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A paper manufacturer has a production process that operates continuously throughout an entire production shift. The paper is expected to have a mean length of 11 inches, and the standard deviation of the length is 0.02 inches. At periodic intervals, a sample is selected to determine whether the mean paper length is still equal to 11 inches or whether something has gone wrong in the production process to change the length of the paper produced. You select a random sample of 100 sheets, and the mean paper length is 10.998 inches. Construct a 95% confidence interval estimate for the population mean paper length.
The Absent Minded Professor study was a RCT, which had an objective to estimate the protective effect of drug "No-Reminder" compared to drug "Reminder" on risk of "Forgetful syndrome". The study found that the drug "No-Reminder" was protective.
What type of error has possibly been committed? Explain the error in ordinary language.
Find the average age at which people will experience their first cardiac incident, given that 17% of all initial cardiac incident victims are younger than 50. Please, interpret the result.
A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
EBook is a digital book provider that sells their downloaded product through both Anason and Bairnes-Nolb. Anason requires that EBook use a different format than they use for Bairnes-Nolb.
In a sample of 10 workers, what is the probability that exactly three workers take the public transport daily? [Hint: It is a Binomial Distribution Problem.]
A candy bar manufacturer is interested in trying to estimate how sales are influenced by the price of their product. To do this, the company randomly chooses 6 small cities and offers the candy bar at different prices.
Give all steps of a test of the hypothesis that the corresponding population proportions are equal.
A store manager wishes to find out whether there is a relationship between the age of her employees and the number of sick days they take each year. The data for the sample are shown below:
What is the value of the population mean? What is the best estimate of this value?
Suppose that weights of bags of potato chips coming from a factory follow a normal distribution with mean 12.8 ounces and standard deviation .6 ounces.
In a regression analysis involving 27 observations, the following estimated regression equation was developed.
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