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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: 197,244
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: 67,011
09-30-2005, 09:44 AM
1. ### Comparing correlations

I've asked caregivers to complete three scales relating to the same group of persons with an intellectual disability. I'll call the scales A, B, and...

• Replies: 2
• Views: 10,562
06-01-2010, 07:13 AM
2. ### open output

is there a way i could open my spss tables with word?or excel? I dont have the software at home and I need the tables to do my assignment.

• Replies: 2
• Views: 2,844
Boa
05-31-2010, 08:33 PM
3. ### one-way ANOVA or am I completely wrong?

-------------------------------------------------------------------------------- I wondered if you could help me please. I am prediciting that...

• Replies: 1
• Views: 2,084
05-31-2010, 07:44 PM
4. ### Equivalent for T-test?

Hey, I tried to post a question here earlier, but maybe it was explained poorly. Ill try again. The basic thing is: Before i do the...

• Replies: 1
• Views: 2,544
05-31-2010, 10:29 AM
5. ### Nominal vars, Ward's method and K-means

Hello, First of all: nice forum and lovely to see fellow statisticans and experts here. I have some general questions concerning cluster...

• Replies: 0
• Views: 3,337
05-31-2010, 10:22 AM
6. ### Ordinal Logistic regression for Time data?

Hello everyone! I have just finished running an experiment looking at factors (hungry/not hungry, Illuminated/darkened, plus the interaction of...

• Replies: 4
• Views: 2,953
BGM
05-31-2010, 08:00 AM
7. ### Need Help on this Hypothesis Testing ASAP pls!

A large hat manufacturer, MALLORY HATS, is concerned that the mean weight of their signature Kentucky Derby hat is not greater than 2.5 pounds. It...

• Replies: 1
• Views: 2,371
prp
05-31-2010, 07:29 AM
8. ### Help with Kendall Tau-b

HI Can acnyone please guide me? How I can perform a Z Fisher transformation (which is usually used with Pearson or Spearman)- or a simialr...

• Replies: 0
• Views: 3,211
05-31-2010, 04:54 AM
9. ### Hotel statistics!! Anyone think they can help??

How many hotels are in the US? How many hotel rooms are in the US? How many are in the world? What is the average occupancy rate for hotels in the...

• Replies: 0
• Views: 2,105
05-31-2010, 12:50 AM
10. ### Time taken to run linear regression

Hi, I'm Marty and not a statistician but came here for an advice from people with a knowledge of stats. I am running a small research consultancy...

• Replies: 0
• Views: 1,604
05-31-2010, 12:27 AM
11. ### Hypothesis Testing

I'm having difficulty getting around this question. Could someone please review it and help me with it? Thank you! Question Reads: The director...

• Replies: 0
• Views: 1,671
05-30-2010, 10:23 PM
12. ### alpha and p-value hypothesis testing?

What does it mean when alpha > p-value? I know that when alpha> p-value, you reject the null, and that when alpha < p-value you do not reject the...

• Replies: 1
• Views: 4,291
05-30-2010, 09:16 PM
13. ### Some conceptual questions

Hey guys, so I have a few stats questions that are pretty broad and I was hoping you might be able to point out some of the major areas to focus on...

• Replies: 0
• Views: 2,377
05-30-2010, 05:13 PM
14. ### Normal Distribution help

Hi, I have the following problem given: Marks of a class follow a normal distribution. 22% of students got distinction marks (85 and above) and...

• Replies: 1
• Views: 1,982
05-30-2010, 08:34 AM
15. ### Working out RSS in matrix regression

Hey everyone Okay, I'm having a few problems. I'm fine with single variable matrix regression, using the formula \displaystyle RSS = \mathbf{e'e}...

• Replies: 0
• Views: 2,789
05-30-2010, 04:57 AM
16. ### Quantile-Normal Plot?

Hi folks, I've been looking for a detailed explanation of what the quantile-normal plot is, what it means, and how one is made (in general, not...

• Replies: 2
• Views: 4,485
05-30-2010, 04:11 AM
17. ### Help with statistics homework?

1). If the hypothesis test is conducted using α = .025, this means that: a. there is a 2.5% chance that the null hypothesis is true b. there is a...

• Replies: 1
• Views: 8,361
05-30-2010, 02:43 AM
18. ### testing for trends

Hi guys suppose we have variable x when we regress x on the linear time dummy variable t, the correlation coefficient is statistically significant...

• Replies: 1
• Views: 2,855
05-29-2010, 09:53 PM
19. ### P

what does P (capital p) stands for?? I know that p value is the probability but P ???

