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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: 68,389
    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: 200,063
    07-16-2014, 11:01 AM Go to last post
  1. Percentile rank

    Can someone help me with the following problem? Thanks in advance ! :) Jon Molnar will graduate from Carolina Forest High School this year. He...

    Started by kate‎, 08-22-2005 09:36 PM
    • Replies: 2
    • Views: 8,163
    08-23-2005, 11:16 PM Go to last post
  2. Unhappy psyc stats

    I cant seem to understand what these results are showing! The experiment was to test face recognition when the face is tilted a certain way ie yaw or...

    Started by sharna‎, 08-31-2005 12:32 AM
    • Replies: 2
    • Views: 4,054
    08-31-2005, 07:30 PM Go to last post
  3. Question Random sampling for quality determination

    I have 20 tonnes of chocolate in 800 x 25kg cartons. How much chocolate from how many cartons must I sample to give me x% percent confidence that the...

    Started by MarnixKolder‎, 09-05-2005 06:34 AM
    • Replies: 1
    • Views: 4,390
    09-05-2005, 10:13 PM Go to last post
  4. Need Help w/ correlation test assume regression inferences are met. Work answer out

    A grass seed company conducts a study to determine the relationship between the density of seeds planted (in pounds per 500 sq ft) and the quality of...

    Started by greatful4stathelp‎, 09-07-2005 01:09 PM
    • Replies: 1
    • Views: 7,496
    09-08-2005, 11:09 AM Go to last post
  5. Question Correlation between two variable

    If the correlation between to variable is -1.00, and the student got a score 1.3 standard deviation below the mean on the 1st variabe, what score...

    Started by johnsonme‎, 09-09-2005 10:58 AM
    • Replies: 1
    • Views: 4,766
    09-09-2005, 01:05 PM Go to last post
  6. Unhappy Non-probability sampling stuff

    Hi there, Sorry probably asking a very basic question but just want to make sure... Am I right in saying that if I have surveyed people using a...

    Started by amyj‎, 09-09-2005 02:11 PM
    • Replies: 3
    • Views: 7,539
    09-09-2005, 03:23 PM Go to last post
  7. mean aggression scores

    Hi everyone, I was searching the web a few minutes ago and I discovered this webiste so I registered immediately. I have an assignment and I...

    Started by SLiburd‎, 09-11-2005 08:08 PM
    • Replies: 4
    • Views: 4,760
    09-11-2005, 10:40 PM Go to last post
  8. Setting Oridinals for Data

    Can anyone advise me on the use of HIGH/MEDIUM/LOW/NON-USER ordinals against a numeric data set (sales marketshare percentages ranging from 0-78%)?...

    Started by MDS‎, 09-14-2005 01:49 PM
    • Replies: 1
    • Views: 3,641
    09-14-2005, 02:47 PM Go to last post
  9. Fault trees

    Hi again, Can anyone share there opinion on the following: "In the case that a fault tree is influenced by common mode failures, is the...

    Started by Gizmo‎, 09-14-2005 03:09 AM
    • Replies: 1
    • Views: 4,061
    09-14-2005, 02:54 PM Go to last post
  10. Help

    Hi all, I am in dire need of help as I have an assignment which is due next week which I am really struggling with and would appreciate any help I...

    Started by Gizmo‎, 09-14-2005 02:50 AM
    • Replies: 2
    • Views: 3,510
    09-14-2005, 06:21 PM Go to last post
  11. help--new to statistics

    i am an undergrad student and just started statistics and already i do not unerstand--please help! see below what i need help with: the following...

    Started by raerae‎, 09-14-2005 12:45 PM
    • Replies: 4
    • Views: 4,641
    09-18-2005, 11:28 AM Go to last post
  12. Question please stat problem help

    2 questions.... 1. Suppose that the distribution of annual salaries for sales associates at this store is bell-shaped. Use the empirical rule to...

    Started by ecohelp‎, 09-18-2005 09:50 AM
    • Replies: 1
    • Views: 6,481
    09-18-2005, 11:37 PM Go to last post
  13. Question Can you help?

    Can anyone help with survey sampling? I need help with my Sampling Methods class. I have three homework questions that I have no idea how to...

    Started by arhodes1‎, 09-18-2005 09:24 PM
    • Replies: 8
    • Views: 4,562
    09-21-2005, 08:13 AM Go to last post
  14. Question Hypothesis Testing

    I have this homework problem that I need assistance with. A package-filling device is set to fill jars of jelly with a mean weight of 16 ounces of...

    Started by pla0812‎, 09-20-2005 09:34 AM
    • Replies: 3
    • Views: 3,584
    09-22-2005, 01:16 PM Go to last post
  15. Variance of Method of Moments Estimator

    Attached is a portion of my stats textbook. Can someone explain how the approximation at the bottom was obtained?

