Exam 3: Graphical Descriptive Techniques II

If the form of the graph replaces the substance of the data,the graph is performing to function and graphical excellence is achieved.

An individual's income depends somewhat on their number of years of education.Accordingly,we identify income as the ____________________ variable,and years of education as the ____________________ variable.

The relative frequency of a class in a histogram is computed by

The original observations cannot be determined once they are grouped into a frequency distribution.

Which of the following describes an ogive?

Electronics Company At a meeting of regional offices managers of a national electronics company,a survey was taken to determine the number of employees the regional managers supervise in the operation of their departments.The results of the survey are shown below. Number of emplayees supervised 1 2 3 4 5 Frequency 7 11 14 10 -{Electronics Company Narrative} Across all of the regional offices,how many total employees were supervised by those surveyed?

The number of crimes per capita is known as the crime ____________________.It is a fairer way to represent and compare crimes from year to year or place to place.

Compare the two histograms below.Which statement is true?

Electronics Company At a meeting of regional offices managers of a national electronics company,a survey was taken to determine the number of employees the regional managers supervise in the operation of their departments.The results of the survey are shown below. Number of emplayees supervised 1 2 3 4 5 Frequency 7 11 14 10 -{Electronics Company Narrative} How many regional offices are represented in the survey results?

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

The two most important characteristics to look for in a scatter diagram are the ____________________ and ____________________ of the linear relationship.

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

What type of graph depicts the data below?

Test scores The scores on a calculus test for a random sample of 40 students are as follows: 63 74 42 65 51 54 36 56 68 57 62 64 76 67 79 61 81 77 59 38 84 68 71 94 71 86 69 75 91 55 48 82 83 54 79 62 68 58 41 47 -{Test Grades Narrative} Construct frequency and relative frequency distributions for this data set using seven class intervals.Describe the shape of the data set.

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

The two most important characteristics revealed by the scatter diagram are the strength and direction of the linear relationship.

According to the stem-and-leaf plot below,the median quiz score for this data set is 8. Stem-and-leaf of Quiz Score; =75 Leaf Unit = 1 9 14 21 26 33 (8) 34 27 19 10 0 0 1 1 2 2 3 3 4 4 000112333 56899 0000123 66699 3334445 66677888 0023344 56669999 000122233 5556667799

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

Thirty 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?

The techniques of shrinking the horizontal axis or stretching the vertical axis have the effect of making the slope of the graph visually (but not numerically)steeper.