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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: 197,111
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: 66,929
09-30-2005, 09:44 AM
1. ### Factor analysis

Is anyone an expert on factor analysis?

• Replies: 13
• Views: 4,399
02-10-2006, 09:17 AM
2. ### Fischer's

Is Fischer's exact.. a good way when we have small sample size, like around 50?

• Replies: 1
• Views: 2,756
02-09-2006, 09:06 AM
3. ### Anova

Can I use ANOVA when the variables were in a way correlated? I think we assume that the variables are independent in ANOVA. Am I right?

• Replies: 1
• Views: 2,325
02-09-2006, 09:05 AM
4. ### Logistic regression--Odds Ratios

Sometimes I have trouble with interpreting ORs. When it is less than 1, how do you interprete it. For example, if the OR is 0.45 between...

• Replies: 2
• Views: 3,058
02-09-2006, 08:52 AM
5. ### Help

I have to do a presentation for stats class tonight and don't understand how to explain my quantile plots, confidence intervals, correlation of...

• Replies: 1
• Views: 2,178
02-07-2006, 08:14 PM
6. ### T statistic

I was recently asked to calculate a T statistic for a correlation test and I'm not sure what the test identifies and how to read the results. I used...

• Replies: 1
• Views: 4,890
02-07-2006, 03:22 PM
7. ### related or independent observations - help needed

Hi, I am working in a project using data gathered for business purposes and I have a problem related to the observations in my samples. A...

• Replies: 1
• Views: 3,721
02-07-2006, 08:32 AM
8. ### Analysing an interstellar colony

Hi, This is really easy stuff for all the stats wizards here, but I'd really appreciate some help please. :yup: Suppose there's a colony of...

• Replies: 6
• Views: 3,217
02-07-2006, 07:59 AM
9. ### estimating parameters.

Hello there, I am having trouble with the following question. "An experiment in which 64 indivduals had their pulse rates recorded (x) and ,...

• Replies: 1
• Views: 2,866
heD
02-04-2006, 08:53 PM
10. ### Median, Conceptual

So the problem goes: The 14 people in group A have median age 28.4 years. The 20 people in group B have median age 36.2 years. What can you say...

• Replies: 1
• Views: 2,857
02-01-2006, 12:23 PM
11. ### Variability

Hi, I have a question for my home work about finding the 3 measure sof vairability for the variable that is given to us.but i am little confuse...

• Replies: 2
• Views: 3,931
02-01-2006, 10:49 AM
12. ### principal component analysis and scoring

I have a set of data and want to determine which cases group in terms of the component factors determined through principal component analysis. I'm...

• Replies: 1
• Views: 3,249
01-31-2006, 07:46 AM
13. ### Nominal, Ordinal, Ratio, Interval...? Need help.

I am having a really hard time with deciding whether things are nominal, ordinal, ratio, or interval. I was given four problems and asked to list...

• Replies: 2
• Views: 17,107
01-30-2006, 07:11 PM

hello everyone! i m a pharmacy student in final year doing a project in analytical chemistry. i want to noe wht is confidence interval of 95% or...

• Replies: 1
• Views: 2,632
01-30-2006, 09:29 AM
15. ### Stanine calculation

Hey all, I have been trying to solve this problem without success, thus I'm calling for Help :( Problem: There are 103 Italian provinces ranked...

• Replies: 3
• Views: 6,452
01-29-2006, 12:28 PM
16. ### Z score

I am having difficulty understanding the Z score. Its looks like that SD and Z score is doing the same function? Could you please explain with small...

• Replies: 2
• Views: 4,210
01-25-2006, 05:41 PM
17. ### New Student need help

Hi, I am a new student in statistics and any help will really appriciate. I am doing my assignment and one of the question was about level of...

• Replies: 2
• Views: 3,126
01-25-2006, 11:12 AM
18. ### give hyperstat to people and post hoc tests

Hi... I have a query regarding post hoc tests. When we carry out, say, a 2 way mixed anova and we come up with a significant interaction, how do...

• Replies: 2
• Views: 2,710
01-23-2006, 09:15 PM
19. ### Mean, standard error of mean

Bank officials claim that the average amount of money in savings accounts at all branches of the Commerce Bank is \$7500, with a standard deviation of...

• Replies: 4
• Views: 3,232
01-23-2006, 01:11 PM
20. ### speeding ND

A traffic survey revealed that the speeds of vehicles along a dangerous stretch of interstate follow a normal distribution with mean 50mph and...

