Questions from Statistical Techniques

Q: A normal population has a mean of 12.2 and a

A normal population has a mean of 12.2 and a standard deviation of 2.5. a. Compute the z value associated with 14.3. b. What proportion of the population is between 12.2 and 14.3? c. What proportion o...

Q: If you ask three strangers about their birthdays, what is the

If you ask three strangers about their birthdays, what is the probability (a) All were born on Wednesday? (b) All were born on different days of the week? (c) None was born on Saturday?

Q: Two thousand frequent business travelers are asked which midwestern city they prefer

Two thousand frequent business travelers are asked which midwestern city they prefer: Indianapolis, Saint Louis, Chicago, or Milwaukee. One hundred liked Indianapolis best, 450 liked Saint Louis, 1,30...

Q: The Columbus, Ohio Area Chamber of Commerce wants to estimate the

The Columbus, Ohio Area Chamber of Commerce wants to estimate the mean time workers who are employed in the downtown area spend getting to work. A sample of 15 workers reveals the following number of...

Q: P(A1) = .20, P(A2)

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

Q: Automobiles arrive at the Elkhart exit of the Indiana Toll Road at

Automobiles arrive at the Elkhart exit of the Indiana Toll Road at the rate of two per minute. The distribution of arrivals approximates a Poisson distribution. a. What is the probability that no auto...

Q: In the past, schools in Los Angeles County have closed an

In the past, schools in Los Angeles County have closed an average of 3 days each year for weather emergencies. What is the probability that schools in Los Angeles County will close for 4 days next yea...

Q: A recent study by the Greater Los Angeles Taxi Drivers Association showed

A recent study by the Greater Los Angeles Taxi Drivers Association showed that the mean fare charged for service from Hermosa Beach to Los Angeles International Airport is $21 and the standard deviati...

Q: Listed below is the amount of commissions earned last month for the

Listed below is the amount of commissions earned last month for the eight members of the sales staff at Best Electronics. Calculate the coefficient of skewness using both methods. Hint: Use of a sprea...

Q: One-fourth of the residents of the Burning Ridge Estates leave

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% of the garages with open doors will hav...