1. Announcement:
05-10-2017
Views:
1,784
Page 14 of 294 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 64 114 ... Last
Threads 781 to 840 of 17583

# 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: 196,608
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: 66,642
09-30-2005, 09:44 AM
1. ### Deck of cards and probability (non replacement)

Hi can someone help me Im stuck. When selecting cards from a deck without replacement: What is the probability that the first card is a four and...

• Replies: 8
• Views: 9,763
11-11-2010, 09:40 PM
2. ### simple stat question...

Hi, I am taking signal readings and they are varying, so I take 5 replicate measurements, and have something like this: sample1.avg (of 5...

• Replies: 8
• Views: 3,043
08-25-2011, 07:11 PM
3. ### Similar to a Pearson Chi-Square Test

Hi All, I'm working with a 4x3 Contingency Table and would like to do a test similar to a Chi-Square Test. I figured it might be called a Weight...

• Replies: 8
• Views: 3,705
08-18-2010, 09:56 AM
4. ### "Combined" Means and Variances?

Hi everyone. This is my first stat assignment of the semester and I am already confused. I'm not sure what my prof is asking. I will reproduce...

• Replies: 8
• Views: 7,219
09-13-2010, 08:07 PM
5. ### Simple statistics help

I'm taking operations management and my stat professor never really taught us anything...so i'm kind of up a creek without a paddle. question...

• Replies: 8
• Views: 3,481
09-14-2010, 11:12 AM
6. ### Central tendency and percentile

Can any of the following be true with a data set consisting of 1,000 values that are all different? If so, can you please explain why:eek: The...

• Replies: 8
• Views: 7,350
09-24-2010, 08:04 AM
7. ### Statistic Theory Question

At the age of 8, Max obtained an observed score of 48 on a standard test of vocabulary. After a year of therapy directed at enhancing his vocabulary...

• Replies: 8
• Views: 3,390
10-20-2010, 02:06 AM
8. ### Help with calculating significance of the results

Hello, I am doing down-stream analysis of genomic data. I have 'X' number of occurrences in our 2000 gene sequences of interest. I have generated...

• Replies: 8
• Views: 3,288
10-22-2010, 10:32 AM
9. ### P value/T distribution chart question

Thank you for taking the time to read my query. I appreciate it. For my class, we have to find the p values by hand. We look them up in the z, t...

• Replies: 8
• Views: 16,755
11-02-2010, 05:35 PM
10. ### help.

ok, so i need help with this question, i have done it 4 times now and cannot get the correct answer... a recent study sugguests that declinging...

• Replies: 8
• Views: 2,845
11-05-2010, 01:16 PM
11. ### P Value Question

N=12-1 with a degree of freedom of 11 t = 6.01-6 divided by 0.18 divided by the square root of 12. = 0.192 P-Value = P(t<-0.192)+P(t>0.192) ...

• Replies: 8
• Views: 3,297
11-22-2010, 08:51 PM
12. ### what tests should I use?

I have completed most of my assignment, but SPSS is eating my brain and I keep mixing everything up. Can anyone help with what tests I should use for...

• Replies: 8
• Views: 4,032
12-03-2010, 01:08 AM
13. ### Need help ASAP 20 mins!

Sorry for the quick need of help, but can you guys help me solve this problem? I have tried for over 2 hours and still can't find the answer, and I...

• Replies: 8
• Views: 5,271
12-01-2010, 01:35 AM
14. ### Skewed!

Hi, I had a question, umm..in fact two :P lets say we have a skewed to right or left population and we dont know population sigma, also n is small...

• Replies: 8
• Views: 3,104
12-03-2010, 02:50 PM
15. ### log normal plot shows non-normal

Hi, I have two data sets both have 20 observations for mean high temperatures . I have to compare 1950-1969 to 1970 -1989, but the problem is log...

• Replies: 8
• Views: 5,630
12-12-2010, 01:44 PM
16. ### 2x14 Chi Square Homogeneity Test Tool Needed

Hello, I need to run a Chi-squre homogeneity test for a 2x14 contingency table. The most rxc matrix tool I can find is a 10x10 at: ...

• Replies: 8
• Views: 6,532
12-09-2010, 09:11 AM
17. ### I guess this is like a puzzle...

I'm not certain this qualifies as statistics, per sa, but it's at least in the same vein. I have need of writing a computer program that analyzes...

• Replies: 8
• Views: 3,655
12-29-2010, 09:13 AM
18. ### Which statiscal analysis to use?

I'm doing a soil quality comparisson between 3 different sites. I have the following data: 30 samples from each site for indicator number one ...

