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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: 66,823
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: 196,899
07-16-2014, 11:01 AM
1. ### Measure of representativeness

Suppose I have State | Sample | Population s1 | n1 | N1 s2 | n2 | N2 .. | .. | .. Is the correlation between (n1 n2 ..) and (N1 N2 ..) a...

• Replies: 0
• Views: 3,475
01-31-2007, 06:25 AM
2. ### Principal Components Analysis

Can somebody confirm whether the variables used in a Principal Components Analysis, such as on SPSS, ALL need to be interval level? I have 2...

• Replies: 1
• Views: 4,537
01-31-2007, 10:24 AM
3. ### calculating means and standard deviation from confidence interval

Is there anyway to calculate mean and standard deviation if we are given the 95% confidence interval? I have the following interval 1.339-13.833 I...

• Replies: 2
• Views: 56,920
01-31-2007, 05:53 PM
4. ### Contingency Tables

I am doing AS Level Statistics, i just finished S1 and started doing S2 however, my teacher is not that experienced at teaching A level, so...

• Replies: 1
• Views: 5,931
02-01-2007, 11:04 PM
5. ### Standard deviation for a binomial distribution

There are N boxes which can be empty or filled with balls. The probability of filling each box with a ball is p. According to binomial...

• Replies: 0
• Views: 1,771
02-02-2007, 09:39 PM
6. ### Estimating Proportions

Does anyone know any good sites fro explaining estimating proportions? I am clueless as to how to do this. My notes are not helping me. Is there a...

• Replies: 2
• Views: 2,436
02-02-2007, 09:51 PM
7. ### not sure what to do! multiple DVs

Hi there I have a data set which includes 6 continuous DVs (job satisfaction, 3 different kinds of commitment and work-life conflict) and 1...

• Replies: 0
• Views: 1,571
02-03-2007, 06:54 PM
8. ### Uncertainty analysis

Hello everybody, I'm not sure whether this is the right place to ask, but I will try my luck here. This question concerns uncertainty...

• Replies: 0
• Views: 2,324
02-04-2007, 04:33 AM
9. ### non-parametric

Help please I need to provide a non parametric test with two independant samples the wilcoxon is the wrong test and there is not enough data for...

• Replies: 2
• Views: 2,659
02-04-2007, 07:37 AM
10. ### Sample variance s^2?

Can anyone give me a definitive description of s^2, sigma^2 and sxx for regression? I know that we can obtain an estimate of the true population...

• Replies: 1
• Views: 3,928
02-05-2007, 12:30 AM
11. ### standard error of ratio of coefficients

hi all, I am interested in the ratio of two regression coefficients. Is it possible to obtain a standard error for such a ratio? eg: I...

• Replies: 2
• Views: 11,034
02-05-2007, 12:48 AM
12. ### variance in regression

Hi, Can someone help me fugure this out regarding simple linear regression. Firstly B is beta and A is alpha We are told that y = A + Bx + e...

• Replies: 0
• Views: 4,988
02-05-2007, 12:50 PM
13. ### homework help

I have to conduct a mann whitney test but i have a small amount of data, it keeps telling not enough data. Help please kala:shakehead

• Replies: 0
• Views: 2,862
02-05-2007, 03:15 PM

Hi! For my master thesis I need to do a lot of statistics: I have done behavioural and acoustic research on a group of 8 captive dolphins. A...

• Replies: 0
• Views: 1,711
02-06-2007, 05:54 AM
15. ### Homework HELP

Did I do this right?:confused: The percentage of American men who say they would marry the same woman if they had to do it all over again is 80%....

• Replies: 1
• Views: 4,253
02-06-2007, 07:38 AM
16. ### Not sure how to analyse this Rank-Order Data

Good Day to All, I am not sure where to begin in analyzing some data I have. DATA: Sample population N=100 Looking at factors that helped or...

• Replies: 1
• Views: 5,518
02-06-2007, 03:43 PM
17. ### Error bars - ratio of averages

Hi I was just wondering if anyone could help me. I have 4 values for growth rates of a yeast with no treatment, and 4 values of the growth rate...

• Replies: 0
• Views: 5,172
02-07-2007, 09:34 AM
18. ### Comparing temperature measurements between sensors?

Hi, I want to statistically compare 3 different temperature sensors (3 different manufactures) to determine which sensor gives the best...

• Replies: 0
• Views: 2,467
02-07-2007, 11:00 AM
19. ### Trouble figuring out descriptives in data

Hi everyone I have a major stats exam next week for a job interview. I am struggling on a concept with descriptives stats which is probably very...

