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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,739
09-30-2005, 09:44 AM
2. ### 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: 196,734
07-16-2014, 11:01 AM
1. ### 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...

• Replies: 1
• Views: 3,526
12-06-2005, 04:41 PM
2. ### 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...

• Replies: 4
• Views: 10,381
12-06-2005, 11:17 PM
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...

• Replies: 1
• Views: 5,259
12-07-2005, 12:44 AM
4. ### 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...

• Replies: 1
• Views: 2,553
12-07-2005, 09:52 PM
5. ### 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...

• Replies: 3
• Views: 3,105
12-07-2005, 11:34 PM
6. ### a lil' more help

:shakehead :wave: okay i am stuck on this one. a recent study in a city stated that the average of retired men was 63.5 years. A sample of 20...

• Replies: 1
• Views: 2,014
12-08-2005, 11:53 AM
7. ### Hypothesis testing

Is it possible to have the "=" in the alternative hypothesis? In anassignment I am asked to try to falsify a hypothesis (and surely it is not...

• Replies: 1
• Views: 2,657
12-09-2005, 07:53 AM
8. ### ANOVA plots

Hi all, Last minute stats exam panic.... In a 'theory' question we could be asked to give example plots for ANOVAs where: There is/isn't an...

• Replies: 2
• Views: 6,859
12-09-2005, 08:45 AM
9. ### Statistics

These are heights and weights for five randomly-selected adults. Units are centimeters and kilograms, respectively. height 183 172 190 167 193...

• Replies: 3
• Views: 2,826
12-09-2005, 11:40 AM
10. ### help

I am having trouble with the folowing question: Use the Poisson Distribution to find the indicated probability. A computer salesman averages...

• Replies: 7
• Views: 4,651
12-09-2005, 04:03 PM
11. ### Multiple Choice Question

Hello! Here is the problem: A group of eight people work on the 5th floor of the building.They all decide they want to lose weight by...

• Replies: 4
• Views: 13,459
12-10-2005, 09:25 PM
12. ### Need help with Hypothesis test!!!

Okay I can't seem to figure out this problem. Would really appreciate any help that can be given. A sample of 81 account balances of a credt...

• Replies: 3
• Views: 5,156
12-14-2005, 08:14 AM
13. ### Hypothesis Testing question

Hi, I am new to this forum. I need desperate help. I am taking a QMB 3200 class and there is no book so I am lost. Here is my question: ...

• Replies: 6
• Views: 3,254
12-14-2005, 12:50 PM
14. ### Hypothesis testing

Here I am again....Thank you so much for helping me out yesterday. I am lost when it comes to Hypothesis testing....What do you think about this...

• Replies: 4
• Views: 4,184
12-14-2005, 02:52 PM
15. ### Determining level of confidence when provided with intervals

Hello to the forum... Just waiting for the results of my mid-term and would like to thank some members of this forum for their helpful direction! ...

• Replies: 4
• Views: 4,632
12-14-2005, 05:39 PM
16. ### post test question

Hello all! can anyone tell me what are the benefits of conducting a post-test only assessment? ( no pre testing) thanks -vogz32

• Replies: 2
• Views: 3,685
12-14-2005, 08:34 PM
17. ### online/clothing store purchases

I have this project for my stats class and I am about clueless, here is the question. A. cash back when the consumer makes an online purchase; and...

• Replies: 5
• Views: 5,841
12-16-2005, 06:01 AM
18. ### Transformation then Standardization...?

Hi, I was wondering if anyone could answer what is probably quite an obvious question... I've got a dataset with 9 variables, of which I am...

• Replies: 3
• Views: 11,430
12-18-2005, 12:10 PM
19. ### Thanks

I just wanted to say thank you to all of you who helped me with Statistics. I received an "F" on my midterm. However, by the time finals came...

• Replies: 1
• Views: 2,498
12-20-2005, 12:56 PM
20. ### Natural Log

Hi! I am doing Biomedical studies in proteomics. As I am comparing groups by spot intensity using a computer software ,which is pretty sensitive,...

• Replies: 1
• Views: 4,132
12-21-2005, 08:05 AM
21. ### The Distribution of Blood cholesterol level

Im really stuck on this problem could someone please help? The distribution of blood cholesterol level in the population of young men aged 20 to...