• Replies: 3
• Views: 2,528
05-29-2010, 08:33 PM
20. ### Geometric progression

Hello all, I just have a quick verification question. Suppose we have two variables x and y between zero and one. I want to take the sum from...

• Replies: 1
• Views: 3,181
BGM
05-29-2010, 12:17 PM
21. ### Why n-1 in variance

I don't understand why n-1 is used as the denominator to calculate sample variance. Could anyone explain with simple language and a very simple...

• Replies: 1
• Views: 2,796
05-28-2010, 09:58 PM
22. ### Hypothesis Test

If the null hypothesis is true, then distribution of test statistic, T is continuous with cdf F. The test rejects for large values of T. Let V denote...

• Replies: 2
• Views: 2,065
05-28-2010, 06:16 PM
23. ### Control variable

Hello, Im currently doing an analysis in a marketing-study, and i`m wondering how to use my data for a control variable in my model. I use SPSS....

• Replies: 0
• Views: 2,977
05-28-2010, 09:56 AM
24. ### Asymmetric Multivariate Regression?

Hi all, For asymmetric non-linear multi-variate cases what are some known methods to look at? I'm partial to WEKA and R and MatLab but am...

• Replies: 0
• Views: 3,482
Axl
05-27-2010, 11:53 PM
25. ### Differences between Stratified and Cluster random sample

What is the differences between Stratified and Cluster random sample

• Replies: 0
• Views: 2,864
05-27-2010, 07:16 PM
26. ### Random sampling

Random samples sampling in 1-PropZTest I'm doing a test on skittles and I took randomly took 10 small bags of skittles for my sample. What...

• Replies: 0
• Views: 2,447
05-27-2010, 06:47 PM
27. ### Random samples in 1-PropZTest

I'm doing a test on skittles and I took randomly took 10 small bags of skittles for my sample. What happens if I took just 1 big bag of skittles...

• Replies: 0
• Views: 2,426
05-27-2010, 05:53 PM
28. ### spss interpretation

Hi!! I have one quick question concerning spss interpration of the tables. In the output, I have a table with partial eta squared / adjusted r...

• Replies: 1
• Views: 3,286
05-27-2010, 04:02 PM
29. ### equation of the correlation and R^2

i have this results from a regression test i made that means that the equation is grade = 52.075 + books*5.738 right? also i want to...

• Replies: 1
• Views: 2,204
05-27-2010, 03:27 PM
30. ### Correlation Coefficient Equation

Lets assume my correlation is 1. Sx and Sy then become 1 How do I solve the following equation for xi ? R = summation((xi-xbar)*(yi-ybar))...

• Replies: 3
• Views: 3,031
05-27-2010, 02:47 PM
31. ### statistics project, percent insured and mortality

hi guys, boy am i glad i found this forum I was a stats major in college and I got a new job, its an administrative assistant job for a doctor....

• Replies: 3
• Views: 2,386
05-27-2010, 02:26 PM
32. ### Alpha size and power?

In statistical hypothesis testing, does a bigger size alpha mean a more powerful test? Is an alpha level of .05 more powerful than an alpha level...

• Replies: 1
• Views: 6,348
Boa
05-27-2010, 11:16 AM
33. ### Sample size for a pilot study

I am looking for advice on what size a sample should be for a pilot study. The purpose of the pilot is to test a questionnaire. The population it...

• Replies: 2
• Views: 8,026
05-27-2010, 11:14 AM
34. ### Difference between a covariate and fixed factor

Hi, in a linear mixed model, what is the difference between a covariate and a fixed factor ? The best explanation I've been able to find is: A...

• Replies: 3
• Views: 22,745
05-27-2010, 10:39 AM
35. ### When comparing mean of 3 samples withn a group of 42

I've a gigantic file and have many different analysis and performance statistics of a group of 42 operating units. I want to compare the mean of 3...

• Replies: 0
• Views: 1,931
05-27-2010, 09:20 AM
36. ### Loss of precision when data is grouped?

Hey everone.. I just had a quick stats question from an assignment for a class.. For the last assignment in our explanation we didn't do all that...

• Replies: 1
• Views: 2,836
05-27-2010, 08:07 AM
37. ### classification

Hi, I have the following problem: I have averaged the mean of pauses duration (which is a speech feature) across 4 picture that my participants...

