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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,739
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,734
    07-16-2014, 11:01 AM Go to last post
  1. Distribution of Estimators

    What happens to sigma in when you have different distributions ? if Ri~G(u,sigma)....then what happens to sigma if (Summation Ri ) / n ? do you...

    Started by r007k‎, 12-06-2005 02:30 PM
    • Replies: 1
    • Views: 3,526
    12-06-2005, 04:41 PM Go to last post
  2. Smile Trend Analysis

    What are the degrees of freedom in trend analysis? And what goes in the denominator? Does it matter what type of trend analysis you are doing, or...

    Started by amanning‎, 12-06-2005 10:49 PM
    • Replies: 4
    • Views: 10,381
    12-06-2005, 11:17 PM Go to last post
  3. Normal Distribution -Acceptable Pins

    A company supplies pins in bulk to a customer. The company uses an automatic lathe to produce the pins. The machine are normally distributed with a...

    Started by msdahlet‎, 12-07-2005 12:26 AM
    • Replies: 1
    • Views: 5,259
    12-07-2005, 12:44 AM Go to last post
  4. Unhappy jeepers

    :wave: :shakehead okay I have some problems that i am going to try my best to let you see what work I did. Le me know if I am right or where I went...

    Started by hilarysears77‎, 12-07-2005 09:08 PM
    • Replies: 1
    • Views: 2,553
    12-07-2005, 09:52 PM Go to last post
  5. Normal Distribution

    I am stuck again on Question 7, it requires a look at question 2, therefore, I have included that portion with the answers. I have also submitted my...

    Started by msdahlet‎, 12-07-2005 08:59 PM
    • Replies: 3
    • Views: 3,105
    12-07-2005, 11:34 PM Go to last post
  6. a lil' more help

    :shakehead :wave: okay i am stuck on this one. a recent study in a city stated that the average of retired men was 63.5 years. A sample of 20...

    Started by hilarysears77‎, 12-08-2005 11:42 AM
    • Replies: 1
    • Views: 2,014
    12-08-2005, 11:53 AM Go to last post
  7. Hypothesis testing

    Is it possible to have the "=" in the alternative hypothesis? In anassignment I am asked to try to falsify a hypothesis (and surely it is not...

    Started by ninisiss‎, 12-09-2005 04:18 AM
    • Replies: 1
    • Views: 2,657
    12-09-2005, 07:53 AM Go to last post
  8. ANOVA plots

    Hi all, Last minute stats exam panic.... In a 'theory' question we could be asked to give example plots for ANOVAs where: There is/isn't an...

    Started by Psych‎, 12-09-2005 08:25 AM
    • Replies: 2
    • Views: 6,859
    12-09-2005, 08:45 AM Go to last post
  9. Statistics

    These are heights and weights for five randomly-selected adults. Units are centimeters and kilograms, respectively. height 183 172 190 167 193...

    Started by shelly0326‎, 12-09-2005 11:03 AM
    • Replies: 3
    • Views: 2,826
    12-09-2005, 11:40 AM Go to last post
  10. help

    I am having trouble with the folowing question: Use the Poisson Distribution to find the indicated probability. A computer salesman averages...

    Started by 1NAMILL‎, 12-09-2005 12:36 PM
    • Replies: 7
    • Views: 4,651
    12-09-2005, 04:03 PM Go to last post
  11. Three-Way ANOVA

    Hi all, I am so confused. I have gone through my book over and over to figure this out. Ok, I understand how to perform an ANOVA, T-test or Z...

    Started by herbemd‎, 12-09-2005 09:28 AM
    • Replies: 5
    • Views: 5,047
    12-09-2005, 04:04 PM Go to last post
  12. Smile Multiple Choice Question

    Hello! Here is the problem: A group of eight people work on the 5th floor of the building.They all decide they want to lose weight by...

    Started by AlexKom‎, 12-10-2005 08:09 PM
    • Replies: 4
    • Views: 13,459
    12-10-2005, 09:25 PM Go to last post
  13. Need help with Hypothesis test!!!

    Okay I can't seem to figure out this problem. Would really appreciate any help that can be given. A sample of 81 account balances of a credt...

