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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: 66,733
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: 196,719
07-16-2014, 11:01 AM
1. ### standard normal distribution help

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

• Replies: 1
• Views: 4,074
04-27-2006, 08:10 AM
2. ### 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: 3,876
04-27-2006, 11:42 AM
3. ### 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: 4,321
04-27-2006, 11:49 AM
4. ### 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: 1,946
04-27-2006, 12:57 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: 5,220
04-27-2006, 03:14 PM
6. ### 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: 1,952
04-27-2006, 08:13 PM
7. ### 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: 8,793
04-28-2006, 07:36 AM
8. ### 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: 3,634
04-29-2006, 10:01 AM
9. ### 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: 6,307
04-30-2006, 01:40 PM
10. ### how large the sample size should be?

Hi, I'm measuring electrical data from a clock generator and needs to know the std. dev. of period times (or frequency) for the lab report. I...

• Replies: 2
• Views: 2,478
05-01-2006, 02:33 AM
11. ### Analysis of correctness of answers

Hi! I have another question. My participants had to perform 32 tasks (8 tasks in all four conditions), and now I want to analyse whether there are...

• Replies: 1
• Views: 2,124
05-02-2006, 11:06 AM
12. ### Zscores and grouped data.

Hi, I have a set of data in the form of a frequency distribution. I have the class sizes and the corresponding frequencies but no access to the...

• Replies: 3
• Views: 2,679
mjc
05-04-2006, 10:17 AM
13. ### Fischer Table?

Hello all! I am currently working on a paper in finance. I have lost my statistics book. I would like to have a website with a Fischer table or...

• Replies: 7
• Views: 2,824
05-04-2006, 12:10 PM
14. ### Help with simple Confidence Interval Q

I just don't understand how to do these, I'm sure they are pretty simple. Any help would be greatly appreciated. A random sample of 120 passengers...

• Replies: 7
• Views: 2,316
05-04-2006, 01:24 PM
15. ### How to determine whether it is a good sample group and others

Hello, I have some questions. I am going to collect 60 samples for my study. The samples' moisture contents are between 20 - 80 % 1. What...

• Replies: 1
• Views: 1,485
05-04-2006, 02:38 PM
16. ### Distribution NOT normal :-(

I am conducting a repeated measure ANOVA and am testing the assumptions. My histograms are not showing a normal distribution for 2 of the 3...

• Replies: 1
• Views: 1,855
05-06-2006, 01:39 PM
17. ### Frequency Distribution & Polygons

Hi there, I just started a course in stats for the behavioral sciences, and I'm having trouble with one of my assignments. The assignment is to...

• Replies: 2
• Views: 2,080
05-06-2006, 04:39 PM
18. ### ANOVA help!

Can anyone help with the analyses of the ANOVA output from SPSS. My thesis ihas a two tailed hypothesis and the ANOVA has produced the F values and...

• Replies: 1
• Views: 1,962
05-07-2006, 08:14 AM
19. ### Help - questions re: Empirical Rule/Chebyshev

Hello: Does anyone know how to approach these problems? Any help would be greatly appreciated. The mean IQ of 200 patients in a psychiatric...

• Replies: 5
• Views: 8,401
05-08-2006, 08:34 AM
20. ### Kurtosis

Hi! In LISREL, which values are we to use when discussing kurtosis, z-values or statistical values? Also, what are the difference between them? ...

• Replies: 0
• Views: 3,293
05-09-2006, 04:50 AM
21. ### Two Sample T-Test With Unequal Variables

I need to perform an independent samples t-test with unequal variables on these two sample sets. There are 30 samples in each. So far, I've come up...

• Replies: 3
• Views: 3,969
05-09-2006, 10:29 AM
22. ### When to use Z scores or t scores?

Hi everyone, I have lots of trouble with Z scores and t scores........A lot of times we are given the standard deviation; however, the question...

• Replies: 3
• Views: 67,014
05-09-2006, 06:35 PM
23. ### Psych Stats - Help with Review Q'z

I just received a stats review sheet with tons of questions which I am suppose to do as exam review for my psych stats course and I have a few...

