EP BUSINESS STATISTICS:FIRST COURSE-ACC
8th Edition
ISBN: 9780135179802
Author: Levine
Publisher: PEARSON CO
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An experimenter wants to study the relationship between type of milk and infant growth in underdeveloped countries. She randomly assigns 300 infants to either a breast-feeding group or an infant formula group. She then weighs the infants every three days for the first four weeks of life.
An Jibble is produced on an assembly line consisting of six workstations. The total work content for one Jibble is 22 minutes based on the following standard times set forth for each station: 1 (4.0 minutes), 2 (6.5 minutes), 3 (4.0 minutes), 4 (2.5 minutes), 5 (2.0 minutes), 6 (3.0 minutes). If this assembly line runs 5 days per week, 8 hours per day and each station operator operates at 120% of standard, how many Jibbles can be produced in a week?
a.
Greater than or equal to 600 units.
b.
Greater than or equal to 500 units but less than 600 units.
c.
Less than 400 units.
d.
Greater than or equal to 400 units but less than 500 units.
Ten years ago, the town of Easton decided to increase its annual spending on education so that its high school graduates would be able to earn higher wages. Now Easton has asked you to evaluate the effectiveness of the spending increase. Their data show that before the spending increase, the average annual salary of recent high school graduates was $25,000 and that now that average salary has risen to $28,500. Fortunately for your analysis, a neighboring community (Allentown) did not change its annual spending on education. Ten years ago, recent Allentown high school graduates earned an average of $22,500, and now that average is $23,750.
(a) Use a difference-in-differences estimator to determine whether Easton’s spending increase caused the wages of their high school graduates to increase.
please provide an accurate answer.
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