• Replies: 8
• Views: 2,175
01-01-2011, 06:19 PM
19. ### How to do this calculation? Balanced pairing of two groups

I have two groups of information. Consonants (15 values in total): sz* 17,40 % kcq* 10,63 % f* 9,30 % b* 9,10 % t* 7,43 % p* 6,22 %

• Replies: 8
• Views: 2,409
01-03-2011, 01:05 PM
20. ### [Solved] Problem with regards to Poisson! Need some help.

Provided information; No. of particles in sample / No. of samples 0 / 32 1 / 47 2 / 37 3 / 18 4 / 4 5 / 2

• Replies: 8
• Views: 6,195
01-09-2011, 08:55 PM
21. ### Problem Major Headache (Pharmacy Student)

I would be very grateful if someone could point me in the right direction on this one : % improvement in bone density over fixed period of...

• Replies: 8
• Views: 3,618
03-11-2011, 01:55 PM
22. ### Probability

Hi everyone, for some reason I can't find out how to solve this problem... The question is ... -- In a particular year, 40% of home sales were...

• Replies: 8
• Views: 3,528
03-18-2011, 12:01 PM
23. ### Can I use ANOVA for this?

Ok this may be a little difficult to explain so please bear with me... Trying to decide on which statistical test I need to analyse my data. I...

• Replies: 8
• Views: 3,524
03-24-2011, 10:58 PM
24. ### Question regarding finding midpoints, relative frequency and cumulative frequency

I was given a list of numbers as listed below: 91 472 279 249 530 376 188 341 266

• Replies: 8
• Views: 9,736
04-02-2011, 01:58 PM
25. ### Clueless Pharmacy student with a stats project to do

Hi - as you can see statistics is of no relevence to my degree but all the same I have a project to do due for next week. If anyone could help me...

• Replies: 8
• Views: 3,518
04-16-2011, 11:39 AM
26. ### Is this question as simple as it seems?

Fluorescent light tubes used by a firm have a target life of 1600 hours. However, accumulated data shows a mean time to failure of 1570 hours. What...

• Replies: 8
• Views: 2,041
04-28-2011, 01:06 AM
27. ### My stats just don't work!

data method is incorrect

• Replies: 8
• Views: 6,164
06-15-2011, 08:44 PM
28. ### Easy question about covariance / beta

Hi, I have a relatively easy question: Suppose that you have the mean and variance of two variables x y. for instance mean(x) =0,2 ; mean(y) =...

• Replies: 8
• Views: 5,389
05-24-2011, 05:07 PM
29. ### Correlation between dichotomous and ordinal variables

Hi everyone, I am very thankful for your feedback on my eventually simple question: I want to calculate the correlation between a dichotomous...

• Replies: 8
• Views: 16,858
06-24-2011, 06:41 AM
30. ### Nonparametric equivalent for (factorial) MANOVA?

I once had some experience in SPSS/statistical testing, but now I really need it, I cannot seem to find the appropriate tests. I hope anyone can...

• Replies: 8
• Views: 9,087
07-08-2011, 08:40 AM
31. ### Contrasts in R for two-way and three-way interactions

I am new to using R and have just performed some mixed effect models which have significant 2-way and 3-way interactions. My question is now that I...

• Replies: 8
• Views: 9,715
07-14-2011, 07:31 AM
32. ### How to test when series of data becomes not significant...

Hello, I am trying to figure out what test to use in order to solve a fairly basic concept. I am not sure if this is a cenvergence test or a...

• Replies: 8
• Views: 2,215
07-21-2011, 09:42 AM
33. ### Basic - Mean or median?

Hello all, Quite a basic question here, but just looking for other opinions. When deciding which measure of central tendency to use, I tend to...

• Replies: 8
• Views: 3,964
08-02-2011, 02:03 AM
34. ### Maximum Likelihood Estimation

Hi, I have a table in which I have data. some of these data are either missing or not reliable which indicated with "S". I would like to use MLE...

• Replies: 8
• Views: 2,768
08-15-2011, 02:20 PM
35. ### normal distribution need help

Suppose we take random sample of size n=25 from a normal distribution with mean 10 and standard deviation 5. If samples of size 25 are taken...

• Replies: 8
• Views: 2,977
09-03-2011, 10:23 AM
36. ### Continuous or Discrete: Likert-type Time

Hi! Sorry for asking a very basic question. I'm not good at stats and can't reach someone who knows. I searched the net with many different...

• Replies: 8
• Views: 6,134
10-19-2011, 01:02 PM
37. ### Different significance values from Pearson and Spearman tests

Hi I am asking for help because I am confused with the interpretaion of the results. The data is obviously non-linear as Pearson coeficient is...

• Replies: 8
• Views: 7,876
10-19-2011, 09:05 PM
38. ### Goodness of Fit.

Help guys.. I need to answer my " Problem of the Study" in my Research Paper. The question is "Are there significant difference between the...

