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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread 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...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 197,111
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,929
    09-30-2005, 09:44 AM Go to last post
  1. Factor analysis

    Is anyone an expert on factor analysis?

    Started by Susanbwh‎, 02-08-2006 01:58 PM
    • Replies: 13
    • Views: 4,399
    02-10-2006, 09:17 AM Go to last post
  2. Fischer's

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

    Started by Susanbwh‎, 02-09-2006 08:56 AM
    • Replies: 1
    • Views: 2,756
    02-09-2006, 09:06 AM Go to last post
  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?

    Started by Susanbwh‎, 02-09-2006 08:55 AM
    • Replies: 1
    • Views: 2,325
    02-09-2006, 09:05 AM Go to last post
  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...

    Started by Susanbwh‎, 02-08-2006 03:37 PM
    • Replies: 2
    • Views: 3,058
    02-09-2006, 08:52 AM Go to last post
  5. T Statistic

    I have been asked to complete a t test to determine if my coefficient and related variables are reliable enough. The variables are related to...

    Started by Completely Confused‎, 02-08-2006 11:21 AM
    • Replies: 7
    • Views: 3,634
    02-08-2006, 03:06 PM Go to last post
  6. 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...

    Started by phippsc‎, 02-07-2006 05:22 PM
    • Replies: 1
    • Views: 2,178
    02-07-2006, 08:14 PM Go to last post
  7. 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...

    Started by Completely Confused‎, 02-07-2006 03:07 PM
    • Replies: 1
    • Views: 4,890
    02-07-2006, 03:22 PM Go to last post
  8. Question 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...

    Started by Ema‎, 02-07-2006 04:35 AM
    • Replies: 1
    • Views: 3,721
    02-07-2006, 08:32 AM Go to last post
  9. 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...

    Started by scifiguru‎, 02-05-2006 05:13 AM
    • Replies: 6
    • Views: 3,217
    02-07-2006, 07:59 AM Go to last post
  10. 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 ,...

    Started by beast‎, 02-04-2006 11:27 AM
    • Replies: 1
    • Views: 2,866
    02-04-2006, 08:53 PM Go to last post
  11. 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...

    Started by panz‎, 02-01-2006 11:59 AM
    • Replies: 1
    • Views: 2,857
    02-01-2006, 12:23 PM Go to last post
  12. 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...

    Started by Amjad‎, 01-31-2006 03:56 PM
    • Replies: 2
    • Views: 3,931
    02-01-2006, 10:49 AM Go to last post
  13. Question 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...

    Started by greenlizz‎, 01-31-2006 12:19 AM
    • Replies: 1
    • Views: 3,249
    01-31-2006, 07:46 AM Go to last post
  14. Question 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...

    Started by jfoust01‎, 01-30-2006 01:42 PM
    • Replies: 2
    • Views: 17,107
    01-30-2006, 07:11 PM Go to last post
  15. plz reply ASAP!!

    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...

    Started by sadaf‎, 01-30-2006 08:30 AM
    • Replies: 1
    • Views: 2,632
    01-30-2006, 09:29 AM Go to last post
  16. Question 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...

    Started by AlexM‎, 01-29-2006 09:34 AM
    • Replies: 3
    • Views: 6,452
    01-29-2006, 12:28 PM Go to last post
  17. 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...

    Started by Amjad‎, 01-25-2006 01:18 PM
    • Replies: 2
    • Views: 4,210
    01-25-2006, 05:41 PM Go to last post
  18. Question 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...

    Started by Amjad‎, 01-24-2006 10:02 PM
    • Replies: 2
    • Views: 3,126
    01-25-2006, 11:12 AM Go to last post
  19. 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...

    Started by Erida‎, 01-23-2006 06:29 PM
    • Replies: 2
    • Views: 2,710
    01-23-2006, 09:15 PM Go to last post
  20. Desperate for help with this big regression Qu.

    Hello there, I am really struggling with the following question. If you have an idea about how to do any of the parts, I'd be very appreciative of...

