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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: 196,951
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: 66,855
09-30-2005, 09:44 AM
1. ### Nominal/Ordinal scale variables and analysis

Hi, I’m a student in need of some help. I have developed a questionnaire with Likert type scales to measure the attitudes of employees in relation to...

• Replies: 1
• Views: 6,329
04-30-2006, 01:40 PM
2. ### Normality and ANOVA test

Hie, found this forum by chance and thought this forum is a good idea to help people with their analysis. Currently i am stuck in my data analysis...

• Replies: 6
• Views: 3,655
04-29-2006, 10:01 AM
3. ### Does it make sense to calculate a standard deviation from only three values?

I have sets of three values. Does the standard deviation make sense from only three values? Is there a minimum number of values that is recommended...

• Replies: 5
• Views: 8,835
04-28-2006, 07:36 AM
4. ### Confidence Int for shifted exp dist

herez the q: Let random variable X has shifted exponential distribution with density function given as follows: F(x, t) = { L exp (-L (x - @))...

• Replies: 0
• Views: 1,967
04-27-2006, 08:13 PM
5. ### What exactly is the p-value and the significance level?

Hi, I'm at the end of my first semester in statistics and we just finished confidence intervals and I'm completely overwhelmed. I have a take-home...

• Replies: 1
• Views: 5,248
04-27-2006, 03:14 PM
6. ### looking for someone to Critique HW

Can anyone look over my Home Work? Members of the watewishers club and their weights are: Al 243 bess 255 carl 255 delia 312 ebb 227 flo...

• Replies: 2
• Views: 1,957
04-27-2006, 12:57 PM
7. ### Evaluating RMSE for MLR models

On what basis does one evaluate the RMSE? When is it considered to be "too high?" It has been my understanding that in order to assess the...

• Replies: 1
• Views: 4,350
04-27-2006, 11:49 AM
8. ### r squared and t stats

I am running regression analysis of panel data examining whether there exists a relationship between aid and investment as well as between aid and...

• Replies: 2
• Views: 3,893
04-27-2006, 11:42 AM
9. ### standard normal distribution help

how do you do greater then problems doing this? we are using a chart.. chart is here.....

• Replies: 1
• Views: 4,110
04-27-2006, 08:10 AM
10. ### Help needed for Analysis on this complex project

Hello Friends, I have been working on this huge experiment (without a statistical background). It involved 28 participants divided into 4 Groups....

• Replies: 5
• Views: 2,090
04-26-2006, 08:22 PM
11. ### FACTOR ANALYSIS - POOLING data from different samples

I'm conducting an exploratory factor analysis to examine the factor structure of a translation of an established scale. There are 20 variables. I...

• Replies: 0
• Views: 2,874
04-26-2006, 06:14 AM
12. ### 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...

• Replies: 2
• Views: 2,630
04-25-2006, 08:52 AM
13. ### Unspoken ANOVA assumption

I heard that ANOVA does not like cells with small number of cases and that a small number could throw off results--and that the number is unspeicifed...

• Replies: 3
• Views: 2,230
04-25-2006, 07:52 AM
14. ### Statistical analysis for likert type scale

Hey, please help! I am currently analysing data from a likert scale, descriptive stats not a problem, it is the inferential stats im having a problem...

• Replies: 6
• Views: 16,166
04-24-2006, 08:27 PM
15. ### Urgent!

I found this post by Orangeb and its exactly the same quiz Im working on. Could anyone help Orangeb and I on this one? We both would be greatful and...

• Replies: 1
• Views: 1,756
04-24-2006, 06:19 PM
16. ### How do I do this>?

How do I attempt or solve a question like this? Can someone solve it and expalin it to me as a roadmap to other problems that plague me? here it...

• Replies: 4
• Views: 2,285
04-24-2006, 10:12 AM
17. ### Stats help

Insurance industry analysts report that the average amount of life insurance in effect in Virginia is \$92,500 with a sample standard deviation of...

• Replies: 1
• Views: 1,591
04-23-2006, 07:43 PM
18. ### Grouping by the dependent variable

Why should one NOT group by the dependent variable in a regression context?

• Replies: 1
• Views: 2,512
04-23-2006, 07:31 PM
19. ### Control Variate for normal r.v.

Hello! I would like to know what is the best/natural choice for the control variate of a normal (gaussian) random variable. Thank you.

• Replies: 2
• Views: 1,900
04-23-2006, 05:15 PM
20. ### least-squares prediction

A sociologist beleives that there is a tendency for tall men to marry tall women. To determine the nature of such a relationship, the heights of the...

