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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: 196,556
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: 66,614
09-30-2005, 09:44 AM
1. ### Confidence Interval: Adjusted Wald Method

If I am conducting an experiment on 10 people and all 10 performed a task successfully, I want to know how to determine the confidence interval. I...

• Replies: 4
• Views: 16,725
12-12-2006, 04:59 PM
2. ### How to calculate log mean standard deviation of two numbers?

I have a journal paper which says they calculated coefficient of variations based on log mean average (LMA) values. Now, I know that log mean average...

• Replies: 0
• Views: 4,547
kpj
12-12-2006, 02:14 PM
3. ### Desparately need help

I have a stat problem that I need to get in by the end of the day and I have no clue how to start it! Here's the problem: During one of the...

• Replies: 0
• Views: 2,218
12-12-2006, 02:06 PM
4. ### Point me in the right direction?

Hi all, this is my first post here, so if I'm out of line or in the wrong spot, just let me know. Anyway, I've got a problem I could use some...

• Replies: 4
• Views: 2,629
12-12-2006, 02:01 PM
5. ### Group differences help

I am using a chi-square test to look for group differences in assessment use between four organizations bound by ethics codes. Some of the...

• Replies: 0
• Views: 1,868
12-12-2006, 01:48 PM
6. ### determining mean... help?

Im looking for the mean wage per employee per hour. info is as follows. hourly wage numbr of employees \$4.-4.50 ...

• Replies: 6
• Views: 2,670
12-12-2006, 01:44 PM
7. ### can anyone explain to me how to find p value from a printout?

I'm studying for my final and just can't seem to find this in the text. If anyone could help out that would be great. here is a sample problem ...

• Replies: 2
• Views: 5,021
ssd
12-12-2006, 01:29 PM
8. ### Frejection region using T?

not sure I understand this and any help would be great. One-Sample T test for VCR_price Null Hypothesis: MU = 215 Alternative hyp: MU > 215...

• Replies: 1
• Views: 2,154
ssd
12-12-2006, 01:20 PM
9. ### Do I have this right???

Here's the question... The nicotine content in cigarettes of a certain brand is normally distributed with a mean µ and a standard deviation σ = 0.1....

• Replies: 2
• Views: 2,832
ssd
12-12-2006, 01:16 PM
10. ### Help Me Please On The Normal Distribution!

I CAN'T DO IT TO SAVE MY LIFE!: The random varialbe x has the discrete uniform distribution over the set of consecutive intergers {-7, -6... 10}...

• Replies: 1
• Views: 1,847
ssd
12-12-2006, 01:03 PM
11. ### Statistics question

Can someone help with these questions: 4. In a survey, some of the questions concern sensitive issues (e.g., income, drug use, sexual...

• Replies: 2
• Views: 2,612
ssd
12-12-2006, 12:45 PM
12. ### ANCOVA Clarification

Hi Everyone, I'm doing simple effects analyses in SPSS with two IVs and a Covariate, by splitting the file for my first IV. I see...

• Replies: 0
• Views: 1,833
12-11-2006, 04:50 PM
13. ### Quartile Calculations

What is the correct way to calculate the quartiles? I know that it is more than just taking 25%, 50%, and 75%, but I don't recall the exact formula....

• Replies: 0
• Views: 3,562
12-11-2006, 04:44 PM
14. ### Please Help! (Sampling Distributions)

I'm struggling with these two problems, i'll really appreciate any help, thanks in advance = ) 1) Obtain the probablility, by counting, of each...

• Replies: 1
• Views: 2,867
12-11-2006, 01:00 AM
15. ### Regression Help

Hi everyone, Can someone help me with this problem? Is it potentially problematic to collect data in small groups of 3-6 people? What is the...

• Replies: 0
• Views: 1,870
12-10-2006, 06:13 PM
16. ### Two way or one way ANOVA

Subject No. Control Placebo Red Bull 1 29.9 28.8 29.56 2 28.5 29.94 28.36 3 34.92 35.41 34.9 4 31.91 31.6 31.42 5 34.92 34.8 34.04...

• Replies: 3
• Views: 2,320
12-10-2006, 03:46 PM
17. ### Trend Analysis Question

Hi There, I have a very quick question about trend analysis. I have a data set where there's two IVs: Drug and Task. Both variables...

• Replies: 1
• Views: 3,289
12-10-2006, 02:22 PM
18. ### End of semester assignment

4. According to the American Psychological Association, members with a doctorate and a full-time teaching appointment earn, on average, \$51,500 per...