    Started by macro90‎, 09-23-2005 02:33 AM
    • Replies: 1
    • Views: 7,320
    09-23-2005, 08:24 AM Go to last post
  16. standard deviation

    If you have a random sample of 100 in a population and it has some SD and then you do another sample, this time of 300, what happens to the SD, and...

    Started by marginovera‎, 09-08-2005 03:18 PM
    • Replies: 6
    • Views: 4,933
    09-25-2005, 03:18 PM Go to last post
  17. Unhappy Help with normal distribution

    Hi All! I'm new to this forum and found it after spending 2 hours doing statistics homework. I'm trying to find an example, online, of the normal...

    Started by FFEMT81‎, 09-26-2005 11:43 AM
    • Replies: 2
    • Views: 3,954
    09-26-2005, 12:00 PM Go to last post
  18. stats

    ive posted a clearer message ahead

    Started by puestadeluna‎, 09-26-2005 11:53 AM
    • Replies: 1
    • Views: 3,295
    09-26-2005, 12:48 PM Go to last post
  19. Statistics --- help

    can some one describe how standard error of the mean differs for a population and for sample?

    Started by puestadeluna‎, 09-26-2005 02:23 PM
    • Replies: 1
    • Views: 3,698
    09-26-2005, 04:46 PM Go to last post
  20. Please , please , please ,I will pray for you

    hi to all , please help in stas , iam so stuck withit. i have assignment , but only 1 questions i need your help: (briefly explain) Q1: one of the...

    Started by mousa‎, 09-28-2005 09:27 PM
    • Replies: 2
    • Views: 5,307
    09-29-2005, 06:43 AM Go to last post
  21. statistics

    How and why does a one-tailed compared to a two-tailed test one affect the ability to identify significant differences?

    Started by bitterchocolate‎, 10-04-2005 12:29 PM
    • Replies: 2
    • Views: 5,730
    10-04-2005, 10:05 PM Go to last post
  22. Confidence Interval

    what is the relationship between the confidence level and the size of the interval?

    Started by bitterchocolate‎, 10-04-2005 10:22 PM
    • Replies: 1
    • Views: 3,729
    10-04-2005, 10:31 PM Go to last post
  23. Unhappy Help Me!!!!

    I have a homework mini assignment and im finding statistics very hard! Can somebody please help me figure out what to use and why for the following...

    Started by chanel‎, 09-30-2005 02:33 AM
    • Replies: 6
    • Views: 4,169
    10-05-2005, 09:36 AM Go to last post
  24. Confused

    I have no problems figuring out the normal distribution and z score for problems within the range but my teacher threw out a question with one out of...

    Started by mnrobinson‎, 10-06-2005 03:55 PM
    • Replies: 2
    • Views: 4,485
    10-06-2005, 05:37 PM Go to last post
  25. Maximum Likelihood Estimate

    I need to find the ML-estimate of theta. The likelihood function I got is To get the ML-estimate, I believe I need to simplify, take logs,...

    Started by macro90‎, 10-07-2005 08:59 AM
    • Replies: 4
    • Views: 4,098
    10-08-2005, 06:08 AM Go to last post
  26. New to Statistics - PLEASE HELP ASAP!!!

    :confused: I recently began this much dreaded course. I am having a difficult time grasping the concepts. I have an exam on Monday September 26,...

    Started by Rugrats3‎, 09-22-2005 10:34 AM
    • Replies: 11
    • Views: 6,385
    10-08-2005, 06:15 AM Go to last post
  27. Distribution free confidence interval

    How would I work out a distribution free 95% confidence interval of the median if given a large sample? To get the 95% CI I use \mbox{estimate}...

    Started by macro90‎, 10-08-2005 08:02 AM
    • Replies: 1
    • Views: 4,678
    10-08-2005, 09:09 AM Go to last post
  28. Probability of a Mailing Machine

    I need some real serious help. This is the problem I need to finish. A technician services mailing machines at companies in the Phoenix area....

    Started by NikNice‎, 10-09-2005 04:45 PM
    • Replies: 4
    • Views: 10,532
    10-09-2005, 05:53 PM Go to last post
  29. Exclamation sample mean

    The population of incomes in a particular community is thought to be highly right-skewed with a mean equal to $36,789 and standard deviation equal to...

    Started by jessi‎, 10-09-2005 06:22 PM
    • Replies: 2
    • Views: 4,861
    10-09-2005, 06:38 PM Go to last post
  30. statistics

    hi, i was wondering if it was better to use log-transformed data or untransformed data when making comparisons between two groups. also should we...

    Started by bitterchocolate‎, 10-11-2005 05:31 PM
    • Replies: 2
    • Views: 3,140
    10-11-2005, 06:55 PM Go to last post
  31. Computing Power

    I know that power is one minus beta...but how do you calculate beta?

