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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: 196,675
    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: 66,697
    09-30-2005, 09:44 AM Go to last post
  1. Confidence Interval for a Company's Rate

    I know that a 95% CI is one interval in a set of intervals where 95% of the intervals contain the population parameter. If the population paramter...

    Started by yu78zer1‎, 02-26-2010 12:19 PM
    • Replies: 2
    • Views: 2,121
    03-08-2010, 03:30 AM Go to last post
  2. confidence interval for a population proportion

    Hi All, My question is this: I'm trying to get confidence intervals around the means of the proportion of survey respondents that chose a...

    Started by jeffweiner41‎, 10-12-2013 10:01 AM
    • Replies: 2
    • Views: 1,784
    10-12-2013, 03:33 PM Go to last post
  3. Confidence Interval for a Proportion of a Population

    I was hoping someone could help me out with a problem based on an audit performed where I work. To provide some context, we are required to audit...

    Started by tgriffi2‎, 02-25-2013 03:52 PM
    • Replies: 0
    • Views: 952
    02-25-2013, 03:52 PM Go to last post
  4. Confidence interval for a simple survey result

    I recently surveyed 200 organisations to establish a number of key facts about them including the number of staff. 160 of them responded with the...

    Started by John Best‎, 10-27-2014 10:07 AM
    • Replies: 0
    • Views: 1,054
    10-27-2014, 10:07 AM Go to last post
  5. Confidence Interval for binary data

    If I want to calculate the 99% confidence interval for binary data. For example lets say I asked 500 people if they had ever done a bungee jump? ...

    Started by calypso‎, 02-01-2015 02:48 PM
    • Replies: 0
    • Views: 2,245
    02-01-2015, 02:48 PM Go to last post
  6. Confidence interval for Cohen's H

    hi everyone, I would like to create a Forest plot for a number of studies that looked at proportions. I calculated effect sizes using Cohen's H, but...

    Started by judithv‎, 07-08-2016 09:36 AM
    cohen's h, confidence interval, effect size
    • Replies: 0
    • Views: 945
    07-08-2016, 09:36 AM Go to last post
  7. Confidence Interval for Correlation

    Suppose I take two entities A and B. For these two, I have measured a particular characteristic for each of years 2006, 2007, 2008, 2009, and...

    Started by jcoull‎, 11-23-2010 06:10 PM
    • Replies: 2
    • Views: 3,495
    11-25-2010, 09:48 AM Go to last post
  8. confidence interval for covariance estimation

    Is it possible to calculate the confidence interval for the sample covariance estimation of two random variables? The two random variables can be...

    Started by brakepad‎, 05-31-2010 08:29 PM
    • Replies: 4
    • Views: 8,869
    06-01-2010, 01:56 PM Go to last post
  9. Confidence interval for difference between means- equal and unequal variances

    I was working on a problem where the instructor said to use the same values to determine confidence intervals for equal and unequal variances...

    Started by free_radicals‎, 06-17-2012 02:50 PM
    • Replies: 0
    • Views: 2,210
    06-17-2012, 02:50 PM Go to last post
  10. confidence interval for g(r), radial distribution function/ pair correlation function

    I am determining g(r) (aka a pair correlation function for two independent groups, where r is the radius between objects in the groups) for real...

    Started by mbstone‎, 07-12-2012 11:41 PM
    • Replies: 0
    • Views: 1,803
    07-12-2012, 11:41 PM Go to last post
  11. Confidence interval for Kendall's Tau-C

    Hi, I am conducting a Kendall's Tau-C correlation test (in SPSS), and I was wondering if there is any software or instructions on how to create a...

    Started by oxnard_montalvo‎, 09-14-2014 07:47 PM
    • Replies: 2
    • Views: 5,308
    09-15-2014, 07:17 PM Go to last post
  12. confidence interval for mean

    Hello all, I have a basic question. I want to calculate a confidence interval for the population mean. I know that the population is normal, and I...