• Replies: 2
• Views: 2,629
01-23-2006, 12:19 PM
21. ### Stats

The length of time for students to complete the Statistics final exam is normally distributed with mean 75 minutes and standard deviation 15 minutes....

• Replies: 1
• Views: 2,143
01-23-2006, 06:05 AM
22. ### Normal Distribution

In a normal distribution with u=200 and o=30, find the percentage of values that are between 200 and 225 z= (200-200)/30 =0/30 = 0 ...

• Replies: 3
• Views: 2,449
01-23-2006, 06:00 AM
23. ### Normal Distribution

In a normal distribution with u=200 and o=30 find the percentage of values that are between 180 and 195. If I could get an example of this that...

• Replies: 1
• Views: 2,360
01-22-2006, 08:53 PM
24. ### questions

I have 2 questions for a class that I am working on. The first one, I did and thought it was right but am now starting to doubt my answer! 1....

• Replies: 2
• Views: 3,761
01-21-2006, 08:33 PM
25. ### Help w/ gadgets, pls

I am in a basic online stats course. So far, I am doing ok with figuring out how to do the hw. My problem is that I have been out of school for...

• Replies: 4
• Views: 2,910
01-21-2006, 08:26 PM
26. ### true mean

Hi can you help me with another question please. i have been given the critical dimension of a random sample of 16 auto crankshafts measured in mm...

• Replies: 1
• Views: 10,023
01-20-2006, 04:03 PM
27. ### Probability Question

Hi can you help me with this problem please. a bank claimed 40% of its customers use internet banking. in random checks they found 170 of the 500...

• Replies: 1
• Views: 2,717
01-20-2006, 04:00 PM
28. ### equality of two samples

Hello, I have 10 values of two sample for each month for the 1987-1996 period. Is it possible to test if these two samples are equal? if so, which...

• Replies: 3
• Views: 2,682
01-19-2006, 10:21 PM
29. ### Help with inflection point in a curvilinear relationship

Hi all, I am reading an article that does a panel poission regression and finds out the following function: Y= 2,22 + 0,08X1 -0,0001 X1SQ ...

• Replies: 1
• Views: 4,721
01-19-2006, 08:31 PM

QUESTION- THE DRUG AZT WAS THE 1ST EFFECTIVE TREATMET FOR AID. AN IMPORTANT MEDICAL EXPERIMENT DEMONSTRATED THAT REGULAR DOSES OF AZT DELAY THE ONSET...

• Replies: 8
• Views: 4,124
01-19-2006, 07:54 PM

A STUDY EXAMINED HOW LONG AIRCRAFT AIR CONDITIONING UNITS OPERATED AFTER BEING REPARIED. HERE ARE THE OPERATING TIMES IN HOURS FOR ONE UNIT. 97 51...

• Replies: 4
• Views: 3,335
01-18-2006, 01:57 PM
32. ### Did I give the correct answers to this question

You are reading an article in your field that reports several statistical analyses. The article says that the P-value for a significance test is...

• Replies: 2
• Views: 4,715
01-17-2006, 10:05 AM

Did I do this correct? Before an intensive TV advertising campaign, the producers of Nike athletic shoes find that 29 of a random sample of 200...

• Replies: 1
• Views: 4,860
01-17-2006, 01:00 AM
34. ### Z and T statistics

Could some body please check my answers on this question? I really think I screwed this one up. Question: A friend who hears that you are taking...

• Replies: 2
• Views: 4,109
01-17-2006, 12:39 AM
35. ### The weights of newborn children

Could someone please check my answer? The weights of newborn children in the United States vary according to the normal distribution with mean 7.5...

• Replies: 1
• Views: 17,046
01-16-2006, 10:01 AM
36. ### A student organization

Is this answer correct? A student organization plans to ask 100 randomly selected students how much they spent on textbooks last semester. You...

• Replies: 1
• Views: 3,740
01-16-2006, 10:00 AM
37. ### An opinion poll

Is this the correct answer? An opinion poll asks 1500 randomly chosen United States residents their opinions about relations with the nations of...

• Replies: 1
• Views: 3,293
01-16-2006, 09:57 AM
38. ### Percentages if values

Will you please explain to me how I should set up and solve this problem? In a normal distribution with mu = 200 and standard deviation = 30, Find...

