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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: 197,273
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: 67,035
09-30-2005, 09:44 AM
1. ### Slope parameter info if intercept known?

Consider the SLR y = b +mx + e Where the intercept b is known. a) Find least squares estimator of m for this model. b) What's the variance...

• Replies: 8
• Views: 4,762
08-11-2012, 09:22 PM
2. ### type 1 and 2 error easy help please

Lifetime of a certain type of batteries is said to be Normally distributed with a known standard deviation of 5 hours. The manufacturer claims that...

• Replies: 8
• Views: 3,072
03-06-2012, 07:39 AM
3. ### Poisson Distribution problem again...

My question is: When studying cesium 137, it is found that during the course of decay over 365 days 1,000,000 radioactive atoms are reduced to...

• Replies: 8
• Views: 5,559
03-08-2012, 02:30 PM
4. ### Estimators from a Normal Distribution

Hi everybody. I have a random variable X normally distributed with mean mu and variance sigma squared. I generate two independent sample T1 and T2...

• Replies: 8
• Views: 3,692
05-02-2012, 05:37 PM
5. ### Immediate help needed with sampling

Don't need help anymore.

• Replies: 8
• Views: 2,253
03-13-2012, 08:25 PM
6. ### Analysis of soil fertility - Looking for guidance/confirmation

Hello, I have agreed to help a friend out with the data analysis for a major school project, with the caveat that I am no expert in statistics. It's...

• Replies: 8
• Views: 1,849
03-21-2012, 05:53 PM
7. ### use of the mann-whitney test

Hi I work at a university and am getting conflicting opinions between our statisitican and reviewer for a journal that i have submitted a paper to. ...

• Replies: 8
• Views: 6,063
04-22-2012, 04:50 AM
8. ### Confused with Homoscedasticity, PCA & AHC

Dear Colleagues, I need help with analysing my data. My data set consists of 66 different linear measurements taken per mouse skull. I have 66...

• Replies: 8
• Views: 2,998
05-16-2012, 11:09 AM
9. ### Find Equation from SPSS syntax?

Hi Does anyone know if there is a way to create the equation from the syntax used in SPSS? I know what I am doing, but haven't a clue about correct...

• Replies: 8
• Views: 3,227
07-17-2012, 05:01 AM
10. ### Likert scale

Hello all, I seriously need help on my research analysis. I am conducting a qualitative research with structured interviews i.e predetermined...

• Replies: 8
• Views: 4,980
07-21-2012, 03:16 AM
11. ### Is a random sample from a random sample a random sample?

Sorry for the confusing title. I have a population dataset with ~15million records from which I must produce a random sample of 100K records for a...

• Replies: 8
• Views: 2,682
08-01-2012, 04:56 PM
12. ### Is a paired T-test with one variable with all zero values valid?

Hi forumites, I have come across this situation where all the measured values for one of the variables are zero and the other has values ranging...

• Replies: 8
• Views: 7,089
08-05-2012, 09:54 PM
13. ### [Relation of daily sales] Chi-Square, T-Test or Correlation?

Hello, Which to use to test whether Monday sales and sales on the other days of the week are independent from each other. Case: A promotion...

• Replies: 8
• Views: 1,473
mba
09-25-2012, 08:26 PM
14. ### Favorite beginner textbook?

Sorry if this is repeat info; I am a newbie to the Forum. I did a quick search and did not see a similar question, so here goes: I am teaching a...

• Replies: 8
• Views: 1,768
09-27-2012, 12:54 PM
15. ### Percentile of SAMPLE mean

Can someone please explain to me how to work out the percentile of the sample mean (diff to confidence intervals which is pop mean) The Q is: ...

• Replies: 8
• Views: 16,838
09-20-2012, 04:52 AM
16. ### independent or paried t test?

the Census bureue believe that recently the ethnic composotion of a certain city has changed. 5 years ago there were 40% Asian, 22% Caucasian, 8% AA,...

• Replies: 8
• Views: 2,272
nyo
09-24-2012, 01:05 PM
17. ### central limit theorem and mean

Hi, I know that the central limit theorem states that as sample size increases the sampling distribution of the sample mean tends toward normal....