    Started by Yankel‎, 12-31-2013 03:26 PM
    • Replies: 1
    • Views: 917
    12-31-2013, 03:46 PM Go to last post
  13. Confidence Interval for mean

    Hello in a statistical problem, the population standard deviation was given to be 3 and the sample size is 49. in the problem i was asked to use 99%...

    Started by osamastat‎, 06-29-2016 09:26 PM
    • Replies: 1
    • Views: 1,220
    06-29-2016, 09:31 PM Go to last post
  14. confidence interval for mean difference

    hello I need to calculate an CI for a mean difference. In the attached picture you can see the sample size, sample mean and sample SD from both...

    Started by Yankel‎, 02-23-2013 05:16 AM
    • Replies: 5
    • Views: 1,606
    02-23-2013, 01:34 PM Go to last post
  15. confidence interval for mean difference vs. hypothesis testing

    Hello, I am trying to solve a simple question in hypothesis testing and confidence interval, and something doesn't seem right. I have an...

    Started by Yankel‎, 06-05-2013 12:08 PM
    • Replies: 6
    • Views: 2,185
    06-06-2013, 09:32 AM Go to last post
  16. Confidence interval for median

    Hi I have a question about Wilcoxon-Moses confidence interval for median technique. The problem is with ties in my sample. It means I have counts...

    Started by kobylkinks‎, 04-18-2010 08:48 AM
    • Replies: 0
    • Views: 3,384
    04-18-2010, 08:48 AM Go to last post
  17. Confidence interval for median

    The question is: A traffic warden notes the time cars have been illegally parked after their metered time has expired. For 16 offending cars...

    Started by winds‎, 09-10-2010 07:00 PM
    • Replies: 9
    • Views: 28,525
    10-12-2010, 09:58 AM Go to last post
  18. Confidence interval for point estimate

    Lets say I have weights of 30 random children age 10 in a village. We can assume that these weights follow a normal distibution and can estimate the...

    Started by emily.stats‎, 06-25-2014 04:20 AM
    • Replies: 2
    • Views: 1,507
    06-30-2014, 12:11 PM Go to last post
  19. Confidence interval for pooled variance of multiple populations?

    Given: -10 data sets from different populations -20 measurements per data set -Each data set has a statistically different mean -The variance...

    Started by Clk‎, 01-22-2015 09:46 PM
    • Replies: 1
    • Views: 1,621
    01-23-2015, 06:21 AM Go to last post
  20. Arrow Confidence Interval for Population Mean

    I am working on a statistics problem and want to make sure I am on the right track. Here is the problem: The following sample of 16 measurements...

    Started by 3sacharm‎, 11-13-2010 10:07 AM
    • Replies: 6
    • Views: 7,983
    11-13-2010, 11:51 AM Go to last post
  21. Confidence Interval for Sample and T-Test

    For the sake of illustration, I am using a caliper mounted in stand A and measuring a part 20 times. This gives me a mean of 2mm and a 99% CI of...

    Started by Eppen‎, 11-19-2014 05:16 PM
    • Replies: 7
    • Views: 1,823
    11-24-2014, 02:57 PM Go to last post
  22. Confidence Interval for the Difference Between Two Means

    Hello, I test the hypothesis of the difference between two normally distributed population means with unknown population variances. The test is...

    Started by zarasandreas‎, 05-18-2011 04:24 PM
    • Replies: 1
    • Views: 4,210
    05-18-2011, 09:15 PM Go to last post
  23. Confidence Interval for the Median

    Hi All. I came across an article dealing with the Confidence Interval for the Median. Just for curiosity, I played with comparing the Confidence...

    Started by gianmarco‎, 05-08-2010 11:24 AM
    • Replies: 3
    • Views: 7,543
    06-17-2010, 11:27 AM Go to last post
  24. Confidence interval for the standard deviation

    Hi, I'm using the typical formula SQRT(((N-1)*s^2)/(CHISQ.INV((1-Confidence)/2, N-1))). By mistake I entered a very low confidence and I noticed...

