What key factor helps explain why populations across the northern hemisphere from Europe to Asia succumbed to the bubonic plague in such large numbers as the disease migrated across the continent’s trade routes beginning in the 1340s?

The Aztecs were great American empire builders, eventually ruling more than 25 million people, but what reason often fueled their aggressive expansionism and earned them long-lasting enmity from many of the peoples they conquered?

Compute the linear correlation coefficient between the two variables and determine whether a linear relation exists.The table shows the number of days off last year and the earnings for the year (in thousands of dollars) for nine randomly selected insurance salesmen.Critical Values (CV) for correlation coefficientn3456789101215CV0.9970.9500.8780.8110.7540.7070.6660.6320.5760.514

Determine whether the underlined value is a parameter or a statistic.33.2% of the city commissioners of cities in a certain state are from minority groups.

Provide an appropriate response.Compute the coefficient of correlation, r, letting Row 1 represent the x-values and Row 2 represent the y-values. Then, compute the coefficient of correlation, r, letting Row 2 represent the x-values and Row 1 represent the y-values. What effect does switching the explanatory and response variables have on the linear correlation coefficient? ___________________________________________________________________________________________

Find the lifetime cutoff for the longest-lasting 10% of components. Show your calculator function and inputs. Round your answer to the nearest hour.

A college wants to survey 50 of its 2,000 students about campus dining. Which method produces a simple random sample (SRS) of 50 students?

Upload a scan of your ORGANIZED work page for the FREE RESPONSE questions of this exam. Upload as a JPG, PNG, PDF or DOCX file.

Marcus has the higher GPA. Does he also have the higher standing relative to students at his own school? Explain using the z-scores.

Identify one potential confounding variable. Explain how it could be related to both tutoring attendance and course grades.