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People are arbitarily selected one by one, and their eye-color recorded as blue" or not blue". Assume that 20 percent of people have blue eyes. Let Xb be number of people selected until first person with blue eyes shows up, let Xn be number of people selected until first person with non-blue eyes shows up, and let X be number of people select until first person with different eye color to preceding people shows up. Find out E(Xb), E(Xn) and E(X).
Suppose that 30% of the population has black hair. In a randomly-selected group of six people, how probable is it that
I'm trying to determine what happens to the sample size if the level of confidence is reduced from 95% to 90% but the allowable error and the standard deviation remain
Exam is given to 20 randomly chosen students and their average length of t time needed to finish exam was 54 minutes with standard deviation of 5.99 minutes. Test instructor's claim at the 0.05 level of significance.
Show the sampling distribution of p if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
An oil co. is drilling some wells. the results are described as either a dry well or a producer well. Past experience suggests that 10% of exploratory wells are producer wells.
We are asked to investigate the hypothesis that the number of crimes is related to police expenditures because states with higher crime rates are likely to increase their police force, thereby spending more on the number of officers on the street.
Discuss the assumptions of this model. Specifically, how does each variable affect demand? How do the variables influence each other? What limitations might this model have? How can it be improved?
A normal distribution has a mean of 80 and a standard deviation of 14. Determine the value above which 80 percent of the values will occur.
The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly.
This is called a one-time fling. About 10% of all adults deliberately do a opne-time fling and feel no guilt about it!
Subjects at both sites were classified as dropouts if they left the study before the conclusion, or completers if they finished the study
What is the chi-square goodness of a fit test? What is its purpose? What does it measure? Is there a way of telling when the test is over?
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