    Started by Zonie987‎, 12-12-2005 03:17 AM
    • Replies: 3
    • Views: 5,156
    12-14-2005, 08:14 AM Go to last post
  14. Question Hypothesis Testing question

    Hi, I am new to this forum. I need desperate help. I am taking a QMB 3200 class and there is no book so I am lost. Here is my question: ...

    Started by Adalis‎, 12-13-2005 10:29 PM
    • Replies: 6
    • Views: 3,254
    12-14-2005, 12:50 PM Go to last post
  15. 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: 4,184
    12-14-2005, 02:52 PM Go to last post
  16. 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: 4,632
    12-14-2005, 05:39 PM Go to last post
  17. 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: 3,685
    12-14-2005, 08:34 PM Go to last post
  18. 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: 5,841
    12-16-2005, 06:01 AM Go to last post
  19. 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: 11,430
    12-18-2005, 12:10 PM Go to last post
  20. 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: 2,498
    12-20-2005, 12:56 PM Go to last post
  21. 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: 4,132
    12-21-2005, 08:05 AM Go to last post
  22. 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: 6,337
    01-03-2006, 12:23 AM Go to last post
  23. 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: 2,907
    01-03-2006, 07:10 AM Go to last post
  24. 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: 5,971
    01-04-2006, 07:52 AM Go to last post
  25. 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: 9,526
    01-04-2006, 07:53 AM Go to last post
  26. 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: 5,855
    01-04-2006, 03:44 PM Go to last post
  27. 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: 2,390
    01-05-2006, 09:54 AM Go to last post
  28. 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: 2,700
    01-06-2006, 05:45 AM Go to last post
  29. 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: 3,354
    01-08-2006, 06:48 PM Go to last post
  30. 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: 2,946
    01-11-2006, 03:49 PM Go to last post
  31. 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: 2,712
    01-12-2006, 08:25 AM Go to last post
  32. 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: 2,747
    01-12-2006, 09:21 AM Go to last post
  33. 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: 2,858
    01-12-2006, 07:33 PM Go to last post
  34. 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: 8,519
    01-13-2006, 08:47 AM Go to last post
  35. 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: 2,832
    01-13-2006, 07:59 PM Go to last post
  36. 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: 3,266
    01-16-2006, 09:57 AM Go to last post
  37. 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: 3,721
    01-16-2006, 10:00 AM Go to last post
  38. 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: 16,998
    01-16-2006, 10:01 AM Go to last post
  39. 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: 4,088
    01-17-2006, 12:39 AM Go to last post
  40. 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: 4,826
    01-17-2006, 01:00 AM Go to last post
  41. 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: 4,689
    01-17-2006, 10:05 AM Go to last post
  42. 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: 3,317
    01-18-2006, 01:57 PM Go to last post
  43. 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: 4,103
    01-19-2006, 07:54 PM Go to last post
  44. 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: 4,687
    01-19-2006, 08:31 PM Go to last post
  45. 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: 2,661
    01-19-2006, 10:21 PM Go to last post
  46. 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: 2,695
    01-20-2006, 04:00 PM Go to last post
  47. 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: 9,985
    01-20-2006, 04:03 PM Go to last post
  48. 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: 2,892
    01-21-2006, 08:26 PM Go to last post
  49. 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: 3,731
    01-21-2006, 08:33 PM Go to last post
  50. 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: 2,350
    01-22-2006, 08:53 PM Go to last post
  51. 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: 2,439
    01-23-2006, 06:00 AM Go to last post
  52. 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: 2,135
    01-23-2006, 06:05 AM Go to last post
  53. 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: 2,601
    01-23-2006, 12:19 PM Go to last post
  54. 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: 3,224
    01-23-2006, 01:11 PM Go to last post
  55. 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: 1,919
    01-23-2006, 05:04 PM Go to last post
  56. 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: 2,702
    01-23-2006, 09:15 PM Go to last post
  57. 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: 3,096
    01-25-2006, 11:12 AM Go to last post
  58. 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: 4,184
    01-25-2006, 05:41 PM Go to last post
  59. 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: 6,414
    01-29-2006, 12:28 PM Go to last post
  60. 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: 2,604
    01-30-2006, 09:29 AM Go to last post

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