Exam 3: Numerical Descriptive Measures

Which descriptive summary measures are considered to be resistant statistics?

A population with 200 elements has an arithmetic mean of 10.From this information,it can be shown that the population standard deviation is 15.

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

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,identify which of the following is the correct statement.

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 first quartile of the carbohydrate amounts is ________ grams.

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

TABLE 3-12 Given below are the rating and performance scores of 15 laptop computers. -Referring to Table 3-12,how will you classify the linear relationship between the performance scores and the rating?

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 greater than -3.

In perfectly symmetrical distributions,which of the following is not a correct statement?

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,construct a boxplot for the carbohydrate amounts.

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

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 median carbohydrate amount in the cereal is ________ grams.

TABLE 3-9 The following table represents the assets in billions of dollars of the five largest bond funds. -Referring to Table 3-9,what are the variance and standard deviation for this population?

Which of the following is the easiest to compute?

Which of the following statistics is not a measure of central tendency?

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 range of the customs data is ________.

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,construct a boxplot of this sample.

The smaller the spread of scores 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 C.

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 five-number summary of the change in the cost?