1. Statistical tests - help please!

Hi all, I am writing a project plan and I am struggling with the statistical analysis plan as I am in the early stages of learning. I was hoping someone could guide me with what stats tests I could conduct with the following primary endpoint - thank you. Alternative hypothesis: treatment is...

Hi all, I am writing a project proposal: randomized, placebo-controlled crossover trial, I will be investigating treatment vs air. Participants will be asked to inhale the treatment or high-flow air (placebo). In this case, would a one-tailed test or a two-tailed test be more appropriate...

A teacher gives a 20-point test to 12 students. The scores are shown below. 18 17 12 8 8 17 3 7 12 10 20 12 Find the following: Mean Mode(s)...
4. Help! Brand new at r! Do you see the error here?

Can anyone see the error in this? I have used a mock-up model successfully twice, with same spacing, etc., and have gotten great graphs (in the 29 hours since I learned of R's existence). I am going crazy! title.main <- "How Clients Learned VAC Offers HIV/STI Testing" cats <-...
5. Error: (2067) The Excel file is password protected. Unable to open the file.

Hello everybody, For my study I have to use SPSS. I used an online survey tool where I had the opportunity to download the result in an Excel file. Thereafter I tried to open the file in SPSS. However, it keeps showing the error 'Error: (2067) The Excel file is password protected. Unable to...
6. Choosing the Correct Analysis - Comparing Categorical Independent Variables (STATA)

So I want to compare the rates of infection in patients who received drugs A, B, C, and D. Patients could have received one, two, three, or all four drugs, and they could have been given each at different days during their stay. Infection could have happened before the drug was administered, or...
7. Trying to find MS Excel Wilcoxon Rank Sum test example

I am a pharmacy student doing a 4th year (final year) Capstone Research Project. I am attempting to run my data utilizing a Wilcoxon Rank Sum Test on MS Excel. I was wondering if anyone had any ideas of a good tutorial on how to do that? I've searched YouTube but it was not helpful in...

Hello everyone, I'm an undergraduate thesis student working on analyzing plant data using the vegan package in R. Both my professor and I are beginners to using the program and have run into difficulty with calculating shannon's diversity for all of our sample periods. I'm not sure if this is...
9. Question about Fisher's Exact Test

Hi everyone- new to posting here. I am wondering if I can get some feedback on simple code for a Fisher's test, as I am pretty new to R. I am inputting a 3x2 table, may be easier just to see the table/code below. The output I get looks pretty different to me than the output I got for a 2x2...
10. Help on our research

Please help me determine what statistics should we use IV= Dimple Placement/location, 6 kinds of dimple placement EXAMPLE PIC of our questionair: http://oi61.tinypic.com/350tfg4.jpg DV= Level of attraction Our questionaire looks like this the Picture of the guy with diff kinds of...
11. R results interpretation??

Hi all, First time poster and a novice with this stuff so please go easy! Although I would really appreciate some help. I have been given a model that looks at the relationship between two variables from 70s to 2014, it uses a deterministic time varying coefficient (DTVC) model weighted...

Hi! Please, please help! have a paper due in 8 days! and can't figure out how to work this out in SPSS. I am looking at whehter there is a relationship between unintended pregnancies (defined as the summation of mistimed and unwanted pregnancies) and experience with intimate partner violence...
13. Hypothesis Test Help!

Here is what I have thus far. My teacher has a theory that 40% of students at the university are female. I needed to survey 30 random students and asked them if they think 40% of students are female. 22 said yes while 8 said no. I need to carry out a hypothesis test to claim his...
14. Poisson Model Help

Hi everyone, I am having a hard time finding my lambda for this homework question. I know something has to be multiplied to get it into the same units and that lambda has to be an average. However all the information I am given is an average. If you could help me that would be great!! Here...
15. Normal probability question help

Hello Statisticians! I would really really appreciate any help with this question: Q. The grade a student receives in an exam is given my a normal distribution with mean 3.5 and variance 1/16. 1. Find the probability the the student scores between 3.4 and 3.6 for an individual course...
16. Kruksall-Wallis VS Chi-Squared

Hello, I'm working on an MSc project and struggling with the stats side of things (I'm a linguist, not a statistician). I have data on 2 children telling me when they use certain verb types in response to an animated video clip. Each video clip has received a rating of perceived humanness...
17. how to determine what test to use for a project?

I'm trying to determine if there is a statistical significance in hospital admission rates (asthma and bronchitis) before and after tobacco regulations went in to affect. I got the crude and adjusted rates with the 95% Confidence Intervals. Can I just use the 95%CIs to show statistical...
18. 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 be quadratic, and a quadratic model does have a very high r^2 (over .90). However, as is common in polynomial regression, there is a high degree of...
19. GLLAMM help please? 3-level, random coefficient at level 3

Dear Talk Stats, I have a question regarding the use of gllamm for multi-level modelling of ordinal variables in STATA. A brief description of my data and aim. I have individuals nested in schools nested in cities i.e. 3-levels. My dependent variable is 4-options from 1 to 4 on...
20. How To Reject Null When Unequal Samples? Should I Use Welch's, ANOVA or What?

PLEASE HELP ME - Should I Use Welch's, ANOVA or What? THANKS :) Hello, I am in the 7th grade, working on a science fair project. I engineered an electronically enhanced vision device, which I call "XYZ glasses." I have built a prototype and tested it with 17 different people. I am now...