Exam 3: Graphical Descriptive Techniques II

Test scores The scores on a calculus test for a random sample of 40 students are as follows: -{Test Grade Narrative} Construct a relative frequency histogram for this data set and discuss its shape.

Possible methods of creating distorted impressions with bar charts include:

Consider the following cumulative frequency distribution. Fill in the frequencies for each class in the above table.

A histogram represents interval data.

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 cumulative relative frequencies always equals 1.

A(n) ____________________ is a graphical display consisting of a set of points, each point representing one variable measured along the horizontal axis, and another variable measured along the vertical axis.

Differences in the frequencies of a histogram appear to be more dramatic if you ____________________ the vertical axis.

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.

When a distribution has more values to the left and tails off to the right, it is skewed negatively.

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

The graph below is an example of a histogram.

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. -{Electronics Company Narrative} What proportion of managers supervise 3 employees?

We determine the approximate width of the classes by subtracting the smallest observation from the largest and dividing the answer by the number of ____________________.

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

A modal class in a histogram is the class that includes

Credit Hours The College of Business at The State University of California produced 3,400 credit hours during Spring Semester, 2011he number and percentage of credit hours produced by each of the four departments in the College of Business is shown below. The following three-dimensional pie chart was constructed from the table above. -{Credit Hours Narrative} In what way does the original three-dimensional pie chart distort the data, compared to a two-dimensional pie chart?

According to the stem-and-leaf plot below, this data set has a negative median.

Compare the two histograms below.Which statement is true?

Home Care Data are collected on the number of house calls (x) made in a given week by each of 60 nurses in a certain hospital.The same data set is displayed in each of the three histograms below. -{Home Care Narrative} Which histogram makes the differences in the house calls appear to be the least dramatic?