Exam 3: Numerical Descriptive Measures

SCENARIO 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 Scenario 3-13,what is the sample correlation coefficient between the exam scores and the number of energy drinks consumed?

SCENARIO 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 Scenario 3-2,is the carbohydrate amount in the cereal right- or left-skewed?

SCENARIO 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 Scenario 3-7,what is the five-number summary of the change in the cost?

SCENARIO 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 Scenario 3-3,the third quartile of the number of vitamin supplements sold in this sample is_____ .

SCENARIO 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 Scenario 3-1,calculate the variance of the ages of the senior citizens correct to the nearest hundredth of a year squared.

SCENARIO 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 Scenario 3-2,the five-number summary of the carbohydrate amounts consists of _____,_____,_____,_____,_____.

When extreme values are present in a set of data,which of the following descriptive summary measures are most appropriate:

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

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

In a perfectly symmetrical distribution

According to the empirical rule,if the data form a "bell-shaped" normal distribution,percent of the observations will be contained within 1 standard deviation around the arithmetic mean.

SCENARIO 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 sometime in the past. -Referring to Scenario 3-11,how will you classify the linear relationship between the DJIA and the S&P 500 index?

Data on the change in the cost of tuition,a shared dormitory room,and the most popular meal plan from one academic year to the next academic year for a sample of 100 public universities are collected.Below is the boxplot for the change in cost in dollars.The distribution of the change in cost is

SCENARIO 3-5 The rate 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 Scenario 3-4,the five-number summary for the data in the customs sample consists of_____ ,_____,_____,_____,_____.

The line drawn within the box of the boxplot always represents the arithmetic mean.

SCENARIO 3-9 The following table represents the assets in billions of dollars of the five largest bond funds sometime in the past. -Referring to Scenario 3-9,what is the mean for this population of the five largest bond funds?

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

SCENARIO 3-12 Given below are the rating and performance scores of 15 laptop computers. -Referring to Scenario 3-12,you will expect a decrease in the performance score of one laptop computer to be associated with

The coefficient of variation is a measure of relative variation.

As a rule,a value is considered an extreme value if its Z score is less than -3.