Determine the probability that all are defective
A lot of 100 semiconductor chips contains 20 that are defective. Three are selected, at random, without replacement, from the lot. Determine the probability that all are defective.
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Compare the difference in the widths of the two confidence intervals for their means.
The US department of transportation maintains statistics for consumer complaints for 100,000 airline passengers. In the first nine months of 2009 consumer complaints were 0.99 per 100,000 passengers. What is the probability that in the next 100,00
You want to determine the average number of hours worked by professors at your university per week. You want to be able to express your answer as a confidence interval, with 95% confidence (that is, use z = 1.96) and you are aiming for a precision
An order for a computer can specify any one of three memory sizes, any one of two types of displays, and any one of four sizes of a hard disk, and can either include or not include a pen tablet. How many different systems can be ordered?
Assume that causes of heart failure between individuals are independent. What is the probability that 4 individuals have conditions caused by outside factors?
If a random sample of five computer power system is selected from the large number of sites in the country, what is the probability that at least three will have a high neutral to full-current load ratio?
A sample of 20 glass bottles of a particular type was selected, and the internal pressure strength of each bottle was determined. Consider the following partial sample information:
Suppose we wanted the total width of the two-sided confidence interval on mean life to be five hours at 95% confidence. What sample size should be used?
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