    Started by mgubellini‎, 04-04-2017 11:30 AM
    • Replies: 1
    • Views: 939
    04-04-2017, 12:28 PM Go to last post
  25. confidence interval for total weight.

    Hi, Im struggling a bit with an example and I hope someone can guide me a little, Im working on the following example: I buy 200 gold coins,...

    Started by tweek‎, 10-09-2009 09:20 AM
    • Replies: 2
    • Views: 4,808
    10-11-2009, 08:54 PM Go to last post
  26. Confidence interval for unknown probability

    Suppose I have a black box with one button and one light. There is a fixed, but unknown, probability, P, that the light will come one whenever the...

    Started by Jennifer Murphy‎, 03-02-2016 06:12 PM
    • Replies: 6
    • Views: 1,132
    03-03-2016, 04:17 PM Go to last post
  27. confidence interval for variance

    Samples X1..Xn ~N(u, sigma_squared) and Y1..Ym ~N(u, 4sigma_squared), where population mean is known. Can anyone give me suggestions to calculate...

    Started by PeterVincent‎, 02-04-2008 12:37 PM
    • Replies: 0
    • Views: 2,235
    02-04-2008, 12:37 PM Go to last post
  28. Confidence interval from st. error when the mean must be positive

    Hello all, (Statistical newbie here - learning some basic concepts) Some background (you can probably skip to the 'important bit', but just in...

    Started by aferraro‎, 10-23-2012 10:21 AM
    • Replies: 6
    • Views: 1,723
    10-29-2012, 04:59 PM Go to last post
  29. Confidence Interval Gamma Dist

    Does anyone knows the equation for the Confidence Interval of a Gamma Distribution?

    Started by GGKING99‎, 02-14-2009 03:05 PM
    • Replies: 2
    • Views: 6,623
    02-16-2009, 01:20 PM Go to last post
  30. Smile Confidence Interval Help

    A usrvey of 49 randomly selected banks in New York revealed that these banks required average down payments of 35% of the purchase price of the home...

    Started by GeorgeBurns‎, 04-25-2006 07:54 AM
    • Replies: 2
    • Views: 2,611
    04-25-2006, 08:52 AM Go to last post
  31. Confidence Interval Help

    I am really stumped on this one: In a sample of 400 seeds, 240 germinated. Estimate the true germination rate with a 90% and 99% confidence...

    Started by sxg23‎, 07-12-2006 08:28 PM
    • Replies: 1
    • Views: 2,625
    07-13-2006, 04:03 PM Go to last post
  32. Confidence Interval Help

    I don't get it Population: Women - 800 Men - 1,000 Avg retirement Age: Women - 62.7 Men - 62.2 Standard Deviaition

    Started by LMoore‎, 11-18-2006 07:20 AM
    • Replies: 0
    • Views: 5,451
    11-18-2006, 07:20 AM Go to last post
  33. Confidence Interval Help

    Hello :) I have a question in my homework that states: "Lorraine computed a confidence interval for μ based on a sample size of 41. Since she...

    Started by Gina77‎, 04-16-2014 10:46 AM
    • Replies: 3
    • Views: 8,863
    04-16-2014, 03:11 PM Go to last post
  34. Confidence Interval help

    I am an engineering student working on some research and I am having some trouble constructing a confidence interval. I have various mechanical...

    Started by djb0724‎, 07-23-2014 01:34 PM
    • Replies: 0
    • Views: 945
    07-23-2014, 01:34 PM Go to last post
  35. Confidence interval help needed

    Hey guys, Its been a while since I did a CI so I am a bit rusty. I had 19 steel pins which all had an actual diameter of .375 in, so mean is...

    Started by bigbob‎, 09-16-2014 08:56 PM
    • Replies: 4
    • Views: 2,080
    09-17-2014, 06:58 AM Go to last post
  36. Smile Confidence interval help please!!!

    Would you please help me with this problem? Study conducted for 26 weeks. df 26-3-1 = 24 tcrit= 2.0639 Construct a 95% confidence...

