Exam 3: Numerical Descriptive Measures

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

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...?

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. Exam Scores 75 92 84 64 64 86 81 61 73 93 Number of Drinks 5 3 2 4 2 7 3 0 1 0 -Referring to Scenario 3-13, what is the sample covariance between the exam scores and the number of energy drinks consumed?

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: 60 61 62 63 64 65 66 68 68 69 70 73 73 74 75 76 76 81 81 82 86 87 89 90 92 -Referring to Scenario 3-1, identify which of the following is the correct statement.

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

Which of the following measures is used to determine variation relative to the mean?

SCENARIO 3-10 The population of eight analysts at a software firm were asked to estimate the reuse rate when developing a new software system.The following data are given as a percentage of the total code written for a software system that is part of the reuse database. $50,62.5,37.5,75.0,45.0,47.5,15.0,25.0$ -Referring to Scenario 3-10, what is the mean percentage of the total code that is part of the reuse database?

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...?

The Z score of a value can never be negative.

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 arithmetic mean of the number of vitamin supplements sold in this sample is _.

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 interquartile range of the change in the cost?

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 between 95 and 138 lbs...?

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. Dow Jones 10,421 10,110 9,862 10,475 9,920 10,592 11,213 10,933 11,134 10,316 S\&P 500 1,379 1,356 1,343 1,410 1,389 1,463 1,529 1,499 1,516 1,355 -Referring to Scenario 3-11, for the week when the DJIA is high, you will expect the S&P index in that week to

SCENARIO 3-2 The data below represent the number of grams of carbohydrates in a serving of breakfast cereal in a sample of 11 different servings. $1115232919222120152517$ -Referring to Scenario 3-2, is the carbohydrate amount in the cereal leptokurtic or platykurtic?

In left-skewed distributions, the distance from the smallest value to Q1 is greater than the distance from Q3 to the largest value.

The line drawn within the box of the boxplot always represents the median.

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.

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?

The larger the Z score, the farther is the distance from the value to the median.

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