STAT 100 Midterm: STAT100 ALL-SECTIONS SPRING1997 0000 MID EXAM 5

• School: University of Maryland
• Department: Statistics and Probability
• Course: STAT 100
• Professor: All

Document Summary

You may use calculators, and one page of notes (writing allowed on both sides). Di erent parts of a problem have equal weight unless otherwise indicated. Do not spend too much time on any one problem. Put a box around the nal answer to a question: in a sample of 100 bottles of a new brand of beer, the mean alcohol content was 5. 1% with standard deviation 0. 5% . Test at = 0. 02: in a random sample of 100 new york residents, the average weekly salary is and the standard deviation is . In a random sample of 200 chicago residents, the average weekly salary is and the standard deviation is . Let n be the average weekly salary of new york residents and c be the average weekly salary of chicago residents. Find a 90% con dence interval for c n . **************there are more problems on the back side***************