You want to know how many columbia students own a dog. you survey 49 students and find that 36 of them own a dog. what would your 90% confidence interval be for the true mean of columbia students who own a dog? if you repeated this survey 100 times how many times would you expect to capture the true mean in your 90% confidence interval? in your above survey every time a student had a dog you asked the for the dog weight. from your 36 responses you got an average weight of 25 lbs with a standard deviation of 8 lbs. build a 99% confidence interval for the estimate of the average weight of a dog owned by a columbia student. say your roommate says that she has a dog and will make you 9: 1 odds if you can guess her dog's weight to within +/- a set amount. what set amount would you ask her for to make the game fair (expected value 0). e. g. if you set the confidence interval to be 1 standard deviation you will guess correctly roughly 2/3 of the time.