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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: 66,620
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: 196,561
07-16-2014, 11:01 AM
1. ### Nominal, Ordinal, Ratio, Interval...? Need help.

I am having a really hard time with deciding whether things are nominal, ordinal, ratio, or interval. I was given four problems and asked to list...

• Replies: 2
• Views: 16,952
01-30-2006, 07:11 PM
2. ### principal component analysis and scoring

I have a set of data and want to determine which cases group in terms of the component factors determined through principal component analysis. I'm...

• Replies: 1
• Views: 3,218
01-31-2006, 07:46 AM
3. ### Variability

Hi, I have a question for my home work about finding the 3 measure sof vairability for the variable that is given to us.but i am little confuse...

• Replies: 2
• Views: 3,895
02-01-2006, 10:49 AM
4. ### Median, Conceptual

So the problem goes: The 14 people in group A have median age 28.4 years. The 20 people in group B have median age 36.2 years. What can you say...

• Replies: 1
• Views: 2,834
02-01-2006, 12:23 PM
5. ### estimating parameters.

Hello there, I am having trouble with the following question. "An experiment in which 64 indivduals had their pulse rates recorded (x) and ,...

• Replies: 1
• Views: 2,842
heD
02-04-2006, 08:53 PM
6. ### Analysing an interstellar colony

Hi, This is really easy stuff for all the stats wizards here, but I'd really appreciate some help please. :yup: Suppose there's a colony of...

• Replies: 6
• Views: 3,188
02-07-2006, 07:59 AM
7. ### related or independent observations - help needed

Hi, I am working in a project using data gathered for business purposes and I have a problem related to the observations in my samples. A...

• Replies: 1
• Views: 3,663
02-07-2006, 08:32 AM
8. ### T statistic

I was recently asked to calculate a T statistic for a correlation test and I'm not sure what the test identifies and how to read the results. I used...

• Replies: 1
• Views: 4,791
02-07-2006, 03:22 PM
9. ### Help

I have to do a presentation for stats class tonight and don't understand how to explain my quantile plots, confidence intervals, correlation of...

• Replies: 1
• Views: 2,159
02-07-2006, 08:14 PM
10. ### Logistic regression--Odds Ratios

Sometimes I have trouble with interpreting ORs. When it is less than 1, how do you interprete it. For example, if the OR is 0.45 between...

• Replies: 2
• Views: 3,043
02-09-2006, 08:52 AM
11. ### Anova

Can I use ANOVA when the variables were in a way correlated? I think we assume that the variables are independent in ANOVA. Am I right?

• Replies: 1
• Views: 2,299
02-09-2006, 09:05 AM
12. ### Fischer's

Is Fischer's exact.. a good way when we have small sample size, like around 50?

• Replies: 1
• Views: 2,738
02-09-2006, 09:06 AM
13. ### Factor analysis

Is anyone an expert on factor analysis?

• Replies: 13
• Views: 4,371
02-10-2006, 09:17 AM
14. ### Observed and expected

It may be a very silly question, but I have trouble conceptualizing these two terms. I had this contingency table with 2 rows and colums. Is...

• Replies: 3
• Views: 10,094
02-12-2006, 05:24 PM
15. ### Numerical Measures

I am having major Statistics burnout. I hope someone can please help me with this. I know the range is the largest value minus the smallest value,...

• Replies: 1
• Views: 4,738
02-12-2006, 08:26 PM
16. ### Simple linear regression - Do I include the constant in the equation?

Hello, I am hoping someone can help me with a few regression questions. I am running a number of simple linear regressions....Do I want to (should...

• Replies: 4
• Views: 7,398
02-13-2006, 12:11 AM
17. ### Difference between RMS & Standard Deviation

Hi there, I am trying to figure out the difference between RMS and Standard Deviation. Are they two ways of saying the same thing? I understand...

• Replies: 2
• Views: 68,374
02-13-2006, 09:56 AM
18. ### level of meausrement

Hi , I am woundering if you can tell me if I am corect in understanding the levelof mesuremnet? The following data's level of measurement is...

• Replies: 2
• Views: 3,063
02-13-2006, 03:53 PM
19. ### REGRESSION QUESTION - need residuals

I have done a series of regressions, all of which have slopes very close to O. I want to perform a Mann-Whitney U tet for independent samples between...