    Started by sweetheart‎, 08-06-2010 08:13 PM
    • Replies: 3
    • Views: 8,368
    08-06-2010, 11:18 PM Go to last post
  37. Confidence Interval help.

    I have a few of these types of hw problems and can't remember the calculator function to be used. here is an example: The average size of a farm...

    Started by johnnybball‎, 04-06-2008 06:27 PM
    • Replies: 2
    • Views: 3,035
    04-07-2008, 09:01 AM Go to last post
  38. Confidence Interval homework help

    This is the only part of our homework I am not understanding... A.)If the 95% confidence interval for the population mean is (6,20), what is the...

    Started by jford1‎, 05-01-2015 04:50 PM
    confidence intervals
    • Replies: 4
    • Views: 1,531
    05-04-2015, 04:47 PM Go to last post
  39. Talking confidence interval interpretation -please help

    how do i interpret a 95% confidence interval which is presented in percentages with no standard deviations. (this is for a medical essay) two...

    Started by soph‎, 03-20-2014 08:58 AM
    • Replies: 14
    • Views: 1,993
    03-21-2014, 03:18 AM Go to last post
  40. Confidence interval of a mean difference

    Hi all, can someone refresh me on the process to do the following. Based on data that was published in a thesis: A within subjects...

    Started by dreamweaver888‎, 01-23-2016 02:27 AM
    • Replies: 2
    • Views: 1,102
    01-23-2016, 02:38 PM Go to last post
  41. Confidence Interval of a Population

    I am supposed to be finding the confidence interval for P(X=1) = EX = unemployment rate. I have X = 1 if unemployed, 0 if employed. Y = 1 if no...

    Started by wtrmlncrawl191‎, 10-10-2012 08:37 PM
    • Replies: 0
    • Views: 1,258
    10-10-2012, 08:37 PM Go to last post
  42. Confidence interval of density distribution

    Hi, I am a university student and I have a trouble with the following example. This is not what I am actually confronting, but I think it will make...

    Started by junishigohoka‎, 01-12-2017 06:09 AM
    confidence, confidence bands, density
    • Replies: 3
    • Views: 2,606
    01-13-2017, 01:46 AM Go to last post
  43. Confidence interval of log-linear regression with offset

    Daer all, I have a set of data, as shown below. Using Excel, I can plot the data set using the first column as X and the second column as Y. Both...

    Started by zerohead‎, 09-05-2012 04:56 AM
    • Replies: 0
    • Views: 2,341
    09-05-2012, 04:56 AM Go to last post
  44. Post Confidence interval of mean of queue length (M/M/1)

    Goodday, For a simulation course I had to simulate a single server queue with Poisson processes for arrival and departure (M/M/1). Now, this...

    Started by Knaapje‎, 09-05-2014 03:46 PM
    confidence, interval, m/m/1, sample, weighted
    • Replies: 3
    • Views: 2,388
    09-06-2014, 09:09 AM Go to last post
  45. Confidence Interval of Multiple Regression

    Hi Stupid question but I'm trying to work out a confidence interval estimate for the mean response. The formula I have in front of me is the...

    Started by qwe789123‎, 10-18-2010 07:35 AM
    • Replies: 4
    • Views: 18,909
    08-11-2012, 12:44 PM Go to last post
  46. Question Confidence Interval Of Regression Line

    I'll be honest with all of you, this is my first time here and I've taken Stats online which was a bad idea because my teacher got really busy and...

    Started by Nivra7‎, 06-09-2012 01:16 AM
    • Replies: 2
    • Views: 2,019
    06-09-2012, 02:07 PM Go to last post
  47. Confidence interval of the estimated p-value

    When I calculate the p-value of a test (say, a two-sample pooled t-test), that p-value is a statistic, and the value is a point estimate of that...

    Started by thecyclist‎, 12-08-2010 12:45 PM
    • Replies: 4
    • Views: 3,718
    12-08-2010, 03:18 PM Go to last post
  48. confidence interval of the mean difference

    hello every one, what if the confidence interval of the mean difference contain zero, but P is less than .05. can i still interpretate the result...

