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.

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: "Which of the following best describes your primary business: a.manufacturing,b.wholesaler,c.retail,d.service." The measurement level for this question is _________________.

All numerical data must be analyzed statistically in the same way because all of them are represented by numbers.

A large manufacturing company in Indianapolis produces valves for the chemical industry. According to specifications,one particular valve is supposed to have a five-inch opening on the side.Quality control inspectors take random samples of these valves just after the hole is bored. They measure the size of the hole in an effort to determine if the machine is out?of?adjustment. The measurement of the diameter of the hole represents which level of data?

The Chamber of Commerce wants to assess its membership's opinions of the North American Free Trade Agreement. One-hundred of the 2,000 members are randomly selected and contacted by telephone.Seventy-five reported an overall favorable opinion,and twenty-five reported an overall unfavorable opinion. The proportion,0.75,is a ___________.

Variables and measurement data are interchangeable terms.

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.Sue is ordering a __________.

The basis for inferential statistics is the ability to make decisions about population parameters without having to complete a census of the population.

One of the main ways to organize the study of statistics is to divide it in two branches.These two branches are _______ statistics and _______ statistics.

A portion or subset of the entities under study is called the statistic.

The manner in which numerical data can be analyzed statistically depends on the level of data measurement represented by numbers being analyzed.

Pinky Bauer,Chief Financial Officer of Harrison Haulers,Inc.,suspects irregularities in the payroll system,and orders an inspection of "every tenth payroll voucher issued since January 1,2013." Pinky is ordering a __________________.

Which scale of measurement has these two properties: linear distance is meaningful and the location of origin (or zero point)is absolute (or natural)?

Statistics is commonly divided into two branches called descriptive statistics and summary statistics.

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 ______________.

A new sales person is paid a commission on each sale. This person made $2,000 his first month on the job. From this he concludes that he will make $24,000 during his first year. This is an example of _______.

Miguel Hernandez,Senior Vice President of Human Resources at Memorial Hospital is exploring the usage of nursing overtime in the emergency department during the last operating year.Staffing records and emergency department visits for all 360 days between the period of January 1,2012,and December 31,2012,are selected for analysis. Miguel's dataset can best be classified as a

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

Which scale of measurement has these two properties: linear distance is meaningful and the location of origin (or zero point)is arbitrary?