Exam 1: Introduction to Statistics

Interval- and Ratio-level data are sometimes referred to as quantitative data.

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 __________.

A variable is a numerical description of each of the possible outcomes of an experiment.

Jessica Salas,president of Salas Products,is reviewing the warranty policy for her company's new model of automobile batteries.Life tests performed on a sample of 100 batteries indicated an average life of seven years under normal usage.Jessica recommended a six-year warranty period for the new model.This is an example of _____________.

A market research analyst has asked consumers to rate the appearance of a new package on a scale of 1 to 5.A 1 means that the appearance is awful while a 5 means that it is excellent.The measurement level of this data is _______.

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 20 days between the period of January 1,2012 and December 31,2012 are selected for analysis.For this study,the group of 20 days is a __________.

The social security number of employees would be an example of what level of data measurement?

A person has decided to code a particular set of sales data.A value of 0 is assigned if the sales occurred on a weekday,and a value of 1 means it happened on a weekend.This is an example of _______.

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 _________________.

Which of the following operations is meaningful for processing ordinal data,but is meaningless for processing nominal data?

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 selecting a focus group of 40 industrial customers.Sue is ordering a __________.

The complete collection of all entities under study is called the sample.

The lowest level of data measurement is the ratio level.

Using data from a group to generalize to a larger group involves the use of _______.

The highest level of data measurement is the ratio level.

A local manufacturing plant randomly selected 200 items from a production run and 9 of them are defective.The proportion of defective items in this sample is a ________

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

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 selecting a focus group of 40 industrial customers.For this study,the set of 40 industrial customers is ________.

On discovering an improperly adjusted drill press,Jack Joyner,Director of Quality Control,ordered an inspection of every fifth casting drilled during the evening shift.Less than 1% of the castings were defective; so,Jack released the evening shift's production to assembly.This is an example of _______________.

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