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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: 66,871
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: 196,996
07-16-2014, 11:01 AM
1. ### Help Me Please!!!!

Here are the 3 qustions, which I need help understanding how to do them!!! 1. Assume you have administered a standardized anxiety scale to a...

• Replies: 1
• Views: 2,309
03-06-2006, 08:46 AM
2. ### Likert scale

Hi all, I am a newbie to stats and I am currently on a project and I like to ask smthing about likert scale. My question tests on user's...

• Replies: 2
• Views: 3,284
03-06-2006, 09:17 AM
3. ### A biomedical experiment problem

Dear people, I am currently doing a biomedical study where there are 4 different treatment. Sham operation, A, B and (A+B). Each treatment have...

• Replies: 3
• Views: 2,261
03-06-2006, 09:13 PM
4. ### Z-Score Help

I have the following question regarding z-score: The mean of a set of data is 0.92 and it's standard deviation is 2.42. Find the z- score for a...

• Replies: 2
• Views: 4,027
03-07-2006, 12:45 PM
5. ### Probability

A study of consumer smoking habits includes 177 people in the 18-22 age bracket (48 of whom smoke), 146 people in the 23-30 age bracket (31 of whom...

• Replies: 1
• Views: 3,681
03-07-2006, 02:47 PM
6. ### Probability

100 employees of a company are asked how they get to work and whether they work full time or part time. The figure below shows the results. If one of...

• Replies: 1
• Views: 7,104
03-07-2006, 08:11 PM
7. ### 2 way cross classification ANOVA

hey there, I need to suggest why when partitioning the total sum of squares in a 2 way cross classification ANOVA into the individual...

• Replies: 1
• Views: 3,832
03-07-2006, 08:16 PM
8. ### Not sure what mathmatical route to take

I am trying to compare the quantities and types of stone artifacts between four different archaeological excavation units from one archaeological...

• Replies: 5
• Views: 2,167
03-08-2006, 01:35 AM
9. ### Normal or not?

hi, my first post on this site. im in need of desperate help. currently going through my dissertation process which includes stats which im hopeless...

• Replies: 5
• Views: 1,896
03-08-2006, 09:46 AM
10. ### unequal and unknown variances

Hi, We have a question on our homework that asks us to discuss the difficulty with unknown and unequal variances with respect to a t-distribution. I...

• Replies: 0
• Views: 2,613
03-08-2006, 06:44 PM
11. ### confidence interval plus some

Hi I'm working on a question that asks me to find the constant c so that c(Xbar-X(n+1))/S has a t distribution. We're given that X1, X2, ......Xn,...

• Replies: 5
• Views: 2,241
03-08-2006, 07:45 PM
12. ### Dealing with nonresponses

What can be done to compensate nonresponses in the sample (Aside from eliminating them, that is.)? Should they always be excluded from the sample...

• Replies: 8
• Views: 2,947
03-08-2006, 11:42 PM
13. ### Loglinear analysis abnormality

Let me first explain the dataset, before I explain the abnormality (well according to me anyway).. I have 4 factors: Organisation, colour, display...

• Replies: 2
• Views: 2,508
03-09-2006, 05:39 AM
14. ### Which categorical statistic? Help please

Hi, For my project I am using statistical methods to create useful information in a spreadsheet. I have a spreadsheet with types of products at...

• Replies: 1
• Views: 2,144
03-09-2006, 03:53 PM
15. ### Isolating an effect for a distribution

Hello stats gurus, I'm working on a project that has been perplexing me for a bit... I have 24 histograms (one for each hour of the day). ...

• Replies: 7
• Views: 3,236
03-10-2006, 09:11 AM
16. ### Regression equation

Hey everyone, I'm a social scientist not a statistic, so forgive me my basic question. does anyone here know a good tutorial on regression...

• Replies: 1
• Views: 3,033
03-10-2006, 10:15 AM
17. ### question about t-test

Im a little confused about the difference between a t test for one sample, for two independent sample, and two related samples. For this problem: ...

• Replies: 3
• Views: 2,579
03-10-2006, 04:20 PM
18. ### Confidence interval

John, Thanks for defining (interpreting) confidence intervals in language that I can understand! I am using a textbook that is really confusing to...

