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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. 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...

• Replies: 1
• Views: 196,626
07-16-2014, 11:01 AM
2. 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)...

• Replies: 0
• Views: 66,649
09-30-2005, 09:44 AM
1. Linear Regression - Hypothesis Testing

A study was conducted to determine if there was a linear relationship between a person's age and their peak heart rate. Data were collected from 8...

• Replies: 1
• Views: 3,956
11-27-2006, 08:21 PM
2. regression question

Hello all, I have the following regression table-outputs from SPSS: - Model Summary - ANOVA_b - Coefficients_a My question is on how can we...

• Replies: 1
• Views: 2,611
11-27-2006, 06:31 PM
3. One-Tailed Test problem

I'm just getting really confused on this one.. if anyone can help or point me in the right direction, that would be awesome! A gold mine...

• Replies: 0
• Views: 2,037
11-27-2006, 04:21 PM
4. 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...

• Replies: 1
• Views: 8,401
11-27-2006, 03:22 PM
5. 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...

• Replies: 1
• Views: 2,627
11-27-2006, 12:31 PM
6. 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...

• Replies: 1
• Views: 5,453
11-27-2006, 10:29 AM
7. 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...

• Replies: 0
• Views: 2,520
11-26-2006, 10:59 PM
8. 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...

• Replies: 0
• Views: 2,493
11-26-2006, 09:49 PM
9. 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...

• Replies: 2
• Views: 3,607
11-26-2006, 08:39 PM
10. 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...

• Replies: 0
• Views: 2,510
11-26-2006, 06:53 PM
11. 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...

• Replies: 0
• Views: 3,003
11-26-2006, 06:30 PM
12. 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...

• Replies: 3
• Views: 4,722
11-26-2006, 06:09 PM
13. 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...

• Replies: 0
• Views: 4,073
11-26-2006, 06:01 PM
14. 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...

• Replies: 1
• Views: 2,590
11-26-2006, 09:34 AM

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...

• Replies: 1
• Views: 2,677
11-25-2006, 09:13 PM
16. 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...

• Replies: 0
• Views: 2,222
11-25-2006, 05:02 PM
17. 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...

• Replies: 2
• Views: 3,288
11-25-2006, 02:03 PM
18. 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...

• Replies: 5
• Views: 2,225
11-25-2006, 12:28 PM
19. 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...

• Replies: 1
• Views: 1,850
11-25-2006, 12:28 PM
20. birthday problem

ignore this, I have solved the problem

• Replies: 0
• Views: 2,556
11-25-2006, 12:53 AM
21. 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...

• Replies: 1
• Views: 5,799
11-24-2006, 07:50 PM
22. 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...

• Replies: 2
• Views: 3,178
11-24-2006, 11:56 AM
23. 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...

• Replies: 0
• Views: 3,576
11-23-2006, 01:49 PM
24. 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...

• Replies: 9
• Views: 4,015
11-23-2006, 11:19 AM
25. 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...

• Replies: 2
• Views: 2,605
11-22-2006, 06:10 PM
26. 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...

• Replies: 2
• Views: 2,230
11-22-2006, 01:37 PM
27. 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...

• Replies: 1
• Views: 9,647
11-22-2006, 11:27 AM
28. 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...

• Replies: 0
• Views: 1,680
11-21-2006, 04:03 PM
29. 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...

• Replies: 2
• Views: 2,366
11-20-2006, 10:46 PM
30. 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...

• Replies: 1
• Views: 2,727
11-20-2006, 07:01 PM
31. 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...

• Replies: 2
• Views: 3,777
11-20-2006, 04:15 PM
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...

• Replies: 2
• Views: 2,212
11-20-2006, 04:04 PM
33. 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...

• Replies: 0
• Views: 1,472
11-20-2006, 08:41 AM
34. 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...

• Replies: 0
• Views: 2,208
11-19-2006, 11:42 PM
35. 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...

• Replies: 2
• Views: 2,577
11-19-2006, 02:51 PM
36. 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) ...

• Replies: 0
• Views: 2,118
11-18-2006, 10:38 PM
37. 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 µ: X =...

• Replies: 1
• Views: 4,203
11-18-2006, 06:18 PM
38. 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...

• Replies: 1
• Views: 2,836
11-18-2006, 06:04 PM
39. 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...

• Replies: 1
• Views: 3,034
11-18-2006, 05:55 PM
40. 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

• Replies: 0
• Views: 5,444
11-18-2006, 07:20 AM
41. 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...

• Replies: 2
• Views: 2,109
11-17-2006, 10:42 AM

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

• Replies: 0
• Views: 1,753
11-17-2006, 06:53 AM
43. 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...

• Replies: 0
• Views: 1,636
11-17-2006, 05:38 AM
44. 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)...

• Replies: 0
• Views: 1,735
11-17-2006, 01:24 AM
45. 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...

• Replies: 1
• Views: 2,497
11-17-2006, 12:14 AM
46. 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...

• Replies: 1
• Views: 3,481
11-16-2006, 11:55 PM
47. 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)...

• Replies: 1
• Views: 3,884
11-16-2006, 11:07 PM
48. 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...

• Replies: 0
• Views: 2,194
11-16-2006, 09:42 PM
49. 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...

• Replies: 0
• Views: 1,649
11-16-2006, 05:31 PM
50. 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: ...

• Replies: 0
• Views: 1,621
11-15-2006, 08:43 PM
51. 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...

• Replies: 1
• Views: 1,785
11-15-2006, 05:23 PM

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...

• Replies: 1
• Views: 2,344
11-15-2006, 04:58 PM
53. 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...

• Replies: 1
• Views: 8,462
11-15-2006, 03:20 PM
54. 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...

• Replies: 4
• Views: 22,806
11-15-2006, 03:15 PM
55. 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...

• Replies: 1
• Views: 2,091
11-15-2006, 02:53 PM
56. 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...

• Replies: 1
• Views: 2,041
11-15-2006, 02:45 PM
57. 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...

• Replies: 1
• Views: 1,897
11-15-2006, 02:11 PM
58. 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...

• Replies: 1
• Views: 2,594
11-13-2006, 06:14 PM
59. 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...

• Replies: 0
• Views: 10,831
11-13-2006, 03:00 PM
60. I need help!

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• Replies: 0
• Views: 2,338
11-13-2006, 02:16 PM

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