• Replies: 0
• Views: 2,019
02-07-2007, 11:14 AM
20. ### sample size help. - for ph.d.non.stats person wanting to learn!lol

i want to run a bunch of anovas to compare means between two groups. There are approximately 135 items, composing 5 scales. I'm wondering how to...

• Replies: 1
• Views: 4,004
02-07-2007, 02:29 PM
21. ### Statistics for small sample sizes

I'm wondering if anyone can help. I have experimental data for a number of groups, but the sample size within each group is only around 5. I am...

• Replies: 1
• Views: 2,774
02-07-2007, 02:35 PM

Dear All I am going nuts trying to work this out.... I'm a Psych. grad student trying to check to see what sample size I would need in the...

• Replies: 1
• Views: 12,037
02-07-2007, 04:57 PM

I don't really know how to tell what test to use with this questio. I think that it is ttest or z. could you please help. I have done so much reading...

• Replies: 2
• Views: 5,282
02-07-2007, 05:33 PM
24. ### intermediate stats help (ANOVA/source table)

Hello, So I have spent the better part of 2 hours looking at this problem, notes, websites and my textbook attempting to figure out how to do...

• Replies: 1
• Views: 3,869
02-07-2007, 06:33 PM
25. ### Parametric or non-parametic tests?

I know that you use a nonparametric test if the skewness statistic is twice the standard error statistic but in this case do you ignore the sign?For...

• Replies: 1
• Views: 3,577
02-07-2007, 06:36 PM
26. ### Binomial Distributions

Hello there, Finally got the hang of the this from by using my Excel. Although, I would love to do it on my Ti86 and by the formula method. ...

• Replies: 1
• Views: 2,763
02-07-2007, 11:39 PM
27. ### Analyzing daily data by month and day of week

Hi :) So I've got this data - the number of parking tickets issued, per day, in a certain locale over one year. Overall, then, n=365. I am...

• Replies: 0
• Views: 2,854
04-16-2007, 12:39 AM
28. ### System test scripts - need a statistical model

My company develops and runs system test scripts, containing multiple steps each, on various ERP systems like Oracle. I have been asked to develop a...

• Replies: 0
• Views: 2,491
04-16-2007, 07:08 AM
29. ### Comparing two percentages for significance

Hello...this was posted but was lost recently. I am trying to figure out the best method to compare two percentages for significance. I am...

• Replies: 1
• Views: 34,180
04-16-2007, 09:48 AM
30. ### Probability question

Each bottle must contain 300ml. Mean: 298ml Std Dev: 3ml What is the probability that a 35 bottle sample will have 295ml? This has been...

• Replies: 2
• Views: 3,818
04-16-2007, 10:04 AM
31. ### Help with Panel data estimation

I have a Question regarding panel data linear regression, should I lag my independent variables in the estimation equation like one normally does in...

• Replies: 0
• Views: 2,405
04-16-2007, 11:18 AM
32. ### Simple Post-hoc Sample Size Analysis-for two means

Hi, I have a simple problem. I've run some preliminary tests (t-tests) comparing two samples. I was unable to detect any significant difference...

• Replies: 0
• Views: 2,412
04-16-2007, 11:37 AM
33. ### Help with a normal distribution problem

I'm studying for a test later today and I've run across a problem that I have no idea how to do. The info I have is Mu = \$6,000 sigma = \$1200. ...

• Replies: 3
• Views: 3,314
04-17-2007, 07:36 AM
34. ### trying to find a means of proving my statement

Hi all, I recently claimed that having promotions at baseball games would result in increased attendance. Unfortunately, my stats professor...

• Replies: 2
• Views: 2,240
04-17-2007, 09:51 AM
35. ### EM-Likelihood

Could someone please explain Expectation-Maximization in terms of missing data imputation in practical (rather then theoretical) terms? I'm having a...

• Replies: 0
• Views: 2,624
04-17-2007, 11:02 AM
36. ### forecasting--how to?

How would I go about setting up a good forecasting model? I have been asked to forecast the number of calls a call center receives. I have been...

• Replies: 0
• Views: 1,864
04-17-2007, 04:57 PM
37. ### Average

Hi, I have some diary data (Day1, Day2, Day3, Day4, Day5). If I am trying to calculate Average-Days and, for example, Day3 is missing...do I...

• Replies: 4
• Views: 2,527
04-18-2007, 07:38 AM
38. ### non normal distribution and regression

Hi, If the distribution of y variable is not normal. (skewness equal to 1.1 and kurtosis to 8.2) can i run a simple linear regression of the y on...

• Replies: 1
• Views: 8,570
04-18-2007, 11:20 AM
39. ### Statistics Question

I'm a programmer/database developer building financial reports for various product lines. I can break down revenue data by various categorical...