• Replies: 0
• Views: 2,708
04-23-2006, 01:41 PM
21. ### null and alternate hypotheses

His agent claims that the average speed of a fastball thrown by pitcher Moe M. Down is 90 mph. If the average speed of 64 randomly selected...

• Replies: 1
• Views: 2,191
04-23-2006, 01:18 PM
22. ### Confirmatory factor analysis

Hi, does anyone here knows a good website that explains how to perform a confirmatory factor analysis with AMOS? Thank you, Hans

• Replies: 0
• Views: 2,498
04-23-2006, 03:18 AM
23. ### Help

I need help with answering this question: The average hourly pay of medical typists in a large city if \$15.00 with a standard deviation of \$2.80....

• Replies: 1
• Views: 1,782
04-22-2006, 11:09 PM
24. ### Sample size and Power

Hi I am interested in finding out the how to determine what sample size I need for a survey and how that is related to effect and power. Also,...

• Replies: 3
• Views: 2,988
04-21-2006, 02:33 PM
25. ### chi square with 0 votes in cells

Hi! I want to analyze votes for any significant preferencies. My tables look like this: A - 12 B - 8 C- 0 D - 10 Now, the expected frequency is...

• Replies: 2
• Views: 2,824
04-21-2006, 08:09 AM
26. ### What test to use?

I have a continuous dependent variable and an ordinal variable. I've found tests for 2 ordinal (Kendall's, Gamma), but what do I do in this case?...

• Replies: 1
• Views: 2,200
04-20-2006, 07:35 AM
27. ### least regression

I am a student taking basic stats and I am not sure if I arrived at the correct answer for these could someone please let me know. Consider the...

• Replies: 0
• Views: 1,667
04-19-2006, 05:31 PM
28. ### How to convert a table of probabilities to j.p.d.f

Among the sudent that attempted the exams of Calculus III (CIII) and Differential Equation (DE) is oberved that the joint probability of passing or...

• Replies: 0
• Views: 2,326
04-19-2006, 05:08 PM
29. ### Need help with hypothesis testing problems

Microsoft believes that if over 30% of Linux users would be interested in a particular new software package, then the company will make at least an...

• Replies: 0
• Views: 2,126
04-19-2006, 02:36 PM
30. ### Any suggestions??

I am working on a project to construct and report results of a regression model, but I am stuck on trying to find an idea to construct. I originally...

• Replies: 3
• Views: 2,441
04-19-2006, 09:59 AM
31. ### confounded by confounders

I chose numbers of new patients and numbers of pediatric patients as confounders for a survey of practices used in dialysis facilities. Now that I'm...

• Replies: 5
• Views: 2,849
04-18-2006, 07:51 AM
32. ### Construct validity check problems

Hi, First time user here. Thanks for puttting up this forum! :tup: Background: I am writing about factors that affect the adoption of IT. ...

• Replies: 5
• Views: 3,642
04-17-2006, 08:18 PM
33. ### level of significance test with no standard deviation

Hi, one question...been doing one and two tailed tests of level of significance but have a problem without a standard deviation...How do I proceed...

• Replies: 1
• Views: 7,302
04-14-2006, 02:10 PM
34. ### Likert analysis & survey - help!

Hi, Pls help. Textbooks on this topic is making me nuts :( I have a 20 qn survey looking at people perceptions on 'perceived unfairness' about an...

• Replies: 6
• Views: 3,341
04-14-2006, 11:41 AM
35. ### non parametric stepwise regression

Anyone know of a nonparametric version for stepwise regression?

• Replies: 1
• Views: 2,911
04-13-2006, 07:30 PM
36. ### Are weighted means appropriate?

Hi- I am looking for information about weighted means. Are they appropriate to use when sample sizes are unequal? I am measuring plant roots- some...

• Replies: 4
• Views: 2,786
04-12-2006, 08:42 AM
37. ### confused again...

dear friends here i am again. My new query is this: i have one group of patients to be treated in a new position with ESWL: 19 obese patients with...

• Replies: 3
• Views: 1,914
tdk
04-12-2006, 12:57 AM

ok stats question.... in a recent survey of 500 high school students, 334 said that if they found \$1,000 behind a bush at school they would keep the...

• Replies: 1
• Views: 1,926
04-11-2006, 12:08 PM
39. ### survey and "other" responses

If a survey question offered 2 choices plus "other," when converting to variables, would this be dichotomous or nominal? (The data is not continuous,...

• Replies: 1
• Views: 2,225
04-11-2006, 07:57 AM
40. ### Mean and Standard Deviation-due tomorrow

The amount of time a Lakemore Statistics student spends on homework each evening is approximately normally distributed. If 22% of the 75 students...

• Replies: 1
• Views: 2,724
04-10-2006, 11:10 PM
41. ### Hypergeometric distribution question

I have a homework question on capture/recapture without replacement. I'm really struggling answering the question and hope someone can help. ...

