Exam 1: Data and Statistics

Exhibit 1-2 In a sample of 1,600 registered voters, 912, or 57%, approve of the way the President is doing his job. -Refer to Exhibit 1-2. A political pollster states: "Fifty-seven percent of all voters approve of the President." This statement is an example of

The following table shows the starting salaries of a sample of recent business 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 business graduates do you estimate to have starting salaries of at least $20,000?

Categorical data

The following information regarding a sample of seven students is provided. a.How many elements are in the above data set? b.How many variables are in this data set? c.How many observations are in this data set? d.Which variables are categorical and which are quantitative variables? e. What measurement scale is used for each variable?

A characteristic of interest for the elements is called a(n)

The ordinal scale of measurement has the properties of the

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

The weight of a candy bar in ounces is an example of

The owner of a factory regularly requests a graphical summary of all employees' salaries. The graphical summary of salaries is an example of

Which of the following is not a scale of measurement?

The following data shows the yearly income distribution of a sample of 200 employees at MNM, Inc. a. What percentage of employees has yearly incomes of $35,000 or more? b. Is the figure (percentage) that you computed in Part a an example of statistical inference? If no, what kind of statistics does it represent? c. Based on this sample, the president of the company said that "45% of all our employees' yearly incomes are $35,000 or more." The president's statement represents what kind of statistics? d. With the statement made in Part c, can we be assured that more than 45% of all employees' yearly incomes are at least $35,000? Explain. e. What percentage of employees of the sample has yearly incomes of $29,000 or less? f. How many variables are presented in the above data set? g. The above data set represents the results of how many observations?

The highway patrol is interested in determining the average speed of automobiles traveling on I-75 between Chattanooga and Atlanta. To accomplish this task, the speed of every tenth car passing a particular point on I-75 is recorded. a.What is the population for this study? b.What constitutes the sample? c.Is speed a categorical or a quantitative variable? d.What type of measurement scale is used?

Exhibit 1-4 In many universities, students evaluate their professors by means of answering a questionnaire. Assume a questionnaire is distributed to a class of 45 students. Students are asked to answer the following: 1. Sex 2. Race (Black, White, Other) 3. Age 4. Number of hours completed 5. Grade point average "6. My instructor is a very effective teacher " -Refer to Exhibit 1-4. How many elements are in the above data set?

The height of a building, measured in feet, is an example of

Data

The average age in a sample of 190 students at City College is 22. As a result of this sample, it can be concluded that the average age of all the students at City College

The collection of all elements of interest in a particular study is

The scale of measurement that is simply a label for the purpose of identifying the attribute of an element is the

Exhibit 1-1 In a recent study based upon an inspection of 200 homes in Daisy City, 80 were found to violate one or more city codes. -Refer to Exhibit 1-1. The Daisy City study described above is an example of the use of a

Exhibit 1-1 In a recent study based upon an inspection of 200 homes in Daisy City, 80 were found to violate one or more city codes. -Refer to Exhibit 1-1. The city manager released a statement that 40% of Daisy City's 2,000 homes are in violation of city codes. The manager's statement is an example of