Exam 2: Graphical Descriptive Techniques I

Twenty-five voters participating in a recent election exit poll in Minnesota were asked to state their political party affiliation.Coding the data as R for Republican,D for Democrat,and I for Independent,the data collected were as follows: I,R,D,I,R,I,I,D,R,I,I,D,R,R,I,D,I,R,I,D,I,D,R,R,and I.Construct a frequency bar chart from this data.What does the bar chart tell you about the political affiliations of those in this sample?

Suppose you measure the number of minutes it takes an employee to complete a task,where the maximum allowed time is 5 minutes,and each time is rounded to the nearest minute.Data from 130 employees is summarized below.Construct a frequency bar chart and a pie chart from this data.How long did it take most employees to complete the task? Time (minutes) 1 2 3 4 5 Frequency 15 30 40 25 20

A variable is some characteristic of a population or sample.

For which type of data are the values arbitrary numbers?

All calculations are permitted on interval data.

In the following cross-classification table,how are gender and house ownership related? Owa a house Dan't own a house Females 60 30 Males 80 40

If two bar charts made from the rows of a cross-classification table look the same,then the two nominal variables ____________________ (are/are not)related.

The values of quantitative data are categories.

If two pie charts made from the rows of a cross-classification table look the same,then the two nominal variables ____________________ (are/are not)related.

In the following cross-classification table,gender and fantasy baseball participation are related. Participate in Fantasy Football Dan't participate in Fantasy Football Males 75 25 Females 45 55

Business School Graduates A sample of business school graduates were asked what their major was.The results are shown in the following frequency distribution. Majar of Graduates Number of gradiuates Accounting 58 Finance 42 Management 38 Marketing 52 Other 10 -{Business School Graduates Narrative} How many graduates were surveyed?

For what type of data are frequencies the only calculations that can be done?

The classification of student major (accounting,economics,management,marketing,other)is an example of a(n)

With nominal data,there is one and only one way the possible values can be ordered.

You cannot calculate and interpret differences between numbers assigned to ordinal data.

A(n)____________________ distribution lists the categories of a nominal variable and the proportion with which each occurs.

When studying the responses to two nominal questions,we should develop a

A cross-classification table summarizes data from two nominal variables.

Suppose you measure the number of minutes it takes an employee to complete a task,where the maximum allowed time is 5 minutes,and each time is rounded to the nearest minute.Data from 130 employees is summarized below.How long did it take most employees to complete the task? Time (minutes) 1 2 3 4 5 Frequency 25 40 50 35 30

All-Nighters A sample of 400 students at a certain university was taken after the midterm;200 students reported staying up all night before the midterm and the other 200 students did not.Researchers recorded whether each student did well or poorly on the midterm.The following table contains the results. Did Well on Did Poorly on Midterm Midterm Stayed up all night 60 140 Did not stay up all night 120 80 -{All-Nighters Narrative} Of those who did well on the midterm,what percentage stayed up all night before the midterm?