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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: 200,384
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: 68,589
09-30-2005, 09:44 AM
1. ### Help with homework

On a homework assignment, I have a data set with the variables (in SPSS) 1) Age 2) Reactiontime (continuous) 3) drug (Placebo, or drug...

• Replies: 0
• Views: 1,030
10-02-2016, 01:28 PM
2. ### How to prove the magnitude of improvement (two data sets)?

Hi Guys! I am struggling a bit with some statistical validations. Currently using Google Analytics in order to get data from my website. Testing...

• Replies: 2
• Views: 1,180
10-02-2016, 10:36 AM
3. ### question about data description

Dear forum members, I have a tibble called smoke, containing 300 rows (one row for each subject) and two variables (group and race.) Group takes...

• Replies: 1
• Views: 1,277
10-02-2016, 01:23 AM
4. ### Bionomial Probability Distributions

51% of men consider themselves professional baseball fans. You randomly select 10 men and ask each if he considers himself a professional baseball...

• Replies: 5
• Views: 3,357
10-01-2016, 04:14 PM
5. ### Am I interpreting this correctly?

I have a continuous DV and 2 categorical + 1 continuous IVs. In spss I did a univariate analysis and found a main effect of one of the categorical...

• Replies: 0
• Views: 1,213
09-30-2016, 07:21 PM
6. ### Binomial Distribution : Probability equation solution

Question :In a binomial distribution for p=.48, q=1-p=.52 find the population size n1 so that P(X>=3)=.95 My solution : P(X>=3)=.95 can be...

• Replies: 2
• Views: 1,657
09-30-2016, 12:03 AM
7. ### Why do we take normal samples?

Hey everyone!I have a problem on understanding on an intuitively level some things in statistics and therefore I wish that you could help me.My...

• Replies: 1
• Views: 1,449
09-29-2016, 01:17 PM
8. ### Binomial distribution problem

I'm having trouble setting up this problem. Any help would be appreciated. Here's the question: If the number of defective items selected at...

• Replies: 1
• Views: 2,918
09-29-2016, 06:30 AM
9. ### Testing for significance: Disease Prevalence vs Disease Severity

Hi Folks, This is my first post and low and behold, it's a help request. I am a relative stats beginner and I have been searching the net for...

• Replies: 6
• Views: 1,871
09-28-2016, 12:07 PM
10. ### Statistics Distribution

Hey all, I have a question that I am not sure how to solve. The firm Colddrinks produces a new kind of orange juice in bottles with label...

• Replies: 0
• Views: 1,040
09-26-2016, 05:15 PM
11. ### Calculating probabilities over time?

Hello, I'm looking to learn how to calculate probability of an event happening over time. The easiest way to express it is in a dice analogy. I...

• Replies: 1
• Views: 1,263
09-26-2016, 01:48 PM
12. ### Generating rates: individual level or aggregate??

Using approach 1; the average number of infraction per 100 days is 0.7 and option 2 ((7/175)*100)=0.9

• Replies: 0
• Views: 1,361
09-26-2016, 01:18 PM
13. ### Repeated measures anova?

Hey guys i am struggling to decide on the correct test I should run for the following design: I am comparing one treatment and one control...

• Replies: 5
• Views: 2,422
09-26-2016, 12:01 PM
14. ### Need Help Understanding Calculation of Printed Circuit Board Design Time

First post here. If it's not appropriate or needs moved, I apologize. FWIW, this is not a homework problem... I'm in need some help understanding...

• Replies: 3
• Views: 2,398
09-26-2016, 09:39 AM
15. ### Sampling.

Suppose any body interested to take up a study on healthcare utilization by differently able person, say he/she has resources for sample of size 100...

• Replies: 1
• Views: 1,739
09-26-2016, 08:44 AM
16. ### Function output difference

I have two 'unknown' functions that I need to test the check if there is any difference in their outputs. In the easiest case the output is...

• Replies: 0
• Views: 1,008
09-26-2016, 06:31 AM
17. ### Question regarding conditional probability. Did I get this correct when explaining?

Hello, I'm constantly getting my conversations marked off because I'm not writing exactly what the teacher wants. Here is the question that was...

• Replies: 1
• Views: 1,960
09-24-2016, 05:52 PM
18. ### Can Variance be used as an output variable?

For example, in an experiment the output data (y axis) becomes more dispersed as some input variable (x axis) is changed. So if there seems to be a...

• Replies: 6
• Views: 1,587
09-24-2016, 10:52 AM
19. ### Good source for post hoc test selection?

Hi all - How do I select the most appropriate post hoc (post ANOVA) test? It's data from a normal distribution, 4 groups, experimental data from...