• Replies: 8
• Views: 2,024
09-30-2012, 04:28 PM
18. ### Conditional Multivariate Probability

So, I got this from my textbook and it makes sense: P_{Y|x}(y)= P(Y=y|X=x) = P_{X,Y}(x, y)/P_X(x) But I'm trying to apply it to this question...

• Replies: 8
• Views: 3,445
11-05-2012, 07:33 PM
19. ### Visualize and quantify factors that most contribute to customer decision

To the Direct Marketing department I have to to visualize and quantify the factors that most contribute to a customer’s decision to buy any group of...

• Replies: 8
• Views: 1,463
10-23-2012, 09:34 AM
20. ### Use of dummy in Plackett-Burmann screening

I am trying to set up an experiment for optimizing medium composition for bacterial growth using the Plackett-Burman design. I am planning to do a...

• Replies: 8
• Views: 5,125
08-13-2013, 12:55 AM
21. ### Anova or mixed model, and is non-orthogonality a problem?

Hello, I am trying to test whether the following variables affect likelihood of visits by squirrels to feeding stations: Distance of feeder...

• Replies: 8
• Views: 2,200
11-11-2012, 05:31 PM
22. ### Significance test for percentages

Hi everyone I need to compare percentage composition of different groups and determine if groups significantly differ. Example: Election...

• Replies: 8
• Views: 4,022
12-05-2012, 05:22 PM
23. ### Likert scale analysis

Hi. I have carried out a staff survey with about 30 questions grouped into a number of variables eg staff engagement, communication. I have done a...

• Replies: 8
• Views: 1,729
crm
12-11-2012, 05:51 PM
24. ### Standard Deviation of X Bar?

The population standard deviation= 1.7078 n=40 What is the standard deviation of x bar? Help! I keep using the formula: standard deviation of...

• Replies: 8
• Views: 5,384
04-11-2013, 08:19 PM
25. ### Simple effects- multiple comparisons adjustments necessary?

Hi guys, I cannot seem to figure out what the correct procedure is for simple effects analysis when decomposing interactions. So I have a...

• Replies: 8
• Views: 2,491
01-07-2013, 06:02 AM
26. ### interpreting a model after mean centering

hello, I have to choose the best way to model the relationship between years' experience and time taken to master a new skill. The curve seems to...

• Replies: 8
• Views: 2,424
01-09-2013, 01:26 PM
27. ### DOE for rock paper scissor analysis - suggestions for analysis needed!

Hi, I am in a design of experiments class at my university. We are analyzing rock-paper-scissor strategies and results among females and males on...

• Replies: 8
• Views: 1,704
03-05-2013, 06:02 PM
28. ### mixed effect: what should be modelled as random effect?

I'm trying to figure out what should be modelled as the random effect in a mixed effects model. I've made this toy data which shows exam scores of...

• Replies: 8
• Views: 1,668
04-24-2013, 03:30 PM
29. ### Can i do a t-test after Tukey post hoc?

Hello just wondering if this is acceptable or whether it's just gonna cause a type-1 error. I have used One-way ANOVA and then Tukey post hoc to...

• Replies: 8
• Views: 2,855
04-14-2013, 06:33 AM
30. ### [SOLVED] Increase variability

I have the need to take a variable that is normally distributed around 0 and the lower and upper bound is at -1 and 1. I need a transformation to...

• Replies: 8
• Views: 1,958
02-05-2013, 09:30 PM
31. ### statistical tests

Hi. I need you help, please!!!!! I have some data like this id a c t 1 1 1 1 2 1 1 0

• Replies: 8
• Views: 1,559
03-13-2013, 11:54 AM
32. ### Finding the p-value for two samples which are not normally distributed.

Hello, I am doing medical research and I have gathered data for two groups of patients with different characteristics. The data for each of the...

• Replies: 8
• Views: 2,548
02-21-2013, 10:01 PM
33. ### sketching distribution

I am taking a tutorial online and I ran into a quiz but I am totally new to stats..could someone help with the question below? Thank you very much in...

