Exam 3: Numerical Descriptive Measures

TABLE 3-7 In a recent academic year,many public universities in the United States raised tuition and fees due to a decrease in state subsidies.The change in the cost of tuition,a shared dormitory room,and the most popular meal plan from the previous academic year for a sample of 10 public universities were as follows: $1,589,$593,$1,223,$869,$423,$1,720,$708,$1425,$922 and $308. -Referring to Table 3-7,what is the standard deviation of the change in the cost?

Which measure of central tendency can be used for both numerical and categorical variables?

According to the Chebyshev rule,at least what percentage of the observations in any data set are contained within a distance of 2 standard deviations around the mean?

TABLE 3-1 Health care issues are receiving much attention in both academic and political arenas.A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for Medicaid.The ages of 25 senior citizens were as follows: -Referring to Table 3-1,determine which of the following is the correct statement.

TABLE 3-5 The rates of return of a Fortune 500 company over the past 15 years are: 3.17%,4.43%,5.93%,5.43%,7.29%,8.21%,6.23%,5.23%,4.34%,6.68%,7.14%,-5.56%,-5.23%,-5.73%,-10.34% -Referring to Table 3-5,what is the range of the rate of return?

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 3-8 The time period from 2006 to 2009 saw a great deal of volatility in the value of stocks.The data in the following table represent the total rate of return of our companies from 2006 to 2009. -Referring to Table 3-8,calculate the geometric mean rate of return per year for Company A.

TABLE 3-2 The data below represent the amount of grams of carbohydrates in a serving of breakfast cereal in a sample of 11 different servings. 11 15 23 29 19 22 21 20 15 25 17 -Referring to Table 3-2,the variance of the carbohydrate amounts is ________ (grams squared).

TABLE 3-12 Given below are the rating and performance scores of 15 laptop computers. -Referring to Table 3-12,what is the sample correlation coefficient between the performance scores and the rating?

TABLE 3-4 The ordered array below represents the number of cargo manifests approved by customs inspectors of the Port of New York in a sample of 35 days: 16,17,18,18,19,20,20,21,21,21,22,22,22,22,23,23,23,23,24,24,24,25,25,26,26,26,27,28,28,29,29,31,31,32,32 Note: For this sample,the sum of the values is 838,and the sum of the squared differences between each value and the mean is 619.89. -Referring to Table 3-4,the standard deviation of the customs data is ________.

The geometric mean is a measure of variation or dispersion in a set of data.

TABLE 3-2 The data below represent the amount of grams of carbohydrates in a serving of breakfast cereal in a sample of 11 different servings. 11 15 23 29 19 22 21 20 15 25 17 -Referring to Table 3-2,the standard deviation of the carbohydrate amounts is ________ grams.

TABLE 3-1 Health care issues are receiving much attention in both academic and political arenas.A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for Medicaid.The ages of 25 senior citizens were as follows: -Referring to Table 3-1,determine the interquartile range of the ages of the senior citizens.

TABLE 3-6 The rates of return of an Internet Service Provider over a 10 year period are: 10.25%,12.64%,8.37%,9.29%,6.23%,42.53%,29.23%,15.25%,21.52%,-2.35%. -Referring to Table 3-6,construct a boxplot for the rate of return

TABLE 3-3 The ordered array below represents the number of vitamin supplements sold by a health food store in a sample of 16 days. 19,19,20,20,22,23,25,26,27,30,33,34,35,36,38,41 Note: For this sample,the sum of the values is 448,and the sum of the squared differences between each value and the mean is 812. -Referring to Table 3-3,the third quartile of the number of vitamin supplements sold in this sample is ________.

TABLE 3-1 Health care issues are receiving much attention in both academic and political arenas.A sociologist recently conducted a survey of citizens over 60 years of age whose net worth is too high to qualify for Medicaid.The ages of 25 senior citizens were as follows: -Referring to Table 3-1 determine the third quartile of the ages of the senior citizens.

TABLE 3-13 Energy drink consumption has continued to gain in popularity since the 1997 debut of Red Bull,the current leader in the energy drink market.Given below are the exam scores and the number of 12-ounce energy drinks consumed within a week prior to the exam of 10 college students. -Referring to Table 3-13,you will expect a decrease in the amount of energy drink consumed within the week prior to the exam to be associated with

TABLE 3-6 The rates of return of an Internet Service Provider over a 10 year period are: 10.25%,12.64%,8.37%,9.29%,6.23%,42.53%,29.23%,15.25%,21.52%,-2.35%. -As a general rule,a value is considered an extreme value if its Z score is less than -3.

TABLE 3-4 The ordered array below represents the number of cargo manifests approved by customs inspectors of the Port of New York in a sample of 35 days: 16,17,18,18,19,20,20,21,21,21,22,22,22,22,23,23,23,23,24,24,24,25,25,26,26,26,27,28,28,29,29,31,31,32,32 Note: For this sample,the sum of the values is 838,and the sum of the squared differences between each value and the mean is 619.89. -Referring to Table 3-4,the interquartile range of the customs data is ________.

TABLE 3-8 The time period from 2006 to 2009 saw a great deal of volatility in the value of stocks.The data in the following table represent the total rate of return of our companies from 2006 to 2009. -Referring to Table 3-8,calculate the geometric mean rate of return per year for Company D.