Exam 3 for Introductory Statistics Prof. Bernardo brego Math 140, Spring 2006 Summary: Exam 3 for Introductory Statistics Prof. Bernardo Ábrego Math 140, Spring 2006 Name. 05/04/06 Directions. · You have 1 hour and 50 minutes to complete the test. · You can use a 3"×5" card with notes, your calculator, and the z-tables provided on the back of this test. No other materials are allowed. · No scratch paper is permitted. For this purpose or in case you need more space you can use the back of the pages of the test. 1. A recent study of 100 people in Miami found 27 were obese. Find the 99% confidence interval of the population proportion of individuals living in Miami who are obese. n = 100 is the sample size, ^p = 27/100 = 0.27 is the sample proportion. For 99% confidence we use z = 2.576. So the interval is given by ^p ± z q ^p(1-^p) n which gives, (0.15564, 0.38436) 2. A university dean of students wishes to estimate with 95% confidence the average number of hours students spend doing homework per week. It has been estimated that the population standard deviation Collections: Mathematics