Exam 1: Introduction to Statistics

During the Valentine's season,different offices in a company are encouraged to decorate their doors. A committee then goes around and ranks the doors according to how well the doors are decorated.The best door gets a ranking of "1"; the second best gets a ranking of "2",etc. The numbers of these rankings represent which level of data?

Statistics can be used to predict the business future.

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 _______________.

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

The Universal Pulp Company has a plant in Portland,Oregon. Management wants to determine the average number of sick days taken per worker in this plant in 2012.To do this,the management gathers records on all the workers in the plant and averages the number of sick days taken in 2012 by each worker. This process is using _______.

A descriptive measure of the population is called a parameter.

A marketing demographic survey is undertaken to determine the market potential for a new product. One of the questions asked is: What type of residence do you live in? Respondents are offered several possible answers including: house,apartment,or condominiums. In order to computerize the survey answers,the responses are coded as a 1 if the answer is "house",a 2 if the answer is an "apartment",and a 3 if the answer is a "condominium".These numbers,1,2,and 3,are examples of which level of 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 __________.

A census is the process of gathering data on all the entities in the population.

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

Statistics are used to market vitamins.

You are the owner of a camping site and want to estimate the average age of your customers.For this purpose,you select a representative sample of your clients and offer them a discount good for their next visit as compensation for filling out a short questionnaire that includes relevant age intervals: "Your age is (a)30 or younger,(b)30 to 40,(c)40 to 50,(c)50 to 60,(d)60 or older.This is an example of _______.

A cancer research group was interested in determining the percentage of women 40 years or older that have regularly scheduled mammograms.To accomplish this,they surveyed 500 women in this age group and based on 155 women that responded affirmatively,estimated the percentage of all women in this age group that have regularly scheduled mammograms.This process is an example of _________.

A researcher wants to know what the average variation is in altimeters of small,privately owned airplanes.The task of determining this is expensive and time consuming,if even possible,given the large number of such airplanes. The researcher decides to use government records to randomly locate the owners of ten such planes and then get permission to test the altimeters.When the researcher is done,he will use the data gathered from the group of ten to reach conclusions about all small,privately owned airplanes.This process can best be described as _______.

Grades on a test range from 0 to 100. This level of data is _______.

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 _____________.

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

Miguel Hernandez,Senior Vice President of Human Resources at Memorial Hospital,is exploring the usage of nursing over-time hours in the emergency department during the last operating year (January 1,2012,through December 31,2012).Miguel intends to survey the emergency department nurses regarding their perception of over-time needs.For this survey y the set of all emergency department nurses who worked at Memorial Hospital during the last operating year is _________.

The lowest level of data measurement is the ratio level.

You are the owner of a camping site and want to estimate the average age of your customers.For this purpose,you select a representative sample of your clients and offer them a discount good for their next visit as compensation for filling out a short questionnaire that includes relevant age intervals.The average age of the customers who fill out the questionnaire is: