Exam 1: Introduction to Statistics

With interval-level data,the zero point is a matter of convention and does not mean the absence of the phenomenon under observation.

A question in a survey of microcomputer users asked: "Which operating system do you use most often: a.Apple OS 7,b.MS DOS,c.MS Windows 95,d.UNIX." The measurement level for this question is _________________.

Gathering data from a sample to reach conclusions about the population from which the sample was drawn is called descriptive statistics.

Measurements occur when a standard process is used to assign numbers to attributes or characteristics of a variable.

The Magnolia Swimming Pool Company wants to determine the average number of years it takes before a major repair is required on one of the pools that the company constructs.The president of the company asks Rick Johnson,a company accountant,to randomly contact fifty families that built Magnolia pools in the past ten years and determine how long it was in each case until a major repair.The information will then be used to estimate the average number of years until a major repair for all pools sold by Magnolia.The average based on the data gathered from the fifty families can best be described as a _______.

Rebecca Sear,Marketing Director of a regional restaurant chain,is directing a study to identify and assess the in-dining experience of the customers at one of the restaurants..She directs her staff to design a web-based market survey for distribution to all of the restaurant's 1265 customers who enjoyed a meal during the past 6 months.For this study,the set of 1265 customers is ________________.

Sue Taylor,Director of Global Industrial Sales,is concerned by a deteriorating sales trend. Specifically,the number of customers is stable at 1,500,but they are purchasing less each year. She orders her staff to search for causes of the downward trend by surveying all 1,500 industrial customers.One question on the survey asked the customers: "How many people does your company employ? The measurement level for this question is __________.

A level of data measurement that has an absolute zero is called _______.

A manager was asked to rate the performance of his employees on a scale of 1 to 6.A 1 means that the performance is awful while a 6 means that it is excellent.The measurement level of this data is _______.

Variables and measurement data are interchangeable terms.

Which of the following operations is meaningful for processing nominal data?

A business is attempting to find the best small town in the United States in which to relocate.As part of the investigation,the elevations of all small towns in the United States are researched.Some towns are located high in the Rockies with elevations over 8,000 feet.There are even some towns located in the south central valley of California with elevations below sea level.These elevations can best be described as which level of data?

Scholastic Aptitude Test scores are an example of what type of measurement scale?

A student makes an 82 on the first test in a statistics course.From this,she estimates that her average at the end of the semester (after other tests)will be about 82.This is an example of ___.

Rebecca Sear,Marketing Director of a regional restaurant chain,is directing a study to identify and assess the in-dining experience of the customers at one of the restaurants.She directs her staff to design a web-based market survey for distribution to all of the restaurant's 100 customers who enjoyed a meal during the past 6 months.For this study,the set of 100 customers is ________________.

A descriptive measure of the sample is called a statistic.

A market researcher is interested in determining the average income for families in Duval County,Florida.To accomplish this,she takes a random sample of 400 families from the county and uses the data gathered from them to estimate the average income for families of the entire county.This process is an example of _______.

Numbers which are used only to classify or categorize the observations represent data measured at the nominal level.

The lowest level of data measurement is _______.

Sue Taylor,Director of Global Industrial Sales,is concerned by a deteriorating sales trend. Specifically,the number of industrial customers is stable at 1,500,but they are purchasing less each year.She orders her staff to search for causes of the downward trend by surveying all 1,500 industrial customers.For this study,the set of 1,500 industrial customers is ______________.