Exam 2: Descriptive Statistics: Tabular and Graphical Methods

The US local airport keeps track of the percentage of flights arriving within 15 minutes of their scheduled arrivals.The stem-and-leaf plot of the data for one year is below: What would be the class length for creating the frequency histogram?

822 customers were randomly selected from those who had recently bought a book over the internet.The chart below shows the breakdown of the classification of the book type: What percentages of books were in the top two categories?

If there are 30 values in a data set,how many classes should be created for a frequency histogram?

Consider the following data: Create a stem and leaf display for the sample. Stem and leaf of C1,N = 20 Leaf Unit = 0.10

The 550 students answered an additional question with the following results based on their rating of their instructor: What proportion of all 550 students received less than a C?

The following is a relative frequency distribution of grades in an introductory statistics course. If this was the distribution of 200 students,give the frequency distribution for this data:

Row or column percentages can be found in:

A histogram that tails out towards smaller values is _____.

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below: 24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50 How many classes should be used in the construction of a histogram?

A histogram that tails out towards larger values is _____.

Using the following data,describe the shape of the data distribution.

Recently an advertising company called 200 people and asked to identify the company that was in an ad running nationwide.The following results were obtained: What percentage of those surveyed were female and could not recall the company?

A graphical portrayal of a data set that divides the data into classes and gives the frequency of each class is a(n)_____.

________ can be used to study the relationship between two variables.

A plot of the values of two variables is a _____ plot.

The US local airport keeps track of the percentage of flights arriving within 15 minutes of their scheduled arrivals.The stem-and-leaf plot of the data for one year is below: How many flights were used in this plot?

A company collected the ages from a random sample of its middle managers with the resulting frequency distribution shown below: What would be the approximate shape of the relative frequency histogram?

The 550 students answered an additional question with the following results based on their rating of their instructor: What proportion of the students who rated their instructor as very or somewhat effective received a B or better in the class?

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:

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below: 24,56,43,35,37,27,29,44,34,28,33,28,46,31,38,41,48,38,27,29,37,33,31,40,50 Construct a histogram