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When people smoke, the nicotine they absorb is converted to cotinine, which can be measured through blood tests. A random sample of 40 smokers has a mean cotinine level of 172.5 ng/ml. Assuming that = 119.5 ng.ml, test the claim that the mean cotinine level of all smokers is equal to 200.0 ng/ml. Use a 0.05 significance level.
Toss ten unbiased coins once at the same time, what is the probability that seven heads showing up? Use Binomial Distribution to calculate the probability.
Where does the p-value come from for the spatial scan statistic used in SaTScan? Explain how Monte Carlo simulation is used to derive a p-value for a cluster.
Great Plains Roofing and Siding Company inc, sells roofing and siding products to home repair retailers, such as Lowe's and Home Depot, and commercial contractors.
Write the expression below as simply as possible in its radical form. Assume that all of the variables in the expression represent positive real numbers.
The cholesterol concentration in the yolks of each of a sample of 22 randomly selected eggs laid by free range chickens were found to have a mean value of 9.38 mg/g of yolk and a standard deviation of 1.62 mg/g.
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.
Conduct a hypothesis test. What is the p-value and how much evidence is there to conclude that the power plants cooling system is not working properly.
Two groups of students are asked to rank their preference for six types of soft drinks. The following table shows their rankings.
Does the overall data support the mayor's claim?
If you are performing a hypothesis test using a z statistic in which you sampled 50 people and found an average SAT verbal score of 542 (assume we know the population mean to be 500 and the standard deviation to be 100)
In addition, the average daily balances have been found to be normally distributed (Gaussian). What percentage of personal checking account customers carry average daily balances in excess of $800?
What is sampling error? Could value of sampling error be zero? If it were zero, what would this mean?
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