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During the month of July, an auto manufacturer gives its production employees a vacation period so it can tool up for the new model run.
In surveying a simple random sample of 200 production workers, the personnel director finds that 38% of them plan to vacation out of state for at least one week during this period. Is this a point estimate or an interval estimate? Explain.
What statistical test should be used to analyze these data? Identify H0 and Ha for this study. Conduct the appropriate analysis.
Multiple choice questions based on F-distribution.
Explore how the average number of hours a student studies per night and the students GPA affect their ACT score.
Let p1 = 100 and n1 = 500; and p2 = 200 with n2 = 500. Test whether there is a statistical difference between the two proportions at the 5% significance level.
The distribution of piston diameters is normally distributed. It is known that 10% of all pistons have diameters exceeding 20 inches and 5% have diameters smaller than 10 inches. What are the mean and SD of the distribution?
Assuming that the calls are Poisson-distributed, calculate the probability that the consultant receives at least 2 calls during any 30 minute period.
A technician starts a job at a time Y1 that is uniformly distributed between 8:00 A.M. and 8:15 A.M. The amount of time to complete the job, Y2, is an independent random variable that is uniformly distributed between 20 and 30 minutes. What is the..
An urn contains 50 beads. The beads are identical in shape and have one of two colors: blue and orange. We would like to estimate the proportion p of blue beads. Compute the sample proportion p^ of blue beads for each of the 100 samples found in (i..
What percentage of the high temperatures are within the interval x‾ - S to x‾ + S? How do these percentages compare to the corresponding percentages for a normal distribution (68.26% and 95.44%, respectively)?
a 95 confidence interval for the proportion of women that have ever dozed off while driving is 0.07 to 0.14. for men
Bid/Ask Spread Utah Bank's bid price for Canadian dollars is $.7938 and its ask price is $.8100. What is the bid/ask percentage spread?
In a certain garage, there are three mechanics per work shift of eight hours. The garage is open 24 hours a day. Customers arrive according to a Poisson process with rate λ = 2.5 per hour. The time a mechanic takes to perform an arbitrary task is ..
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