Exam 1: Data Collection

Determine the Level of Measurement of a Variable -height of a tree

Obtain a Simple Random Sample -The policy committee at State University has 6 members: John, Prof. Rise, Dr. Hernandez, LaToyna, Ming, and Jose. A subcommittee of two members must be formed to investigate the visitation policy in the dormitories. List all possible simple random samples of size 2.

Describe the Characteristics of an Experiment -The variable measured in the experiment is called ____________ .

Determine the Level of Measurement of a Variable -a student s favorite sport

Explain the Randomized Block Design -A farmer wishes to test the effects of a new fertilizer on her tomato yield. She has four equal-sized plots of land-- one with sandy soil, one with rocky soil, one with clay-rich soil, and one with average soil. She divides each of the four plots into three equal-sized portions and randomly labels them A, B, and C. The four A portions of land are treated with her old fertilizer. The four B portions are treated with the new fertilizer, and the four C s are treated with no fertilizer. At harvest time, the tomato yield is recorded for each section of land. What is the treatment in this experiment

Describe the Characteristics of an Experiment -What is a designed experiment

Determine the Level of Measurement of a Variable -category of storm (gale, hurricane, etc.)

Determine whether the underlined value is a parameter or a statistic. -The average age of the 65 students in Ms Hope s political science class is 21 years 5 months.

Administrators at a large university want to know the average debt incurred by their graduates. Surveys were mailed to 210 graduating seniors asking them to report their total student loan debt. Identify the population, sample, and individuals in the study.

Determine whether the quantitative variable is discrete or continuous. -the number of goals scored in a hockey game

Determine the sampling technique which is used -At a local technical school, five auto repair classes are randomly selected and all of the students from each class are interviewed. What sampling technique is used

Provide an appropriate response. -The number of violent crimes committed in a city on a given day in a random sample of 50 days is a __________ random variable.

Classify the variable as qualitative or quantitative. -the number of calls received at a company s help desk

Describe the Characteristics of an Experiment -An experiment in which neither the experimental unit nor the researcher in contact with the experimental unit knows which treatment the experimental unit is receiving is called a ________________ .

Explain the Matched-Pairs Design -A medical journal published the results of an experiment on anorexia. The experiment investigated the effects of a controversial new therapy for anorexia. Researchers measured the anorexia levels of 68 adult women who suffer moderate conditions of the disorder. After the therapy, the researchers again measured the women s anorexia levels. The differences between the the pre- and post-therapy anorexia levels were reported. What is the response variable in this experiment

Determine the sampling technique which is used -To avoid working late, the plant foreman inspects the first 60 microwaves produced that day. What sampling technique was used

Determine the sampling technique which is used -Thirty-five math majors, 64 music majors and 35 history majors are randomly selected from 454 math majors, 309 music majors and 567 history majors at the state university. What sampling technique is used

Determine whether the quantitative variable is discrete or continuous. -the low temperature in degrees Fahrenheit on January 1st in Cheyenne, Wyoming

Determine the Level of Measurement of a Variable -time spent playing basketball

Obtain a Simple Random Sample -The city council of a small town needs to determine if the town s residents will support the building of a new library. The council decides to conduct a survey of a sample of the town s residents. Which one of the following procedures would be most appropriate for obtaining a sample of the town s residents