    Started by beast‎, 01-23-2006 04:42 PM
    • Replies: 1
    • Views: 1,930
    01-23-2006, 05:04 PM Go to last post
  21. 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...

    Started by summertigger‎, 01-23-2006 12:43 PM
    • Replies: 4
    • Views: 3,232
    01-23-2006, 01:11 PM Go to last post
  22. 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...

    Started by summertigger‎, 01-22-2006 11:14 PM
    • Replies: 2
    • Views: 2,629
    01-23-2006, 12:19 PM Go to last post
  23. 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....

    Started by summertigger‎, 01-22-2006 10:11 PM
    • Replies: 1
    • Views: 2,143
    01-23-2006, 06:05 AM Go to last post
  24. 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 ...

    Started by summertigger‎, 01-22-2006 09:50 PM
    • Replies: 3
    • Views: 2,449
    01-23-2006, 06:00 AM Go to last post
  25. 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...

    Started by summertigger‎, 01-22-2006 05:40 PM
    • Replies: 1
    • Views: 2,360
    01-22-2006, 08:53 PM Go to last post
  26. 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....

    Started by split-splat‎, 01-18-2006 07:48 PM
    • Replies: 2
    • Views: 3,761
    01-21-2006, 08:33 PM Go to last post
  27. 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...

    Started by SandyShockey‎, 01-21-2006 08:01 PM
    • Replies: 4
    • Views: 2,910
    01-21-2006, 08:26 PM Go to last post
  28. 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...

    Started by roby‎, 01-20-2006 03:16 PM
    • Replies: 1
    • Views: 10,023
    01-20-2006, 04:03 PM Go to last post
  29. 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...

    Started by roby‎, 01-20-2006 02:53 PM
    • Replies: 1
    • Views: 2,717
    01-20-2006, 04:00 PM Go to last post
  30. 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...

    Started by 12345678‎, 01-19-2006 08:02 PM
    • Replies: 3
    • Views: 2,682
    01-19-2006, 10:21 PM Go to last post
  31. Question 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 ...

    Started by Iconia‎, 01-19-2006 02:17 PM
    • Replies: 1
    • Views: 4,721
    01-19-2006, 08:31 PM Go to last post
  32. Please Help Again Data Analysis

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

    Started by bear‎, 01-18-2006 12:58 PM
    • Replies: 8
    • Views: 4,124
    01-19-2006, 07:54 PM Go to last post
  33. Please help DATA ANALYSIS

    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...

    Started by bear‎, 01-18-2006 12:48 PM
    • Replies: 4
    • Views: 3,335
    01-18-2006, 01:57 PM Go to last post
  34. 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...

    Started by Jerryberry‎, 01-17-2006 12:54 AM
    • Replies: 2
    • Views: 4,715
    01-17-2006, 10:05 AM Go to last post
  35. Advertising campaign

    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...

    Started by Jerryberry‎, 01-17-2006 12:45 AM
    • Replies: 1
    • Views: 4,860
    01-17-2006, 01:00 AM Go to last post
  36. 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...

    Started by Jerryberry‎, 01-16-2006 12:07 AM
    • Replies: 2
    • Views: 4,109
    01-17-2006, 12:39 AM Go to last post
  37. 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...

    Started by Jerryberry‎, 01-15-2006 11:26 PM
    • Replies: 1
    • Views: 17,046
    01-16-2006, 10:01 AM Go to last post
  38. 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...

    Started by Jerryberry‎, 01-15-2006 11:39 PM
    • Replies: 1
    • Views: 3,740
    01-16-2006, 10:00 AM Go to last post
  39. 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...

    Started by Jerryberry‎, 01-15-2006 11:32 PM
    • Replies: 1
    • Views: 3,293
    01-16-2006, 09:57 AM Go to last post
  40. 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...

    Started by English‎, 01-13-2006 05:21 PM
    • Replies: 1
    • Views: 2,877
    01-13-2006, 07:59 PM Go to last post
  41. 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...