    Started by amanning‎, 10-12-2005 09:48 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,524
    10-12-2005, 11:25 PM Go to last post
  32. Z values

    hey i was wondering when calculating proportions of a normal distribution and they ask you what is the probability of selecting something between 60...

    Started by bitterchocolate‎, 10-16-2005 07:57 PM
    • Replies: 2
    • Views: 4,049
    10-16-2005, 08:44 PM Go to last post
  33. my assignment due tomorrw,please help me

    Dear Sir or Madam, I would appreaciate your efforts to help others,so please help me in my assignment which is due tomorrow : In a cohort study...

    Started by yoshaa‎, 10-17-2005 01:10 PM
    • Replies: 1
    • Views: 3,368
    10-17-2005, 01:51 PM Go to last post
  34. Question ANOVA's

    Is it possible for someone to tell me how to do them?

    Started by angeleyes‎, 10-17-2005 09:30 PM
    • Replies: 2
    • Views: 3,495
    10-17-2005, 09:48 PM Go to last post
  35. Unhappy least squares method

    Has anyone ever heard of using this?? It has to do with the regression equation... pllllllllease explain with lots of detail. statistics is not...

    Started by luvlebeauty‎, 10-19-2005 02:19 PM
    • Replies: 2
    • Views: 3,904
    10-20-2005, 03:02 AM Go to last post
  36. help

    Honestly I have no idea how to do these I dont even know where to start please help In the past, of all the students enrolled in “Basic Business...

    Started by statsdummy‎, 10-20-2005 02:44 PM
    • Replies: 1
    • Views: 4,351
    10-20-2005, 03:37 PM Go to last post
  37. nonparametric stats

    Hi, I'm a grad student reading up on nonparametric stats. I have a basic question. Are techniques such as local regression and smoothing splines...

    Started by seth‎, 10-24-2005 03:25 PM
    • Replies: 2
    • Views: 3,477
    10-24-2005, 06:40 PM Go to last post
  38. hypothesis - need help

    Where are the statical symbols to put in the problems?

    Started by lmills‎, 10-23-2005 07:25 PM
    • Replies: 3
    • Views: 3,781
    10-24-2005, 07:54 PM Go to last post
  39. regression

    hi i have a doubt over something.. what is the standard error of the slope for regression and the standard error of the intercept. and what does...

    Started by puestadeluna‎, 10-25-2005 08:46 PM
    • Replies: 1
    • Views: 3,370
    10-25-2005, 09:05 PM Go to last post
  40. HIGH LEVEL STATS:Can u help?

    Hi, I am strugglig with some questions- I hope that someone will be able to help??? 1. Describe the relationship of the mEan, Median, and MOde to a...

    Started by sfsf28‎, 10-28-2005 01:11 PM
    • Replies: 2
    • Views: 4,145
    10-28-2005, 02:04 PM Go to last post
  41. Help- Am Lost!

    if you can do this you are a star and better than me. have just finished 34 other questions and this one has stumped me totally! The set of scores...

    Started by statme‎, 10-28-2005 02:57 PM
    • Replies: 1
    • Views: 3,964
    10-28-2005, 03:05 PM Go to last post
  42. approximation

    Could someone tell me how iH was approximated from the equation at the top? Which approximation rule was used?

    Started by macro90‎, 10-30-2005 05:39 AM
    • Replies: 2
    • Views: 3,155
    10-30-2005, 09:29 AM Go to last post
  43. Exclamation Please Please Help!!

    I need help with my statistics coursework and it has to be handed in 2morrow! i need to do spearmans rank of coefficient correlation on some data but...

    Started by bilstonbabe‎, 10-30-2005 01:55 PM
    • Replies: 1
    • Views: 3,021
    10-30-2005, 02:55 PM Go to last post
  44. Question Please Help Stats Confidence Level

    This my first posting. The Bank wants to estimate the mean dollars that each card holder will spend each month. It would like to be within plus...

    Started by ajjones‎, 10-22-2005 08:03 PM
    • Replies: 3
    • Views: 4,482
    10-30-2005, 06:52 PM Go to last post
  45. Determine Sample Size

    I'm not sure what direction to go with this problem. I'm given 2 random samples: 1. 120 men, mean age 26.7, standard deviation 5.2yrs 2. 150...

    Started by ojvko‎, 10-31-2005 04:15 PM
    • Replies: 2
    • Views: 4,865
    10-31-2005, 08:39 PM Go to last post
  46. Talking it's me again, need some help, thanks

    :D Ok. I think I have it, but my answer does not quite match up. ??? A RECENT POLL OF 700 PPL. WHO WORK INDOORS FOUND THAT 278 OF THEM SMOKE....

