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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: 66,761
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: 196,763
07-16-2014, 11:01 AM
1. ### Stuck on Acceptance Sampling

Hi, I'm studying stats independently so don't have a teacher to ask how to finish this question. Any help would be much appreciated. Before being...

• Replies: 0
• Views: 2,141
05-23-2007, 10:29 AM
2. ### This has to be simple if you know what you're doing?

I have two data sets with very different magnitudes. The first data set ranges from 2000 to 40000. The second data set ranges from 20 to 500. I...

• Replies: 1
• Views: 2,678
05-24-2007, 07:52 AM
3. ### Problem- fluctuating negative control

Hi, I have what sounds to me like a simple question that I just want to hear some opinions on. I'm trying to quantify changes in gene expression...

• Replies: 0
• Views: 1,690
05-24-2007, 09:13 AM
4. ### Question on Taguchi Method

Hi, I had a question on the dummy treatment technique in the Taguchi method. Suppose I am downgrading a 3 level column into a 2 level column by...

• Replies: 0
• Views: 1,979
05-24-2007, 10:06 AM
5. ### getting yihat

i have worked out the yi from a regression curve and i know that the yihat is the number predicted on the curve but how do i get it from using yi...

• Replies: 0
• Views: 2,108
05-25-2007, 10:46 AM

Greetings, I'm studying stats independently online from my university so don't have a teacher to ask how to finish these question. Any help would...

• Replies: 1
• Views: 1,979
05-26-2007, 06:45 AM
7. ### Calculating Quality Level for a product

Hi how can i calculate the overall quality level in ppm for a product in the month. this product produced in batches and these batches have...

• Replies: 2
• Views: 3,221
05-28-2007, 02:01 PM
8. ### Data analysis question

Suppose I had a set of mice that I induced an injury, and then looked for recovery based on a drug. I would split the group into treated and control...

• Replies: 0
• Views: 2,058
05-29-2007, 09:38 AM
9. ### 2 Way ANOVA or lots of T-tests!!! Just cant get my head round it!!!!

Hi everyone, I really cant get my head round which test i am supposed to use and every time i think i have it sorted in my head, i change my mind,...

• Replies: 1
• Views: 2,484
05-31-2007, 11:41 AM
10. ### statistically compare two rates

-The previous thread was difficult to read- I am currently working on a project and have calculated two injury rates. I am looking to get a p-value...

• Replies: 0
• Views: 3,943
05-31-2007, 01:18 PM
11. ### Which test to compare two populations

Hi All, New to this forum as I just need some human input re this question. I have googled and read, gone over all my stats notes form Uni but...

• Replies: 1
• Views: 2,510
06-01-2007, 11:15 AM
12. ### Collapsing rules for a 3 way ANOVA

Hi I'm trying to analzye some data, and I want to be sure that I am doing it correctly. Here is the situation. I have a 3 way interaction that is...

• Replies: 0
• Views: 4,654
06-01-2007, 03:31 PM
13. ### Breakdown point ???

what is the breakdown point of each of the following estimators. 1) the sample mean 2) The sample median 3) the least squares estimator of the...

• Replies: 0
• Views: 2,971
06-01-2007, 03:38 PM
14. ### Test for outliers

I have a set of concentrations of lead in soil from samples taken at random (spatially) across a 20m x 20m area. The data fit a normal distribution...

• Replies: 0
• Views: 5,311
FRA
06-02-2007, 07:50 AM

So I do a bit of online advertising for different websites. I always alternate between two slightly different ads to see which on gets the higher...

• Replies: 2
• Views: 2,129
06-02-2007, 11:58 AM
16. ### anova

Two students performed a penny toss experiment, repeatedly tossing 20 pennies and counting the heads that appeared. The results look odd and you...

• Replies: 0
• Views: 1,542
06-02-2007, 08:30 PM
17. ### Finding the p-values of the intercept and slope (regression)

From my simple made-up dataset. 1 12 5 17 7 23 8 9 9 14 I performed a simple regression analysis.

• Replies: 0
• Views: 2,979
06-02-2007, 08:45 PM
18. ### Need help with case in statistics

Hi there! I have just received a case analysis which will in part be basis for my coming exam in statistics. There are no restrictions concerning...

• Replies: 1
• Views: 2,431
06-03-2007, 02:11 AM
19. ### Filling in missing values

I subscribed to TalkStats less than an hour ago. This isn't a homework question, so I hope that's OK. I embarrassed to say I passed a college-level...

• Replies: 3
• Views: 4,958
06-03-2007, 07:25 AM
20. ### Multinomial Distribution Trouble

I have a homework problem as follows: "You have a deck of 52 cards and take out 35 cards, one-at-a-time with replacement. What is the probability of...