• Replies: 4
• Views: 2,165
03-11-2006, 05:02 PM
19. ### Stats Report

I have to write a 500 word stats report on the following data: Batch 1 Batch 2 Min Value 26.1 26.1 Q1 29.6 28.4 Median 31.2 30.3...

• Replies: 0
• Views: 2,176
03-12-2006, 07:45 PM
20. ### confidence and margin of error

im not sure if im reading this question correctly? A political action committee is interested in finding out what kind of popular support they...

• Replies: 2
• Views: 3,382
03-12-2006, 08:29 PM
21. ### sample size

Im stuck again!! scores on a certain test are normally distributed with a varience of 82. A researcher wishes to estimate the mean score...

• Replies: 1
• Views: 3,620
03-13-2006, 12:05 AM
22. ### variables help

hey i know this is a basic question but i am stuck and not sure what is the right answer "Match the following variables on the left with their...

• Replies: 1
• Views: 1,963
03-14-2006, 09:18 AM
23. ### confidence interval

I have a problem I would like to know if I am doing it right. Use the degree of confidence and sample data to construct a confidence interval for...

• Replies: 2
• Views: 5,622
03-14-2006, 09:51 AM
24. ### r values, which section?

Having conducted various Pearsons tests to test for relationships, i have noted the r value for each of the variables tested. I understand that +1...

• Replies: 1
• Views: 1,936
03-14-2006, 09:43 PM
25. ### confidence interval

With the following data (male): Mean 47.281 Stand. E 1.615 Stand. D 11.53 Count (N?) 51 I estimated the 95% confidence interval for the mean...

• Replies: 1
• Views: 2,158
03-14-2006, 11:08 PM
26. ### margin of error

Find the minimum sample size you should use to assure that your estimate of p^ will be within the required margin of error around the population p....

• Replies: 3
• Views: 6,083
03-15-2006, 06:26 AM
27. ### Principal Component Analysis

Are the sample variances of principal components always positively biased compared to population variances? I know that the first principal component...

• Replies: 0
• Views: 3,609
03-15-2006, 06:53 AM
28. ### Questions on Correlation Concepts

Hypothetically, say that I've found that the score for some physical health test (T) is strongly correlated to the time I spend working out in a gym...

• Replies: 2
• Views: 2,866
03-15-2006, 07:04 AM
29. ### t-test

I'm confused about when to use a t test for two independent samples and when to use a repeated measures t test. When there is a pacebo group in an...

• Replies: 1
• Views: 1,910
03-16-2006, 08:49 AM
30. ### Satistics skewness

if statistics skewness is -1.401 for a small sample of 17.what does it mean? Does it mean it is skewed to the left? or to the right? Is -1.401 a...

• Replies: 1
• Views: 1,932
03-16-2006, 09:48 AM
31. ### Hypothesis testing Help

Help!! Got a problem I'm trying to work out and could use your assistance.... "Hypothesis Testing 3. The director of admissions at the...

• Replies: 1
• Views: 2,227
03-16-2006, 09:58 AM
32. ### confusing.

on last problem of a study guide for statistics test. having problems figuring it out. is this binomial distribution or random variable and how do I...

• Replies: 1
• Views: 2,091
03-16-2006, 03:26 PM
33. ### comparing and contrasting 95% CIs

I have to do the following: Compare and contrast the 95% CI for the male and female faculty members. What is the significance of whether or not the...

• Replies: 1
• Views: 1,825
03-16-2006, 08:14 PM
34. ### Calculating a binomial probability

Hello, I have a distribution of observed B values that vary with x. I am fitting a distribution to this and do not have a problem with this. ...

• Replies: 0
• Views: 2,429
03-17-2006, 07:20 AM
35. ### p value

when finding p value for chi square test or t test, does it matter whether it's a one sample or two sample test? EX: in order to find the p value...

• Replies: 1
• Views: 2,255
03-17-2006, 12:07 PM
36. ### width of 90% CI and 95% CI

Why is the width of the 90% CI different than that for the 95% confidence interval? My work: The width of the 90% CI differs than that of the 95%...

• Replies: 1
• Views: 8,147
03-17-2006, 06:11 PM
37. ### need to know if I am on the right track

Hi, working on a study guide for a test...have a problem that deals with binomial distribution. want to know if I am on the right track here. here...

• Replies: 4
• Views: 2,563
03-17-2006, 08:57 PM
38. ### Basic question regarding methods

Anyone: 1. How many different statistical methods/tests are there? Hundreds? thousands? (ANOVA, chi-square, etc.) 2. Why are there so many...