• Replies: 3
• Views: 3,857
05-09-2006, 08:08 PM
24. ### Type 1 error

10 10 Α= P(Type 1 error)= P(x≥6In=10, p1/3)= E C (1/3)x(2/3)^(10-6) X=6 x How...

• Replies: 4
• Views: 2,759
05-09-2006, 08:09 PM
25. ### Normal Distribution Curve

I just want to make sure I am getting this right. 0.0<z<2.85 .5000-.4978 =.0022 so I would shade in to the right of the curve. -1.38<z<0...

• Replies: 7
• Views: 7,322
05-10-2006, 11:24 AM
26. ### appropiate post hoc test

Hi May someone help me with this? I have done a 2 factor univariate ANOVA, although some of my data is not still normally distributed (Kolmogorov...

• Replies: 1
• Views: 3,301
05-10-2006, 03:38 PM
27. ### T-test and Z-test won't work

How can I solve this problem? X brand of batterys have a mean charge lasting time of 90 minutes and a standard deviation is 35 minutes but are not...

• Replies: 1
• Views: 2,722
05-11-2006, 09:14 AM
28. ### Trouble with Hypothesis testing (Psych. Stats)

I'm still really sketchy on hypothesis testing, even after reading the chapter in my book twice and watching the video lecture for this topic twice. ...

• Replies: 2
• Views: 2,750
05-11-2006, 03:56 PM
29. ### R value Anova

Hi all can someone tell me when we are assessing the significance vlaue in ANOVA, do we measure it against the adjusted R value provided at the...

• Replies: 8
• Views: 3,898
05-12-2006, 09:16 AM
30. ### Sample Size

Would like to learn the correct technique to caculate sample sizes. We are working with truck tires and determining the number of miles we get from...

• Replies: 4
• Views: 3,098
05-13-2006, 05:34 AM
31. ### What test do I use?

hi john i am trying to work out what inferential test i should use on my data. in brief my study involves looking at the effectiveness of a...

• Replies: 0
• Views: 2,247
05-13-2006, 05:59 AM
32. ### median test or 2 sample kolmogorov test ?

Hi I have the following problem: My data is generally non normal distributed and therefore I use the 2 sample Mann Whitney Test for comparisons. ...

• Replies: 0
• Views: 2,905
05-13-2006, 07:27 AM
33. ### Trying to fit normal dist. to quartile data

I have taken a test to get into graduate school and have scored a 160. The range of scores is 120 to 180. The school I have applied to has...

• Replies: 3
• Views: 3,038
05-13-2006, 10:35 AM
34. ### mean, mode, mediam

Hello, I have a question about mean, mode, and median is it possible to compute them using a date? example.. 29 Apr 2006 Thank you for your...

• Replies: 3
• Views: 2,901
05-13-2006, 10:38 PM
35. ### Determing Z score from level of confidence

How can I determine the Z score, given a level of confidence of 65%. My math book has the z score for .80, .90, .95, and .99 but none other. ...

• Replies: 1
• Views: 36,746
05-14-2006, 10:03 AM
36. ### Multivariate analysis for categorical dependent

Hi all, I have a question about multivariate analysis. I'm using SPSS 12. My dataset includes two variables, "cT_stage" (1,2,3,or 4) and...

• Replies: 1
• Views: 4,072
05-14-2006, 05:47 PM
37. ### Hypothesis Test Writing

I am trying to remember the correct way to write hypotheses, as I am a bit out of practice. I am conducting bivariate analysis on variables...

• Replies: 2
• Views: 2,157
05-14-2006, 06:16 PM
38. ### correlation question

I have a question regarding a simple correlation of estimated rather than known values. Let’s say I am interested in the correlation between A and...

• Replies: 1
• Views: 2,216
05-16-2006, 11:34 AM
39. ### Report Statistics

I need help finding a statistic that can be used on a daily production report I produce at work. Here's the info I have: Daily Budgeted/Expected...

