Exam 1: Data and Statistics

The following information regarding a sample of seven students is provided. Student Identification Grade Point Classification Gender Rank in Number Average Class Adam 1234 2.89 Senior Male 15 Brandon 8978 2.01 Junior Male 25 Jason 6578 3.97 Freshman Male 3 Marissa 2345 3.98 Sophomore Female 2 Michelle 8901 2.67 Senior Female 18 Wendy 7789 4.00 Senior Female 1 Webster 6780 3.77 Freshman Male 4 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 portion of the population selected to represent the population is called

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 24 years. This is an example of

The process of capturing, storing, and maintaining data is known as

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

Data

Which of the following is the correct number of classes in a frequency distribution?

Some hotels ask their guests to rate the hotel's services as excellent, very good, good, and poor. This is an example of the

Categorical data

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 1 2 3 4 5 strongly agree moderately agree neutral moderately disagree strongly disagree " -Refer to Exhibit 1-4. How many elements are in the above data set?

Which scale of measurement can be either numeric or nonnumeric?

The summaries of data, which may be tabular, graphical, or numerical, are referred to as

In a sample of 400 students in a university, 80, or 20%, are Business majors. Based on the above information, the school's paper reported that "20% of all the students at the university are Business majors." This report is an example of

After graduation ceremonies at a university, six graduates were asked whether they were in favor of identified by 1) or against identified by 0) abortion. Some information about these graduates is shown below. Cradurate Sex Age Abortion Issue Class Rank Marissa F 24 1 1 Jason M 22 1 2 Wendy F 41 0 3 Edward M 38 0 20 Jennifer F 25 1 4 Tinn M 19 0 8 a. How many elements are in the data set? b. How many variables are in the data set? c. How many observations are in the data set? d. Which of the above variables Sex, Age, Abortion Issue, Class rank) are categorical and which are quantitative variables? e. Are arithmetic operations appropriate for the variable "abortion issue"?

Data obtained from a nominal scale

How many scales of measurement exist?

The following table shows the starting salaries of a sample of recent business graduates. Income In \1 ,000s Number af Graduate 15-19 40 20-24 60 25-29 80 30-34 18 35-39 2 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?

In Excel, a worksheet that displays the formulas used to create the results is a

Temperature is an example of a variable that uses

In a questionnaire, respondents are asked to mark their gender as male or female. Gender is an example of a