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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. ### Which Tests are appropriate?

I have created a survey where participants state their agreement with my statements on a 7 point likert scale. Also 3 category questions, eg their...

• Replies: 6
• Views: 3,629
09-19-2006, 09:31 AM
2. ### permutations

1. A combination lock has 60 different positions. To open the lock, you move to a certain number in a clockwise direction, then to a number in the...

• Replies: 2
• Views: 3,822
09-18-2006, 08:44 PM
3. ### More questions about symmetry

How can a distribution be symmetric and be positively/negatively skewed? What does reasonably symmetic means? What do they mean by a distribution...

• Replies: 1
• Views: 2,374
09-18-2006, 08:35 PM
4. ### more permutations

find the number of ways of arranging the letters of MATCHING if; a. there are no restrictions; b. the first letter must be M; c. the odd numbered...

• Replies: 3
• Views: 3,074
09-18-2006, 08:31 PM
5. ### Empirical rule & Negative intervals

When calculating interval I got a negative interval: (-6406371 -> 14892937) I have to make a statement about the percentage that you would...

• Replies: 1
• Views: 5,823
09-18-2006, 01:26 PM
6. ### Confusion!!

Hello, I am new to stats and have a couple basic questions regarding sampling , the central limit theorem and probability. If the sample size...

• Replies: 1
• Views: 3,118
09-18-2006, 01:25 PM
7. ### Symmetric or not?

I know that when the mean and the median is close in values to each other, the distribution will be symmetric. But how close should they be? I have...

• Replies: 1
• Views: 3,794
09-18-2006, 01:20 PM
8. ### How to compare Probit means between two groups.

I have calculated probit median (mean) ages of attainemnt of various stages (skeletal maturity) for two independent groups of subejcts. How can I...

• Replies: 2
• Views: 4,072
09-18-2006, 11:28 AM
9. ### Stratified Samples ???

Hi, I'm having some trouble with this question. The question asks Stratified samples are widely used to study large areas of forest. Based...

• Replies: 4
• Views: 9,548
09-17-2006, 07:45 PM
10. ### multiway frequency analysis, Canonical correlation

I have a set of survey report of my college students who decided to change to other schools. There were 3,000 students surveyed over the 10 year...

• Replies: 1
• Views: 3,366
09-17-2006, 09:39 AM
11. ### Power of one sample test for variance

Hi, I have been trying to test the following hypotheses. H0 : sigma = 10 H1 : sigma != 10 the sample size is 200 and the sigma observed is...

• Replies: 1
• Views: 2,913
09-15-2006, 10:09 PM
12. ### 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: 2,871
09-14-2006, 11:22 PM
13. ### Decision analysis

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

• Replies: 1
• Views: 3,735
09-14-2006, 09:09 PM
14. ### 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: 4,289
09-14-2006, 10:20 AM
15. ### 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: 2,435
09-14-2006, 06:25 AM
16. ### 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: 2,301
09-13-2006, 10:31 PM
17. ### 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: 7,487
09-13-2006, 07:59 PM
18. ### 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: 9,643
09-13-2006, 08:19 AM
19. ### 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: 3,089
09-12-2006, 11:30 PM
20. ### Moved: need help with Spss

• Replies: -
• Views: -
09-12-2006, 07:39 AM
21. ### 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: 8,151
09-11-2006, 08:53 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: 2,357
09-11-2006, 04:07 PM
23. ### 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: 6,220
09-10-2006, 11:46 PM
24. ### 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: 2,735
09-10-2006, 10:17 PM
25. ### How to use a random sampling table

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

• Replies: 2
• Views: 3,976
09-10-2006, 09:42 PM
26. ### 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: 2,770
09-10-2006, 05:40 PM
27. ### 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: 8,821
09-10-2006, 08:57 AM
28. ### 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: 2,594
09-09-2006, 02:21 PM
29. ### 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: 3,103
09-08-2006, 10:12 PM
30. ### 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: 1,541
09-07-2006, 08:39 AM
31. ### 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: 5,009
09-07-2006, 08:35 AM
32. ### 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: 1,753
09-06-2006, 03:10 PM
33. ### 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: 2,377
09-06-2006, 11:07 AM
34. ### 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: 4,899
09-06-2006, 06:56 AM
35. ### 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: 2,068
09-06-2006, 04:47 AM
36. ### 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: 1,843
09-05-2006, 07:04 PM
37. ### 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: 7,042
09-05-2006, 08:34 AM
38. ### 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: 1,733
09-05-2006, 04:01 AM
39. ### 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: 2,646
09-04-2006, 09:00 PM
40. ### 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: 1,873
09-04-2006, 04:12 PM
41. ### 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: 3,055
09-04-2006, 12:36 PM
42. ### 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: 3,790
09-04-2006, 10:49 AM
43. ### 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: 2,499
09-03-2006, 01:48 PM
44. ### 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: 5,804
09-03-2006, 07:45 AM
45. ### 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: 7,434
09-03-2006, 07:11 AM
46. ### 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: 8,369
09-02-2006, 12:18 PM
47. ### Degrees of freedom

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

• Replies: 5
• Views: 4,793
ron
09-02-2006, 08:24 AM
48. ### 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: 2,593
09-01-2006, 10:25 AM
49. ### 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: 2,805
09-01-2006, 09:58 AM

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

• Replies: 0
• Views: 1,996
09-01-2006, 08:38 AM
51. ### 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: 3,988
08-31-2006, 11:34 PM
52. ### Multidimensional Scaling

Does anyone have any esperience with multidimensional scaling with SPSS?

• Replies: 1
• Views: 3,002
08-31-2006, 10:43 AM
53. ### 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: 3,180
08-31-2006, 10:20 AM

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