• Replies: 0
• Views: 2,688
06-03-2007, 01:02 PM
21. ### Likert Scale Analysis

I am writing a paper that will have 10 questions; respondents will answer using a 5-Point Likert Scale. Try as I might, I can't figure out what type...

• Replies: 1
• Views: 4,077
06-03-2007, 11:29 PM
22. ### inter-rater reliability question

I'm trying to help a colleague and haven't done this kind of analyses in ages. Can't remember what might be best to use for inter-rater reliability....

• Replies: 2
• Views: 3,009
06-04-2007, 10:16 AM
23. ### matched or unmatched

Hi everyone i'm in trouble well, in case-control study matched for age and sex only should i conduct matched or unmatched analysis? i need to...

• Replies: 0
• Views: 3,853
06-04-2007, 01:23 PM
24. ### Moved: SPSS -Multinomial Logistic Regression

• Replies: -
• Views: -
06-04-2007, 02:36 PM
25. ### time series data question

Hi All, I hope someone can help me with this. I am trying to analyse time-series data. I have three data collection points pre-intervention and...

• Replies: 0
• Views: 3,101
06-06-2007, 09:44 AM
26. ### Comparing a sample with a mean

I'm supposed to compare the increase in Oslo Stock Exchange with the increase in shares that were recommended at least 12 times. The increase in the...

• Replies: 1
• Views: 2,377
rtd
06-06-2007, 11:50 AM
27. ### Analyzing Likert Scores

Hi - from this thread you'll be able to ascertain my very low skill levels when it comes to statistics! Here is your chance to give me the answer and...

• Replies: 2
• Views: 5,115
06-06-2007, 05:56 PM
28. ### Finding standard deviation difference t-test?

Ok, I know the to find the mean difference, it's basically, the mean of C1 - C2. But how where did the 2.38 in the StdDev come from? It's surely not...

• Replies: 0
• Views: 6,058
06-07-2007, 03:15 AM
29. ### statistics Books

Hi everybody, I am new to this forum. I am a technical Analyst. I do analysis for Computer Systems using statistics. I am interested to learn...

• Replies: 10
• Views: 6,524
06-07-2007, 09:12 AM
30. ### Looking for contributors

Do you have a background or interest in math or statistics? Do you enjoy helping people, especially beginners, understand a complex concept? ...

• Replies: 0
• Views: 3,956
06-07-2007, 09:56 PM
31. ### Homewoek Question Help

I am trying to help someone with a statistics problem. I have taken the course but can't remember a lot. Please let me know if you have any help. ...

• Replies: 0
• Views: 5,232
06-07-2007, 10:40 PM
32. ### how to test mutual exlusion? (more than negative correlation)

I have a dataset with more than a negative correlation - there is mutual exclusion going on. A scatter plot of the two variables of interest gives...

• Replies: 0
• Views: 2,802
06-09-2007, 01:28 AM
33. ### Easy (?) question regarding Mean Reversion / Persistence

Hi all, I am doing a simple regression with accounting data. I regress current earnings (E_t) on the earnings of the previous periods, i.e....

• Replies: 3
• Views: 2,369
06-09-2007, 03:13 AM
34. ### Stats for linguists

Hi all. I've been working on my PhD for a year and a half now, and I'm still no further forward in understanding how statistics works. At the...

• Replies: 0
• Views: 1,835
06-12-2007, 09:52 AM
35. ### percentile rank

I need to know with a mean of 500 and a standard deviation of 100 how I would find the percentile ranking for the top 10% of a group.... AAAAAAAAGGG

• Replies: 3
• Views: 3,895
06-12-2007, 06:01 PM
36. ### Relatively simple questions...

I'm analyzing survey data from four different groups. Group 1, n=249 Group 2, n=216 Group 3, n=147 Group 4, n=33 I ran an ANOVA using a some...

• Replies: 0
• Views: 3,413
06-12-2007, 08:20 PM
37. ### Demand/Supply estimate model help, please!

hi, i'm attempting to create a demand estimate and supply model to measure HR data for class. The end reuslt to be able to predict exit/incoming...

• Replies: 0
• Views: 2,641
06-12-2007, 08:21 PM
38. ### Segment Allocation

Hi, I'm a new user to this forum so apologies if i've posted in the wrong area. My problem is to do with allocating segments to a database. A...

• Replies: 0
• Views: 1,924
06-13-2007, 05:14 AM
39. ### Significance tests

Hi, I'm working on basic data profiles for sample groups - volume, proportion percentage and index to universe - and am using z-scores to define...