• Replies: 1
• Views: 2,849
02-13-2006, 11:21 PM
20. ### Interaction

I need help clarify something. I had about 300 youths to investigate the association between perceptions and treatment adherence. I categorized age...

• Replies: 5
• Views: 4,109
02-16-2006, 09:26 AM
21. ### skewness issue

I'm trying to find the skewness for this distribution using SPSS: Bin..........Freq 0-10........78 10-20......2589 20-30......922...

• Replies: 9
• Views: 3,559
02-16-2006, 04:30 PM
22. ### Mls

Newbie here! Lost in statistics.....:confused: I really need someone to explain how to find a Confidence Interval for a correlation coefficient. ...

• Replies: 3
• Views: 2,310
02-17-2006, 10:33 AM
23. ### using Anova for 3 raw data analysis

I want to know the way to using anova for raw data analysis. Suppose have 3 batches of data, and want to know whether the data should be process per...

• Replies: 2
• Views: 3,896
02-18-2006, 12:25 PM
24. ### Central Limit Theorem

I am having trouble coming up with the right answer for the following problem: Elevator Design: Womens heights are normally distributed with a...

• Replies: 1
• Views: 5,544
02-18-2006, 02:38 PM
25. ### Need Help, Sampling Distribution of Pins

Hey I have been toiling over this homework for a while now. I think I may have it correct but I am not certain. Here is the background info for the...

• Replies: 2
• Views: 4,623
02-18-2006, 05:20 PM
26. ### Comparing distributions, Two-Sample KS-test and Bonferroni

Hi there, The following is my problem for which I’m grateful to have any advice/opinions: I measured the distances animals moved in 3 different...

• Replies: 1
• Views: 10,796
02-19-2006, 05:14 PM
27. ### Likert data question

In working with Likert data on a survey when you encounter a double entry on one question how do you handle that response? my hunch is to throw...

• Replies: 4
• Views: 2,861
02-20-2006, 01:02 PM
28. ### random effects model (ANOVA)

hello there, I am struggling with the following question: "show that the error SS, for the random effects model, is the same...

• Replies: 0
• Views: 3,347
02-21-2006, 06:35 AM
29. ### Stats help

Hi all, I am a new user of this forum and seek some advice on some data handling. I am carrying out a two-way repeated measures ANOVA, on SPSS,...

• Replies: 1
• Views: 2,283
02-21-2006, 09:22 AM
30. ### Linear Regression??

So I'm a little clueless with this I feel like I don't have enough information but maybe I'm missing something. Here is the question: Assume that...

• Replies: 4
• Views: 3,084
02-22-2006, 08:58 PM
31. ### Central Limit Theroy

I have a problem i cant seem to figure out. X is from a population with u=53 and s=24. A sample size of 59 is taken from the population and an...

• Replies: 2
• Views: 2,243
02-23-2006, 05:07 AM
32. ### Nonparametric post hocs

Hi all, I am analyzing behavioral data from experiments I have conducted. I have used the Kruskal-Wallis nonparametric ANOVA to identify if...

• Replies: 2
• Views: 7,364
02-23-2006, 08:08 AM
33. ### Student Needing Help

I am lost with this question. Could someone please help? A normal population has a mean of 20.0 and a standard deviation of 4.0. Compute the...

• Replies: 4
• Views: 3,005
02-23-2006, 01:29 PM
34. ### level of measurement

Hi John, just to confirm if the following is the ratio measurement. I belive its ratio because the zero is the actual possibility, when there is no...

• Replies: 4
• Views: 7,819
02-23-2006, 01:53 PM
35. ### Help needed for biology coursework

Just wondering if anyone can help? I need to know what Stats test to use.... I was investigating the effect on maggots after being exposed to...

• Replies: 3
• Views: 3,108
02-24-2006, 08:12 AM
36. ### question on 2 tailed Z test

If you performed a 2 tailed z test with alpha= 0.05, the null hypothesis will be rejected if the computed value of the z stats is higher than ______...

• Replies: 1
• Views: 4,914
02-24-2006, 02:40 PM
37. ### question on research problem

I'm having some trouble with conducting a hypothesis test: Suppose it has been esablished that musicians, as a general population, have a mean IQ...

• Replies: 1
• Views: 2,251
02-24-2006, 03:20 PM
38. ### Pre/Post Data

Hello. I have pre/post data that I would like advice on what would be the most appropriate data analysis method. I visited a group of clinics and...

• Replies: 1
• Views: 7,934
02-24-2006, 05:33 PM
39. ### Hypothesis testing with no stated standard deviation

My head is going to explode, can someone help before it is too late? Te problem: According to the government, 23% of all American adults have...

• Replies: 1
• Views: 44,540
02-25-2006, 08:35 AM
40. ### Computing Z scores

I am doing homework and i can't seem to figure out the correct answer. Question: Men vs. Women The average 20 - 29 year old man is...

• Replies: 1
• Views: 15,521
02-26-2006, 06:07 PM
41. ### Computing Z-Scores #2

The following data represent the number of inches of rain in Chicago, Illinois, during the month of April for 20 randomly selected years. 2.47,...

• Replies: 2
• Views: 7,436
02-26-2006, 08:30 PM
42. ### formulas

Good evening, Ladies and Gents., I am looking for formulas fro the mean, median, quartiles all the above. I have a test this week and my text book...

• Replies: 3
• Views: 3,024
02-27-2006, 11:28 AM
43. ### stuck need help

THIS IS THE QUESTION PiggyBank wants to ESTIMATE the MEAN DOLLARS that each card holder will spend EACH MONTH. It would like to be within PLUS OR...

• Replies: 1
• Views: 3,052
02-27-2006, 09:05 PM
44. ### categorical age or year-age?

Hi John: I decided to use 3-level categorical age: children, younger adolescents, older adolescents. I also included year-age in the stratified...

• Replies: 3
• Views: 3,361
03-01-2006, 12:30 PM
45. ### Multivariate Regression - I think!

Hi, I'm performing a psychological study about gender differences in attraction. Participants select between a number of figures that vary in...

• Replies: 22
• Views: 8,210
03-03-2006, 12:28 PM
46. ### Question on decision rule

I'm a little confused on how to make a decision rule given an alpha value. For example if the problem was a two ailed z test with a alpha of .03,...

• Replies: 3
• Views: 12,811
03-03-2006, 02:17 PM
47. ### 95% confidence interval

I'm not sure how to construct a 95% confidence interval for a one tailed test. I know that for a two tailed test, it's just the critical value...

• Replies: 1
• Views: 3,002
03-03-2006, 03:13 PM
48. ### Confidence Intervals, Sample Size

The mean weight of trucks traveling on a particular si not known. A highway inspector needs an estimate of the mean. a random sample of 49 trucks...

• Replies: 1
• Views: 2,510
03-03-2006, 11:05 PM
49. ### Normal Distribution question...

This is from a college problem sheet. I'm having quite a bit of difficulty with it. So any help would be greatly appreciated. Let the random...

• Replies: 1
• Views: 1,920
03-04-2006, 01:03 PM
50. ### Statistics question

Hi there, I have a stats question regarding a project I'm working on that I do not have the answer to and I would be grateful if anyone can help...

• Replies: 8
• Views: 3,527
03-04-2006, 10:38 PM
51. ### Eigenvalues

Hi Would you mind explaining the concept of the eiganvalue to me? Thank you Diane

• Replies: 1
• Views: 13,275
03-04-2006, 10:43 PM
52. ### p-value and relation to error

How does p-value relate to error?

• Replies: 1
• Views: 1,953
03-05-2006, 01:26 PM
53. ### STUCK and dont know what to do HELP

The assignement outlined: First interpretation of bank statement: The bank does not know whether the “mean dollars spent per card holder per month...

• Replies: 1
• Views: 2,690
03-05-2006, 01:29 PM
54. ### I Need Help?????

السلام عليكم HOM I USED BOX-MUKKER TRANSMITATION FOR GENRATION SAMPLS FROM UNFORM DISTRUBIOTIN NORMAL, DOUBLE EXPONATIANL, EXPONATIANL AND I NEED...

• Replies: 1
• Views: 1,998
03-05-2006, 01:30 PM
55. ### three-way anova help please!

hi! i'm currently performing a practical in R requiring 3-way fixed effects ANOVA for my maths degree. There are 2 quantitative factors -...

• Replies: 4
• Views: 3,202
03-05-2006, 04:21 PM
56. ### Roc

Hi! One real quick and basic question. I need to evaluate the performance of a speaker verification system and I have read that receiver operating...

• Replies: 2
• Views: 3,086
03-05-2006, 07:49 PM

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