• Replies: 4
• Views: 4,022
04-10-2006, 10:15 AM
42. ### normal distribution questions--am I on the right path

hi...just checking to see if I am on the right track on these problems. here is what I have: in a normal distribution with u =200 and r=30, find...

• Replies: 1
• Views: 2,384
04-10-2006, 10:01 AM
43. ### Using a TI-84

Can you show me how to graph a histogram in the calculator:p And how to program the equations that are needed into the calculator for use on the...

• Replies: 3
• Views: 4,924
04-10-2006, 09:53 AM
44. ### Can percent be a "continuous" variable?

I got percentages of lab tests meeting a desirable target range. I want to use the percentages as scores (higher the better) and compare them to...

• Replies: 1
• Views: 4,554
04-10-2006, 07:28 AM
45. ### simple correlation question

Dear all, I have a very simple and may be silly question about correlation. When we want to correlate two sets of scores is it necessary that the...

• Replies: 1
• Views: 2,158
04-09-2006, 02:25 PM
46. ### Can you check my homework it is due 4/5/06 at 10 a.m. Eastern

:yup: Holiday Spending. "How much do you plan to spend for gifts this holiday season?" An interviewer asks this question of 250 customers at a...

• Replies: 2
• Views: 5,075
04-07-2006, 10:47 AM
47. ### Meaning of p

Hi everyone need a bit of help. From my knowledge the p value is the chance that the null hypothesis is true so if p=0.05 then there is only a 5%...

• Replies: 1
• Views: 3,219
04-06-2006, 07:33 PM
48. ### Post Hoc tests - significant interaction

I'm involved in a student project that is investigating the effects of anticipation on the magnitude of the reflex muscle activity in the arm. I have...

• Replies: 0
• Views: 2,347
04-06-2006, 03:11 PM
49. ### Need Help Urgently

Hey guys I need help in an assignment it is due tonight, and i am clueless about what to do the assignment is here...

• Replies: 0
• Views: 2,143
04-06-2006, 01:39 PM
50. ### Newbie Here! Question on find number of test...

This is a three part question where we are given a set of data samples. coupon tip1 tip2 1 47 ...

• Replies: 1
• Views: 4,257
04-05-2006, 10:43 PM
51. ### datasets finding

Hi, my first time on this forum, I will soon do a project on ANOVA and we need to design ANOVA models with 3 factors or more, can anyone provide me...

• Replies: 2
• Views: 2,200
04-05-2006, 07:09 PM
52. ### Hypothesis testing for populations?

I was hoping someone could help me out with the following issue. I am accustomed to performing t-tests on two samples to determine if there is a...

• Replies: 2
• Views: 2,232
04-05-2006, 02:06 PM
53. ### Example Questions for a Final

Do you have any example questions for a comprehensive final? If, so please e-mail them my final is on May 8, 06. Thanks in advance Shonna

• Replies: 0
• Views: 1,987
04-04-2006, 03:45 PM
54. ### Please check homework problem #2

:confused: Coaching and the SAT. Suppose that SAT mathematics scores in the absence of coaching vary Normally with mean mule=475 and standard...

• Replies: 0
• Views: 4,152
04-04-2006, 03:25 PM
55. ### Can't seem to figure this out... any help?

"A shopping center developer claims in a presentation to a potential client that at least 40% of the adult female population in a community visit the...

• Replies: 0
• Views: 2,113
04-04-2006, 01:51 PM
56. ### Normal Distributions

ok, I have this one problem that I cannot figure out for the life of me. It's probably really simple, but I really just can't figure it out. Any...

• Replies: 0
• Views: 2,849
04-03-2006, 11:35 PM
57. ### P-value method

I have a couple of questions I would like to know if I am doing them correctly or not, any guidence would be greatly appreciated. Test the given...

• Replies: 0
• Views: 5,943
04-02-2006, 10:25 PM
58. ### Significance level in r (correlation coefficient)

Hi John: I am going Pearson correlation analyses, first in overall sample, and then I divided them into three strata or groups. r is significant...

• Replies: 1
• Views: 5,307
04-02-2006, 11:20 AM
59. ### Another Hypothesis Question

OK...pls give me an idea where to start this one...I want to learn the steps, not be given the answer...I'm not looking for charity, just lost in...

• Replies: 2
• Views: 2,062
04-02-2006, 10:43 AM
60. ### Q about % contribution

hi, I want to ask: why do we use 'Sum of Squares' in compting percent contribution and not 'effect estimate'??? :confused: thanks for help!!...

• Replies: 1
• Views: 1,909
04-02-2006, 10:09 AM

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