# stat

1. ### Help Determing What Distribution

I believe I have answered a), as L~Gamma(N,1/20), therefore mgf = (20/(20-t))^N (if wrong please feel free to correct me). It has been defined that L=-ln(U), and I am finding difficulty in determing what distribution U would be classified as. Once classfieid, I believe that finding the mean...
2. ### Which statistical test do I need to use?

I have a dataset showing the yearly stock returns for two investment styles (growth and value investing) as well as a column showing the difference between the returns for each year. I have attached a picture below. I want to do a test to see if the difference is significant for each individual...
3. ### Questions on the Fundamentals for Various Sampling Methods

Hello, I've recently been studying various sampling methods, specifically SRS (Simple Random Sampling), Stratified Sampling, Ratio/Regression Estimation, and Cluster Sampling. I wanted to ask a few questions regarding these methods to better understand the pros and cons for each of them and when...
4. ### What is the correct statistical test for my data

Hi, So I was wondering which test to use for my data I have data on trail length which is my dependant variable and I want to see if there is any significant difference between orientation (East, West, North and South). I have 4 plots that I want to test against one another to see if there is...
5. ### need help with my analysis

am checking the impact of the different type of boats on the dolphins behaviour and i have two type of variables first is boat type ( fishing , recreation , cargo etc ) and i have the dolphins behaviour which divided into 4 type of behaviour ( rest , social , travel , feed) i need some help...
6. ### Binomial Theorem

I'm trying to do this following below in R: The Harriet Hotel in downtown Boston has 100 rooms that rent for $150 per night. It costs the hotel$30 per room in variable costs (cleaning, bathroom items, etc.) each night a room is occupied. For each reservation accepted, there is a 5% chance...
7. ### Twins raised together and twins raised apart

Greetings All, I am examining smoking behavior in a sample of twins raised apart and together.I have repeated measures at different time points asking participants if they smoke or not. I also have a question about whether the participant grew up in a household where parents smoked. My...
8. ### Statistical method to compare two experiments

I have two data from biological experiment where two types of cells were measured. For each cell the data about composition of the membrane where extracted under different condition of the experiment (repeated 3 times), composition is in percentage, so sum of each column is 100%. I would...
9. ### Help***SAS - Fill missing value with the last non missing value variable

Hi, I wanted to fill missing value with the last non missing value variable. +----------+--------+-------+ | Variable | Level | Value | +----------+--------+-------+ | | men | 10 | |sexe | female | 20 | | | 0-20 | 5 | |...
10. ### Mean Residual Life

Hi, I've been tasked with solving the mean residual life given the density function f(x) and the survival function S(x) I think mean residual life can be calculated by: mrl(x)=[∫(t-x)f(x)dt]/S(x)] or mrl(x)=∫S(t)dt/S(x) the problem is, f(x) contains the gamma function and I don't...
11. ### HELP!!! Chi-Square Tests

What is the difference between Homogeneity of proportions across two or more groups, Test of independence, and Goodness of fit test? Also, how would you know which test was used if all you are given is X-squared=31.3695, df=2, p-value=1.542e-07? And based on those outputs, how do you...
12. ### How to Determine if 2 variables are dependent?

I'm trying to figure out whether or not citation flow and trust flow are independent of each other (here is the article containing the data: http://www.3ders.org/articles/20120514-which-company-in-3d-printing-world-has-better-link-profile-quality.html). Is there a certain test or method that can...
13. ### Need Help in STAT Project

Please help me I have this project for Stat in Excel. I need to answer the following questions in the the attached worksheet. I have completed questions 1 - 4, But I am having hard time figuring out question 5 - 9. Please help me I am desperate. thank you. The College Gift Shop wants to have...