Exam 3: Numerical Descriptive Measures

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 are the (absolute values of)the Z scores of the change in cost?

The coefficient of variation is a measure of relative variation.

SCENARIO 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: 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 Scenario 3-4, the third quartile of the customs data is ________.

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

Which measure of central tendency can be used for both numerical and categorical variables?

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 3-13 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, you will expect a decrease in the amount of energy drink consumed within the week prior to the exam to be associated with