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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: 66,649
    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: 196,626
    07-16-2014, 11:01 AM Go to last post
  1. Please someone help me

    4. A political strategist believes that 58% of voters in a certain state support his candidate. He then commissions a poll of 600 voters and 53% of...

    Started by benchiefjr‎, 11-11-2006 11:00 PM
    • Replies: 2
    • Views: 8,822
    11-13-2006, 12:29 AM Go to last post
  2. sample mean z-score

    If a sample is selected from a normal population, then the probability that the sample mean will have a z-score less than z=2.55 is.......?

    Started by starfish794‎, 11-12-2006 03:01 PM
    • Replies: 1
    • Views: 8,248
    11-13-2006, 12:35 AM Go to last post
  3. Average of sample means

    If random samples, each with n=100 scores, are selected from a normal population with mu=1000 and standard deviation=50, and the mean is calculate...

    Started by starfish794‎, 11-12-2006 02:57 PM
    • Replies: 1
    • Views: 3,333
    11-13-2006, 12:39 AM Go to last post
  4. Exclamation I need help!

    this message has been deleted for his autor

    Started by Pietro‎, 11-13-2006 02:16 PM
    • Replies: 0
    • Views: 2,338
    11-13-2006, 02:16 PM Go to last post
  5. Help with predicted value problem using regression equation

    Use the computer display to answer the question. A collection of paired data consists of the number of years that students have studied Spanish and...

    Started by maharriso‎, 11-13-2006 03:00 PM
    • Replies: 0
    • Views: 10,831
    11-13-2006, 03:00 PM Go to last post
  6. New to statistic.. College.. ><

    hi, we just started on statistic today, and our teacher told us to search about how statistic are applied to the following (posted below). but...

    Started by dj_fling‎, 11-13-2006 09:18 AM
    • Replies: 1
    • Views: 2,594
    11-13-2006, 06:14 PM Go to last post
  7. Hypothesis Test question...

    I am new to hypothesis testing. I have this homework assignment and I am getting stuck. Here are the details: A reporter has claimed that cancer...

    Started by jacoment‎, 11-13-2006 05:16 PM
    • Replies: 1
    • Views: 1,897
    11-15-2006, 02:11 PM Go to last post
  8. Need Help with a Statistics Project

    Hello, I am finishing a college level Statistic course and for my final project I am supposed to provide Statistical proof that a Masters Degree...

    Started by Dig_Dug03‎, 11-14-2006 02:01 PM
    • Replies: 1
    • Views: 2,041
    11-15-2006, 02:45 PM Go to last post
  9. clarification on null and alternate hypothesis

    I have two questions. I'm pretty sure I have the right answers, but I just wanted clarification on my answers. 1. A university is thinking of...

    Started by Dolphins1544‎, 11-15-2006 09:46 AM
    • Replies: 1
    • Views: 2,091
    11-15-2006, 02:53 PM Go to last post
  10. Regression Analysis - what to do if population data is not normally distributed?

    Hi all I'd like to conduct a regression analysis using the entire population's data which I have at my disposal. However, the data of the...

    Started by student_T‎, 11-12-2006 08:11 AM
    • Replies: 4
    • Views: 22,806
    11-15-2006, 03:15 PM Go to last post
  11. I really need help with this matched pairs experiment!

    Do consumers prefer the taste of a cheeseburger from McDonald's or from Wendy's in a blind test in which neither burger is identified? Describe...

    Started by xjinax8807‎, 11-14-2006 09:02 PM
    • Replies: 1
    • Views: 8,462
    11-15-2006, 03:20 PM Go to last post
  12. standarad deviation problems

    Hi I need some help using the stdev. I have experiments with triplicate values as well as background values in triplicate and a positive control...

    Started by iman‎, 11-13-2006 06:09 AM
    • Replies: 1
    • Views: 2,344
    11-15-2006, 04:58 PM Go to last post
  13. Exclamation I need help!

    I need to compare a planned route schedule vs the actual route This is a delivery plan from my transportation course. The plan will always be...

    Started by Pietro‎, 11-13-2006 02:24 PM
    • Replies: 1
    • Views: 1,785
    11-15-2006, 05:23 PM Go to last post
  14. Angry Desperate for help! Probably an easy answer..

    I missed a day of class and now I'm lost on one of the questions that's probably very easy but I'm just looking too far into it. The question is: ...

    Started by LittleSweetFreak‎, 11-15-2006 08:43 PM
    • Replies: 0
    • Views: 1,621
    11-15-2006, 08:43 PM Go to last post
  15. Need help to select the "RIGHT" data analysis tech

    hi, I am struggling with regard to the right statistical technique for my data analysis. PLEASE .....help ........ - I got data from 3...

