Exam 2: Graphical and Tabular Descriptive Techniques

In applications involving two variables, X and Y , where one variable depends to some degree on the other, we call Y the ____________________ variable.

Observations that are taken during successive points in time are called ____________________ data.

Test Grades The scores on a calculus test for a random sample of 40 students are as follows: {Test Grades Narrative} Construct a stem-and-leaf display for this data set. Describe the shape of the data.

The graphical technique used to describe the relationship between two interval variables is the scatter diagram.

What type of graph depicts the data below?

Time-series data are often graphically depicted how?

It is speculated that the number of police officers has a negative linear relationship with number of crimes. Explain why this might be so.

All calculations are permitted on interval data.

Time series data are often graphically depicted on a line chart, which is a plot of the variable of interest over time.

The final grade received in a Literature course (A, B, C, D, or F)is an example of a(n)____________________ variable.

A(n)____________________ is created by plotting the value of the variable on the vertical axis and the time periods on the horizontal axis.

Which of the following statements about histograms is false?

Provide one example of ordinal data; one example of nominal data; and one example of interval data.

An economics professor wants to study the relationship between income and education. A sample of 10 individuals is selected at random, and their income (in thousands of dollars)and education (in years)are shown below: a. Draw a scatter diagram for these data with the income on the vertical axis. b. Describe the relationship between income and education.

The sum of cumulative relative frequencies always equals 1.

In a histogram a(n)____________________ class is the one with the largest number of observations.

Internet Classes A survey of 25 students was conducted to determine how they rate the quality of Internet classes. Students were asked to rate the overall quality from 0 (no quality at all)to 100 (extremely good quality). The stem-and-leaf display of the data is shown below. Stem Leaves 3 15 4 01457889 5 0134677 6 24568 7 29 8   9 5 {Internet Classes Narrative} What percentage of the students rated the overall quality of Internet classes as being 70 or above?

A supermarket's monthly sales (in thousands of dollars)for the last year were as follows: Construct a relative frequency bar chart for this data set. How many observations are there in this data set?

In purchasing an automobile, there are a number of variables to consider. The body style of the car (sedan, coupe, wagon, etc.)is an example of a(n)____________________ variable.

The relationship between two interval variables is graphically displayed by a