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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: 197,315
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: 67,061
09-30-2005, 09:44 AM
1. ### I need help on this question

There are __________ possible ways that eight pictures can be hung on a wall.:yup:

• Replies: 1
• Views: 1,934
06-29-2007, 02:19 AM
2. ### I need some help with this one.....please

:confused: Box A contains the numbers 1, 2, 3, and 4. Box B contains the numbers 5, 6, 7, and 8. A number is first drawn from Box A and then another...

• Replies: 1
• Views: 4,256
06-29-2007, 02:13 AM
3. ### More help.....

:( The staff at a small company includes: 4 secretaries, 20 technicians, 4 engineers, 2 executives, and 50 factory workers. If a person is selected...

• Replies: 1
• Views: 1,668
06-29-2007, 02:12 AM
4. ### So confused.........

First one........ In a second grade class containing 14 girls and 7 boys, 2 students are selected at random to give out the math papers. What is the...

• Replies: 0
• Views: 5,585
06-28-2007, 02:45 PM
5. ### Still need some help......

:( A business has seven locations to choose from and wishes to rank only the top three locations. How many different ways can this be done? and...

• Replies: 0
• Views: 1,963
06-28-2007, 02:43 PM
6. ### Variance and Covariance

My question could be very easy or not. Sorry about two quenstions my level of english an my ignorancy. I want to now why when we estimate the...

• Replies: 1
• Views: 2,028
06-28-2007, 02:37 PM
7. ### IQ scores

Assume that adults have normally distributed IQ scores with a mean of 100 and a standard dviation of 15. Find the probability that a randomly...

• Replies: 1
• Views: 4,019
06-28-2007, 12:01 PM
8. ### IntrArater Reliability

Can I calculate intrarater reliability using a single measure within a multiple subject system design? Can intrarater reliability be found without...

• Replies: 1
• Views: 4,086
06-27-2007, 07:16 PM
9. ### Quality Assurance in Materials Manufacturing

Hey Everyone, So i have been given this task to try and quantify the changes seen due a certain material manufacturing process. I.e. i have Sample...

• Replies: 1
• Views: 2,252
06-26-2007, 08:59 PM
10. ### Does this compound extend the model organism's lifespan?

Hello, I am testing an experimental drug on snails in a small pilot study. The compound has the desired effect in vivo that we are looking for. ...

• Replies: 3
• Views: 2,439
06-25-2007, 07:38 PM
11. ### Repeated Measures vs. Randomized Groups

Can someone please explain to me why tests of significance are more powerful if they can use correlated repeated measures rather than randomized...

• Replies: 2
• Views: 3,315
06-25-2007, 04:53 PM
12. ### 3-option poll and significance

Is it possible to test for significance in this situation? As part of my summer internship required for school, I had to poll employees at the...

• Replies: 2
• Views: 2,737
06-25-2007, 01:05 PM
13. ### Simple question, difficult problem

Hi, First I have to admit that my knowledge in statistics is very basic. I'm a surgeon (that explains the reason). I'm trying to conduct a...

• Replies: 3
• Views: 2,431
06-25-2007, 01:58 AM
14. ### Stat questions

A custom bicycle manufacturer has had to deal with an increased rate of returned bicycles in recent months. Customers are returning bikes because...

• Replies: 0
• Views: 2,479
06-24-2007, 11:01 PM
15. ### how do you combine standard errors into one

I would like to display some data in a bar graph. Each column on the x-axis is composed of two values to give a larger total. I have standard errors...

• Replies: 0
• Views: 5,107
06-24-2007, 02:17 PM
16. ### 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: 3,472
06-23-2007, 03:29 PM
17. ### 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: 2,122
06-22-2007, 08:30 PM
18. ### 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: 4,513
06-21-2007, 11:28 AM
19. ### 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: 5,835
06-20-2007, 05:43 AM
20. ### 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: 4,727
06-20-2007, 05:32 AM
21. ### 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: 4,050
06-19-2007, 08:38 PM
22. ### 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: 4,309
06-19-2007, 08:49 AM
23. ### 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: 3,848
06-19-2007, 12:13 AM
24. ### test-retest reliability & sample size

deleted msg, wrong forum

• Replies: 0
• Views: 5,756
gga
06-18-2007, 05:52 PM
25. ### 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: 3,320
06-18-2007, 04:52 PM
26. ### 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: 4,302
06-18-2007, 04:05 PM
27. ### 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: 4,205
06-18-2007, 12:48 PM
28. ### 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: 6,452
06-18-2007, 08:52 AM
29. ### 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: 3,977
06-18-2007, 01:32 AM
30. ### 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: 2,480
06-17-2007, 06:04 PM
31. ### 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: 2,472
06-17-2007, 10:46 AM
32. ### 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: 5,104
06-17-2007, 10:34 AM
33. ### 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: 3,238
06-14-2007, 10:51 AM
34. ### 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: 7,241
06-14-2007, 01:20 AM
35. ### 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: 2,476
06-13-2007, 10:04 AM
36. ### 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: 1,883
06-13-2007, 05:26 AM
37. ### 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: 1,950
06-13-2007, 05:14 AM
38. ### 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: 2,664
06-12-2007, 08:21 PM
39. ### 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: 3,444
06-12-2007, 08:20 PM
40. ### 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: 3,947
06-12-2007, 06:01 PM
41. ### 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: 1,913
06-12-2007, 09:52 AM
42. ### 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: 2,408
06-09-2007, 03:13 AM
43. ### 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: 2,844
06-09-2007, 01:28 AM
44. ### 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: 5,281
06-07-2007, 10:40 PM
45. ### 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: 3,977
06-07-2007, 09:56 PM
46. ### 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: 6,561
06-07-2007, 09:12 AM
47. ### 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: 6,097
06-07-2007, 03:15 AM
48. ### 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: 5,151
06-06-2007, 05:56 PM
49. ### 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: 2,394
rtd
06-06-2007, 11:50 AM
50. ### 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: 3,145
06-06-2007, 09:44 AM
51. ### Moved: SPSS -Multinomial Logistic Regression

• Replies: -
• Views: -
06-04-2007, 02:36 PM
52. ### 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: 3,878
06-04-2007, 01:23 PM
53. ### 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: 3,036
06-04-2007, 10:16 AM
54. ### 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: 4,098
06-03-2007, 11:29 PM
55. ### 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: 2,720
06-03-2007, 01:02 PM
56. ### 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: 5,005
06-03-2007, 07:25 AM
57. ### 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: 2,451
06-03-2007, 02:11 AM
58. ### 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: 3,018
06-02-2007, 08:45 PM
59. ### 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: 1,554
06-02-2007, 08:30 PM

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