    Started by nurul‎, 10-14-2010 12:01 AM
    • Replies: 0
    • Views: 2,131
    10-14-2010, 12:01 AM Go to last post
  49. Confidence Interval on Estimated Data

    Problem How do I account for the error in my initial estimate on this problem? Background I need to know when a case is two standard deviations...

    Started by minchazo‎, 04-17-2009 09:30 AM
    • Replies: 0
    • Views: 2,318
    04-17-2009, 09:30 AM Go to last post
  50. Confidence Interval One-tailed Test

    Hi, I'm working on a problem for work where a client of ours wants to analyze the use of mobile devices on which they deploy our software. They...

    Started by fretallack‎, 05-20-2011 01:30 PM
    • Replies: 11
    • Views: 11,331
    10-22-2013, 03:54 AM Go to last post
  51. confidence interval plus some

    Hi I'm working on a question that asks me to find the constant c so that c(Xbar-X(n+1))/S has a t distribution. We're given that X1, X2, ......Xn,...

    Started by tidus‎, 03-05-2006 07:11 PM
    • Replies: 5
    • Views: 2,228
    03-08-2006, 07:45 PM Go to last post
  52. Confidence Interval Problem

    Problem: A careful study of the cause of failure of a large batch of computers showed that 30% of failures could be traced to power supply...

    Started by tiffi1099@msn.com‎, 07-18-2007 01:22 PM
    • Replies: 4
    • Views: 2,908
    07-19-2007, 11:27 AM Go to last post
  53. confidence interval problem

    i have a confidence interval problem that i have done and just looking for confirmation that it is correct: in a random sample of 50 bicycle...

    Started by subopolois‎, 03-10-2009 03:04 PM
    • Replies: 0
    • Views: 2,517
    03-10-2009, 03:04 PM Go to last post
  54. Confidence Interval problem

    Hello all, I need some help with the following question. Any assistance would be greatly appreciated. The Crossett Trucking Company claims...

    Started by primeo81‎, 12-07-2009 06:04 PM
    • Replies: 1
    • Views: 11,689
    12-08-2009, 03:46 AM Go to last post
  55. Question Confidence Interval Problem

    Hi all, I hope you guys can provide me some direction here. I'm a having some trouble with the following problem (use of excel allowed -- and...

    Started by kenny bania‎, 01-11-2010 09:16 PM
    • Replies: 3
    • Views: 3,649
    01-12-2010, 01:21 AM Go to last post
  56. Confidence Interval Problem

    Assume that you have a 95% confidence interval for a population mean based on a sample size of n1 = 50. If you wish to have a confidence interval of...

    Started by surajthemighty‎, 03-14-2016 05:41 PM
    • Replies: 0
    • Views: 2,231
    03-14-2016, 05:41 PM Go to last post
  57. Confidence Interval Problem #2

    The Human Resources Department of a large corporation wanted to determine if a majority of its employees were satisfied with their treatment by the...

    Started by tiffi1099@msn.com‎, 07-19-2007 08:31 AM
    • Replies: 2
    • Views: 3,333
    07-19-2007, 11:28 AM Go to last post
  58. Confidence Interval Problem, and more

    sorry, deleted.

    Started by mraway‎, 07-18-2007 02:37 PM
    • Replies: 0
    • Views: 2,331
    07-18-2007, 02:37 PM Go to last post
  59. Confidence Interval Problems (unknown S.D.)

    Problem 1: {Exercise 8.17} The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic...

    Started by Silverfox‎, 11-21-2007 08:11 PM
    • Replies: 0
    • Views: 10,924
    11-21-2007, 08:11 PM Go to last post
  60. Confidence Interval Question

    I have to find a 90% confidence interval for a mean, and i'm only given the S and the x-bar for a sample population of 60. How do I find the t* for...

    Started by kyle86‎, 01-28-2007 02:03 PM
    • Replies: 1
    • Views: 4,156
    01-28-2007, 02:27 PM Go to last post

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