Questions from Statistics Principles

Q: Approximately 40% of the Wisconsin population have type 0 blood.

Approximately 40% of the Wisconsin population have type 0 blood. If 4 persons are selected at random to be donors, find P [ at least one type O ] .

Q: An accountant screens large batches of bills according to the following sampling

An accountant screens large batches of bills according to the following sampling inspection plan. She inspects 4 bills chosen at random from each batch and p asses the batch if, among the 4, none is i...

Q: The following data represent the scores of 40 students on a college

The following data represent the scores of 40 students on a college qualification test (courtesy of R. W. Johnson). Make a stem-and-leaf display.

Q: In 80% of the cases an electronic scanner is successful in

In 80% of the cases an electronic scanner is successful in detecting flaws in a material specimen. Three material specimens containing flaws will be tested with the scanner. Assume that the tests are...

Q: Refer to Exercise 4.48. Given that a landfill selected

Refer to Exercise 4.48. Given that a landfill selected at random is found to have a high concentration of mercury, what is the probability that its concentration is: (a) High in barium? (b) Low in bot...

Q: Of the patients reporting to a clinic with the symptoms of sore

Of the patients reporting to a clinic with the symptoms of sore throat and fever, 25% have strep throat, 40% have an allergy, and 10% have both. (a) What is the probability that a patient selected at...

Q: Bob, John, Linda, and Sue are the finalists in

Bob, John, Linda, and Sue are the finalists in the campus bowling tournament. The winner and the first runner-up will be sent to a statewide competition. (a) List the sample space concerning the outc...

Q: Consider tossing two fair coins and the events A: Head

Consider tossing two fair coins and the events A: Head in the first toss B: Head in the second toss C: Both heads or both tails in the two tosses (a) Verify that the property of independence holds for...

Q: Repeat Example 20 but change P(A I B) to

Repeat Example 20 but change P(A I B) to .03. Data from Example 20: A is the event that a person tests positive for a serious virus and B is the event that the person actually has the virus. Suppose...

Q: Carol and Karl both solve difficult computer problems that come to the

Carol and Karl both solve difficult computer problems that come to the student desk. Carol makes 60% of the repairs and Karl 40%. However, Carol's repairs are incomplete 4% of the time and Karl's are...