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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: 196,753
    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: 66,755
    09-30-2005, 09:44 AM Go to last post
  1. 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: 3,106
    12-07-2005, 11:34 PM Go to last post
  2. 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: 2,555
    12-07-2005, 09:52 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: 5,262
    12-07-2005, 12:44 AM Go to last post
  4. 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: 10,385
    12-06-2005, 11:17 PM Go to last post
  5. 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
  6. Prediction Intervals

    Can someone help me with prediction intervals ? I dont get understand how you get the t-distrbution of (Y0 - U~) / (sigma * sqrt(1 +1/n)) where...

    Started by r007k‎, 12-06-2005 02:27 PM
    • Replies: 1
    • Views: 3,995
    12-06-2005, 03:08 PM Go to last post
  7. Exclamation Stuck on a simple problem

    The problem is as follows: The amount of money bob earns has an expected value of $30,000 and a standard deviation of $3000. The amount fo money...

    Started by midvinter‎, 12-06-2005 01:27 PM
    • Replies: 3
    • Views: 3,461
    12-06-2005, 02:44 PM Go to last post
  8. Checking to see if i am correct

    A roulette wheel has 18 numbers colred red, 18 colored black, and 2 (zero and double zero) that are uncolored. If you bet 1 unit on the outcome red,...

    Started by midvinter‎, 12-06-2005 01:30 PM
    • Replies: 1
    • Views: 3,724
    12-06-2005, 01:46 PM Go to last post
  9. Exclamation Need Help Asap!! (z-scores)

    :eek: I am trying to figure out how to find the z-scores that separate the middle 88% of the data from the area in the tails of the standard normal...

    Started by heylee2005‎, 12-05-2005 11:04 PM
    • Replies: 2
    • Views: 22,844
    12-06-2005, 12:05 AM Go to last post
  10. confidence interval

    Hi, I am new to this and not quite sure what I am doing. I am hoping you will be able to help me with a few problems. I am not sure where to...

    Started by lindslan‎, 12-05-2005 09:57 PM
    • Replies: 1
    • Views: 3,703
    12-05-2005, 10:14 PM Go to last post
  11. Confidence Intervals

    Can anyone let me know if this sounds right. A scientist is researching a species of squid. A sample of 25 full grown squid is obtained and the...

    Started by lost822‎, 12-05-2005 06:39 PM
    • Replies: 1
    • Views: 2,586
    12-05-2005, 07:50 PM Go to last post
  12. Significance (t-statistic)

    I'm not sure how to answer this one: Q: You are testing Ho: mu = 0 against Ha: mu (does not equal) 0 based on an SRS of 20 observations from a...

    Started by mackerbuddy‎, 12-04-2005 03:29 AM
    • Replies: 3
    • Views: 9,402
    12-04-2005, 10:22 PM Go to last post
  13. Inference about a Population Proportion - Margin of Error and Sample Size

    Last one :) Q: An automobile manufacturer would like to know what proportion of its customers are not satisfied with the service provided by...

    Started by mackerbuddy‎, 12-04-2005 04:19 AM
    • Replies: 3
    • Views: 11,484
    12-04-2005, 10:20 PM Go to last post
  14. Two-Sample Interpretation of data

    Ok this one if gonna be a little hard to copy from the book.... Q: A study of the self-concept of seventh-grade students asked if male and...

    Started by mackerbuddy‎, 12-04-2005 04:11 AM
    • Replies: 3
    • Views: 8,572
    12-04-2005, 10:18 PM Go to last post
  15. Two-sample t confidence interval

    Am I correct??!! Corn yields (bushels per acre) for experimental plots controlled to have 1 weed per meter of row and 3 weeds per meter of row: ...

    Started by mackerbuddy‎, 12-04-2005 03:58 AM
    • Replies: 2
    • Views: 7,532
    12-04-2005, 12:26 PM Go to last post
  16. One-sample 't' statistic

    I'm back :) This is my last stats assignment for this semester and I have a few questions that I'm not sure about. I'll post each one in a new...

    Started by mackerbuddy‎, 12-04-2005 03:18 AM
    • Replies: 1
    • Views: 10,249
    12-04-2005, 08:52 AM Go to last post
  17. interaction

    Hi... I need some help with the basics... What is meant by an interaction in an experiment? And... Can you please tell me a link where I can find...

    Started by Erida‎, 12-02-2005 06:54 PM
    • Replies: 3
    • Views: 3,071
    12-04-2005, 05:59 AM Go to last post
  18. Misapplication of Hypothesis Testing?

