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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: 196,522
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: 66,601
09-30-2005, 09:44 AM
1. ### Allocating Items to a Limited Number of Slots

Hi, Let's say that I have a small retail shop that has slots available for only 5 types of products. However, I also have a warehouse located...

• Replies: 0
• Views: 2,946
01-06-2007, 08:43 AM
2. ### ANCOVA Power calculation?

Hi. I would be very grateful if anyone could tell me how to do a power calculation for an Analysis of Covariance study design. I have Cohen's tables,...

• Replies: 0
• Views: 5,830
01-06-2007, 07:26 AM
3. ### Normal Approximation to the Binomial Dist

More than 200 billion grocery coupons are distributed each year for discounts exceeding \$84 billion. However, according to a report in USA Today,...

• Replies: 3
• Views: 4,548
ssd
01-06-2007, 02:38 AM
4. ### Piecewise versus fitting to a distribution

Question: When defining a set of data...is it "better" or more valid to use actual percentages within a set range or to fit the data to a...

• Replies: 0
• Views: 2,694
01-04-2007, 05:09 PM
5. ### is there a way to type mathematical expressions in this forum?

hi, Is there a way to type mathematical formulas - definite integrals, subscrips, superscripts, bars etc. in the posts? If yes, could you give an...

• Replies: 2
• Views: 2,170
01-04-2007, 11:44 AM
6. ### Any help would be greatly appreciated

I am desperate for help as my dissertation has to be handed in very soon and i am totally baffled with the data analysis section. I have carried...

• Replies: 3
• Views: 3,061
01-03-2007, 05:58 AM
7. ### Durbin Watson statistic

Hi all, I would like to calculate DW critical values (up and down) for 5200 samples. I have got 3rd, 4th, 5th and 6th order polinomial equations....

• Replies: 1
• Views: 4,580
01-02-2007, 11:11 PM
8. ### Hypothesis Testing Help

I have read everything I can on hypothesis testing but I am struggling with this one question. I just need someone to explain it to me. Just where I...

• Replies: 1
• Views: 2,792
01-02-2007, 02:21 AM
9. ### Central limit theorem

It's been years since I've taken a statistics course. I recall taking several of them. But, apparently I took them to little good effect, since a...

• Replies: 1
• Views: 3,240
01-02-2007, 12:22 AM
10. ### How to detect 'secondary' correlations

As part of a Phase I SBIR study, we ran some experiments using human subjects. Without bothering with the specifics, we had a group of people...

• Replies: 0
• Views: 1,967
01-01-2007, 03:31 PM
11. ### Normal Distribution Help

Question: The probability that a person has an unlisted telephone number is 0.15. The district manager of a political action group is phoning...

• Replies: 2
• Views: 2,591
12-31-2006, 09:43 AM
12. ### Help! One-way within-subjects ANOVA & retrospective power analysis...

Hey, I'd really appreciate any help you could give me on this. Basically, my design is w-s, one IV, 3 levels looking at word recall and...

• Replies: 1
• Views: 3,401
12-30-2006, 05:20 PM
13. ### Independent samples T Test or Chi-Square

Hello! I'm writing masters degree and cannot decide which method to use. :confused: Hypothesis 1:

• Replies: 3
• Views: 5,170
12-30-2006, 05:09 PM
14. ### Which Statistical Methoded work best???

I would like to track the success and progress of care given for a severly disabled child. Layout example I thought would be good. 1=poor...

• Replies: 0
• Views: 1,876
12-29-2006, 09:47 PM
15. ### Comparing multiple catagories care progress

I would like to track the success and progress of care given for a severly disabled child. Layout example I thought would be good. 1=poor...

• Replies: 0
• Views: 1,939
12-29-2006, 07:25 PM
16. ### statistics, pls help im stuck

Question A major financical institution would like to predict its loan degault rate based on the interest rate it charges. A random sample of...

• Replies: 2
• Views: 2,375
12-29-2006, 11:25 AM
17. ### Help needed for spatial statistics - linearity problem

I am a final year Environmental Geoscience BSc student, currently engaged in a dissertation project on synsedimentary fracturing in carbonates. I...

• Replies: 0
• Views: 1,714
12-28-2006, 05:59 AM
18. ### Correlation. Im stuck, Pls help

Im in desperate need and im stuck: Can someone plsease tell me where im going wrong with this question. Calculate the sample correlation between...