• Replies: 1
• Views: 2,877
01-13-2006, 07:59 PM
39. ### Multiple choice

Hello, I have some questions: A researcher wants to determine the mean income of adults in a particular state. She decides to tae a random sample...

• Replies: 4
• Views: 8,561
01-13-2006, 08:47 AM
40. ### Lost and need HELP!

I need assistance on the following problem (I'll state it and then state my thoughts on it so far): Scores made on a certain aptitude test by...

• Replies: 2
• Views: 2,878
01-12-2006, 07:33 PM
41. ### need help with transformation

Hey all I have questions about transforming variables. I'm sorry if this comes across as stupid. I have a set of variables (45 variables with...

• Replies: 3
• Views: 2,763
01-12-2006, 09:21 AM
42. ### Research and Profit

I need some help with this problem. My cooperation is interested in the relationship of funds expended in research and cooperation profit. The...

• Replies: 1
• Views: 2,737
01-12-2006, 08:25 AM
43. ### repeated measures quiz

Can someone please give me advice on analyzing repeated measures data. The thing I can't get past is the fact that the time between observations (lag...

• Replies: 1
• Views: 2,966
01-11-2006, 03:49 PM
44. ### standard error of mean

If I have a single data point and take that point as an estimate of the mean of the population, how would I estimate the standard error of the mean?

• Replies: 4
• Views: 3,374
01-08-2006, 06:48 PM
45. ### Is this right.

You have an srs of size n=15 from a normal distribution with standard deviation=1. You wish to test Ho: u=0 and Ha: u >0. You decide to reject Ho...

• Replies: 2
• Views: 2,403
01-05-2006, 09:54 AM
46. ### Need Help again

You have the NAEP quantitative scores for an SRS of 800 young men. You plan to test hypotheses about the population mean score, Ho: u=280 and Ha: u...

• Replies: 5
• Views: 5,890
01-04-2006, 03:44 PM

High school students who take the SAT mathematics exam a second time generally score higher than on their first try. The change in score has a...

• Replies: 1
• Views: 9,587
01-04-2006, 07:53 AM
48. ### Did I do this correctly?

We suspect that on the average students will score higher on their second attempt at the SAT mathematics exam than on their first attempt. Suppose...

• Replies: 1
• Views: 6,001
01-04-2006, 07:52 AM
49. ### School Girls

Could someone help me get started on this problem? How large a sample of school girls having a standard deviation of 25 points in their IQ scores...

• Replies: 4
• Views: 2,923
01-03-2006, 07:10 AM
50. ### The Distribution of Blood cholesterol level

Im really stuck on this problem could someone please help? The distribution of blood cholesterol level in the population of young men aged 20 to...

• Replies: 4
• Views: 6,378
01-03-2006, 12:23 AM
51. ### Natural Log

Hi! I am doing Biomedical studies in proteomics. As I am comparing groups by spot intensity using a computer software ,which is pretty sensitive,...

• Replies: 1
• Views: 4,155
12-21-2005, 08:05 AM
52. ### Thanks

I just wanted to say thank you to all of you who helped me with Statistics. I received an "F" on my midterm. However, by the time finals came...

• Replies: 1
• Views: 2,508
12-20-2005, 12:56 PM
53. ### Transformation then Standardization...?

Hi, I was wondering if anyone could answer what is probably quite an obvious question... I've got a dataset with 9 variables, of which I am...

• Replies: 3
• Views: 11,484
12-18-2005, 12:10 PM
54. ### online/clothing store purchases

I have this project for my stats class and I am about clueless, here is the question. A. cash back when the consumer makes an online purchase; and...

• Replies: 5
• Views: 5,881
12-16-2005, 06:01 AM
55. ### post test question

Hello all! can anyone tell me what are the benefits of conducting a post-test only assessment? ( no pre testing) thanks -vogz32

• Replies: 2
• Views: 3,707
12-14-2005, 08:34 PM
56. ### Determining level of confidence when provided with intervals

Hello to the forum... Just waiting for the results of my mid-term and would like to thank some members of this forum for their helpful direction! ...

• Replies: 4
• Views: 4,658
12-14-2005, 05:39 PM
57. ### Hypothesis testing

Here I am again....Thank you so much for helping me out yesterday. I am lost when it comes to Hypothesis testing....What do you think about this...

• Replies: 4
• Views: 4,204
12-14-2005, 02:52 PM

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