• Replies: 0
• Views: 1,671
12-08-2006, 07:22 PM
19. ### errors

never mind

• Replies: 0
• Views: 1,948
12-08-2006, 07:00 AM
20. ### multiple questionnaire item chi square?

I have three questions: Question 1 I have a questionnaire (5 point Likert) and I want to compare student responses to 4 items. The 4 items...

• Replies: 2
• Views: 4,515
12-07-2006, 11:12 PM
21. ### Where do i start?

I am unsure where to begin on this problem and what formulas to use. here is the problem: the chamber of commerce of clarkston, wa was...

• Replies: 3
• Views: 2,772
12-07-2006, 08:42 PM
22. ### pls tell me if im correct with this answer

A medical researcher wishes to determine whether there is a difference in the mean systolic blood pressure of 40-year-old males and females. To...

• Replies: 1
• Views: 2,257
12-07-2006, 11:49 AM
23. ### level of significant. pls tell me if im correct

A training program for the operation of a piece of diagnostic equipment usually takes an average of 40 hours to complete. A new method of training...

• Replies: 1
• Views: 2,174
12-07-2006, 07:59 AM
24. ### Project Help

Hey all, I'm trying to determine how best to do a 95% confidence interval and a standard deviation around a best fit line. In this example, I...

• Replies: 0
• Views: 2,074
12-06-2006, 02:14 PM
25. ### Regression Equation

Hi there! I've got an equation and I don't even know where to start! The following table shows the body weight and gestation period of 12...

• Replies: 2
• Views: 2,762
12-06-2006, 01:05 PM
26. ### Bayes inference for comparing stock portfolios

I am working on an optimization problem to figure out which stock portfolio out of a large set of possible portfolios has the highest Sharpe ratio...

• Replies: 0
• Views: 1,750
12-06-2006, 03:07 AM
27. ### standard error from the mean - HELP!

I have all my standard error results but i do not have any idea how to interpret them... e.g. data set 1025 978 1332 mean = 1111.7...

• Replies: 0
• Views: 1,793
12-05-2006, 09:25 PM
28. ### Weak statistician here

We recently implemented a smoking ban and I am doing a paper on how it has affected bar/restaurant revenue. I surveyed 3 bars or restaurants in a...

• Replies: 2
• Views: 2,184
12-05-2006, 10:20 AM
29. ### Binomial random variable help

If X = a binomial random variable with parameters n and p, with 0<p<1 How do I show that P = P Also, how do I prove that as k goes from 0 to n,...

• Replies: 1
• Views: 3,022
12-04-2006, 07:29 PM
30. ### Help Pleasee

I. In a certain type of conspiracy, the probability of a conspirator "talking" is 0.05, and the conspiracy will be considered "blown open" if at...

• Replies: 1
• Views: 1,790
12-04-2006, 07:07 PM
31. ### Homework Help

:shakehead Hi my name is denise and I need a little help with these two problems.:rolleyes: Find the P-value for t greater than or less than...

• Replies: 1
• Views: 6,490
12-04-2006, 04:27 PM
32. ### Hypothesis test for population variance

I have a sample of 8 values, and need to test the null hypothesis sigma=25 against the alternative, sigma>25, where sigma is the population S.D....

• Replies: 2
• Views: 2,458
12-04-2006, 08:48 AM
33. ### coureswork help please

can someone please tell me what does a higher standard deviation mean? for example the suns standard deviation is 2 and the mirrors is 3 aswell what...

• Replies: 1
• Views: 1,620
12-04-2006, 06:59 AM
34. ### Statistics and Pure Mathematics.

Hi All. I very much passionate to build a bridge between some concepts of Statistics and Mathematics(in particular Pure Mathematics). Is there a...

• Replies: 0
• Views: 2,223
12-04-2006, 03:24 AM
35. ### Basic question about correlation

I'm trying to build an econometric model and have a basic question: Suppose corr(X,Y)=0.5 and corr(X,Z)=0.5, where X, Y, and Z are RVs. Is the...

• Replies: 1
• Views: 1,926
12-04-2006, 01:08 AM
36. ### problem with project, help please

whats up everyone? I'm stumped on this question in my project. I have the printout but have no idea where to begin to answer this question. ...

