# t-test

14. ### comparing test results obtained on the basis of different sample sizes

I have variables a1 and a2 with 57 observations each, and variables b1 and b2 with 29 observations each. I compare a1 with a2 by means of a paired-samples t-test, this gives p<0.001. Next, I compare b1 with b2 by means of a paired-samples t-test, this gives p>0.05 (actually p>0.10). I compared...
15. ### I need some help for my thesis about t-testing different data sets

Hello everybody, I'm conducting research on price dispersion to show that offline price dispersion is significantly smaller than online price disperison. I have up until today, monitored and collected over 1500 prices in excel on several homogeneous products in...
16. ### Assumptions for comparing means and which test to use

I am attempting to compare the means of soil moisture measured from two adjacent soil profiles at both 10cm and 30cm. Soil measurements were measured discretely six times over the course of two months at the same date and time for each profile. However, when looking to perform tests to compare...
17. ### What test do I use?

I have done a study comparing double leg and single leg landing techniques, I want to look at the differences between knee flexion, angular vel, and GRF between the two conditions, what test should I use? I would appreciate any help at all!
18. ### Can I use an independent t-test to test for significant differences over time?

I have a 50 year time series (2012-2062), and I would like to test to see whether sig. differences exist between two groups of data subjected to different conditions. I understand that a t-test tests for sample means, however does this test still apply if I am looking at differences over time...
19. ### Selecting of statistical test?

I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction positive and what qualities would make a treatment interaction negative. As part of my analysis I have totalled: - the number of positive...
20. ### ANOVA or T-test

Hi I have two categorical variables as in below example: Region Dim Value PK Dim1 2 PK Dim2 3 PK Dim3 -1 PK Dim4 -4 US Dim1 -0.5 US Dim2 4.3 US Dim3 2.1 US Dim4 2 PK Dim1 5 PK Dim2 -0.4 PK Dim3 -0.3 PK Dim4 0.8 US Dim1 1 US Dim2 2 US Dim3 0.8 US Dim4 1 I want to compare the variables US and PK...