Introduction to the Practice of Statistics 9th edition by David S. Moore Test bank
43.The histogram below shows data from 30 students who were asked, “How much time do you spend on the Internet in minutes?” What are some features about the data?
A)There is a potential outlier.
B)Most values are around 800.
C)The range of values is between 0 and 400.
D)None of the above
44.The appearance of a histogram will change when you _______.
A)change the class size
B)add more data
C)remove outliers
D)All of the above
45.The tails of a distribution show the _______.
A)center
B)extreme values
C)median
D)None of the above
46.When using a histogram to display categorical values, you should make sure the categories are in alphabetical order.
A)True—histograms are not useful if the categories are not in order.
B)True—histograms can be used on any type of data.
C)False—You cannot use histograms to display categorical data.
D)False—The categories cannot be in alphabetical order when displaying categorical data.
47.When displaying the distribution of quantitative data, it is best to use
A)pie charts.
B)bar graphs.
C)histograms.
D)stemplots or histograms.
48.A sample of employees of a large pharmaceutical company has been obtained. The length of time (in months) they have worked for the company was recorded for each employee. A stemplot of these data is shown below. In the stemplot 6|2 represents 62 months.
What would be a better way to represent this data set?
A)Display the data in a time plot.
B)Display the data in a boxplot.
C)Split the stems.
D)Use a histogram with class width equal to 10.
49.Data are collected from 1100 randomly selected students who graduated between 2005 and 2008 from the University of Florida. Some of the variables that were collected are listed below. Identify each of the following variables as categorical or quantitative.
A) Gender of the student
B) School/college from which the student graduated
C) Annual salary of the first job after graduation
D) Graduation date in terms of semester (e.g., Fall 2005, Spring 2006, etc.)
50.Data are collected from 1100 randomly selected students who graduated between 2005 and 2008 from the University of Florida. A pie chart of the departments in the school/college from which the 1100 sampled students graduated is shown below.
Based on the graph, (approximately) how many of the sampled students graduated with a degree in Building/Construction or Architecture?
A)55
B)59
C)65
D)99
51.A distributor of electronics is doing a customer satisfaction survey for a manufacturer of tablet computers. A sample of 68 clients is asked to rate a particular tablet on appearance, functionality, ease of use, and price on a scale of 1 to 10, where 1 corresponds to the worst rating and 10 to the best possible rating. A bar graph of the ease of use ratings classified by gender is given below.
What percentage of the sampled female clients rated the tablet as not so easy to use (a rating of 4 or lower)?
A)28%
B)29%
C)38%
D)62%
52.When drawing a histogram, it is important to
A)have a separate class interval for each observation to get the most informative plot.
B)make sure the heights of the bars exceed the widths of the class intervals, so that the bars are true rectangles.
C)label the vertical axis so the reader can determine the counts or percentage in each class interval.
D)make certain the mean and median are contained in the same class interval, so that the correct type of skewness can be identified.
53.In a statistics class with 136 students, the professor records how much money each student has in their possession during the first class of the semester. The histogram shown below represents the data he collected.
What is approximately the percentage of students with under $10 in their possession?
A)35%
B)40%
C)44%
D)50%
54.In a statistics class with 136 students, the professor records how much money each student has in their possession during the first class of the semester. The histogram shown below represents the data he collected.