Exam 3: Graphical Descriptive Techniques 2

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.

If the data in a scatter diagram is scattered completely at random,what do you conclude?

Which of the following statements is true?

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

Experience shows that few students hand in their statistics exams early; most prefer to hand them in near the end of the test period.This means the time taken by students to write exams is positively skewed.

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?

Time series data are often graphically depicted on a(n)____________________,which is a plot of the variable of interest over time.

The sum of relative frequencies in a distribution always equals 1.

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

Briefly explain the difference between correlation and causation in terms of a relationship between X and Y.

Time-series data are often graphically depicted how?

Which of the following statements illustrates graphical deception?

A histogram is said to be ____________________ if,when we draw a vertical line down the center of the histogram,the two sides are identical in shape and size.

{Teachers Ages Narrative} Draw a frequency histogram of this data which contains four classes.What is the shape of the histogram?

A professor examines the relationship between minutes studying and exam score (out of 200 points)for a random sample of his students.The scatter diagram is shown below.It appears that study time has somewhat of a positive linear relationship with exam score.

Samantha recorded her amount of exercise time (in minutes)for 100 days.Both of the line charts below were created based on her same data set.Which line chart makes her exercise times look more variable and why?

The sum of the relative frequencies for all classes in a histogram always equals

The effect of making the slope of a line chart appear steeper can be created by:

Pie charts only show ____________________,not ____________________.This means you don't know what the sample size is unless it is stated on the pie chart.

Which of the following represents a graphical presentation of interval data?