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A quality control engineer believes that the proportion of defective items in a production process is a random variable with a probability distribution that is approximated as follows:
x
0.1
P (x)
0.2
0.3
0.4
0.5
0.6
The engineer collects a random sample of items and ?nds that 5 out of the 16 items in the sample are defective. Find the engineer's posterior probability distribution of the proportion of defective items.
Will the distribution of x bar always be approximately normally distributed, or does it depend on the distribution of the population?
Consider a charity organizations that receives random donations. Assume the donations to arrive following a Poisson process with a rate of one donation per hour in average. What is the probability that it will not be able to make the payment?
A sample of 64 account balances from a credit card company showed an average balance of $1,040. A previously determined population standard deviation is $200.
a clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo. before
assume z has a standard normal distribution. use appendix table ii to determine the value for z that solves each of the
a bank manager wanted to double-check her claim that recent process improvements have reduced customer wait times to an
In a sample of 12 bank tellers at a local branch office, the 7 tellers who have completed the advanced training program offered by the bank have a lower average error rate in the processing of transactions than the remaining 5 tellers.
When a sample mean is greater than the true, population mean, the resulting difference is called:
Create a research question for which the appropriate test of the statistical hypothesis would require the use of a z-score.
Suppose that the census indicates the average American earns $36,345.45 per year. You are interested in the whether people who majored in political science earn an amount that is different than the average American.
part -1make sure you read the output carefully. this output pertains to a set of juvenile court data looking at the
At the .05 significance level, is the number of units produced on the afternoon shift larger?
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