Question 1
It takes a while for new factory workers to master a complex assembly process. During the first month new employees work, the company tracks the number of days they have been on the job and the length of time it takes them to complete an assembly. The correlation is most likely to be
◦ near 0
◦ near -0.6
◦ exactly +1.0
◦ exactly -1.0
◦ near +0.6
Question 2
For families who live in apartments the correlation between the family's income and the amount of rent they pay is
r = 0.60. Which is true?
I. In general, families with higher incomes pay more in rent.
II. On average, families spend 60% of their income on rent.
III. The regression line passes through 60% of the (income$, rent$) data points.
◦ I and III only
◦ I and II only
◦ II only
◦ I only
◦ I, II, and III