Exam 1: Data and Statistics

The number observations in a complete data set having 10 elements and 5 variables is

Which of the following is NOT a scale of measurement?

A statistics professor asked students in a class their ages. On the basis of this information, the professor states that the average age of all the students in the university is 21 years. This is an example of

The following table shows the starting salaries of a sample of recent VoTech graduates. a.What percentage of graduates in the sample had starting salaries of at least $30,000? b.Of the graduates in the sample, what percentage had starting salaries of less than $25,000? c.Based on this sample, what percentage of all VoTech graduates do you estimate to have starting salaries of at least $20,000?

A pharmaceutical company is performing clinical trials on a new drug that is intended to relieve symptoms for allergy sufferers. Twelve percent of the 300 clinical trial participants experienced the side effect dry mouth. a.What is the population being studied? b.What is the sample being studied? c.Based on the sample, what percentage of the population do you think would suffer from dry mouth?

Data collected over several time periods are

For ease of data entry into a university database, 1 denotes that the student is an undergraduate and 2 indicates that the student is a graduate student. In this case data are

When the data are labels or names used to identify an attribute of the elements and the rank of the data is meaningful, the variable has which scale of measurement?

Income is an example of

A portion of the population selected to represent the population is called

Quantitative data that measure how many are ________; quantitative data that measure how much are ________.

In an application for a credit card, potential customers are asked for their social security numbers. A social security number is an example of a

__________ is an example of an existing source of data.

The weight of a ball bearing, measured in milligrams, is an example of

The major applications of data mining have been made by companies with a strong _______ focus.

When the data are labels or names used to identify an attribute of the elements, the variable has which scale of measurement?

A sample of five Fortune 500 companies showed the following revenues ($ millions): 7505.0, 2904.7, 7208.4, 6819.0, and 19500.0. Based on this information, which of the following statements is correct?

The profits earned by a particular Fortune 500 company, measured in millions of dollars, is an example of

Exhibit 1-1 In a recent study based upon an inspection of 200 homes in Daisy City, 120 were found to violate one or more city codes. -Refer to Exhibit 1-1. The city manager released a statement that 60% of Daisy City's 3,000 homes are in violation of city codes. The manager's statement is an example of

Statistical studies in which researchers do not control variables of interest are