    Started by Mehul‎, 11-16-2006 05:31 PM
    • Replies: 0
    • Views: 1,649
    11-16-2006, 05:31 PM Go to last post
  16. Unhappy finding a sample size

    How do I find a sample size needed to ensure the standard error is a certain amount? I keep doing the problem according to what I think it should...

    Started by donnalee‎, 11-16-2006 09:42 PM
    • Replies: 0
    • Views: 2,194
    11-16-2006, 09:42 PM Go to last post
  17. Roulette Probability Problem

    Hello all, I am having trouble with solving this roulette problem. Play double zero roulette game. Pick odd/even +1, -1, (18/38) and (20/38)...

    Started by Alone2Gether‎, 11-14-2006 01:38 AM
    • Replies: 1
    • Views: 3,884
    11-16-2006, 11:07 PM Go to last post
  18. Statistical Significance Problem

    I'm working on a problem where I have a sample of 200 people. I have a total of 5 concepts which are viewed by each respondent, but are rotated so...

    Started by phuntyme‎, 11-15-2006 08:01 AM
    • Replies: 1
    • Views: 3,481
    11-16-2006, 11:55 PM Go to last post
  19. Smile Null and Alternate Hypothesis

    I have two questions. I'm pretty sure I have the right answers, but I just wanted clarification on my answers. 1. A university is thinking of...

    Started by Dolphins1544‎, 11-15-2006 09:45 AM
    • Replies: 1
    • Views: 2,497
    11-17-2006, 12:14 AM Go to last post
  20. Smile In Desperate need of Statistics homework help!!!!!

    :eek: This is the question on the review. The following is a continuous random variable: Start at (0,.3) to (1,.3) to (1.5,.5) to (2,.3) to (3,.3)...

    Started by micaelaalexander‎, 11-17-2006 01:24 AM
    • Replies: 0
    • Views: 1,735
    11-17-2006, 01:24 AM Go to last post
  21. coverting to T scores

    Hello, I'm using a measure called the Hospital Anxiety and Depression Scale and I wondering if there is a way to covert scores into T scores? I'm...

    Started by Zzzz‎, 11-17-2006 05:38 AM
    • Replies: 0
    • Views: 1,636
    11-17-2006, 05:38 AM Go to last post
  22. Please help~~

    An unbiased instrument for measuring distance makes random errors, the distributon of which has standard deviation n, and average of 0. You're...

    Started by abcboy‎, 11-17-2006 06:53 AM
    • Replies: 0
    • Views: 1,753
    11-17-2006, 06:53 AM Go to last post
  23. Difference between two sample populations.

    I have a set of approximately 1000 datapoints. The data points are for a bioburden assay on two "idential" pieces of equipment. Each piece of...

    Started by Tsilatipac‎, 11-16-2006 12:22 AM
    • Replies: 2
    • Views: 2,109
    11-17-2006, 10:42 AM Go to last post
  24. 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: 5,444
    11-18-2006, 07:20 AM Go to last post
  25. I need help please normal distribution

    I really need your help on this one I'm pretty sure is easy for you but I just need more info to make sure. A seller predicted an expected demand...

    Started by laton123‎, 11-17-2006 07:11 PM
    • Replies: 1
    • Views: 3,034
    11-18-2006, 05:55 PM Go to last post
  26. Linear Programming Problem

    Hi, I have a problem dealing with two decision variables, meaning that the linear programs could be plotted on a graph manually. My problem deals...

    Started by Emawk‎, 11-18-2006 08:02 AM
    • Replies: 1
    • Views: 2,836
    11-18-2006, 06:04 PM Go to last post
  27. Question Efficiency of estimators

    Hi, I have the following question: Based on a random sample of 2 observations, consider 2 competing estimators of the population mean : X =...

    Started by rhauserch‎, 11-17-2006 12:04 AM
    • Replies: 1
    • Views: 4,203
    11-18-2006, 06:18 PM Go to last post
  28. correlation

    Could somebody please help me with the correlation problem? U = a+ bx V= c+ dx i need to prove Correlation(u,v) = Correlation (x,y) ...

    Started by brunett1‎, 11-18-2006 10:38 PM
    • Replies: 0
    • Views: 2,118
    11-18-2006, 10:38 PM Go to last post
  29. Help needed

    Hi, I want to thank you for the help. It was very clear and understanding. I have another questions that i want to ask. I would appriciate your...

    Started by Jessie‎, 11-17-2006 09:06 PM
    • Replies: 2
    • Views: 2,577
    11-19-2006, 02:51 PM Go to last post
  30. Studying for Test

    Hi,:wave: I've got a test tomorrow and as I'm going over the practice questions, I'm realizing that I have no idea if I am doing this right or...

    Started by laurab94803‎, 11-19-2006 11:42 PM
    • Replies: 0
    • Views: 2,208
    11-19-2006, 11:42 PM Go to last post
  31. Help!

