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Suppose that 5,000 sales invoices are separated into four strata.Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices. A sample of 500 sales invoices is needed.
a.What type of sampling should you do? Why?b.Explain how you would carry out the sampling according to the method in (a)c.Why is the sampling in (a) not simple random sampling?
The sample mean, the sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters. True or false (please provide a solution or explanation).
Name the inferential statistical test that would be used for the method of training and why?
Given this Analysis of Variance information for three treatments each with six observations.with SST =1116, SSE=1068, SSTotal =2184. What is the mean square for treatments?
A study on body types gave the following results: 45% were short; 25% were short and overweight; and 24% were tall and not overweight.
For value 10,40,20,50 and 40, value of arithmetic mean is? Simplest measure of dispersion is the Standard deviation, variance, Quartile deviation.
Calculate the test statistic. Determine the p-value of the test-statistic.
Evaluate the mean wait time and throughput rate
Select a random variable to represent the category. Produce a probability mass function for that variable, and use it to compute the mean, the median and the variance of the data in the data set. Show the probability mass function, both in tabular..
A researcher wanted to invetigate whether there is a significant difference in the average age of instructors, assistant professors, assocated professors and full professors at a university. The faculty was selected at random and their ages were r..
In our discussions of basic probability theory the concepts of mutually exclusive events and independent events share prominent roles.
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?
What is the probability that sara will die in her 60th year? using this probability and the $50,000 death benefits, what is the expected loss?
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