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Washington Metro Bus Inc. operates a fleet of 400 buses. The fleet includes buses used for public transit as well as school buses. Buses used in public transit average close to 400 miles per day, seven days a week. School buses also amass considerable mileage, though not nearly as much as public transit bus. Metro Bus is interested in setting up inventory policy for bus tires that minimizes the sum of annual ordering and carrying cost. All buses use the same type of tires and the annual requirement of tires are 5000. Ordering cost per order is $125, and the cost for carrying a tire annually in inventory is $20. For practically purposes, the lead time is zero, as the supplier agrees they will deliver on the day the order is placed. Note that the basic unit of measurement for a period is one year in this case.
Problem:
1. What is the Economic Order Quantity (EOQ)?2. Compute the optimal number of orders each year?3. What is the length of the inventory cycle?
Predict with 95% confidence the test score at a school where 50% of the mathematics teachers have mathematics degrees, the mean age is 43, and the mean annual income is $48,30.
Why is population shape of concern when estimating a mean? What does sample size have to do with it?
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
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While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha :
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
A confidence interval increases in width as:
What is a 90% confidence interval for the mean monthly expenditure on gasoline per household in Slippery Rock?
Acme plumbing supply just received a shipment of 5,000 stainless steel valves, but 50 regular steel valves were also sent. There is no way to tell the difference between the valves.
Determine standardized test statistic z and its corresponding area. If convenient use technology. z=( ) round to two decimals. Area= ( ).
If a researcher decides to use multiple comparisons in a study with three conditions, what is the probability of a Type I error across these comparisons? Use the Bonferroni adjustment to determine the suggested alpha level.
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