of 1,000,000 potential customers.  Your marketing department has segmented/stratified this market as follows: 400,000 are college graduates. 100,000 have graduate degrees. 300,000 have some college credits. 200,000 have high school diplomas.   Your company wants to take a proportional stratified probability sample to assess the percentage of people who will favor a certain issue. You have no idea what this percentage might actually be. Furthermore, you want to measure this percentage with 95% confidence and a margin of error of 7%. Answer the following: How many total samples should be selected? What should be the consideration in deciding to select a stratified

The U.S. Coast Guard maintains a database of the number, source, and location of oil spills in the U.S. navigable and territorial waters. The following is a probability distribution for location of oil spill events. [Source: Statistical Abstract of the United States.]   Location Probability Atlantic Ocean 0.008 Pacific Ocean 0.037 Gulf of Mexico 0.233 Great Lakes 0.020 Other Lakes 0.002 Rivers and canals 0.366 Bays and sounds 0.146 Harbors 0.161 Other 0.027   If an oil spill is selected at random from the database, what is the probability:   The oil spill occurred in an ocean?         The oil spill occurred in a lake or harbor?         The oil spill did not occur in a lake, ocean, river, or canal?

What is the probability of selecting a veteran that lives in your city given they live in your states? State population: 28,995,881 City population: 978,908 Veteran population: 36,094 Country population: 328,239,523

A mechanical press is used to mold shapes for plastic toys. When the machine is adjusted and working well, it still produces about 6% defective toys.  The toys are manufactured in lots of 100.  What is the probability that the percent of defective toys is 11% or more?