• Replies: 0
• Views: 1,172
09-23-2016, 11:21 AM
20. ### Best statistics textbooks to read to tackle this type of exam?

The prescribed textbook we use is our course at ANU is Keller, I have read the book and did most of the end of chapter questions. But the lecturer...

• Replies: 2
• Views: 1,428
09-22-2016, 05:52 PM
21. ### Is Paired T-test the right tool to use?

Hi! I want to know whether the paired t-test can be used when the variables for comparison are different (but measuring similar constructs and on...

• Replies: 1
• Views: 1,618
09-21-2016, 10:58 PM
22. ### Help with Correlation

Hello! I need help for an issue i have. Let's assume that we have data of two variables (X and Y) for 14 different people. We can find the...

• Replies: 10
• Views: 1,743
09-21-2016, 06:26 PM
23. ### Understanding: Mean Square Treatments ~ Mean Square Error If Null Hypothesis is True

I am having difficulty understanding how the Mean Square Treatments should be approximately the same as the Mean Square Error if the null hypothesis...

• Replies: 0
• Views: 1,194
09-21-2016, 09:12 AM
24. ### HELP! Manipulation of a survey question to a Value

I got a result of survey asking "What percentage of banking applications are designed for mobile access today? where the answers can be -Under 5%,...

• Replies: 0
• Views: 1,035
09-21-2016, 01:49 AM
25. ### Central tendency in stattistic:

If anyone want to calculate or estimate average age of people of a country (say India) what will be the appropriate method- mean, median or mode and...

• Replies: 5
• Views: 1,771
09-20-2016, 12:45 PM
26. ### finding percentile from z-score

I have this question which i am so confused how to solve it this is on normal curve. The following table is used to determine the student’s...

• Replies: 1
• Views: 1,255
09-20-2016, 06:24 AM
27. ### Difference in proportion for large sample size

Hi, I have 2 proportions from 2 years: P1(2001): 11000/12500 = 88.0% P2 (2002): 11500/12800 = 89.8% I am interested in knowing if there is a...

• Replies: 3
• Views: 1,838
09-18-2016, 09:33 AM
28. ### F-Statistic

I'm trying to understand the intuition behind the F-Statistic. In ISLR: F=(TSS-RSS)/p /RSS/(n-p-1) The numerator is described as the "between...

• Replies: 5
• Views: 3,187
09-18-2016, 04:17 AM
29. ### Are the parametric analyses appropriate?

In an experimental study, the aesthetic value (independent var) of a picture is manipulated into (low and high quality). "Low Quality" -- to make it...

• Replies: 0
• Views: 1,050
09-15-2016, 07:08 PM
30. ### Themes in Survey Response, maybe PCA

I have a sample of 50 respondents to a cross-sectional (identical) survey administer at four time points. The instrument asks the potential...

• Replies: 9
• Views: 2,550
09-15-2016, 02:06 PM
31. ### Cope with distributions that may take negative numbers

Hi to everyone, I would like to know how to cope with distributions that may take negative numbers when it is physically impossible. For instance,...

• Replies: 16
• Views: 2,964
09-15-2016, 09:27 AM
32. ### Standard Error of Coefficient w/1 Independent Variable

Hi- I'm studying regression via ISLR and trying to manually calc a standard error for a data set to better understand the intuition. Below is my R...

• Replies: 2
• Views: 1,677
09-15-2016, 09:03 AM
33. ### Which hypothesis test to use

I'm doing an assignment and am just a bit rusty and confused. I don't want the answer to the question, just guidance on what sort of test to use. ...

• Replies: 2
• Views: 1,286
09-14-2016, 09:40 AM
34. ### Student T-Test on Area Sizes and P-Value significance

Hello. I am running a t-test. 2 groups, group 1 is a area size of a vein before intervention and the second is a vein after intervention. Some...

• Replies: 1
• Views: 869
09-14-2016, 09:26 AM
35. ### Assess statistical significance of two PPVs

I recently validated a medical diagnosis in order to compose a study population. To do so, we classified each patient with a diagnosis of interest as...

• Replies: 2
• Views: 1,134
09-13-2016, 01:57 PM
36. ### Degrees of Freedom for linear combination of VarianceComponents

I was trying to figure out satterthwaite's degrees of freedom for the combination of variance component to calculate confidence interval. I can...

• Replies: 0
• Views: 907
dsj
09-13-2016, 01:27 PM
37. ### Which ANOVA to use? one-way repeated measures ANOVA test, or a two-way multi-variate

Problem 1 Research Question 1: What effect does providing captions while learners are watching a video have on their comprehension of the video? ...

