Stats Unit 2 Updated Questions with 100% Correct Answers | Latest & Verified

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 (r) is most likely to be.... A. exactly +1.0 B. near 0 C. near +0.6 D. exactly -1.0 E. near -0.6 - CORRECT ANSWER-E. near -0.6 b/c the longer the worker has worked = more experience = less assembly time 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? A. In general, families with higher incomes pay more in rent B. On average, families spend 60% of their income on rent C. The regression line passes through 60% of the data points - CORRECT ANSWER-A. In general, families with higher incomes pay more in rent. b/c r is + so slope is + A regression analysis of students' AP statistics test scores and the number of hours they spent doing homework found R2 = 0.32. Which of these is true? A. 32% of students test scores can be correctly predicted with this model. B. Homework accounts for 32% of your grade in AP stats. C. There's a 32% chance that you'll get the scores this model predicts for you. - CORRECT ANSWER-None b/c 32% of the variation in test scores can be accounted for by looking at homework hours. A correlation of 0 between 2 quantitative variables means that - CORRECT ANSWER-there is no linear association between the 2 variables Variables X and Y have r = 0.40. If we decrease each X value by 0., double each Y value, and then interchange then the new correclatio will be - CORRECT ANSWER-0.40 b/c r is not affecte