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An automobile manufacturing company is attempting to cope with rising health care costs of its employees. It offers three types of plans. Based on a random sample of 200 employees selected last year, Table shows the number who selected each plan.
The same table also shows, for a random sample of 150 employees selected in the current year, the number who selected each plan. Can we conclude that employee preferences for the health care plans have changed from last year? Use α = 0.05. What is the p-value?
Year
Plan 1
Plan 2
Plan 3
Last year
50
40
110
Current year
15
45
90
A contractor developed a multiplicative time series model to predict the number of contracts in future quarters, using quarterly data on number of contracts during the 3-year period from 1996 to 1998.
It is important for airlines to know the approximate total weight of the baggage carried on each airplane. An airline researcher believes that the mean baggage for each adult is 60 kg. To test his belief, he draws a random sample of 50 adult passenge..
Assume that the number of new visitors to a website in one hour is distributed as a Poisson variable. The mean number of new visitors to the website is 4.0 per hour. What is the probability that in any given hour
A running coach wanted to see whether runners ran faster after eating spaghetti the night before. A group of six runners was randomly chosen for this study.
Carry out t test and find out whether or not demand and unit price are related. Let a=.05. Carry out an F test and find out whether or not demand and unit price are related.
Selecting a European Distribution Center Site for American International Automotive Industries
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
Mr.Smith works on a temporary basis. The mean length of each job he gets is three months. If the amount of time he spends between jobs is exponentially distributed with distributed with mean 2, then at what rate does Mr. Smith get new job?
If so, determine the overall mean and standard deviation for all the units measured, then compute and interpret the Process Capability Index if the specification limits are USL 5 33.700 pounds and LSL 5 21.700 pounds.
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
An insurance contract sold to (x) and (y) provides for a death benefit of 1 unit at moment of the first death. Find the initial annual rate of premium payment.
Extend the grammar given in Figure 6.20 to accommodate standard expressions involving addition, subtraction, multiplication, and division. Model the syntax and semantics for these operators according to Java or C.
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