• Replies: 8
• Views: 1,958
02-21-2013, 12:40 PM
34. ### Any One Can Tell Me Desirable Properties of Interval Estimation ?????

• Replies: 8
• Views: 1,443
11-21-2013, 11:48 AM
35. ### Trouble with Calculating maximum Likelihood Estimate and Bayes Estimate

Hi, I solved this problem and just not sure if I can go even further. Suppose that X is a geometric random variable with density function ...

• Replies: 8
• Views: 2,673
03-14-2013, 04:37 PM
36. ### How to prove that a sample is statistically significant?

Hello, I've been searching all over the internet for a formula or a test that will help me understand if my sample (41 answers) is statistically...

• Replies: 8
• Views: 2,422
06-13-2013, 05:32 PM
37. ### Factor Analysis with perfectly correlated variables

Hi, FA#1: I ran a standard factor analysis in STATA (with varimax rotation) with 16 variables. Based on the Kaiser criteria I retain the 4...

• Replies: 8
• Views: 3,646
06-19-2013, 01:24 PM
38. ### Please have a look at my MLR Diagnostics

I've created two multiple linear regression models for two different continuous outcome variables. The diagnostics look acceptable to me. Outcome for...

• Replies: 8
• Views: 2,644
07-26-2013, 01:35 PM
39. ### Outliers and correlation

Hi all Im working on small size sample (17) . and need to do correlation for alot of prameters my questions is : -is removing the outliers is...

• Replies: 8
• Views: 2,848
08-02-2013, 06:08 AM
40. ### Variance Inflation Factor

Consider the linear model Y = B0 + B1X2 + B2X2 + e where the columns x1 and x2 of the design matrix have mean 0 and length 1. That is x1'x1 = 1 and...

• Replies: 8
• Views: 2,295
07-07-2013, 05:35 PM
41. ### Sampling Procedure Help Needed for Constructing a Confidence Interval

Hi all. Quick background: I am a 64 year old lady going back to college to get my Bachelor's. I haven't taken a college course in 30 years :shakehead...

• Replies: 8
• Views: 8,444
07-26-2013, 12:49 PM
42. ### ANOVA or Correlation?

Hi everyone, I'm researching foreign language classroom anxiety and with a 33-item 5-point likert scale and got stuck due to some discrepant...

• Replies: 8
• Views: 2,563
07-19-2013, 03:22 PM
43. ### Simple Statistics Review Questions. PART 2

So i have a review test on monday, and i'm trying to get through these review questions. Unfortunately i have no idea how to do some of these...

• Replies: 8
• Views: 2,118
08-25-2013, 01:43 PM
44. ### The role of beer in statistics

This is a test to see if Dason views this thread first.

• Replies: 8
• Views: 1,948
09-06-2013, 03:23 PM
45. ### Regression analysis data distribution

Hello colleagues, Could you please help me understand the following? I am making a linear regression analysis and my dependent variable is...

• Replies: 8
• Views: 2,107
10-19-2013, 04:00 AM
46. ### Correlations between dichotomous and continuous variables

Hello, I need to run a correlation in SPSS between two variables. One is a dichotomous variable (A). People have either answered the question...

• Replies: 8
• Views: 23,720
11-07-2013, 11:11 AM
47. ### Rayleigh estimator and correction factor

We're using the Rayleigh distribution for some real-world scenarios. We often need to estimate its parameter (sigma) from samples R of size N where...

• Replies: 8
• Views: 3,189
BGM
11-08-2013, 06:33 AM

Hello, guys. I was doing ok so far but I have no idea how to do this bit: Table 2: summary statistics indicating the % of drivers using hand-held...

• Replies: 8
• Views: 1,866
12-04-2013, 07:57 PM
49. ### testing for normality

I have a really elementary question, please for give me:- Of the following scenarios, when should parametric tests be used, and when shouldn't...

• Replies: 8
• Views: 1,448
12-26-2013, 03:58 PM
50. ### statistics help

i really need help with this assignment so far i have attempted this but i dont know if its right. my answers are: 1) 33.25% 2)25% 3) 0.0004...

• Replies: 8
• Views: 1,612
02-07-2014, 04:56 PM

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