: 2,412
09-14-2006, 06:25 AM
55. ### Biodiversity and Population Density Correlations

Hello there Consultants, :wave: I am doing a comparison between two data sets I have collected from two different habitats... I want to show that...

• Replies: 0
• Views: 4,243
09-14-2006, 10:20 AM
56. ### Decision analysis

Equipment Favorbale Unfavorable Sub 100 300000 -200000 Oiler J 250000 -100000 Texan 75000 ...

• Replies: 1
• Views: 3,702
09-14-2006, 09:09 PM
57. ### Moving Targets?

Ok, here is my problem. I have two categories that I think are apples and oranges. The first deals with Dollars Delinquent percentage based on...

• Replies: 0
• Views: 2,842
09-14-2006, 11:22 PM

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