• Replies: 3
• Views: 1,932
03-18-2006, 05:28 PM
39. ### Power analysis

While researching, I came across the term "power analysis". I am not sure if this term is: 1. Analysis software? 2. Another type statistical...

• Replies: 1
• Views: 2,630
03-19-2006, 01:16 PM
40. ### r and p in regression

Hi John: I am still not clear about a regression graph. When r is 0.66 and p-value is 0.02, this is moderate to strong correlation and real,...

• Replies: 17
• Views: 4,005
03-19-2006, 01:38 PM
41. ### statistically significant

I was asked the following: Is the average salary for female faculty members significantly different from the national average public school salary...

• Replies: 2
• Views: 3,432
03-19-2006, 03:10 PM
42. ### estimate/probability

With this information: Within the state,about 10.47% of faculty members serve as admin. or receive admin. salary supplements. Female with admin...

• Replies: 0
• Views: 1,813
03-19-2006, 03:22 PM
43. ### stuck on sample size determination

hi, im working on verifying that a sample is large enough. i have nielsen data showing that 32.5% of a n=2842 sample of women 25-54 (of whom the...

• Replies: 2
• Views: 2,100
03-19-2006, 07:24 PM
44. ### Can propensities and percentages be compared?

Hi, I'm new to the world of statistical modelling and have recently have been given a model to update. The model currently assigns a propensity...

• Replies: 0
• Views: 2,014
03-19-2006, 07:25 PM
45. ### one sample z test

Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

• Replies: 0
• Views: 1,827
03-21-2006, 04:14 PM
46. ### one sample z test

Ho=mu(males)=mu(state prop.) Ha=mu(males)<>mu(state prop.) The critical Z-values for .05 is 1.96 and .01 is 2.57, respectively. State-10.47...

• Replies: 0
• Views: 1,986
03-21-2006, 04:16 PM
47. ### Writing out stats

i have conducted various t tests and understand that i need to state the t value, d.f value and p value in my results section above my graph. Do...

• Replies: 1
• Views: 2,552
03-24-2006, 12:36 AM
48. ### level of measurement.

Hi john, I am real confuse when I see zero in the data, in the following I am thinking,:confused: is ordinal but when I see the zero it seems it...

• Replies: 2
• Views: 2,650
03-24-2006, 10:56 AM
49. ### Stats Project, Can Anyone Help

I've got a stats project to do for uni about obtaining accurate blood pressure readings. Can anyone have a quick look and maybe tell me where to...

• Replies: 3
• Views: 2,704
03-24-2006, 02:13 PM
50. ### do not understand evidence of a mean

My problem states: IQ test scores of 31 seventh-grade girls in a Midwest school district. IQ scores follow a Normal distdribution with standard...

• Replies: 1
• Views: 4,391
03-24-2006, 03:27 PM
51. ### Pre-test questions.

Greetings. I have 3 questions I need answered in preparation of my final. I could really use the help as I am so close to being ready to taking the...

• Replies: 3
• Views: 2,600
03-25-2006, 08:35 AM
52. ### regression on count data?

Hi, I want to know the if there is a relation between a treatment (independent var) and developmental time (dependent variable). The dependent...

• Replies: 1
• Views: 2,366
03-25-2006, 03:21 PM
53. ### F test

With this information: F-Test Two-Sample for Variances 1 0 Mean 43.4333871 48.65021053 Variance 95.63978493 159.8278372...

• Replies: 0
• Views: 1,767
03-26-2006, 10:48 AM
54. ### Help with almonds!!!

hey guys i am new here and am having trouble with this problem... Consider the market for almonds. Assume that quantity supplied is a linear...

• Replies: 0
• Views: 1,753
03-26-2006, 09:11 PM
55. ### Tukey results

I was wondering if anyone could provide any assistance in showing me how to report Tukey HSD test results in a table, e.g., what test statistic to...

• Replies: 1
• Views: 9,543
03-27-2006, 11:52 AM
56. ### Cochran-Armitage Trend Test

Hello. I have a question on interpreting the results of a Cochran-Armitage Trend Test. I ran the data below in SAS to see if the NH-Black...

• Replies: 0
• Views: 5,213
03-28-2006, 04:19 PM

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