Exam 1: Defining and Collecting Data

The answer to the question "How many hours on average do you spend watching TV every week?" is an example of a ratio scaled variable.

In business statistics class students sit randomly without preferences.A sample is selected by including everybody who sits in the first row.This is an example of a cluster sample.

The brand of TV one owns is an example of a numerical variable.

To obtain a sample of 10 books in the store,the manager walked to the first shelf next to the cash register to pick the first 10 books on that shelf.This is an example of a

The oranges grown in corporate farms in an agricultural state were damaged by some unknown fungi a few years ago.Suppose the manager of a large farm wanted to study the impact of the fungi on the orange crops daily over a 6-week period.On each day a random sample of orange trees was selected from within a random sample of acres.The daily average number of damaged oranges per tree and the proportion of trees having damaged oranges were calculated.The two main measures calculated each day (i.e. ,average number of damaged oranges per tree and proportion of trees having damaged oranges)may be used daily to estimate the respective true population .

Which of the following yields a systematic sample?

Student grades (A to F)are an example of continuous numerical data.

To estimate the mean number of hours a student at a major university spent in the library,a researcher obtained the list of students from the registrar's office,from which she can select a random sample of 200 students.This list is a .

Using different frames to generate data can lead to totally different conclusions.

Which of the following scenarios will yield a nonprobability sample?

The Dean of Students conducted a survey on campus.SAT score in mathematics is an example of a numerical variable.

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 out of every 10 U.S.voters do you think feel that the U.S.economy is in a good shape?" result in

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 fifty students on her roster into ten groups starting from the first student on the roster.The first student was randomly selected from the first group.Then every tenth student was selected from the remaining students.This is an example of a cluster sample.

Which of the following is most likely a population as opposed to a sample?

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 sample in the study.

SCENARIO 1-1 The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a Blu-ray player made by the company over the past 12 months are satisfied with their products. -Referring to Scenario 1-1,the possible responses to the question "Are you happy,indifferent,or unhappy with the performance per dollar spent on the Blu-ray player?" are values from a

A personal computer user survey was conducted.Computer brand primarily used is an example of a variable.

A telemarketer set the company's computerized dialing system to contact every 25th person listed in the local telephone directory.What sampling method was used?

Which of the following is NOT a reason for selecting a sample?

The Quality Assurance Department of a large urban hospital is attempting to monitor and evaluate patient satisfaction with hospital services.Prior to discharge,a random sample of patients is asked to fill out a questionnaire to rate such services as medical care,nursing,therapy,laboratory,food,and cleaning.The Quality Assurance Department prepares weekly reports that are presented at the Board of Directors meetings and extraordinary/atypical ratings are easy to flag.Values computed from the sample results each week are called .