• Replies: 3
• Views: 2,053
12-03-2006, 11:38 PM
37. ### Help With Homework Problem Please

Hi, I've got this question that I'm unsure about how to approach. I was wondering if anyone could give me a hand or steer me in the right direction....

• Replies: 2
• Views: 2,297
12-03-2006, 09:29 PM
38. ### Uncertainty & confidence for pass/fail.

Say I am testing a single cylinder gasoline engine. Counter1 counts number of times a spark is sent to the cylinder. Counter2 counts number of...

• Replies: 0
• Views: 2,157
12-03-2006, 07:42 PM
39. ### Can anyone help me?

I have this statistics and inference worksheet that i cant get through. If anyone could email me i can email you the worksheet if you could help me. ...

• Replies: 0
• Views: 1,618
12-03-2006, 05:12 PM
40. ### Help with a project, not sure where to start >o<

Hi, I took a survey in which the data collected was non-numerical. For example, for most questions the options were either yes/no or...

• Replies: 2
• Views: 1,948
12-03-2006, 05:10 PM
41. ### Delphi study / 9 point Likert scales

We are conducting a Delphi study. Each statement in our questionnaire is scored on a nine point likert scale ranging from 1(strongly disagree) to...

• Replies: 3
• Views: 10,639
12-02-2006, 03:53 PM
42. ### Which test ?

Hi guys, I'm glad to find your site on the nest cause i have some statistical issues that a dumb doctor as me without a vast statiscal training...

• Replies: 0
• Views: 2,040
12-02-2006, 10:14 AM
43. ### How to test a moderator, with ordinal variables-newbie

Hello! I would appreciated if someone can help me, I'm a newbie in Statistics and research analyses. My questions are: - How do I test a...

• Replies: 1
• Views: 4,460
12-01-2006, 10:51 PM
44. ### 3SD Points

Hi Guys, Glad I found you, i am needing some advice. I havent used stats in I dont know how long but have been asked to provide a graph to 3SD. ...

• Replies: 6
• Views: 3,926
12-01-2006, 11:34 AM
45. ### Power in regression studies

Hi, can someone help me with an idiots guide to calculating power for a study using linear regression. I need power at .05 level and i have one IV,...

• Replies: 0
• Views: 1,842
11-30-2006, 08:37 AM
46. ### clustering test

Hi, I have many data points, which each point is a 2D coordinate. I need to find if these data points are significantly clustered or randomly...

• Replies: 1
• Views: 3,211
11-29-2006, 09:00 PM
47. ### mean and standard deviation

in a problem that gives you the mean and standard deviation for each variable, can you add the means together to get the total mean or standard...

• Replies: 1
• Views: 3,145
11-29-2006, 06:49 PM
48. ### sampling

If say an electricity company operates in 3 regions - A, B, C. A contains 40000, 80000, 80000 homes respectively. to company wants to estimate the...

• Replies: 5
• Views: 3,015
11-29-2006, 02:02 PM
49. ### Multivaiant Variances, need some direction.

Here is the question from a practice test we got today in AP Stats, 3. Cans of soft drinks cost \$.30 in a certain vending machine. What is the...

• Replies: 1
• Views: 4,972
11-29-2006, 01:47 PM
50. ### practice exam question

My teacher posted a practice exam, but we weren't able to go over it all in class. I was wondering if someone could help me with this problem. ...

• Replies: 0
• Views: 2,301
11-28-2006, 07:28 PM
51. ### Homework help...please

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

• Replies: 0
• Views: 1,892
11-28-2006, 06:37 PM
52. ### big study, little idea

I am trying to set up a statistical design for an experiment I am runnning in a greenhouse on defense mechanisms of plants to herbivory. ...

• Replies: 0
• Views: 1,652
11-28-2006, 10:35 AM
53. ### Chi square independence contigency table

The dean of instruction wanted to determine if the grade distribution was independent of the subject matter taught. The following table was...

• Replies: 2
• Views: 2,477
11-28-2006, 12:15 AM
54. ### Chi test distribution for goodness of fit, I think

Can someone please review this problem and let me know if I've chosen the right analysis? An elementary teacher is supposed to spend an equal amount...

• Replies: 2
• Views: 2,011
11-28-2006, 12:11 AM
55. ### Chi Square and Point Estimator

I have a quick question that I am lost on. I have a problem that included 16 random numbers of 13,11,25,3,16,7,14,10,13,22,16,5,18,24,21,and 16. ...

• Replies: 3
• Views: 2,395
11-27-2006, 11:44 PM

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