Qnt 561 Week 1

Chapter 3

Exercise 80

A). Explain why the times are a population.

El tiempo es una población ya que con el tiempo se estima cuantas personas se sientan en las mesas y cual efectivo el uso de su tiempo para su producción.

B). Find the mean and median of the times.

Media 40.84

Mediana 44

C). Find the range and the standard deviation of the times.

Standard Deviation 14.84834

Exercise 82

A) Estimate the mean cost.

Mean Cost 8.33

B) Estimate the standard deviation.

Standard Deviation 4.926121

C) Use the Empirical Rule to estimate the proportion of costs within two standard deviations of the mean. What are these limits?

Chapter 5

Exercise 34

P (A1) = .20, P (A2) = .40, and P(A2) = .40. P (B1|A2) = .25. P(B1|A2) = .05, and P(B1|A3) = .10. Use Bayes' theorem to determine P (A3 | B1).

Exercise 36

Dr. Stallter has been teaching basic statistics for many years. She knows that 80 percent of the students will complete the assigned problems. She has also determined that among those who do their assignments, 90 percent will pass the course. Among those students who do not do their homework, 60 percent will pass. Mike Fishbaugh took statistics last semester from Dr. Stallter and received a passing grade. What is the probability that he completed the assignments?

Exercise 38

One-fourth of the residents of the Burning Ridge Estates leave their garage doors open when they are away from home. The local chief of police estimates that 5 percent of the garages with open doors will have something stolen, but only 1 percent of those closed will have something stolen. If a garage is robbed, what is the probability the doors were left open?

Chapter 6

Exercise 45

A Tamiami shearing machine is producing 10 percent defective pieces, which is abnormally high. The quality control engineer has been checking the output by almost continuous sampling since the abnormal condition began...