• Replies: 4
• Views: 6,337
01-03-2006, 12:23 AM
22. ### School Girls

Could someone help me get started on this problem? How large a sample of school girls having a standard deviation of 25 points in their IQ scores...

• Replies: 4
• Views: 2,907
01-03-2006, 07:10 AM
23. ### Did I do this correctly?

We suspect that on the average students will score higher on their second attempt at the SAT mathematics exam than on their first attempt. Suppose...

• Replies: 1
• Views: 5,971
01-04-2006, 07:52 AM

High school students who take the SAT mathematics exam a second time generally score higher than on their first try. The change in score has a...

• Replies: 1
• Views: 9,526
01-04-2006, 07:53 AM
25. ### Need Help again

You have the NAEP quantitative scores for an SRS of 800 young men. You plan to test hypotheses about the population mean score, Ho: u=280 and Ha: u...

• Replies: 5
• Views: 5,855
01-04-2006, 03:44 PM
26. ### Is this right.

You have an srs of size n=15 from a normal distribution with standard deviation=1. You wish to test Ho: u=0 and Ha: u >0. You decide to reject Ho...

• Replies: 2
• Views: 2,390
01-05-2006, 09:54 AM
27. ### standard error of mean

If I have a single data point and take that point as an estimate of the mean of the population, how would I estimate the standard error of the mean?

• Replies: 4
• Views: 3,354
01-08-2006, 06:48 PM
28. ### repeated measures quiz

Can someone please give me advice on analyzing repeated measures data. The thing I can't get past is the fact that the time between observations (lag...

• Replies: 1
• Views: 2,946
01-11-2006, 03:49 PM
29. ### Research and Profit

I need some help with this problem. My cooperation is interested in the relationship of funds expended in research and cooperation profit. The...

• Replies: 1
• Views: 2,712
01-12-2006, 08:25 AM
30. ### need help with transformation

Hey all I have questions about transforming variables. I'm sorry if this comes across as stupid. I have a set of variables (45 variables with...

• Replies: 3
• Views: 2,747
01-12-2006, 09:21 AM
31. ### Lost and need HELP!

I need assistance on the following problem (I'll state it and then state my thoughts on it so far): Scores made on a certain aptitude test by...

• Replies: 2
• Views: 2,858
01-12-2006, 07:33 PM
32. ### Multiple choice

Hello, I have some questions: A researcher wants to determine the mean income of adults in a particular state. She decides to tae a random sample...

• Replies: 4
• Views: 8,519
01-13-2006, 08:47 AM
33. ### Percentages if values

Will you please explain to me how I should set up and solve this problem? In a normal distribution with mu = 200 and standard deviation = 30, Find...

• Replies: 1
• Views: 2,832
01-13-2006, 07:59 PM
34. ### An opinion poll

Is this the correct answer? An opinion poll asks 1500 randomly chosen United States residents their opinions about relations with the nations of...

• Replies: 1
• Views: 3,266
01-16-2006, 09:57 AM
35. ### A student organization

Is this answer correct? A student organization plans to ask 100 randomly selected students how much they spent on textbooks last semester. You...

• Replies: 1
• Views: 3,721
01-16-2006, 10:00 AM
36. ### The weights of newborn children

Could someone please check my answer? The weights of newborn children in the United States vary according to the normal distribution with mean 7.5...

• Replies: 1
• Views: 16,998
01-16-2006, 10:01 AM
37. ### Z and T statistics

Could some body please check my answers on this question? I really think I screwed this one up. Question: A friend who hears that you are taking...

• Replies: 2
• Views: 4,088
01-17-2006, 12:39 AM

Did I do this correct? Before an intensive TV advertising campaign, the producers of Nike athletic shoes find that 29 of a random sample of 200...

• Replies: 1
• Views: 4,826
01-17-2006, 01:00 AM
39. ### Did I give the correct answers to this question

You are reading an article in your field that reports several statistical analyses. The article says that the P-value for a significance test is...

• Replies: 2
• Views: 4,689
01-17-2006, 10:05 AM

A STUDY EXAMINED HOW LONG AIRCRAFT AIR CONDITIONING UNITS OPERATED AFTER BEING REPARIED. HERE ARE THE OPERATING TIMES IN HOURS FOR ONE UNIT. 97 51...