• Replies: 2
• Views: 2,646
JDC
05-16-2006, 11:42 AM
40. ### continuous random variables

how would i compute the answer to the following question: Scores on a particular test are normally distributed in the population with a mean of...

• Replies: 1
• Views: 2,336
05-16-2006, 02:28 PM
41. ### stats terminology

hey can some confirm if my answers to this question is correct? thanks Classify the following variables as either quantitative or qualitative,...

• Replies: 1
• Views: 2,265
05-16-2006, 03:00 PM
42. ### f test!

In analysis of varience. whay we use mostly single tailed,one tailed f test.why dont we use the two tailed. and under which konditions we use the...

• Replies: 1
• Views: 1,902
05-16-2006, 06:53 PM
43. ### Homegeneity Tests

Hie, This question is regarding the assumption for ANOVA on having the variances equal for all populations. Have read that if this assumption is...

• Replies: 1
• Views: 1,879
05-16-2006, 07:21 PM
44. ### How to compare multiple groups with multiple covariates?

Hello, Suppose you have a data set comprising 10 cases of 3 classes and 15 features (no assumptions about the distribution of the 15 features). ...

• Replies: 2
• Views: 2,787
05-17-2006, 04:26 AM
45. ### binomial/hypothesis tests

hello for the following question i was able to answer part A and B but i dont know how to answer part C ...

• Replies: 1
• Views: 2,426
05-19-2006, 01:45 PM
46. ### probability distribution Q

A player rolls two dice and is awarded 1 point if the same number appears on the upface of both dice. If different numbers appear, he gets no points....

• Replies: 6
• Views: 2,965
05-19-2006, 10:10 PM
47. ### Correlation between groups

Hie, I would like to run correlation between my dependent (behaviors) and independent (stressors) variables. I have 10 variables for Behavior, and...

• Replies: 3
• Views: 2,399
05-20-2006, 08:01 AM
48. ### comparing likert data scores

Hi...I don't know why this question is so hard to find an answer on. I have a simple situation. I created a questionnaire with 6 point likert answers...

• Replies: 3
• Views: 6,783
05-21-2006, 02:07 PM
49. ### hypothesis tests

im really bad with these kind of questions regarding null/alternative hypotheses and the probability of them being true/rejected does any one have...

• Replies: 1
• Views: 2,187
05-21-2006, 03:10 PM
50. ### poisson distribution

hello there, I've been staring at this question for quite some time now but to no avail :( "The discrete random variable X has a truncated...

• Replies: 0
• Views: 1,703
05-21-2006, 03:41 PM
51. ### population proportions...

Hello, Suppose you have a problem to solve in which 71% of Internet users connect using standard telephone lines. The population proportion is...

• Replies: 3
• Views: 1,793
05-21-2006, 10:11 PM
52. ### Kind of embarrasing

Question A study discovered that that income of students is normally distributed, with an average annual income of \$17,500, and a standard deviation...

• Replies: 3
• Views: 2,771
05-22-2006, 05:44 AM
53. ### Can somebody check this one two

If the mean life of an aircraft engine part is 510 hours and the standard deviation is 30 hours, what percentage of parts lasts no more than 462...

• Replies: 4
• Views: 2,841
05-22-2006, 05:45 AM
54. ### determining mean without Z score

Hello, Not looking for the answer, I've just got myself confused. The scenario I have is: I have been given the Standard deviation figure 14.62...

• Replies: 4
• Views: 2,896
05-22-2006, 09:02 PM
55. ### textbook question

im having trouble with this question - i dont know how the textbook arrived at the answer of losing 1.3 cents per game on average A gambler...

• Replies: 3
• Views: 3,189
05-23-2006, 08:18 AM
56. ### z or t Argggggggg

Among trained typists, suppose the average typing speed on an electric typewriter is 60 words per minute (wpm), with a standard deviation of 5 wpm....

• Replies: 2
• Views: 1,862
05-23-2006, 08:27 AM
57. ### errors??

hi there!!:wave: i have a question!im completely getting confused, what is the difference between error term, error variance, experimetal...

• Replies: 0
• Views: 2,005
05-23-2006, 02:44 PM

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