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The owner of a dry cleaning business, in an effort to measure the quality of the services provided, would like to study the number of dry-cleaned items that are returned for rework per day. Records were kept for four weeks (Monday to Saturday) with the following results (read across from left to right):
4 6 3 7 6 8 6 4 8 6 5 12
5 8 3 4 10 9 6 5 8 6 7 9
(a) Define the random variable of interest and state the distribution you would expect this random variable to have.
(b) Set up the appropriate control chart(s) to monitor the random variable of interest.
(c) Suppose that the previous long run average for the number of items returned was 5 per day. Recalculate the control limits and evaluate the results in light of this information.
To revise an existing inventory system, a company needs to know something about the lead time for orders it places for a critical part. The company looks at the last 20 orders placed and finds that the lead time in days are:
True mean chloride level of all healthy Washington residents. What is the lower limit of the 90% confidence interval? what is the upper limit of the 90% confidence interval?
A marketing agency has developed three vacation packages to promote a timeshare plan at a new resort. They estimate that 20% of potential customers will choose the day plan
Assume that 80% of the adult population in the United States has tasted either Coke or Pepsi. For a sample of 250 adults, How many would you expect to have tasted either Coke or Pepsi? Whats the variance?
If we want to increase our confidence level from 95% to 99%, what happens to our confidence interval?
Find the probability of an untrained dog performing as well as Maggie. Is it unusual for an untrained dog to do as well as Maggie?
Standard deviation of 11.6 hours. what is the 99% confidence level for the mean number of hours that the population of high school students spent working each week?
A machine is set to fill a small bottlewith 9gram of a medicine. A sample of 8 bottles revealed the following amount (g) in each bottle. At the .01 sig level, can we conclude that the mean weight is less than 9 grams?
Suppose a doctor uses the average x bar for two tests taken about a week apart. what is the probability of x bar less than 3500? C. Repeat part B for n = 3 tests taken a week apart.
Estimate a range of values centered about the mean in which about 95% of the state per captia income taxes will fall.
Is there enough evidence to reject the claim that the average cost of a home in both locations is the same? Use α = 0.01. Clearly mark each of the five steps in hypothesis testing.
Compute mean x and standard deviation s of data above. Calculate Ho by using traditional/classical method.
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