• Replies: 3
• Views: 2,405
12-27-2006, 05:39 PM
19. ### degress of freedom aren't explained well

Why do we divide with n-1 instead of n, when population variance is estimated from the sample? Yes, sample will have less variability, so our...

• Replies: 2
• Views: 2,722
12-26-2006, 01:41 PM
20. ### Chance

I am not exactly sure of the correct statistical method to execute this problem" A fair coin was flipped 10 times, compute the chance that the...

• Replies: 2
• Views: 2,171
12-22-2006, 12:53 AM
21. ### strenght of relationship and nonlinearity of r

If one goes from r (correlation coefficient) 0.2 to 0.3 (0.1 difference) or from 0.8 to 0.9 (same difference) the strenght of the relationship is not...

• Replies: 0
• Views: 3,089
12-21-2006, 11:38 PM
22. ### Comparing two proportions in dependent samples

Hello, I am interested in comparing the precision of two classification models, A and B, when I have only the following information: The number...

• Replies: 0
• Views: 6,286
12-21-2006, 09:08 AM
23. ### Another proportion question-help much appreciated

Say I know 3000 people were canvassed by a political party, 2200 of them went out to vote. Of the 7000 not canvassed, 4000 went to vote. What...

• Replies: 2
• Views: 2,415
12-21-2006, 08:46 AM
24. ### Hypothesis Test

I am trying to understand the hypothesis test - specifically, which side of the normal curve the rejection region should lie and what my answer...

• Replies: 1
• Views: 1,957
12-20-2006, 10:20 PM
25. ### Determing sample size

Any help appreciated!!! What is the formula I need to use if I want to determine sample size for an unknown population (the number of workers)...

• Replies: 0
• Views: 1,966
12-20-2006, 06:17 PM

I have this question: Men are eligible for this club if they are 74in tall. what percentage of men are eligible to join the club. also the mean of...

• Replies: 2
• Views: 4,883
12-20-2006, 04:28 PM
27. ### How large a sample do I need?

I want to test a postcard. I have a list of 15,000 names, 4,000 of whom have already signed up for information. I want to mail an offer to some...

• Replies: 1
• Views: 3,302
12-19-2006, 03:02 PM
28. ### Kolmogorov-Smirnov Z - how to calculate effect size??

Hi there, A similar question to Laura's- how do I calculate effect sizes for the Kolmogorov-Smirnov Z? Is the Z value given by SPSS what I need,...

• Replies: 0
• Views: 8,750
12-19-2006, 07:32 AM
29. ### S.O.S. - effect size indexes for nonparametric tests

Hi there folks, I am carrying out a study (repeated measures design) employing nonparametric statistics ( Friedman's and Wilcoxin signed rank...

• Replies: 1
• Views: 9,491
12-19-2006, 07:23 AM
30. ### Binomial Distribution, I think HELP!!!

I have a problem that states: An insurance company will insure a \$75,000 Hummer for its full value against theft at a permium of \$1,500 per year....

• Replies: 1
• Views: 6,276
12-18-2006, 03:14 PM
31. ### Help!

I have been working on this for almost 24 hours! Can someone please help me with this problem... here's what i have gotten so far: this is for...

• Replies: 1
• Views: 2,048
12-18-2006, 02:30 PM
32. ### Confirmatory Factor analysis

Perhaops this question is a little too advanced for this forum, but I will give it a try. I am doing CFA in AMOS and I am getting rather bad fit...

• Replies: 0
• Views: 2,505
12-18-2006, 05:02 AM
33. ### Help?!

I have a few questions that I'm not sure how to approach, or why it's wrong (or what is the correct answer for that matter. To begin: I have no...

• Replies: 0
• Views: 1,710
12-17-2006, 08:58 PM
34. ### Conditional Pobability

_ _ Can anyone tell me how to calculate P(AB) , P(A), and P(B/A) when all I have _ is P(B) ...

• Replies: 3
• Views: 2,280
ssd
12-17-2006, 08:09 AM
35. ### Test for proportion

Hi. Example 1: Say I have a sample of rolls of a dice which may be 'uneven' Say I have 10000 rolls, 1000 came up 1, 1000 came up 2, 2000 came up...

• Replies: 2
• Views: 2,574
12-17-2006, 07:59 AM
36. ### Regression Equation question

Can you tell me, if you have a regression equation with two partial regression coefficients (slopes), can you guestimate the p-values for each...

