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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: 66,761
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: 196,763
07-16-2014, 11:01 AM
1. ### Finding the time-to-failure of a lightbulb?

How would I find the time-to-failure of a lightbulb with a z-score of 1.25? I'm not sure what formula I would use... I'm also given the mean, the...

• Replies: 0
• Views: 1,208
11-15-2012, 10:16 PM
2. ### Basic question

Suppose you had a pile of 120 million red and blue jelly beans where 20 out of every 100,000 of them were red jelly beans. And suppose you moved ten...

• Replies: 2
• Views: 1,119
07-23-2015, 08:49 PM
3. ### How to Calculate p-value of Grade Averages

I have average test scores for two populations: male and female. The average score for females is 92. The average score for males is 89. Given...

• Replies: 11
• Views: 5,207
07-05-2013, 03:05 PM
4. ### P-value: 2 populations (not samples) - different sizes

Is it possible to compute the p-value when the data I have is for two populations, rather than samples? Additionally, the population sizes are not...

• Replies: 6
• Views: 2,449
10-15-2013, 04:14 PM
5. ### Variables which sum to a constant - ANOVA, MANOVA or none of the above?

Help with the following dilemma would be much appreciated: I asked a group of subjects to make a series of 12 binary choices regarding...

• Replies: 3
• Views: 2,224
06-06-2012, 06:43 PM
6. ### Confidence Intervals

Let p1 and p2 be the respective proportions of women with nutritional anemia in each of two developing countries. If a random sample of 250 women...

• Replies: 0
• Views: 1,541
01-28-2015, 08:11 PM
7. ### statistics problem

Hello :wave: Could you please help me with this problem on statistics? Thanks so much :):) It has been suggested that showing the face of the...

• Replies: 2
• Views: 2,578
10-24-2009, 05:30 PM
8. ### two-sample K-S test for repeated measurement

Hello everyone, I would like to know if there is an analog to the 2 samples Kolmogorov-Smirnov test when each sample is composed of repeated...

• Replies: 0
• Views: 2,741
12-01-2008, 11:44 AM
9. ### Comparing groups - z-scores

I have two groups A and B. Each subject has provided scores on a number of tests, and I want to give each subject an overall score based on these...

• Replies: 2
• Views: 7,664
08-16-2006, 11:59 AM
10. ### Floor Effects

Hi! I want to compare two groups on an accuracy measure (measured as a %). I have assessed the ditribution of scores for each groups, and while...

• Replies: 2
• Views: 5,673
09-21-2006, 05:13 AM
11. ### Two-Way ANOVA without raw scores

Hey, I need to be able to perform a two-way ANOVA without raw data - i.e. with only means, standard deviations and sample sizes available. ...

• Replies: 4
• Views: 7,752
07-26-2008, 01:28 PM
12. ### One-way ANOVA homework help

My teacher asked the following (and the first part of my answer is included): 1. We are interested whether Motivation (mot) is different among...

• Replies: 10
• Views: 3,235
12-02-2011, 06:17 PM
13. ### effect size question

I'm trying to find the effect size for an independent samples t-test with unequal groups sizes. n1- 506, X1- 51.45, s1- 9.578 n2- 94, X2- 54.01,...

• Replies: 5
• Views: 2,546
11-16-2011, 09:44 PM
14. ### MANOVA question regarding writing up main effects

My professor had us run main effects of MANOVA in two different orders in order for us to understand the impact of ordering variables. In this...

• Replies: 2
• Views: 1,701
03-04-2013, 01:23 PM
15. ### SPSS output problem

Hello, I'm doing a university assignment where we've received a certain SPSS output and we have to write a report on it (including results...

• Replies: 2
• Views: 1,227
01-03-2015, 05:18 AM
16. ### three-way anova help please!

hi! i'm currently performing a practical in R requiring 3-way fixed effects ANOVA for my maths degree. There are 2 quantitative factors -...

• Replies: 4
• Views: 3,218
03-05-2006, 04:21 PM
17. ### logistic regression for comparison of two gropus

Is it okay to use logistic regression to compare a variable between two groups? (as a non-parametric alternative to t-test when its assumptions are...

• Replies: 7
• Views: 8,627
05-21-2011, 01:57 AM
18. ### H0: μ≥18.1 ,H1: μ<18.1, x̄ = 16.8 , s = 4.7?

Given that level of significance is 0.1, how do I A)find sample size( not sure if i need to find this but i think i do,im really confused on how...