• Replies: 2
• Views: 2,459
05-27-2010, 04:15 AM
38. ### t-scores

any psycology types know what a t-score is and how/when to use it. thanks

• Replies: 1
• Views: 2,482
05-26-2010, 10:13 PM
39. ### Roc

Have a question in mind: Assuming I have a study to test the responsiveness of mice to a drug and the marker I have to try to predict...

• Replies: 0
• Views: 2,185
05-26-2010, 09:55 PM
40. ### Three Way ANOVA

Hello there, I am currently a PhD student in HCI. As part of the data analysis, I want to examine the effects of four independent variables (all...

• Replies: 3
• Views: 3,035
05-26-2010, 04:29 PM
41. ### Simultaneous Equations Models

Hi everyone, i have been sitting infront of my desk for hours trying to figure this out. The question is: Estimate the reduced form equations by...

• Replies: 0
• Views: 2,133
05-26-2010, 12:13 PM
42. ### statistic data for regression

Hi guys, does anyone know any data online, not the samples in SPSS in order to practice my skills in regression? Actually I would like to use some of...

• Replies: 0
• Views: 2,966
05-26-2010, 12:08 PM
43. ### Making conclusions based on samples of samples.

If you take a sample of 1000, and then you determine a segment of the sample, can you really make any conclusions about the segment? For example:...

• Replies: 0
• Views: 2,281
05-26-2010, 11:13 AM
44. ### Formula for the p-value in probability theory notation?

Give a formula for the p-value in probability theory notation for a one-sided test, where H1: μ > μΗ0. Is this right? pr(T ≥ t)

• Replies: 0
• Views: 4,034
05-25-2010, 09:24 PM
45. ### effect size

Hi everyone, how do you calculate cohen<s d with these values? Npairs=50 r=0.6 t=3.5 The answer is d=0.44 but i dont know how to get there?? I...

• Replies: 2
• Views: 3,894
Boa
05-25-2010, 04:56 PM
46. ### Estimating future revenue

My boss has asked me to provide a best estimate for future revenue based on a number of *potential* contracts which are worth varying amounts of...

• Replies: 1
• Views: 3,276
BGM
05-25-2010, 01:31 PM
47. ### curse of dimension problem

Hi all, I have a question about the curse of dimension problem. I read that the principle component analysis is unstable when the number of...

• Replies: 4
• Views: 2,559
05-25-2010, 09:46 AM
48. ### Fisher's exact

Hi, just found this forum :wave: Have a quick (and probably silly) question about Fisher's exact test - is this purely for a 2x2 table, or can it...

• Replies: 0
• Views: 3,306
05-25-2010, 09:09 AM
49. ### Number of Respondents Higher

I had a survey conducted, in which I was expecting a 20% response. However, the responses from some places has been more positive than expected ad...

• Replies: 0
• Views: 1,848
05-25-2010, 08:45 AM
50. ### Moment??

Hi there, I am reading the part called Moment, Moment Generating funtions and product moments none of these are quite undestandable to me with any...

• Replies: 0
• Views: 2,374
05-25-2010, 06:35 AM
51. ### Simple percentage question.

Hi guys, I know this is a pretty simplistic question for you guys but I really need you're help. I am completing this particularly hard university...

• Replies: 0
• Views: 2,047
05-25-2010, 01:06 AM
52. ### CI question

Hello i have the following question in a homework assignemnt: In one hospital undertaking heart transplants, 34 of 265 patients transplanted...

• Replies: 1
• Views: 1,861
05-25-2010, 12:17 AM
53. ### What test is best!

Hopefully this is a quick question for all you statistic gurus! If I am using the same survey to measure the same respondents to a 10 session...

• Replies: 1
• Views: 2,045
05-24-2010, 09:12 PM
54. ### infinite lag distribution proof

asdddddddddddddddddddddddddd

• Replies: 1
• Views: 3,824
BGM
05-24-2010, 11:57 AM
55. ### Independent PDF

Let U1 and U2 be independent observations from a uniform distribution with PDF fu(U) = 1 0<u<1 The question is to write the joint PDF,...

• Replies: 1
• Views: 3,016
05-24-2010, 08:59 AM
56. ### What type of testing to do on the statistic I have?

Not quite sure on the reasoning of which tests to use. Would like some help. For one of the questions, out of 50 games Frank has played 60% of the...

• Replies: 1
• Views: 2,813
05-24-2010, 01:48 AM
57. ### conducting a two-sided test at the α= 0.05 level of significance

Hey guys i assume this is probably a really basic question, but its giving me trouble. I have only recently taken up stat study and have a limited...

• Replies: 5
• Views: 97,201
05-24-2010, 01:17 AM

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