    Started by AlexKom‎, 01-12-2006 11:11 PM
    • Replies: 4
    • Views: 8,561
    01-13-2006, 08:47 AM Go to last post
  42. Question 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...

    Started by missycl‎, 01-12-2006 07:01 PM
    • Replies: 2
    • Views: 2,878
    01-12-2006, 07:33 PM Go to last post
  43. Question 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...

    Started by volleytron‎, 01-12-2006 08:36 AM
    • Replies: 3
    • Views: 2,763
    01-12-2006, 09:21 AM Go to last post
  44. Thumbs up 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...

    Started by Rojo‎, 01-11-2006 11:09 PM
    • Replies: 1
    • Views: 2,737
    01-12-2006, 08:25 AM Go to last post
  45. 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...

    Started by turkeyman‎, 01-11-2006 01:46 PM
    • Replies: 1
    • Views: 2,966
    01-11-2006, 03:49 PM Go to last post
  46. 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?

    Started by muddy‎, 01-08-2006 08:00 AM
    • Replies: 4
    • Views: 3,374
    01-08-2006, 06:48 PM Go to last post
  47. simple returns / autogressive model

    Hello, I have a problem with solving this statistical matter. The file aexdaily(1) consists a couple of data, the closing prices (workdays) of...

    Started by e. cools‎, 01-06-2006 05:45 AM
    • Replies: 0
    • Views: 2,711
    01-06-2006, 05:45 AM Go to last post
  48. 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...

    Started by Jerryberry‎, 01-05-2006 01:13 AM
    • Replies: 2
    • Views: 2,403
    01-05-2006, 09:54 AM Go to last post
  49. 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...

    Started by Jerryberry‎, 01-03-2006 01:18 AM
    • Replies: 5
    • Views: 5,890
    01-04-2006, 03:44 PM Go to last post
  50. Could someone please check my answer.

    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...

    Started by Jerryberry‎, 01-04-2006 01:37 AM
    • Replies: 1
    • Views: 9,587
    01-04-2006, 07:53 AM Go to last post
  51. 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...

    Started by Jerryberry‎, 01-04-2006 01:55 AM
    • Replies: 1
    • Views: 6,001
    01-04-2006, 07:52 AM Go to last post
  52. 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...

    Started by Jerryberry‎, 12-29-2005 11:21 PM
    • Replies: 4
    • Views: 2,923
    01-03-2006, 07:10 AM Go to last post
  53. 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...

    Started by Jerryberry‎, 12-29-2005 11:09 PM
    • Replies: 4
    • Views: 6,378
    01-03-2006, 12:23 AM Go to last post
  54. Unhappy 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,...

    Started by yuppy‎, 12-21-2005 04:38 AM
    • Replies: 1
    • Views: 4,155
    12-21-2005, 08:05 AM Go to last post
  55. 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...

    Started by 1NAMILL‎, 12-19-2005 11:40 PM
    • Replies: 1
    • Views: 2,508
    12-20-2005, 12:56 PM Go to last post
  56. Question 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...

    Started by MCG‎, 12-16-2005 11:30 AM
    • Replies: 3
    • Views: 11,484
    12-18-2005, 12:10 PM Go to last post
  57. Question 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...

    Started by samiam‎, 12-14-2005 10:51 AM
    • Replies: 5
    • Views: 5,881
    12-16-2005, 06:01 AM Go to last post
  58. 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

    Started by vogz32‎, 12-13-2005 10:37 PM
    • Replies: 2
    • Views: 3,707
    12-14-2005, 08:34 PM Go to last post
  59. Question 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! ...

    Started by ShannonL‎, 12-14-2005 02:55 PM
    • Replies: 4
    • Views: 4,658
    12-14-2005, 05:39 PM Go to last post
  60. 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...

    Started by Adalis‎, 12-14-2005 12:31 PM
    • Replies: 4
    • Views: 4,204
    12-14-2005, 02:52 PM Go to last post

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