statistics

The table shown gives the national average pupil-teacher ratio in public schools over Year m selected years. 199] V a. Find the equation for the least squares line Let x correspond to the number ofyears since 1991 and let y correspond to the average number of pupils per 1 teacher 1993 b Use the answer from part (a) to predict the pupil-teacher ratio in 2020 Does this 1995 IEI seem realistic? 199? c Calculate and interpret the correlation coefcient 1999 m a. The equation for the least squares line is Y: b. Using the answer from part (a), the pupil-teacher ratio in 2020 will be C. The correlation coefficient is which indicates a strong linear correlation. The total amount of consumer credit has been increasing steadily in recent years The following table gives the total outstanding consumer credit (in billions of dollars) Answer parts (a) through (9) below Year Consumer Year Consumer D Credit Credit 2551 s 2643 1 2759 0 2926 3 309? 2 a. Find an equation for the least squares line, letting x equal the number of years since 2001? b. Based on the answer to part (a), at approximately what rate is consumer credit growing per year? c. Use the result from part (a) to predict the amount of consumer credit in the year 2017? d. If this trend continues linearly, in what year will the total debt first exceed $4000 billion? e. Find and interpret the correlation coefficient The correlation coefficient is which indicates a strong linear correlation 4}