Exam 2: Descriptive Statistics and Analytics: Tabular and Graphical Methods

When looking at the shape of the distribution using a histogram, a distribution is skewed to the right when the left tail is shorter than the right tail.

The proportion of measurements in a class is called the ________ of that class.

A histogram that has a longer tail extending toward larger values is ________.

When data are qualitative, the bars should never be separated by gaps.

All of the following are used to describe quantitative data except the ________.

The following is a relative frequency distribution of grades in an introductory statistics course. If this was the distribution of 200 students, find the frequency of failures.

Which of the following graphs is for qualitative data?

A local electronics retailer recently conducted a study on purchasers of large screen televisions. The study recorded the type of television and the credit account balance of the customer at the time of purchase. They obtained the following results. What percentage of purchases were plasma televisions by customers with the smallest credit balances?

A ________ displays the frequency of each class with qualitative data and a ________ displays the frequency of each class with quantitative data.

A bar chart is a graphic that can be used to depict qualitative data.

When we wish to summarize the proportion (or fraction) of items in a class, we use the frequency distribution for each class.

The number of items rejected daily by a manufacturer because of defects for the last 30 days are: 20, 21, 8, 17, 22, 19, 18, 19, 14, 17, 11, 6, 21, 25, 4, 19, 9, 12, 16, 16, 10, 28, 24, 6, 21, 20, 25, 5, 17, 8 Construct an ogive of the number of items rejected daily.

A local electronics retailer recently conducted a study on purchasers of large screen televisions. The study recorded the type of television and the credit account balance of the customer at the time of purchase. They obtained the following results. What percentage of the customers had the highest credit balances and purchased an LCD television?

When developing a frequency distribution, the class (group) intervals must be ________.

Which of the following tools used by graphical descriptive analytics will show variation over time?

A company's Chief Operating Officer (COO) keeps track of the mileage on her trips from her office at corporate headquarters to the company's off-site manufacturing facility and its nearby suppliers. The stem-and-leaf display of the data for one year is below. How many trips were used in this display?

A(n) ________ can be used to differentiate the "vital few" causes of quality problems from the "trivial many" causes of quality problems.

Which of the following graphical tools is not used to study the shapes of distributions?

The stem-and-leaf display is advantageous because it allows us to actually see the measurements in the data set.

Data drill down is a form of data discovery.