• Replies: 1
• Views: 2,628
12-15-2006, 06:33 PM
37. ### Advice on type of test to use

Hi guys. I have performed a study looking a 2 groups of people and how a particular blood test may be related to a disease. My two groups are 1)...

• Replies: 1
• Views: 2,348
12-15-2006, 06:31 PM
38. ### Non zero P value for T test

Here is a basic question. A person I know has a dataset with two columns. When they do a normality test for each column, it passes. One they do a...

• Replies: 2
• Views: 2,820
12-15-2006, 08:25 AM
39. ### Multicollinearity - Variance Inflation Factors

Hi I am doing a linear regression coursework project and am having some difficulties I hope someone can help me with. I am analysing the VIFs for...

• Replies: 0
• Views: 2,842
12-15-2006, 08:12 AM
40. ### Comparing Correlations/Regressions?

Hi, I just have a quick question: I am doing a bit of EDA on some biodiversity data in regards to species richness of various taxa in relation to...

• Replies: 0
• Views: 1,988
12-14-2006, 04:20 PM
41. ### help with streamflow data

I have a several-step problem here and not sure how to go about it. Any advice would be appreciated. I have streamflow data (daily average...

• Replies: 0
• Views: 2,004
12-14-2006, 04:16 PM
42. ### need clarification to an earlier post/reply

Hi ...I would like clarification on one point from a reply I got from JohnM. I replied to his reply asking for clarification - but have not heard...

• Replies: 0
• Views: 2,012
12-14-2006, 06:10 AM
43. ### Confused with the wording Ho H1 claim

At a small college it was reported that no more then 20% of the students commute more then 10 miles. A random sample of 100 students showed that 24...

• Replies: 2
• Views: 4,033
ssd
12-14-2006, 06:07 AM
44. ### Which test should I use?

Hi everyone, some help please? I have performed 8 chemical experiments in which the result of each is a percentage. 4 were done under 1 condition...

• Replies: 3
• Views: 2,317
ssd
12-14-2006, 02:18 AM
45. ### level of significance

A researcher claims the mean IQ of students in the Faculty of Medicine exceeds that of students in other faculties. It is known that the mean IQ of...

• Replies: 1
• Views: 3,637
ssd
12-13-2006, 06:16 AM

Can someone help me on these statistic questions. (FYI:i am not really good with probability..) 1.Family size can be represented by the random...

• Replies: 2
• Views: 3,957
ssd
12-13-2006, 06:04 AM
47. ### Respondents belong to >1 group-what do I do??

I am using a chi-square test to look for group differences in assessment use between four organizations bound by ethics codes. Some of the...

• Replies: 1
• Views: 2,222
ssd
12-13-2006, 03:51 AM
48. ### probability density function of dependent variables

Hi, I am currently trying to derive the joint probability density function for two random dependent variables each with a marginal distribution...

• Replies: 1
• Views: 5,420
ssd
12-13-2006, 03:17 AM

Hi, I have a question: in a hierarchical regression when subsequent variables (X3 and X4) that are added later on results in the original variable...

• Replies: 1
• Views: 2,241
ssd
12-13-2006, 03:09 AM
50. ### Correlation and Regression on Excel?

HOW?! a. Draw scatter plot for the variables b. Compute the value of the correlation coefficient. c. State the hyptothesis. 12. A medical...

• Replies: 6
• Views: 4,149
ssd
12-13-2006, 02:48 AM
51. ### Does this finding seem odd to you? Help!

I need some advice. I am finding strange bivariate correlations among my vairables of interest... there are strong patterns of findings that appear...

• Replies: 1
• Views: 2,872
ssd
12-13-2006, 02:36 AM
52. ### Wilcoxon signed rank test help

Hi - I have data that I wish to perform this statistical test upon but there are a few things i am unsure about, i hope somebody can help! The...

• Replies: 0
• Views: 4,023
12-13-2006, 12:14 AM
53. ### Peak over threshold (POT)method

I am trying to understand how the POT method works in estimating extreme events. Does anyone have an idea?

• Replies: 0
• Views: 4,918
12-12-2006, 05:26 PM
54. ### Confidence Interval: Adjusted Wald Method

If I am conducting an experiment on 10 people and all 10 performed a task successfully, I want to know how to determine the confidence interval. I...

• Replies: 4
• Views: 16,716
12-12-2006, 04:59 PM

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