    Started by hilarysears77‎, 11-01-2005 07:55 PM
    • Replies: 1
    • Views: 9,264
    11-01-2005, 09:56 PM Go to last post
  47. Question chi squared

    I need to find the best type of analysis to compare whether people who say they would use a product are influenced by a characteristic. I have data...

    Started by Shona‎, 11-01-2005 06:58 PM
    • Replies: 2
    • Views: 4,978
    11-02-2005, 04:25 AM Go to last post
  48. Parsimonious regression model

    Hi, I am trying to finish an assignment and I am stumped on one question. It is asking me to build a valid parsimonious regression model. What do...

    Started by Sarah‎, 11-02-2005 05:46 AM
    • Replies: 1
    • Views: 39,316
    11-02-2005, 09:09 AM Go to last post
  49. Check my stats? How do I make a ratio that accommodates variability?

    Hi, I'm a newbie which a problem:confused: I have two sets of data: A and B. Each is represented by a mean and a standard deviation. I want to...

    Started by Danny76‎, 11-02-2005 05:37 AM
    • Replies: 3
    • Views: 5,227
    11-02-2005, 11:51 AM Go to last post
  50. I Need Help

    All, I am struggling with Statistics in all areas. I'm great with numbers, however, I'm lost with this. Can someone help? Here are the following...

    Started by 1NAMILL‎, 11-01-2005 02:48 PM
    • Replies: 6
    • Views: 10,630
    11-03-2005, 12:41 PM Go to last post
  51. Red face seems all too easy

    :D okay, I have bought my 68 average in stats up to a 76, We are currently studying Confidence Interval stuff and hypothesis testing. The teacher...

    Started by hilarysears77‎, 11-03-2005 05:23 PM
    • Replies: 1
    • Views: 4,218
    11-03-2005, 09:42 PM Go to last post
  52. Exclamation What stats to use?

    Hi everyone, iam doing a project on fish catches and i was wondering if there was any stats i could use. iam looking at catches (both net and rod)...

    Started by Gary‎, 11-04-2005 11:05 AM
    • Replies: 2
    • Views: 3,314
    11-04-2005, 11:46 AM Go to last post
  53. Help

    My question is: Find the critical value Chi squared R corresponding to a sample size of 3 and a confidence level of 95 percent. I know that...

    Started by 1NAMILL‎, 11-04-2005 04:08 PM
    • Replies: 3
    • Views: 9,693
    11-04-2005, 05:25 PM Go to last post
  54. Continuous Probability Distribution

    I tried reading and understanding continuous probabs distrib but i couldnt relate it to integration well pls can u help me right from the basics...

    Started by pradnya101‎, 11-05-2005 01:25 PM
    • Replies: 1
    • Views: 3,862
    11-05-2005, 02:37 PM Go to last post
  55. Smile paired t-test assumptions

    I know this test is used for two groups and involves a normally distributed, continuous variable--and it involves the difference in means. Does the...

    Started by kalbright36‎, 11-08-2005 11:18 PM
    • Replies: 5
    • Views: 6,284
    11-09-2005, 12:04 AM Go to last post
  56. confidence intervals

    I have a question that is driving me up the wall. A sample of size 400 has a (sum)x = 30,430 and (sum)xsquared = 3,261,1000. construct a 95%...

    Started by wynd90‎, 11-09-2005 09:57 PM
    • Replies: 4
    • Views: 4,344
    11-09-2005, 10:33 PM Go to last post
  57. Exclamation help! null/alternative hypothesis?

    QUESTION: If we are interested in testing whether the mean of population 1 is smaller than the mean of population 2 how would you state the null...

    Started by ecohelp‎, 11-10-2005 09:12 PM
    • Replies: 1
    • Views: 6,302
    11-10-2005, 11:08 PM Go to last post
  58. Regression question

    I am just beginning to learn about regression and I have a couple of questions. What is the difference in the standardized regression coefficient...

    Started by Diane‎, 11-11-2005 09:13 AM
    • Replies: 2
    • Views: 4,852
    11-11-2005, 01:03 PM Go to last post
  59. election statistics question

    looking at the new jersey 2005 election... i want to see if counties with a higher percentage of "over 65" people correlate to either a higher dem...

    Started by benbakelaar‎, 11-11-2005 09:11 AM
    • Replies: 1
    • Views: 4,161
    11-11-2005, 01:14 PM Go to last post
  60. Post Continuous variables for correlations

    Hello, I hope someone can help me with this question. If my variable is categorical (1=Sometimes, 2=Frequently ...) can I use it for in a...

    Started by justmira‎, 11-12-2005 02:50 PM
    • Replies: 2
    • Views: 3,298
    11-12-2005, 05:37 PM Go to last post

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