    I have another question: What area of the ocean surface would a 1 gallon of oils spill cover? Denote by u the average area covered by 1 gal oil...

    Started by Dolphins1544‎, 11-20-2006 08:41 AM
    • Replies: 0
    • Views: 1,472
    11-20-2006, 08:41 AM Go to last post
  32. Student t Distribution

    Hi Guys, I'm a little confused as to when to use the student t distribution and when to use the z. I know that if the standard deviation is...

    Started by laurab94803‎, 11-20-2006 12:22 PM
    • Replies: 2
    • Views: 2,212
    11-20-2006, 04:04 PM Go to last post
  33. Rejection of Outliers

    Is there a standard test to allow for the rejection of outliers in a set of data? I know there is a Q Test, but it typically is only used when there...

    Started by yank38‎, 11-13-2006 12:49 PM
    • Replies: 2
    • Views: 3,777
    11-20-2006, 04:15 PM Go to last post
  34. Trial of the Pyx

    In 1799 a guinea was supposed to weigh 128 grains (there are 360 grains in an ounce), so the 100 guineas in the Pyx should have weighed about 12,800...

    Started by thedoctaj‎, 11-20-2006 03:14 AM
    • Replies: 1
    • Views: 2,727
    11-20-2006, 07:01 PM Go to last post
  35. Confidence Intervals

    Hi! I have a question about confidence levels. A study revealed that 6 out of 25 people believe that aliens from outer space have visited the...

    Started by laurab94803‎, 11-20-2006 06:55 PM
    • Replies: 2
    • Views: 2,366
    11-20-2006, 10:46 PM Go to last post
  36. hello!

    Can U help me?? I don't know how to test significaton or correlation. I have a task- there are 3 pearson's r-and I must calculate partial...

    Started by Danica‎, 11-21-2006 04:03 PM
    • Replies: 0
    • Views: 1,680
    11-21-2006, 04:03 PM Go to last post
  37. Expected Value of X

    I'm asked to find the excpected value of x-bar, but I'm not sure what method to use here. The information I have: According to AAA, the average cost...

    Started by 402_Bill‎, 11-21-2006 08:47 PM
    • Replies: 1
    • Views: 9,647
    11-22-2006, 11:27 AM Go to last post
  38. Project Work-I'm Stuck!

    Hi, I'm doing a project for my statistics class. For this project, we surveyed a total of 164 students on campus, 85 males and 79 females. I...

    Started by laurab94803‎, 11-22-2006 12:42 PM
    • Replies: 2
    • Views: 2,230
    11-22-2006, 01:37 PM Go to last post
  39. Smile stats help!!!

    I have a question for youo.... I am not quite understand how to pick which formlulas for the different test when i have one tail and two tail...

    Started by allie7927‎, 11-19-2006 09:58 PM
    • Replies: 2
    • Views: 2,605
    11-22-2006, 06:10 PM Go to last post
  40. Complete Novice needs help with Analysis

    Hi all, Hope you are well. I'm in a situation with regards to a survey I have completed for my final year at University. The survey aims to...

    Started by euan‎, 11-14-2006 07:15 AM
    • Replies: 9
    • Views: 4,015
    11-23-2006, 11:19 AM Go to last post
  41. Combining two medians in a ratio.

    Here is the problem. The risk of developing colon cancer in 2002 based on following millions of people is 50 per 100,000. The se for this...

    Started by Peter‎, 11-23-2006 01:49 PM
    • Replies: 0
    • Views: 3,576
    11-23-2006, 01:49 PM Go to last post
  42. Talking Chi Squared forumla

    Hi--- I have written in my notes to formulas and i was just wondering if they are the same thing.... the first one is X squared = the sum...

    Started by allie7927‎, 11-22-2006 07:04 PM
    • Replies: 2
    • Views: 3,178
    11-24-2006, 11:56 AM Go to last post
  43. Gage R & R Anova interpretation guidelines

    I am familar with 2 way Anova, but a friend asked me with some help on interpreting Gage R & R (Repeatability and Reproducibility, 2 way ANOVA...

    Started by RandyLewisKemp‎, 11-24-2006 04:15 PM
    • Replies: 1
    • Views: 5,799
    11-24-2006, 07:50 PM Go to last post
  44. birthday problem

    ignore this, I have solved the problem

    Started by abcboy‎, 11-25-2006 12:53 AM
    • Replies: 0
    • Views: 2,556
    11-25-2006, 12:53 AM Go to last post
  45. Cool analysis help

    I have some data that I'm trying to run some analysis on, but I can't figure out which test will be the best. I have both interval and nominal...

    Started by Marena‎, 11-25-2006 12:53 AM
    • Replies: 1
    • Views: 1,850
    11-25-2006, 12:28 PM Go to last post
  46. Population Proportions

    Hi, I'm working with some survey data for a project. My sample size is 85 and the standard deviation is unknown. I think because the standard...