• Replies: 0
• Views: 1,848
06-13-2007, 05:26 AM
40. ### Simple Question

If you wish to perform a simple linear regression on two variables but have no intuition as to which to use as the independent variable, which should...

• Replies: 5
• Views: 2,448
06-13-2007, 10:04 AM
41. ### Chi- square and ANOVA journal examples

HI There This is my first post, I have spent 2 days looking through my Ultrasound journals and online journals for examples of : ANOVA table...

• Replies: 1
• Views: 7,198
06-14-2007, 01:20 AM
42. ### Average Hours

We have the following data and we need to find average hours it takes to complete one item in CNC Item Quantity HOurs Applied Dept A 1 ...

• Replies: 3
• Views: 3,191
06-14-2007, 10:51 AM
43. ### spatial statistics: bivariate (cross) k-function vs k-function difference

Dear list, I want to assess if a series of cases (farms positive for a disease) are spatially clustered by comparing them to the general...

• Replies: 0
• Views: 5,047
06-17-2007, 10:34 AM
44. ### Help Required with Course Work

Hi, First post so here goes. I have some uni course work which I would appreciate a view on: We have been given a list of data and asked...

• Replies: 4
• Views: 2,449
06-17-2007, 10:46 AM
45. ### Spearmans Rank question

I am looking to test whether region (North / South) determines job satisfaction (graded 1 to 5). I have created the following table. Job...

• Replies: 1
• Views: 2,448
06-17-2007, 06:04 PM
46. ### highest correlation

How do I find the strongest correlation? Question:r=.32, r=.65, r=-.68, r=.57, r=-.49 I think the highest correlation is r=-.68. It shows a...

• Replies: 2
• Views: 3,946
06-18-2007, 01:32 AM
47. ### power analysis / sample sizes for factorial designs

Greetings, I'm interested in calculating the power (or sample sizes required for a power) for factorial designs. As an example, if I have a...

• Replies: 2
• Views: 6,389
06-18-2007, 08:52 AM
48. ### Converting scores to a metric

Scores for the AAT are reported with a mean of 80 and a standard deviation of 8. Martina received a raw score of 84 on the math portion of the AAT. ...

• Replies: 8
• Views: 4,180
06-18-2007, 12:48 PM
49. ### spearman's rho

Hello I am working with a non random sample of mainly ordinal data and am using Spearman's rho to look at the relationships between variables. I...

• Replies: 0
• Views: 4,266
06-18-2007, 04:05 PM
50. ### Likert Scale Survey - Stats

Question - I am using a likert scale survey to gather information for a correlational research question. What would be the appropriate data analysis...

• Replies: 1
• Views: 3,276
06-18-2007, 04:52 PM
51. ### test-retest reliability & sample size

deleted msg, wrong forum

• Replies: 0
• Views: 5,714
gga
06-18-2007, 05:52 PM
52. ### Prediction Interval Question

I'm working on a problem and need some help. Hope this is the right place. I ran a regression analysis on some data and came up with a model that...

• Replies: 1
• Views: 3,803
06-19-2007, 12:13 AM
53. ### What is better: higher number of participants or identical participants?

Dear all, I am a language teacher and currently conducting a research project into vocabulary acquisition. For this project, I had a setup of 1...

• Replies: 5
• Views: 4,266
06-19-2007, 08:49 AM
54. ### Normal Distribution Question

Need Help!!! Here is the problem: The National Center for Educational Statistics report that in the year ending 2003 some 400,000 students took...

• Replies: 14
• Views: 4,007
06-19-2007, 08:38 PM
55. ### Democrats and Republicans

Compute the test statistic used to test the null hypothesis that p1=p2. In a vote on the Clean Water bill, 41% of the 205 Democrats voted for the...

• Replies: 1
• Views: 4,677
06-20-2007, 05:32 AM
56. ### Dependent Data

The differences between two sets of dependent data are -3, -21, -12, -3, -27. Find Sd. Thank you to anyone in advance! :)

• Replies: 1
• Views: 5,797
06-20-2007, 05:43 AM
57. ### chow test

Hi everybody, I've got a problem with Chow Test about structural break... in fact on the base of my knowledge I think that this test can be used...

• Replies: 0
• Views: 4,479
06-21-2007, 11:28 AM
58. ### Curve Fitting / Regression

I've a system of equations of the form w(i)=a(i)*x1 + b(i)*x2 + c(i)*x3 + d(i)*x4 where a,b,c and d are observed/registered variables for each...

• Replies: 0
• Views: 2,096
06-22-2007, 08:30 PM
59. ### Simple Problem

Im looking to analyze a problem with data similar (but more complex) to the data below 111 111 111 111 111 111 111 101

• Replies: 3
• Views: 3,439
06-23-2007, 03:29 PM

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