Exam 3: Numerical Descriptive Measures

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 standard deviation of the carbohydrate amounts is_____grams.

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,what is the sample covariance between the DJIA and the S&P 500 index?

In right-skewed distributions,which of the following is the correct statement?

Which of the following is sensitive to extreme values?

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 determine the first quartile of the ages of the senior citizens.

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,what type of shape does the distribution of the sample appear to have?

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 3-5,construct a boxplot for the rate of return.

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

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

SCENARIO 3-6 The rate 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 Scenario 3-6,compute the arithmetic mean rate of return per year.

The rate of return for a stock over a three-year period is 0.527,0.145,and 0.684.The geometric mean rate of return is_____ .

The interquartile range is a measure of central tendency in a set of data.

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

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 3-5,what is the shape of the distribution for the rate of return?

SCENARIO 3-8 The period from 2010 to 2013 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 2010 to 2013. -Referring to Scenario 3-8,calculate the geometric mean rate of return per year for Company C.

The median of a data set with 20 items would be the average of the 10th and the 11th items in the ordered array.

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,is the change in the cost leptokurtic or platykurtic?

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.

If the arithmetic mean of a numerical data set is greater than the median,the data are_____skewed.

In left-skewed distributions,which of the following is the correct statement?