Exam 3: Numerical Descriptive Measures

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 interquartile range of the number of vitamin supplements sold in this sample is ________.

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 coefficient of variation of the carbohydrate amounts is ________ percent.

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%. -You were told that the 1ˢᵗ,2ⁿᵈ and 3ʳᵈ quartiles of female students' weight at a major university are 95 lbs,125 lbs,and 138 lbs.What percentage of the students weigh more than 138 lbs?

TABLE 3-11 Given below are the closing prices for the Dow Jones Industrial Average (DJIA)and the Standard & Poor's (S&P)500 Index over 10 weeks. -Referring to Table 3-11,you will expect an increase in the DJIA to be associated with

In a set of numerical data,the value for Q₃ can never be smaller than the value for Q₁.

If a set of data is perfectly symmetrical,the arithmetic mean must be identical to the median.

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%. -You were told that the 1ˢᵗ,2ⁿᵈ and 3ʳᵈ quartiles of female students' weight at a major university are 95 lbs,125 lbs,and 138 lbs.What percentage of the students weigh more than 125 lbs?

TABLE 3-11 Given below are the closing prices for the Dow Jones Industrial Average (DJIA)and the Standard & Poor's (S&P)500 Index over 10 weeks. -Referring to Table 3-11,what is the sample correlation coefficient between the DJIA and the S&P 500 index?

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,for a student who has consumed a high number of energy drinks within the week prior to the exam,you will expect his/her exam score to

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,how will you classify the linear relationship between the exam scores and the number of energy drinks consumed?

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 interquartile range in 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,calculate the coefficient of variation of the ages of the senior citizens.

If the data set is approximately bell-shaped,the empirical rule will more accurately reflect the greater concentration of data close to the mean as compared to the Chebyshev rule.