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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?)
Which of the following models satisfies the rules of probability and The event corresponding to the above system functioning properly during one period of operation is
If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
Describe what assumptions must be met to use this test. Finally, where in your course project data set might you employ a paired t-Test?
Toby's trucking company determined that the distance traveled per truck per year is normally distrinuted, with a mean of 50.0 thousand miles and a standard deviation of 12.0 thousand miles.
Do any of the selected samples seem to be out of the control limits? Describe.
Use the traditional method to test the given hypothesis. Assume that the population is normally distributed and that the sample has been randomly selected.
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were:
Determine point estimate of population mean? By using 90% confidence, determine the margin of error?
A dataset has 1000 records and 50 variables with 5% of the values missing, spread randomly throughout the records and variables. An analysis decides to remove records that have missing values. About how many records would you expect would be remov..
A random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a) What is the probability that the sample mean will have a value between 45 and 55?
Find the probability that a randomly selected teacher earns and what sample size is necessary to double the standard error of the mean and what sample size is needed to cut the standard error of the mean in half?
Which of the following statements is true regarding a nonparametric test? We assume that the data has been chosen from a normally distributed population
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