Exam 3: Numerical Descriptive Measures

TABLE 2-18 The stem-and-leaf display below shows the result of a survey of 50 students on their satisfaction with their school,with the higher scores representing a higher level of satisfaction. -True or False: Referring to Table 2-18,the level of satisfaction is concentrated around 75.

True or False: A histogram can have gaps between the bars,whereas bar charts cannot have gaps.

TABLE 2-6 A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying,and whether they did well or poorly on the midterm.The following table contains the result. -Referring to Table 2-6,of those who went bar hopping the weekend before the midterm in the sample,________ percent of them did well on the midterm.

TABLE 2-18 The stem-and-leaf display below shows the result of a survey of 50 students on their satisfaction with their school,with the higher scores representing a higher level of satisfaction. -True or False: Given below is the scatter plot of the market value (thousands$)and profit (thousands$)of 50 U.S.companies.There appears to be a negative relationship between market value and profit.

According to the Chebyshev rule,at least 75% of all observations in any data set are contained within a distance of how many standard deviations around the mean?

TABLE 2-15 The figure below is the ogive for the amount of fat (in grams)for a sample of 36 pizza products where the upper boundaries of the intervals are: 5,10,15,20,25,and 30. -Referring to Table 2-15,what percentage of pizza products contains between 10 and 25 grams of fat?

TABLE 2-18 The stem-and-leaf display below shows the result of a survey of 50 students on their satisfaction with their school,with the higher scores representing a higher level of satisfaction. -True or False: Some business analytics are performed by adding variables to see if unforeseen relationships are uncovered.

TABLE 2-14 The table below contains the number of people who own a portable Blu-ray player in a sample of 600 broken down by gender. -Referring to Table 2-14,if the sample is a good representation of the population,we can expect ________ percent of the males in the population will own a portable Blu-ray player.

According to the empirical rule,if the data form a "bell-shaped" normal distribution,________ percent of the observations will be contained within 3 standard deviations around the arithmetic mean.

TABLE 2-13 Given below is the stem-and-leaf display representing the amount of detergent used in gallons (with leaves in 10ths of gallons)in a day by 25 drive-through car wash operations in Phoenix. -Referring to Table 2-13,if a frequency distribution for the amount of detergent used is constructed,using "9.0 but less than 10.0 gallons" as the first class,the frequency of the "11.0 but less than 12.0 gallons" class would be ________.

TABLE 2-13 Given below is the stem-and-leaf display representing the amount of detergent used in gallons (with leaves in 10ths of gallons)in a day by 25 drive-through car wash operations in Phoenix. -Referring to Table 2-13,if a percentage histogram for the detergent data is constructed,using "9.0 but less than 10.0 gallons" as the first class,what percentage of drive-through car wash operations use less than 12 gallons of detergent in a day?

True or False: The stem-and-leaf display is often superior to the frequency distribution in that it maintains the original values for further analysis.

TABLE 2-8 The Stem-and-Leaf display represents the number of times in a year that a random sample of 100 "lifetime" members of a health club actually visited the facility. -Referring to Table 2-8,________ of the 100 members visited the health club at least 52 times in a year.

TABLE 2-13 Given below is the stem-and-leaf display representing the amount of detergent used in gallons (with leaves in 10ths of gallons)in a day by 25 drive-through car wash operations in Phoenix. -Referring to Table 2-13,construct a cumulative percentage distribution for the detergent data if the corresponding frequency distribution uses "9.0 but less than 10.0" as the first class.

True or False: If you wish to construct a graph of a relative frequency distribution,you would most likely construct an ogive first.

In a contingency table,the number of rows and columns

Which of the arithmetic mean,median,mode,and geometric mean are resistant measures of central tendency?

TABLE 2-14 The table below contains the number of people who own a portable Blu-ray player in a sample of 600 broken down by gender. -Referring to Table 2-14,if the sample is a good representation of the population,we can expect ________ percent of the population will be males.

TABLE 2-18 The stem-and-leaf display below shows the result of a survey of 50 students on their satisfaction with their school,with the higher scores representing a higher level of satisfaction. -True or False: Some business analytics involve starting with many variables and are then followed by filtering the data by exploring specific combinations of categorical values or numerical range.In Excel,this approach is mimicked by using a drill-down.

You have collected data on the number of complaints for 6 different brands of automobiles sold in the United States over a 10-year period.Which of the following is the best for presenting the data?