    I was asked the following question and would like to hear your view: "In the year 2005 National exam, 57.4% of the students who sat for the...

    Started by mutnauk05‎, 11-30-2005 04:37 AM
    • Replies: 11
    • Views: 4,053
    12-01-2005, 09:15 PM Go to last post
  19. Question Hypothesis

    HI, I have a question about null and alternate hypothesis. So basically the test is to see if we can reject the null (HO). I am not going to test...

    Started by jaben‎, 12-01-2005 02:21 PM
    • Replies: 3
    • Views: 3,167
    12-01-2005, 02:47 PM Go to last post
  20. The confidence interval

    I have a question: I am confused, What is the confidence interval?

    Started by AlexKom‎, 11-30-2005 06:46 PM
    • Replies: 1
    • Views: 2,526
    11-30-2005, 08:42 PM Go to last post
  21. Experiment

    Hello! I have a question: In the experiment I have 4 treatments: 1)regular wash cycle/cold water 2)Delicate wash cycle/hot water 3)Regular/hot...

    Started by AlexKom‎, 11-30-2005 06:17 PM
    • Replies: 1
    • Views: 2,899
    11-30-2005, 06:20 PM Go to last post
  22. Help

    I too am having trouble with ANOVA. I have 2 questions that I need assistance with. Question 1: Test the claim that the samples come from...

    Started by 1NAMILL‎, 11-29-2005 03:58 PM
    • Replies: 3
    • Views: 8,688
    11-29-2005, 10:11 PM Go to last post
  23. experimental design in speech,hearing and language

    Hi... I am in a loop trying to describe the use of multiple factor designs in speech, hearing and language experiments. Does anybody know any...

    Started by Erida‎, 11-29-2005 04:21 PM
    • Replies: 2
    • Views: 2,762
    11-29-2005, 04:30 PM Go to last post
  24. Anova

    Hi, i was having trouble calculating two-way ANOVA's.. i couldnt quite get the equations that my professor had posted can .. is there a website...

    Started by puestadeluna‎, 11-29-2005 01:56 PM
    • Replies: 1
    • Views: 2,497
    11-29-2005, 02:29 PM Go to last post
  25. Sampling

    Hi, I was looking at your examples for determining the minimum sample size required to estimate a population. Ok with Z^2, you put 1.96, and that is...

    Started by jaben‎, 11-28-2005 12:34 PM
    • Replies: 5
    • Views: 3,348
    11-28-2005, 01:20 PM Go to last post
  26. Indicated probability or percentage of sampling error

    I have tried this problem for three days, and I cannot find the example of how to do this in my book, or online anywhere. Scores on an apptitude...

    Started by tdurepo‎, 11-26-2005 02:41 PM
    • Replies: 3
    • Views: 21,632
    11-28-2005, 09:27 AM Go to last post
  27. sampling distributions

    i really need help in sampling distributions can you help ?

    Started by djbigsteph‎, 11-27-2005 10:47 PM
    • Replies: 9
    • Views: 3,778
    11-27-2005, 11:38 PM Go to last post
  28. Transforming the data

    Hello! I can't understand: In order to transform the data to make it appear more linear, how can I choose what transformation to use, if I don't...

    Started by AlexKom‎, 11-27-2005 12:05 PM
    • Replies: 8
    • Views: 5,007
    11-27-2005, 10:40 PM Go to last post
  29. Help

    I need some assistance with the following 2 questions: Question 1: Assume that you want to test the claim that the paired sample data come from...

    Started by 1NAMILL‎, 11-26-2005 09:41 AM
    • Replies: 3
    • Views: 5,149
    11-27-2005, 10:11 PM Go to last post
  30. z test hypothesis

    in z test hypothesis if we look something fewer than X%, do we use upper or lower tail test?

    Started by demolay‎, 11-25-2005 12:38 PM
    • Replies: 3
    • Views: 4,746
    11-27-2005, 07:53 PM Go to last post
  31. Arrow What re-expression to use?

    Hello! I) I can't understand, how can I determine what re-expression to use in order to linearize the scatterplot by just looking at the...

    Started by AlexKom‎, 11-24-2005 09:46 PM
    • Replies: 1
    • Views: 3,069
    11-27-2005, 07:50 PM Go to last post
  32. Exclamation Stats Help Needed

    I've been going crazy with this problem, and I'm not sure if my solution for it is correct.. please help In a survey of 10,572 college students,...