    Started by laurab94803‎, 11-23-2006 11:55 AM
    • Replies: 5
    • Views: 2,225
    11-25-2006, 12:28 PM Go to last post
  47. unstandardized regression

    I don't really understand how to approach this question. I am a novice with stats. "What does an unstandardized regression coefficient of 1.3 mean...

    Started by Elizabeth07‎, 11-24-2006 01:26 PM
    • Replies: 2
    • Views: 3,288
    11-25-2006, 02:03 PM Go to last post
  48. easy (to you guys) regression work

    i have to do a confidence interval and a prediction interval on a regression problem. Basically the questions are: Obtain a 95% confidence...

    Started by evanmorgan‎, 11-25-2006 05:02 PM
    • Replies: 0
    • Views: 2,222
    11-25-2006, 05:02 PM Go to last post
  49. need help please

    Hi everyone, If you could help with these questions that will be awsome. `1)What is a useful test that examines whether the change in a nominal...

    Started by Jessie‎, 11-24-2006 08:52 PM
    • Replies: 1
    • Views: 2,677
    11-25-2006, 09:13 PM Go to last post
  50. dependent t-test

    Question "What statistical technique is the extentsion of the dependent t-test when one group is assessed three or more times using the same...

    Started by Elizabeth07‎, 11-25-2006 02:41 PM
    • Replies: 1
    • Views: 2,590
    11-26-2006, 09:34 AM Go to last post
  51. Hypothesis Testing

    Please help me show the 5 step Hypothesis testing to find a solution to this problem. A restaurant in El Paso claims that it will serve a customer...

    Started by fantasydawn‎, 11-26-2006 06:01 PM
    • Replies: 0
    • Views: 4,073
    11-26-2006, 06:01 PM Go to last post
  52. 5 Step Hypothesis Testing

    I am taking this course through distance education and Hypothesis testing has been hard to learn on my own. Please help me show the 5 steps to find a...

    Started by fantasydawn‎, 11-26-2006 05:32 PM
    • Replies: 3
    • Views: 4,722
    11-26-2006, 06:09 PM Go to last post
  53. z test for a proportion

    It has been claimed that at O.C.U. at least 35% of the students live on campus. From a sample of 300 students, 98 live on campus. Does the evidence...

    Started by fantasydawn‎, 11-26-2006 06:30 PM
    • Replies: 0
    • Views: 3,003
    11-26-2006, 06:30 PM Go to last post
  54. Comparing two means from independent populations

    A researcher wanted to determine if there was a difference in the average age of a bride and the average age of a groom. At α = 0.05, test the...

    Started by fantasydawn‎, 11-26-2006 06:53 PM
    • Replies: 0
    • Views: 2,510
    11-26-2006, 06:53 PM Go to last post
  55. degrees of freedom etc.

    Would you mind checking my answers to these questions? :eek: Question: A researcher wants an answer to the following question: Does the...

    Started by Elizabeth07‎, 11-26-2006 01:19 PM
    • Replies: 2
    • Views: 3,607
    11-26-2006, 08:39 PM Go to last post
  56. 2 Tail Hypothesis

    A shopper felt that there was no difference between the price of Ever ready batteries and DuraCell batteries. To test her claim she checked the...

    Started by fantasydawn‎, 11-26-2006 09:49 PM
    • Replies: 0
    • Views: 2,493
    11-26-2006, 09:49 PM Go to last post
  57. What Kind of Analysis would I use?

    For the following question, what kind of Statistical formula/test would I use to find the answer? Is this a regression question, what kind of...

    Started by fantasydawn‎, 11-26-2006 10:59 PM
    • Replies: 0
    • Views: 2,520
    11-26-2006, 10:59 PM Go to last post
  58. one tail or two tail tests

    Hello! I just have a quick question! How do I figure out whether I have one tail or a two tail test? This is the part where I am confused? So if...

    Started by allie7927‎, 11-27-2006 10:14 AM
    • Replies: 1
    • Views: 5,453
    11-27-2006, 10:29 AM Go to last post
  59. Estimation

    Can somebody tell me if you think the answers I chose are correct? Thanks 1. In general, the goal of estimation is to a) determine whether or not...

    Started by starfish794‎, 11-27-2006 12:26 PM
    • Replies: 1
    • Views: 2,627
    11-27-2006, 12:31 PM Go to last post
  60. repeated-measures t statistic

    What values can be estimated using the repeated-measures t statistic? a) the value of an unknown population mean b) the difference between two...

    Started by starfish794‎, 11-27-2006 12:42 PM
    • Replies: 1
    • Views: 8,401
    11-27-2006, 03:22 PM Go to last post

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