Kittens In a litter of seven kittens, three are female. You pick two kittens at random. a) Create a probability model for the number of male kittens you get. b) Whats the expected number of males? c) Whats the standard deviation?

STAT 2004 Week 2 Lecture 4 Wed. 01/25/17 Causation: one variable causes or creates the change in another variable Simple random sample: all observations in the sample have equal chance of being selected Survey question: what is your weight (asking football team) Create a sample frame: list of all potential respondents (list of all 116 players) ID Weight -randomly select 5 values (n=5) 1 118 76,114,90,91,108 2 230 -obtain data from those 5 values 3 211 116 200 X76283 X 114284 X =290 X =30891 108283 Population Parameter of interest: mean weight ( weight) Estimate: sample statistic 283+284+308+293+283 ^=