    Started by Calizone20‎, 11-26-2005 07:33 PM
    • Replies: 1
    • Views: 2,537
    11-27-2005, 06:36 PM Go to last post
  33. Help

    This is the 2nd question: Construct a confidence interval for the mean of the differences d for the population of paired data. Assume that the...

    Started by 1NAMILL‎, 11-26-2005 10:17 AM
    • Replies: 1
    • Views: 3,781
    11-27-2005, 06:24 PM Go to last post
  34. Are These Correlation Coefficients Accurate?

    Greetings. I am stumbling around in EXCEL trying to figure out whether or not my correlation coefficients are accurate. I have a gut feeling that...

    Started by tfj‎, 11-25-2005 09:31 PM
    • Replies: 6
    • Views: 6,527
    11-27-2005, 06:13 PM Go to last post
  35. help with stats problem

    This is the problem and I'm at a loss at what to do. I've tried a few things but feel like it's not correct. Can anyone help? Thanks! A...

    Started by MDM88‎, 11-26-2005 07:47 PM
    • Replies: 1
    • Views: 5,581
    11-27-2005, 05:32 PM Go to last post
  36. statistics help needed.

    Hey guys I've got several questions about statistics. Here's the first one. 1. Suppose X is a discrete random variable that takes on the three...

    Started by Tereno‎, 11-17-2005 02:09 PM
    • Replies: 5
    • Views: 3,195
    11-26-2005, 02:56 PM Go to last post
  37. Probability: Is this right?

    Ok..here's the question. The general manager of an amusement park wants to estimate the length of time people spend in the park. From the data...

    Started by StatsNoob‎, 11-26-2005 12:41 AM
    • Replies: 2
    • Views: 3,117
    11-26-2005, 02:16 PM Go to last post
  38. 1970 Draft Lottery

    And also I have a trouble with this: Based on the box plots, which statement is correct? a) There seems to be no relationship between birth month...

    Started by AlexKom‎, 11-25-2005 11:51 PM
    • Replies: 1
    • Views: 4,684
    11-26-2005, 12:12 AM Go to last post
  39. Randomization

    Hello! There is a problem: Which of the following sources of bias is eliminated by randomization? a) Researchers have a desired outcome in...

    Started by AlexKom‎, 11-25-2005 11:36 PM
    • Replies: 1
    • Views: 3,674
    11-26-2005, 12:08 AM Go to last post
  40. Ti-83 geometpdf question

    Ok...here is the question from my review.... David is answering the telephone during a radio broadcast fund drive. People phone in pledges of $5...

    Started by StatsNoob‎, 11-24-2005 10:37 PM
    • Replies: 1
    • Views: 5,879
    11-25-2005, 02:25 PM Go to last post
  41. Sampling Distribution??

    Ok...the question is... "Records at the College of Engineering show that 62% of all freshman who declare EE (electrical engineering) as their...

    Started by StatsNoob‎, 11-24-2005 02:04 AM
    • Replies: 5
    • Views: 4,067
    11-24-2005, 10:14 PM Go to last post
  42. Dependent Sample Help

    The question is asking the following: The two data sets are dependent. Find to the nearest tenth (one decimal place). A 64 53 57 63 51 B...

    Started by 1NAMILL‎, 11-24-2005 10:40 AM
    • Replies: 1
    • Views: 4,719
    11-24-2005, 10:43 AM Go to last post
  43. Standard Error

    Below are two similar problems. For the question above I can do i and know how to do iii but don't see how to get the standard error of eta....

    Started by macro90‎, 11-24-2005 05:33 AM
    • Replies: 1
    • Views: 2,669
    11-24-2005, 05:54 AM Go to last post
  44. Smile Combined salary

    Hi! There is a problem: The following computer output comes from weekly salary information for a small company. Gender N Min Q1...

    Started by AlexKom‎, 11-23-2005 04:55 PM
    • Replies: 2
    • Views: 4,449
    11-23-2005, 07:50 PM Go to last post
  45. Red face A basketball team problem

    Hello! Please help me in this problem: A basketball team with 11 players of different heights trades its shortest player to another team for a...

    Started by AlexKom‎, 11-23-2005 12:02 AM
    • Replies: 1
    • Views: 4,670
    11-23-2005, 12:14 AM Go to last post
  46. Filling in ANOVA table

    Below is a past exam question... Don't worry about i or ii because I can do them. r = 0.8 and 95% CI for rho is (0.71, 0.87), which is...

