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A small gasoline station next to an interstate highway is open for 24 hours per day and has one pump and room for two cars, including the one that is using the pump. The mean arrival rate of cars is 8/hour and the mean service time at the pump is 6 minutes. The expected profit received from each car is $10. For an extra $120 per day, the owner of the station can increase the capacity for waiting cars by one. Is the additional capacity worth its cost?
For given population of high school seniors, the schoolastic aptitude test (SAT) in mathemathics has mean score of 500 with the standard deviation of 100.
Constructing histogram, Using a normal probability plot, Plotting residuals versus x values.
Determine the mean production of acorn in the last six years and calculate the standard deviation of data relative to acorn production.
ssume that these distributions are distributed as normal random variables with the means and standard deviations given previously. Find the probability that the return for common stocks will be greater than 8%.
The records show that 8% of the items produced by a machine do not meet the specifications. Use the normal approximation to the binomial distribution to answer the following questions.
Sample size of only 20. Find out a 95% confidence level for population Cp.
a recent study of 50 self service gasoline stations in the greater cincinnati northern kentucky metropolitan area
To give 98% confidence interval for population mean μ, you would use critical value.
q1. determine whether a statistical analysis should best involve examination of the population or of a sample in each
A pollster calls 500 randomly selected people and all 500 respond to her first question. Because the subjects agreed to respond, is the sample a voluntary response sample?
Tired of careless spelling and grammar, a company decides to administer a test to all job applicants. The test consists of 20 sentences. Applicants must state whether each sentence contains any grammar or spelling errors.
the maximum patent life for a new drug is 17 years. subtracting the length of time required by the fda for testing
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