• Replies: 1
• Views: 907
09-13-2016, 09:32 AM
38. ### (too) small sample size?

Without going into too much detail: I have a number of people every year. At one point, something happens that makes the yearly number of people...

• Replies: 1
• Views: 1,413
09-13-2016, 02:22 AM
39. ### ikelihood

hello, I have a question about the topic ikelihood. In the literature, the likelihood function is used for the estimation of the parameters, and in...

• Replies: 1
• Views: 1,304
09-12-2016, 05:25 PM
40. ### Likert Survey -- Stat for comparing single items and sub categories

Hello, For my dissertation I am using an existing 50 item Likert survey. I am pretty sure I will use a t-test to determine if there are...

• Replies: 1
• Views: 727
09-12-2016, 03:40 AM
41. ### Data Extrapolation for SEM

Hi, I have a data of n=50. Is there any way in which I can extrapolate or simulate the data to n=2000, in order to carry out Structural equation...

• Replies: 4
• Views: 1,762
09-07-2016, 03:10 PM
42. ### Biased and Unbiased Variance

Hello everyone, I did an binomial experiment to flip 10 coins and count the total number of heads.This was repeated 200 times.However at the end...

• Replies: 3
• Views: 3,654
09-07-2016, 07:04 AM
43. ### Can a non-baseline variable be used as a co-variate in ANCOVA?

Dear All, I have a question related to selection of covariates in ANCOVA analysis. I understand that baseline covariates can be selected based...

• Replies: 0
• Views: 1,275
09-07-2016, 04:21 AM
44. ### is a standard deviation value valid when n is 2?

is a standard deviation value valid when n is 2?

• Replies: 3
• Views: 2,445
09-06-2016, 08:23 PM
45. ### Interpretation of 99% confidence interval

Hello guys, this is my first post here in the forum and if I missed anything, then pls correct me. My first statistic class starts this week...

• Replies: 8
• Views: 1,549
09-06-2016, 04:09 PM
46. ### Comparing counts with chi square test of homogeneity

Hi! I need to compare the results of two computer simulations in order to establish their equivalence. Each simulation result (actually it is the...

• Replies: 0
• Views: 1,464
09-06-2016, 04:57 AM
47. ### Paired Sample T-Test, Bivariate Correlation, Factors Influencing Resistance to Change

Hi there, My study investigates factors that influence resistance to change in an organisation. The independent variables are: trust,...

• Replies: 0
• Views: 2,181
09-06-2016, 01:56 AM
48. ### Law of Large numbers(turning pen experiment)

Hello everyone, My class did an turning pen experiment in class,where we turn a pen 5 times eventually, each time there is a possibility of the...

• Replies: 4
• Views: 1,667
09-05-2016, 11:46 PM
49. ### Examine the effect of one independent var

Hi, I want to examine the effect of still images (independent var) with two levels (monochromatic and multi-color) on mood perception (dependent...

• Replies: 0
• Views: 1,356
09-05-2016, 07:32 PM
50. ### calculate the standard error of the mean

To whom it may concern: I have a cognition experiment which has 10 subjects. Each subject performs 400 trials. My advisor wants me to...

• Replies: 2
• Views: 2,439
09-05-2016, 09:41 AM
51. ### Sampling Technique and Sample Size

Hi, I intend to estimate household level gas consumption for a city with a population of 1 million and 200,000 houses through a survey. The city...

• Replies: 3
• Views: 2,237
09-03-2016, 08:36 PM
52. ### N particles in 2 boxes - distinguishable/indistinguishable - probability association

Hi there I'm new here, I have this question on my homework that has been bugging me for a couple of days now and I was wondering if anybody could...

• Replies: 1
• Views: 1,564
09-03-2016, 08:50 AM
53. ### Partial Autocorrelation Function

Hello everyone, I am preparing for a test and I have came across a question I am having problems with: Calculate partial autocorrelation of...

• Replies: 0
• Views: 1,026
09-03-2016, 05:45 AM
54. ### Fisher's exact test - two-tailed

Hi guys, I performed a fisher's exact test on Genstat and got this result: One-tailed significance level 0.563 Mid-P value 0.371 Two-tailed...

• Replies: 1
• Views: 1,682
09-03-2016, 05:26 AM
55. ### Question about permutations ANOVA test

Hello everyone, I have data of a variable from 4 sites, with 3 repetitions from each site. Tests revealed that I do have homoscedasticity but no...

• Replies: 8
• Views: 1,313
09-02-2016, 05:31 AM

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