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Sal's International Barbershop is a popular haircutting and styling salon near the campus of the University of New Orleans. Four barbers work full-time and spend an average of 15 minutes on each customer. Customers arrive all day long at an average rate of 12 per hour. When they enter, they take a number to wait for the first available barber. Arrivals tend to follow the Poisson distribution, and service times are exponentially distributed.
(a) What is the probability that the shop is empty?(b) What is the average number of customers in the barbershop?(c) What is the average time spent in the shop?(d) What is the average time that a customer spends waiting to be called to the barber chair?(e) What is the average number waiting to be served?(f) What is the shop's utilization factor?(g) Sal's is thinking of adding a fifth barber. How will this affect the utilization rate?
Sample of 81 houses was studied and found to have the mean of 1858 KWH. Determine the 95% confidence interval for true mean.
State the hypotheses for a right-tailed test. Obtain a test statistic and p-value assuming equal variances. Interpret these results. Is the difference in mean scores large enough to be important?
I am not understanding how to do this question as I am still trying to grasp an understanding of the material. I came across this question at the end of the chapter:
Metal detectors at airports are used to determine whether passengers are carrying weapons. If the null hypothesis states that a passenger isn't carrying a weapon, a type I error would occur whenever
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The main goal of correlation research is ______________
Illustrate by computation that, for straight -line regression of Y on x, β1= 0.
Professor wishes to determine whether prior statistical knowledge assists students in their performance on the final exam. What is the relationship between pretest scores and final exam scores after controlling for cumulative GPA. What SPSS test w..
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Sixty percent of the families in a certain community own their own car, thirty percent own their own homes, and twenty percent own both their own home and own car. If a family in the community is randomly chosen, what is the probability that they ..
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