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The viscosity of an industrial paint, as tested by the Ford Cup method, is specified to be 34 secs ± 1 sec. Fifteen batches of the paint have been tested, and the results are shown below:
33.75 33.05 34.00 33.81 33.46 34.02 33.58 33.27
33.49 33.20 34.62 33.00 33.54 34.12 33.84
(a) From the sample, does it seem that the population mean is on target?
(b) Find the 95% confidence interval for the population mean.
(c) Using some SIMPLE test or tests, check to see if the data is "reasonably" Normal.
(d) What percentage of batches is likely to be outside the specification in the long run?
A box contains 10 items, of which 3 are defective. 2 items are randomly selected, one at a time, with replacement, and x is the number of defective items in the sample. To look up the probability of a defective item being drawn from the box, using a ..
The mean sales per customer µ for all of the sales for your company last month is not known. Based on your past experience, you are willing to assume that the population standard deviation of sales, σ, is about $220. If you take a random sample of 10..
2. At a school pep rally, a group of sophomore students organized a free raffle for prizes. They claim that they put the names of all of the students in the school in the basket and that they randomly drew 36 names out of this basket. Of the pr..
1. The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 20%. If 14 calculators are selected at random, what is the probability that less than 3 of the calculators will be defective?
Suppose you estimate the mean length of all popular songs to be 182 seconds. Then, you use a random sample of 40 songs from your iPod to construct a confidence interval. The confidence interval you construct is (182.2, 226.2). What can you conclude a..
Identify a business research topic, define the research questions for the identified problem or opportunity and select the appropriate research methodologies and techniques to use for the research project
The manager of a furniture company has collected data on the amount of money spent on advertising and sales revenue for the last ten months. The data is as follows
Foreign trade is important to the United States. No country exports and imports more. However, there has been a large trade imbalance in many sectors. To measure the extent of the prob- lem, an economist recorded the difference between exports and im..
Identify a cost reduction or performance improvement opportunity in a real business (large or small) or in any organization to apply one of the techniques discussed in the course. Collect real data and be ready to defend your assumptions ab..
A statistical process analyst is responsible for assuring statistical control. In one process, a machine is supposed to drop 11.4 ounces of mints into a bag. (Assume that this process can be approximated by a normal distribution). The acceptable rang..
A furniture company manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 15,000 board feet of oak and 21,000 board feet of pine are available. A table requires either 17 board feet ..
It is 1581 Anno Domini. At the Undergraduate School of UMUC, besides Assistant Academic Director of Mathematics and Statistics, I am also the Undergraduate School-appointed CPA, Coffee Pot Attendant.
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