• Replies: 8
• Views: 2,176
10-04-2011, 09:36 PM
39. ### matrix algebra in statistics

Let say that X ~ Beta(c,d) or X~N(mu,sigma^2) or anything really... does T(a)Xa also have a beta/Normal distribution??? Where a is just a vector....

• Replies: 8
• Views: 2,739
10-05-2011, 09:10 AM
40. ### problems proving the 4th moment for discrete, cont. cases

X is a random variable with moments, E, E, E, and so forth. Prove the following is true for i) X is discrete, ii) X is continuous E^4 = E(X^4) -...

• Replies: 8
• Views: 4,356
10-09-2011, 10:48 AM
41. ### Post-Hoc Analysis with a numerical factor

Hello, I have a problem that required your help. I have some data that I would like to analysis. It is an experiment with two factors. The first...

• Replies: 8
• Views: 2,615
10-26-2011, 04:09 AM
42. ### Do I assume the standard dev is zero?

I'm testing the hypothesis that my monthly expenditure is £1000. Null = £1000 H1 = >£1000 The stats app that I've downloaded onto my phone...

• Replies: 8
• Views: 3,287
10-28-2011, 06:17 AM
43. ### Calculation of x2-probability - formula

Hey guys. I'm currently working with Stata and a nominal data set. I've done a chi^2 test and found a P-value (0.023), but I would really like to...

• Replies: 8
• Views: 3,195
11-13-2011, 02:23 PM
44. ### Probability that sample mean is within the 1 unit of population mean?

Hello People, I am currently working on the following question: "A sample A is taken from the population. It is of size n1. Calculate the...

• Replies: 8
• Views: 14,877
11-13-2011, 05:42 PM
45. ### Assignment for a stats class: hypothesis testing and alike

Hey everyone ! I am having a few issues with my assignment. This is question 1, I will make a second thread for question 2. Here is Question 1:...

• Replies: 8
• Views: 6,737
11-23-2011, 11:24 AM
46. ### Lack of fit meaning

Hello! I am a researcher fellow in the chemical engineering area and recently applied experimental design to my experiments. However I am having...

• Replies: 8
• Views: 12,780
11-23-2011, 04:47 AM

Consider a sample size of 100 with a standard deviation of 10. a) What is the probability that the sample mean will be within 1 of the value of...

• Replies: 8
• Views: 2,939
BGM
11-30-2011, 01:26 PM
48. ### Symbols used in Simple Regression

I am a little confused about the terminology used in simple regression. The professor taught us that SSY = SSR + SSE. But on our test yesterday,...

• Replies: 8
• Views: 4,025
12-02-2011, 02:13 PM
49. ### Orthogonal Contrasts

What are orthogonal contrasts?

• Replies: 8
• Views: 3,166
12-06-2011, 11:54 PM
50. ### Nonparametric vs Parametric Correlations?

I ran a variety of tests and they all say my data is non-normal. I ran nonparametric tests (okay, just the Mann-Whitney) but now I wanted to look at...

• Replies: 8
• Views: 3,007
12-07-2011, 09:49 PM
51. ### [SOLVED] [HELP] i need help with them plz

19. The weights of cats are normally distributed with a known standard deviation of 2 lb. If we take a sample of 64 cats and get a sample mean...

• Replies: 8
• Views: 2,394
12-24-2011, 10:48 AM
52. ### best test for this non-normal distribution?

Hello! I've recently been working on a report for some research I conducted in september and I've run into a bit of a problem during the analysis...

• Replies: 8
• Views: 2,213
01-10-2012, 12:55 PM
53. ### Urgent help please! Which Statistical methd to use

Hi, I' trying to finish a report but haven't done stats in years :shakehead I have two data sets measuring microbial growth on food. Data set 1...

• Replies: 8
• Views: 2,493
01-25-2012, 04:36 PM
54. ### Help me! :(

I'm in the process of designing a questionnaire study for approx 200 breeders to determine how much knowledge is known about developmental stages....

• Replies: 8
• Views: 2,190
02-15-2012, 06:53 PM
55. ### multivariate stats quick question

I don't really understand the difference between multivariate methods and non-multivariate methods. My teacher was saying that some other methods are...

• Replies: 8
• Views: 3,254
02-15-2012, 08:49 PM
56. ### One Tailed test

For a positive one tailed test, if the obtained value falls to the left of the critical value, do you retain the null or is there an error?

• Replies: 8
• Views: 4,734
02-19-2012, 07:48 PM
57. ### Ordinal Data

I have the following hypothesis: Novice drivers perceive road environments as more difficult when there are more pedestrians. I have the...

• Replies: 8
• Views: 1,823
03-01-2012, 10:56 AM

Page 14 of 294 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 64 114 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.