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Traffic engineers are experimenting with two ideas. First is that erecting signs that say "Accident Reduction Project Area" along freeways will increase awareness and hence decrease accidents. Such signs may have the effect on traffic speed. Second idea is that metering flow of vehicles onto on-ramps will spread out entering traffic and lead to average increase in speed on freeway. Engineers perform the experiment to see how these two ideas influence average traffic speed.
First, twenty more-or-less equivalent freeway interchanges are selected spread well around the single metropolitan area and not too close to each other. Ten of these interchanges are selected at random to get "Accident Reduction Project Area" signs (in both directions); other ten receive no signs. Traffic lights are installed on all on-ramps to meter traffic. Traffic lights can be adjusted to need 3 or 6 seconds between entering vehicles. Average traffic speed 6:30-8:30 AM and 4:30-6:30 PM will be measured at each interchange on 3 consecutive Tuesdays, with our response being average of morning and evening speeds. At each interchange, three settings of traffic lights are allotted at random to three Tuesdays.
Examine the results using book's method and using more traditional split-plot method. Report conclusions. (Are they the same both ways?)
An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.
The average cost per night of a hotel room in New York City is $273 (SmartMoney, March 2009). Assume this estimate is based on a sample of 45 hotels and that the sample standard deviation is $65.
Roll a die and record the count of spots on the up face: P(1) = 0, P(2) = 1/6, P(3) = 1/3, P(4) = 1/3, P(5) = 1/6, P(6) = 0.
Which of these variables are discrete and which are continuous random variables?
Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for the mean time spent on paperwork by all managers.
Conduct the hypothesis test and provide the test statistic, critical value and/or P- value and state the conclusion.
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a person in Africa is selected at random
A personality psychologist conducts a study to examine the relationship between extraversion and the number of siblings in a household.
Wall Street securities firms paid out record year-end bonuses of $145,500 per employee for 2005 (Fortune, February 6, 2006). Suppose we would like to take a sample of employees at the Jones & Ryan securities firm to see whether the mean year-end b..
In checking the quality of the work, she notices that some slight blemishes occasionally are apparent. A sample of 20 pieces of work resulted in the following number of blemishes on each piece:
You have been asked to study the effects of an employee-wide training program, in a company of 500 employees, designed to reduce the amount of customer complaints.
An industrial chemical to retard the spread of fire in paint has been developed. From past experience, 48% of sales calls will result in an order.
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