• Replies: 0
• Views: 1,826
04-18-2007, 04:20 PM
40. ### Factor reduction of dichotomous variables

I have a set of 22 dichotomous (yes/no) variables with a sample size of almost 1000 that I want to factor reduce. I do not think I can use factor...

• Replies: 0
• Views: 2,451
04-18-2007, 04:59 PM
41. ### Non-normal distribution?

According to central limit theorem, measurement noise distribution can be well described by normal distribution. But under what conditions does noise...

• Replies: 0
• Views: 2,240
04-18-2007, 09:28 PM
42. ### Is it significantly different from chance?

Can someone give me a second opinion on this, or suggest some alternative test I might want to use? I've run an experiment with 5 trials. Each...

• Replies: 0
• Views: 3,584
04-19-2007, 11:12 AM
43. ### Change from Baseline

Good Morning, Let's say I am looking at number of sneezes over a course of a month and I want to calculate the Percent Change from Baseline in...

• Replies: 1
• Views: 4,795
04-19-2007, 11:27 AM
44. ### hypothesis testing

A bottling company needs to produce bottles that will hold 12 ounces of liquid for a local brewery. Periodically, the company gets complaints that...

• Replies: 1
• Views: 5,790
04-19-2007, 11:29 AM
45. ### Ranking Performance

In statistics if 10 people take a test you get your mark along with your ranking relative to the rest of the class, I think this is done as...

• Replies: 1
• Views: 2,684
04-19-2007, 11:40 AM
46. ### Bonferroni Correction

Hey, im doing a 2 way within subjects ANOVA and want to do post hoc tests, but SPSS obviously doesnt do post hoc tests for within subjects...

• Replies: 0
• Views: 5,195
04-20-2007, 06:38 AM
47. ### Free Data Sites for Class

Am taking MVA class. I'm looking for a Free Data Set that has responses to a questionnaire on a likert scale, preferably 1-7, with at least 100...

• Replies: 0
• Views: 2,582
04-22-2007, 11:10 PM
48. ### Urgent help on simple problem!!

I don't know why, but I can't seem to get any suggestion on a solution to my simple problem when I search the web or look in my statistics books I...

• Replies: 2
• Views: 2,829
04-23-2007, 01:11 PM
49. ### Almost done with assignment but . . .

Need some help on the final steps. Multipart assignment and I am down to last three steps but am on last two. Parts are 7. Calculate...

• Replies: 1
• Views: 2,623
04-23-2007, 01:17 PM
50. ### Ancova

hei, i am comparing body-measyrments of two groups of fish that are fed different diets against each other. the problem is that the two diets...

• Replies: 2
• Views: 3,337
mia
04-24-2007, 05:23 AM
51. ### Missing Values

Hi everybody, I have a problem with analyzing data due to many missing values. Experiment: Subjects have to press a button in response to a...

• Replies: 0
• Views: 2,952
04-24-2007, 07:55 AM
52. ### Linear model for 6 factors

I am trying to construct a linear model for a design with the following A location, a = 4 levels, Random B forest, B = 2 levels, Fixed...

• Replies: 0
• Views: 1,959
04-24-2007, 10:48 AM
53. ### Relationship between Probability of failure and satndard deviation

Hi, I have run into the following problem. I am running a test on a sample size of N. The test only detects if the samples pass or fail. If X...

• Replies: 0
• Views: 3,309
04-24-2007, 07:01 PM
54. ### 3 variables, level of significance...help!

I'm having trouble with this problem. It's different from anything I've come across so far and I'm not sure how to begin. Here it is: John, Ken,...

• Replies: 1
• Views: 2,435
04-24-2007, 10:40 PM
55. ### Trouble with the concept

I think I've narrowed this down, but I'm not sure yet: You're hired to conduct a study to find out which of two brands of diet cola college...

• Replies: 1
• Views: 3,193
04-24-2007, 10:45 PM
56. ### Easy Question...need help

We need an estimate of the mean acreage of Canadian farms. We plan to measure acreage for a random sample of 100 farms. Results from an earlier study...

• Replies: 1
• Views: 5,072
04-24-2007, 11:01 PM
57. ### 3SLS method

Dear members: I am reading a report on an econometric analysis that has been carried out for fish industry. I am not familiar with 3SLS. I...

• Replies: 0
• Views: 2,671
04-25-2007, 09:54 AM
58. ### how to test for Gaussian distribution

Hey, I'm a bit rusty on my stats and i'm coming back to an article i wrote 18 months ago. I think i tested for Gaussian distribution, but now i...

• Replies: 0
• Views: 3,111
04-25-2007, 03:37 PM

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