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 X the ____________________ variable.

{Test Grades Narrative} Construct frequency and relative frequency distributions for this data set using seven class intervals. Describe the shape of the data set.

Twenty-five voters participating in a recent election exit poll in Alabama were asked to state their political party affiliation. Coding the data 1 for Republican, 2 for Democrat, and 3 for Independent, the data collected were as follows: 3, 1, 2, 3, 1, 3, 3, 2, 1, 3, 3, 2, 1, 1, 3, 2, 3, 1, 3, 2, 3, 2, 1, 1, 3, 1, 2, 2, 1, and 3. Develop a frequency distribution and a relative frequency distribution for this data. What does the data suggest about the strength of the political parties in Alabama?

How do you determine whether two interval variables have a positive linear relationship?

Car Buyers Forty car buyers were asked to indicate which car dealer offered the best overall service. The four choices were Contour Motors (C), Modern Chrysler (M), Tonneau Auto (T), and Uncanny Chevrolet (U). The following data were obtained: {Car Buyers Narrative} Construct a frequency bar chart of this data. Which car dealer came in last place in terms of overall service?

{Test Grades Narrative} Describe the distribution of exam scores.

The Dean of Students conducted a survey on campus. Class rank (Freshman, Sophomore, Junior, and Senior)is an example of a(n)____________________ variable.

The intervals (classes)in a histogram do not overlap.

A(n)____________________ display shows the actual observations as well as the number of observations in each class.

Which of the following statements about histograms is false?

The number of observations within each class may be found in a frequency distribution.

A relative frequency distribution describes the proportion of data values that fall within each category.

A(n)____________________ chart is not able to show frequencies. It can only show relative frequencies.

Observations that are measured at successive points in time is what type of data?

The sum of cumulative relative frequencies always equals 1.

Your age group (1-9; 10-19; 20-29; 30-39; etc.)is an interval variable.

Whether or not you are over the age of 21 is a nominal variable.

Two types of graphs that organize nominal data are ____________________ and ____________________.

Which of the following describes a positive linear relationship between X and Y ?

A category in a pie chart that contains 50% of the observations is represented by a slice of the pie that is equal to ____________________ degrees.