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Suppose the cost of an observation varies from stratum to stratum, where the cost of sampling a unit from stratum j is cj . Suppose there is a fixed start-up cost co to run the survey, so the total cost is co + c1n1 +· · ·+cJ nJ .
Now instead of fixing the total sample size n, we fix total survey cost C. Find the allocation of n1, ..., nJ that minimizes the variance of the estimator for the population mean. You may ignore the finite population correction factor.
1. a new company came out with a new battery that promised that it would last for more than 8 hours with the standard
If one person is selected at random from these young ones, find the probability that this person is employed given that the person is male.
There are 10 rolls of film in a box and 3 are defective. Two rolls will be selected, one after the other. What is the probability of selecting a defective roll folloed by another defective roll?
Based on comparing the computed statistics to the critical value which of the following is true - study is designed to investigate whether there is a difference in response to various treatments in patients with rheumatoid arthritis.
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 20 hours, with a standard deviation of 5.5 hours
car sales in the current month 18830 toyota camry cars were sold and there were 18341 honda civic cars soldprovide two
Based on your answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
The natural rate of capacity utilization is defined as the rate at which Y is zero. What is this rate for the period under the study?
Standard deviation of 424 and 155 respectively. at the .05 level of significance, test the claim that the new version has standard deviation equal to that of the past version.
What would the researchers have concluded about the study medication if they had ignored the effect of sepsis on survival in their analysis?
if you upload an image please make sure it is clear and your writing is legible.a telemarketer makes 80 calls in a one
How many cars must be randomly selected and tested in order to estimate the mean braking distance of registered cars in the US to give a 99% confidence that the sample mean is within 2 ft of the population means. The population standard deviat..
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