# STAT 101 Chapter Notes - Chapter 13: Binomial Distribution, Blood Type Personality Theory, Opinion Poll

## Document Summary

Each child has probability of 0. 25 of having type blood o. If a pair of parents have 5 children, the number who have blood type o is the count x of successes in 5 independent observations w/ 0. 25 probability of success. So x has the binomial distribution, n = 5 and p = 0. 25. Music inspector inspects srs of 10 cds from shipment of 10,000 cds. Suppose 10% of the cds in shipment are defective. Count the number of x of bad cds in sample. Sampling distribution of a count: choose an srs of size n from a population w/ proportion p of successes. When population much larger than sample, the count x of successes in sample has approx the binomial distribution w/ parameters n and p. Ex 13. 1) opinion poll calls residential telephon numbers @ random, only 20% of calls reach a live person. You watch random sampling machine make 15 calls.