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Propose a two sample z-test of a population mean and identify it as either an independent test or a dependent test.
Provide an example in simplest terms.
Assume a mean wage of $1,000 and standard deviation of $100. What's the probability of finding an employee with a wage of between $790 and $1000?
Using a 1% level of significance, can we say that there is a difference in the average waiting time between the two shops? Find the critical value(s).
What is the 95% confidence interval for the mean number of microwaves sold at a retail store in the chain last week?
Find out the upper and lower bounds on average life expectancy of the Canadian women such that at least 90% of all population is included.
Based on these data, determine the 95 percent confidence interval estimate for true population mean?
In the past HR uses an average of 25 vacation days per worker in order to make available man-hour and payroll predictions. Is there evidence to show that the number of vacation days decreased over the past year? Use alpha = .05
Test the significant difference between Chi-square for attributes
54% of men consider themselves professional baseball fans. You randomly select 10 men and ask if he considers himself a fan. Find the probability that the number who consider themselves professional fans is
An independent testing services road-tested 36 of the automobiles.
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by two different states.
Suppose that Total Revenue = 200Q and Total Cost = 80 + 50Q where Q, the quantity sold, is a random variable with expected value 20 and variance 4.
If HIV virus is actually present, the probability that ELIA test will give a positive result from ELISA is .01. If ELISA has given a positive result, use the Bayes' theorem to find the probability that the HIV virus is actually present.
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