• Replies: 4
• Views: 3,317
01-18-2006, 01:57 PM

QUESTION- THE DRUG AZT WAS THE 1ST EFFECTIVE TREATMET FOR AID. AN IMPORTANT MEDICAL EXPERIMENT DEMONSTRATED THAT REGULAR DOSES OF AZT DELAY THE ONSET...

• Replies: 8
• Views: 4,103
01-19-2006, 07:54 PM
42. ### Help with inflection point in a curvilinear relationship

Hi all, I am reading an article that does a panel poission regression and finds out the following function: Y= 2,22 + 0,08X1 -0,0001 X1SQ ...

• Replies: 1
• Views: 4,687
01-19-2006, 08:31 PM
43. ### equality of two samples

Hello, I have 10 values of two sample for each month for the 1987-1996 period. Is it possible to test if these two samples are equal? if so, which...

• Replies: 3
• Views: 2,661
01-19-2006, 10:21 PM
44. ### Probability Question

Hi can you help me with this problem please. a bank claimed 40% of its customers use internet banking. in random checks they found 170 of the 500...

• Replies: 1
• Views: 2,695
01-20-2006, 04:00 PM
45. ### true mean

Hi can you help me with another question please. i have been given the critical dimension of a random sample of 16 auto crankshafts measured in mm...

• Replies: 1
• Views: 9,985
01-20-2006, 04:03 PM
46. ### Help w/ gadgets, pls

I am in a basic online stats course. So far, I am doing ok with figuring out how to do the hw. My problem is that I have been out of school for...

• Replies: 4
• Views: 2,892
01-21-2006, 08:26 PM
47. ### questions

I have 2 questions for a class that I am working on. The first one, I did and thought it was right but am now starting to doubt my answer! 1....

• Replies: 2
• Views: 3,731
01-21-2006, 08:33 PM
48. ### Normal Distribution

In a normal distribution with u=200 and o=30 find the percentage of values that are between 180 and 195. If I could get an example of this that...

• Replies: 1
• Views: 2,350
01-22-2006, 08:53 PM
49. ### Normal Distribution

In a normal distribution with u=200 and o=30, find the percentage of values that are between 200 and 225 z= (200-200)/30 =0/30 = 0 ...

• Replies: 3
• Views: 2,439
01-23-2006, 06:00 AM
50. ### Stats

The length of time for students to complete the Statistics final exam is normally distributed with mean 75 minutes and standard deviation 15 minutes....

• Replies: 1
• Views: 2,135
01-23-2006, 06:05 AM
51. ### speeding ND

A traffic survey revealed that the speeds of vehicles along a dangerous stretch of interstate follow a normal distribution with mean 50mph and...

• Replies: 2
• Views: 2,601
01-23-2006, 12:19 PM
52. ### Mean, standard error of mean

Bank officials claim that the average amount of money in savings accounts at all branches of the Commerce Bank is \$7500, with a standard deviation of...

• Replies: 4
• Views: 3,224
01-23-2006, 01:11 PM
53. ### give hyperstat to people and post hoc tests

Hi... I have a query regarding post hoc tests. When we carry out, say, a 2 way mixed anova and we come up with a significant interaction, how do...

• Replies: 2
• Views: 2,702
01-23-2006, 09:15 PM
54. ### New Student need help

Hi, I am a new student in statistics and any help will really appriciate. I am doing my assignment and one of the question was about level of...

• Replies: 2
• Views: 3,096
01-25-2006, 11:12 AM
55. ### Z score

I am having difficulty understanding the Z score. Its looks like that SD and Z score is doing the same function? Could you please explain with small...

• Replies: 2
• Views: 4,184
01-25-2006, 05:41 PM
56. ### Stanine calculation

Hey all, I have been trying to solve this problem without success, thus I'm calling for Help :( Problem: There are 103 Italian provinces ranked...

• Replies: 3
• Views: 6,414
01-29-2006, 12:28 PM

hello everyone! i m a pharmacy student in final year doing a project in analytical chemistry. i want to noe wht is confidence interval of 95% or...

• Replies: 1
• Views: 2,604
01-30-2006, 09:29 AM

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