    Started by macro90‎, 11-22-2005 10:57 PM
    • Replies: 2
    • Views: 12,737
    11-22-2005, 11:17 PM Go to last post
  47. pls help

    hi everyone i really really need help im soo behind on my stats work im relaly stuck on 2 assignments with a few questions left on both that i need...

    Started by papps‎, 11-22-2005 02:48 AM
    • Replies: 1
    • Views: 3,458
    11-22-2005, 10:59 AM Go to last post
  48. statistics

    what is the importance of statistics in business

    Started by byrona‎, 11-21-2005 01:25 PM
    • Replies: 1
    • Views: 2,336
    11-21-2005, 02:42 PM Go to last post
  49. Question Getting rid of transient state

    Hi, I'm doing some simulations. I have some time series data. The thing is that, when I plot the moving average graph, there is a transient...

    Started by Escualida‎, 11-21-2005 01:09 AM
    • Replies: 1
    • Views: 2,594
    11-21-2005, 08:11 AM Go to last post
  50. Help with Hypothesis Testing

    :confused: Hello. Let me start off by saying Thank You :) for helping with people like me who are statistically challenged. I would like to think...

    Started by lostinstats‎, 11-20-2005 04:59 AM
    • Replies: 1
    • Views: 3,234
    11-20-2005, 09:34 AM Go to last post
  51. Normal Distribution

    Can anyone explain normal distribution? Is the following normally distributed and if so why, if no then why not? Is is close? NN Valid 25 ...

    Started by bkeagles‎, 11-18-2005 10:52 PM
    • Replies: 5
    • Views: 3,743
    11-19-2005, 11:12 PM Go to last post
  52. Help Again

    If forgot, I had one more. I'm stuck on this equation too: A quadratic regression model is fit to a set of sample data consisting of 6 pairs of...

    Started by 1NAMILL‎, 11-19-2005 10:08 AM
    • Replies: 5
    • Views: 3,374
    11-19-2005, 10:56 PM Go to last post
  53. Help

    I'm having a little trouble with the following question: Four pairs of data yield r = 0.942 and the regression equation (predicated value of y...

    Started by 1NAMILL‎, 11-18-2005 09:42 PM
    • Replies: 6
    • Views: 7,989
    11-19-2005, 10:10 PM Go to last post
  54. Cool more Estimation....

    This question asks for relative efficiency.. X and Y are random sample from a population with mean mu and variance sigma squared. (assume that X and...

    Started by Michelle‎, 11-19-2005 06:36 PM
    • Replies: 1
    • Views: 3,009
    11-19-2005, 06:41 PM Go to last post
  55. Biased and Unbiased Estimators

    Hi, I'm not sure how to find the bias estimator. For example, If we let X and Y be a random sample from a population with mean=1, compute the bias...

    Started by Michelle‎, 11-18-2005 07:53 PM
    • Replies: 6
    • Views: 6,006
    11-19-2005, 06:27 PM Go to last post
  56. help pleasee

    I am completely losttttttt & confused...I've tried to solve this with two different formulas. (smilpling distribution of mean of x1 - mean of x2)...

    Started by ecohelp‎, 11-19-2005 12:58 PM
    • Replies: 1
    • Views: 2,756
    11-19-2005, 03:05 PM Go to last post
  57. Question Simultaneous Hypothesis Tests

    Hi, this is my first post here, so I hope this is the right place to write it. I was wondering how can I test these hypothesis simultaneously: ...

    Started by Escualida‎, 11-13-2005 04:40 PM
    • Replies: 7
    • Views: 3,970
    11-18-2005, 07:49 PM Go to last post
  58. Question repeated measures

    Which analysis is appropriate if you have repeated measures of continous explanatory variables and one measure of a continuous outcome variable?

    Started by gill‎, 11-17-2005 08:11 AM
    • Replies: 3
    • Views: 3,369
    11-17-2005, 07:54 PM Go to last post
  59. Question Sequential tests and Type II error

    I am performing a series of sequential hypothesis tests. I'm using the Bonferroni inequality, and a global alpha, to calculate alpha for each of the...

    Started by Escualida‎, 11-13-2005 04:49 PM
    • Replies: 2
    • Views: 2,816
    11-16-2005, 11:48 PM Go to last post
  60. anova

    can anova be used for for multiple comparisons? will it be significant? also is the dunnett test more powerful than the Tukey and Newman Keuls?...

    Started by puestadeluna‎, 11-16-2005 11:07 AM
    • Replies: 1
    • Views: 3,023
    11-16-2005, 12:06 PM Go to last post

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