• Replies: 1
• Views: 31,224
07-21-2010, 03:28 PM
19. ### Hypothesis testing

I have an assignment due in a little while and I would like to double check my answers... it's basically true and false of m/c 1. The probability...

• Replies: 1
• Views: 3,564
11-01-2006, 07:55 PM

:confused: i've just started studing statistics and i want to use the chebychev's therorm, however i'm not sure how can i find the value of the...

• Replies: 1
• Views: 2,319
08-27-2006, 12:21 PM
21. ### Interpreting an unstandardized partial regression coefficient

Hi, anyone know what two equivalent interpretations of the below unstandardized partial regression is? Y^MathsValue = -7.31-0.27XAnxiety +...

• Replies: 0
• Views: 2,986
04-04-2013, 06:32 AM
22. ### Why does a larger sample size produce a smaller p-value?

Hi, I need help with this problem... The obtained p value for a correlation analysis is .036, for a sample size is 50. If the analysis had been...

• Replies: 2
• Views: 5,140
04-05-2013, 05:55 AM
23. ### How to interpret a standardized multiple regression coefficient

How can I write an interpretation of the standardized multiple regression equation for both Age of Child and Number of Siblings in this model: ...

• Replies: 4
• Views: 36,577
04-05-2013, 09:34 PM
24. ### Is this question as simple as it seems?

Fluorescent light tubes used by a firm have a target life of 1600 hours. However, accumulated data shows a mean time to failure of 1570 hours. What...

• Replies: 8
• Views: 2,048
04-28-2011, 01:06 AM
25. ### Two-way ANOVA with or without replication?

The logistics department of a large firm employs three “estimators” whose job it is to decide the likely cost of delivering their products to their...

• Replies: 0
• Views: 8,041
04-29-2011, 02:02 PM
26. ### Paramaetric and Nonparametric Data

I NEED help big time! I have been reading and reading forever and I just can't grasp the difference in the two. I have a matching assignment that is...

• Replies: 0
• Views: 1,950
08-10-2007, 01:58 PM
27. ### Random sampling

Hi, I have a querie about methods of random sampling. I need to do an audit of patient records over a 3 month period. However, the number of...

• Replies: 2
• Views: 2,219
01-26-2010, 10:22 AM
28. ### Normal Distribution

A set of reading scores for fourth-grade children has a mean of 25 and a standard deviation of 5. A set of scores for sixth-grade children has a mean...

• Replies: 1
• Views: 4,988
10-25-2006, 08:44 PM
29. ### How to deal with bimodal distributions in SPSS?

I ran a psychology study in which kids watched 1 of 4 cartoons, and then performed 3 tasks. On one of the tasks, I obtained a bimodal distribution. I...

• Replies: 4
• Views: 16,994
07-28-2012, 05:12 PM
30. ### Distribution of fitted values

I need to find/show the distribution of the fitted values of y^=μ^ I'm not even sure where to start with this.

• Replies: 1
• Views: 1,129
11-26-2012, 04:09 PM
31. ### Assistance - ANOVA

Hello All - I'm struggling with my Psychology homework. I have to work out MS within, but I'm not sure how to do it. I know that the calculate MS...

• Replies: 0
• Views: 1,692
08-11-2010, 03:59 AM
32. ### STATISTICS EASY PROBLEM help

how many ways can you arrange a 3 digit number if first number cant be 0 and no numbers can be repeated. My guess is 9*8*7 which equals 504. BUT...

• Replies: 2
• Views: 197
10-08-2017, 08:36 PM
33. ### demonstrate that 3 sequences are equally likely to occur when tossing a coin 10 times

Hi, I am in an intro to stats class and I am totally lost. Please explain as I said I have no idea what to do. Thanks for your help in advance! ...

• Replies: 0
• Views: 1,425
02-08-2017, 07:38 PM
34. ### Spearmans or Pearsons.....???

Hello, I am have very last minute dissertation panic. My dissertation is done, except I dont know which results section to use... the one using...

• Replies: 2
• Views: 2,577
04-19-2010, 11:16 AM
35. ### Homework Help

The problem is: Consider the experiment of tossing two dice. Let Y denote the absolute difference of the upturned faces. A) Find the mean and...

• Replies: 3
• Views: 1,154
02-15-2013, 09:55 PM
36. ### Exploratory Data Analysis

Hey guys, I'm a post-graduate university student and for one of my classes I have to undertake an EDA of the following data... I have 20 sets...

