Exam 1: Defining and Collecting Data

The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class.Among the 50 students in her class,20% were freshmen,50% were sophomores and 30% were juniors.She decided to select 2 students randomly from the freshmen,5 randomly from the sophomores and 3 randomly from the juniors.This is an example of a systematic sample.

Which of the following is a continuous quantitative (numerical)variable?

Most colleges admit students based on their achievements in several different areas.The total SAT score achieved by a student is an example of a numerical variable.

The level of satisfaction ("Very unsatisfied","Fairly unsatisfied","Fairly satisfied",and "Very satisfied")in a class is an example of a categorical variable.

A study attempted to estimate the proportion of Florida residents who were willing to spend more tax dollars on protecting the beaches from environmental disasters.Twenty-five hundred Florida residents were surveyed.What type of data collection procedure was most likely used to collect the data for this study?

Which of the following yields a stratified sample?

SCENARIO 1-2 A Wall Street Journal poll asked 2,150 adults in the U.S.a series of questions to find out their view on the U.S.economy. -Referring to Scenario 1-2,the population of interest is

Sampling error can be eliminated by taking larger sample sizes.

Marital status is an example of a numerical variable.

The professor of a business statistics class wanted to find out the mean amount of time per week her students spent studying for the class.She divided the students into the left,right and center groups according to the location they sat in the class that day.One of these 3 groups was randomly selected and everyone in the group was asked the mean amount of time per week he/she spent studying for the class.This is an example of a cluster sample.

The question "Is your household income last year somewhere between $50,000 and $100,000?" will most likely result in coverage error.

SCENARIO 1-2 A Wall Street Journal poll asked 2,150 adults in the U.S.a series of questions to find out their view on the U.S.economy. -Referring to Scenario 1-2,the possible responses to the question "How many people in your household are unemployed currently?" result in

The chancellor of a major university was concerned about alcohol abuse on her campus and wanted to find out the proportion of students at her university who visited campus bars on the weekend before the final exam week.Her assistant took a random sample of 250 students.The answer on "whether you visited campus bars on the weekend before the final exam week" from students in the sample is an example of .

The amount of alcohol consumed by a person per week will be measured on an interval scale.

Which of the following yields a simple random sample?

The Human Resources Director of a large corporation wishes to develop an employee benefits package and decides to select 500 employees from a list of all (N = 40,000)workers to study their preferences for the various components of a potential package.All the employees in the corporation constitute the .

A study is under way in Yosemite National Forest to determine the adult height of American pine trees.Specifically,the study is attempting to determine what factors aid a tree in reaching heights greater than 60 feet tall.It is estimated that the forest contains 25,000 adult American pines.The study involves collecting heights from 250 randomly selected adult American pine trees and analyzing the results.Identify the population from which the study was sampled.

The portion of the universe that has been selected for analysis is called

The quality ("terrible","poor","fair","acceptable","very good" and "excellent")of a day care center is an example of a numerical variable.

The British Airways Internet site provides a questionnaire instrument that can be answered electronically.Which of the 4 methods of data collection is involved when people complete the questionnaire?