Random Sample: each member of the population has the same chance of being selected Representative Sample: characteristics should represent those of the target population without bias Observational Study: no intervention by the investigator‚ no treatment imposed Experimental Study: investigator has some control over the determinant Variables: Categorical – each observation falls into a finite number of groups Nominal: named variables with no implied order e.g. personality type Ordinal:
Premium Normal distribution Student's t-test
Harrisburg High school was bully central. 75% of all students were either being bullied or doing the bullying‚ unaware of the damage being done. Students who bully are some of the leading causes of death due to suicide by those bullied. The effects on teenagers are possible suicide and low self-esteem‚ one possible solution would be counseling for those who bully. To begin‚ an effect of bullying on teenagers is possible suicide. Kayla Marcella would be 19 years old this year .Marcella committed
Free Self-esteem Bullying
Term Random Variable Definition A variable that takes on different numerical values based on chance Term Discrete Random Variable Definition A random variable that can only assume a finite number of values or an infinite sequence of values such as 0‚1‚2‚3.... Term Continuous Random Variables Definition Random variables that can assume any vallue in an interval. Term Expected Value Definition The mean of a probability distribution. the average value when the experiment
Premium Probability theory Random variable Binomial distribution
GMB 713 PROBLEM SET NO. 2 PROBLEM SOLVING: Solve the following problems. Show all pertinent solutions. 1. A car battery dealer is trying to determine which of the brands of car battery he is selling has a longer life span. He conducted an investigation by interview his customers and was able to get the following results: Brand X Brand Y Mean life span 4.5 years 4.9 years Standard deviation
Premium Arithmetic mean Standard deviation Problem solving
Math 221 Quiz Review for Weeks 3 and 4 1. State whether the variable is discrete or continuous. The # of keys on each student’s key chain. 2. Decide whether the experiment is a binomial experiment. Explain why by citing the properties of binomial experiments. Testing a pain reliever using 20 people to determine if it is effective. The random variable represents the number of people who find the pain reliever to be effective. 3. Use the binomial probability distribution to answer the following
Premium Computer Mathematics Personal computer
ALLAMA IQBAL OPEN UNIVERSITY ISLAMABAD (Department of Business Administration) *** BUSINESS MATHEMATICS AND STATISTICS (MBA-5528) CHECKLIST SEMESTER: AUTUMN 2010 This packet comprises the following material: 1. Text books (two) 2. Course outline 3. Assignment No.1 & 2 4. Assignment forms (2 sets) In this packet‚ if you find anything missing out of the above mentioned material‚ please contact at the address given below: Deputy Registrar (Mailing) Services Block # 28 Allama
Premium Normal distribution Probability theory
official crime statistics and victimisation surveys? Looking at Crime Statistics and Victimisation Surveys can be very helpful when looking at the rates in which crimes are committed and the annual crime rate throughout the UK. This essay will cover the strengths and weaknesses of Official Crime Statistics and Victimisation Surveys. This will show if the strengths and weaknesses contradict each other. Presented within this essay you will find information about crime statistics and how they have
Premium Crime Criminology
Alcohol and Drug Abuse Statistics Alcohol is the oldest drug around. It is also the most widely-used and almost 50 percent of people aged 12 and over have consumed alcohol in the United States. Most people are able to consume alcohol responsibly. However‚ for one reason or another‚ some people abuse alcohol and develop addictions. Drug information from the American Council for Drug Education (ACDE)states that approximately 10 to 15 million people in the United States can be classified as alcoholics
Premium Drug addiction Drug abuse
Objectives: To estimate the population parameters from sample statistics‚ using interval estimate (90%‚ 95% and 99% levels). The project consists of three parts as listed below. You should carefully read the instructions. This project is Group based (2 – 3) and each Group will have different results based on the initial data generated. Make sure to include all your work in the final report submitted. You will submit your final work (Report and Spreadsheet on Bb Learn) PART I: Sample Generation-
Premium Statistics Null hypothesis Standard deviation
Braemar Seascope Research 1st April 2012 All details given in good faith and without guarantee For Tanker Chartering please telephone +44 (0)20 7535 2626. Tanker Fleet Statistics Braemar Seascope Research The information and analysis contained within this report is believed to be correct as of 1st April 2012 and is presented in good faith. Whilst much effort has been made to ensure the accuracy of the information and analysis contained herein this cannot be guaranteed. In the event
Premium Years in the future