• Replies: 5
• Views: 2,181
08-15-2012, 07:30 PM
37. ### Statistical error

Hi! I just need someone to quickly confirm/correct: I ran a survey and managed to get 3540 responses, i.e. people to respond. My sample size is...

• Replies: 0
• Views: 505
01-23-2014, 07:21 AM
38. ### some help with this null/alternative hypothesis. i tried & my professor says im wrong

This is the problem: Are people who got arrested in NYC in 1989 for the first time younger, on average, than people who are getting arrested more...

• Replies: 2
• Views: 2,886
05-23-2011, 11:28 AM
39. ### jaccard similarity coeff's and lots of zeros...

I am trying demonstrate that jaccard similarity coefficients for fungal species between different combinations of trees are different. I believe I...

• Replies: 0
• Views: 2,597
10-29-2008, 05:20 PM
40. ### URGENT Help with Regression Interpretation

Hi guys, i know this is my first post. i need help urgently with interpreting regression test which i have conducted. i cant figure out how to check...

• Replies: 5
• Views: 3,342
09-23-2008, 08:31 PM
41. ### Computing Power

I know that power is one minus beta...but how do you calculate beta?

• Replies: 15
• Views: 7,259
10-12-2005, 11:25 PM
42. ### 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: 10,385
12-06-2005, 11:17 PM
43. ### Calculating conf intervals from a function of other variables

Hello, I am analyzing some biochemistry kinetics data, and am trying to determine the confidence interval for a calculated parameter. I would be...

• Replies: 1
• Views: 2,227
01-02-2008, 03:08 PM
44. ### Permutations

I was asked, how many number of combinations of five digit number followed by three letters. The numbers have to be first and letters in the end....

• Replies: 1
• Views: 734
BGM
01-30-2014, 11:59 PM
45. ### Working with size 'range'

Hi all, Firstly I appreciate this might be a really simple question so I apologise! I have raw data of Size and Frequency (size of fish, number...

• Replies: 0
• Views: 1,574
04-05-2009, 09:41 PM
46. ### how to check if data has the pareto distribution

I have about 40 data and I want to know if they have pareto distribution or no. I tried SPSS 19 but I couldn't do that. and I'm going to do it by R...

• Replies: 1
• Views: 4,600
06-13-2011, 02:22 PM
47. ### Urgent: Multiple Regression Hat Matrix Proof

Hi all, Quick question for you: How would I go about proving that var(y-hat) = sigma^2 * H (H is the hat matrix) Thanks for any help! ...

• Replies: 4
• Views: 6,284
03-31-2011, 06:51 PM
48. ### Really silly question...

post deleted

• Replies: 0
• Views: 2,534
03-05-2011, 11:48 AM
49. ### Binomial response variable with 3 continuous and 1 categorical predictor. Best test?

Hello I have a binomial response variable. Predictors are composed of 3 continuous variables (the results of a Principle Components Analysis of...

• Replies: 1
• Views: 1,652
11-01-2014, 09:51 AM
50. ### Correct way to dispaly the fixed effects of a mixed effects model

I have a question regarding crating a graph displaying the fixed effects of a mixed effects model that I cannot seem to find an answer to. I am not...

• Replies: 0
• Views: 1,243
11-03-2014, 11:41 AM
51. ### time series - ARIMA + ARIMAX + R

Hello, I am not a statistician, a machine learning computer science person. Recently, have read quite a bit about ARIMA and ARIMAX and using them in...

• Replies: 1
• Views: 3,164
12-29-2016, 01:42 PM
52. ### Question about choosing the right test

Since I have no experience in statistics, I need the advice about how to choose the test that I could apply for the following analysis: there are 16...

• Replies: 0
• Views: 1,183
07-15-2012, 04:42 AM
53. ### Contingency Table Disaster

• Replies: 3
• Views: 1,954
01-14-2015, 11:22 AM
54. ### Gold Standard vs. New Technology

• Replies: 7
• Views: 2,352
01-16-2015, 03:52 PM
55. ### Is there ANOVA way?

• Replies: 1
• Views: 1,547
01-16-2015, 12:55 PM
56. ### Interaction term in regression question

Hi, first time user. I am having trouble with a question and I just wanted some hints/pointers as to how to solve it. Suppose you have a dependent...

• Replies: 0
• Views: 2,733
04-20-2010, 11:00 PM
57. ### What is seasonality and how is it defined?

Let's say that I have a univariate dataset pertaining to sales and people claim that the sales numbers follow a seasonal pattern. I get that when...

• Replies: 5
• Views: 2,922
01-22-2015, 12:24 PM

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