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A company that conducts surveys of current jobs for executives wants to estimate the average salary of an executive at a given level to within $2,000 with 95% confidence.
From previous surveys it is known that the variance of executive salaries is about 40,000,000. What is the minimum required sample size?
A fast food arrives at a fast drive through rest restaurant 6 minutes after it opens and then the arrival times for the next four customers in order are 3minutes, 8 minutes, 2 minute, and 5minutes.
Determine if the sample result indicates that the population variance is decreased from historical value of 0.35. At alpha = 1%, give values for test and critical statistics.
a water treatment plant needs to maintain the ph of the water in the reservoir at a certain level. to monitor this they
What is the mean number of streaked-shelled snails and what is the standard deviation of the number of streaked-shelled snails?
Suppose the security loading is 20%. How many contracts should be sold? It is estimated that 100 contracts will be sold. What should the security loading be?
Calculate Statistical Significant Difference of Voting
a car rental agency at a local airport has available 5 fords 7 chevrolets 4 dodges 3 hondas and 4 toyotas. if the
Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
question 1 the data displayed below represents the electricity cost during a recent month for a random sample of 50
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
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
You listen to radio station for 1 hour, at arbitrarily selected time, and carefully observe that amount of advertising time is equal to 7 minutes. Compute z-score for this amount of advertising time.
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