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19. An urban economist randomly selects 80 members of the workforce from Salt Lake City in order to estimate the average commute time to work. She calculates the 95% t condence interval to be 28.2 i 4.3 minutes. What can she say with this result? (3 pts) a. 95% of all workers in Salt Lake City have a commute time between 23.9 and 32.5 minutes. b. 95% of all workers in Salt Lake City have a commute at least 23.9 minutes. c. She is 95% condent that the true mean commute time for workers in Salt Lake City is between 23.9 and 32.5 minutes