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Suppose 40 manufacturing workers are selected randomly from across Germany and asked what their hourly wage is.
According to a front-page article in The Wall Street Journal, 30% of all students in American universities miss classes due to drinking.
A computer laboratory in a school has 33 computers. Each of the 33 computers has a 90% reliability.
Assume that the life in hours of a radio tube is normally distributed with mean 100 hours.
Whenever you apply for credit someone will check your credit score. Here is some data obtained from one of the agencies that administers the credit score.
If the executives with to calculate a number that would characterize the "center" of the age data, what statistical technique would you suggest? Explain.
Describe a hypothesis upon which the manufacturer might wish to conduct a test concerning the relative effectiveness of the new fertilizer.
A five-gear assembly is put together with spacers between the gears. The mean thickness of the gears is 5.030 cm with a standard deviation of 0.008cm
The time it takes for a taxi to drive fro, the office to the airport was recorded on 40 occasions. It was found that x_bar = 47 minutes and s = 5 minutes.
Assume that the readings on the thermometers are normally distributed with a mean of 0o and standard deviation of 1.00o C.
Give a 95% confidence interval for the mean blood pressure in the population from which the subjects were recruited.
Explain why the proper procedure to compare the mean response to placebo with control (no treatment) is a matched pairs t test.
Comparing two drugs. Makers of generic drugs must show that the do not differ significantly from the “reference” drugs that they imitate.
Problem requires the use "Crystal Ball", the popular commercial spreadsheet add-in. For clarity, it is distributed by Decisioneering, Inc
Select a second sampling technique for the same hypothesis and give a second detailed design of how you would gather sampling data.
Let X1 and X2 be independent normal random variables, X1 n(µi,si2), and let
The manager of the Gander Mountain store in Frogtown, IL, believes that his prices for ammunition are lower than the prices of his primary competitor.
Did the authors use the correct statistical test? In other words, what was their rationale for using this test (i.e., were the variables discrete.
A student wants to study the effect of two different nursing care models on quality scores of a several units in a hospital.
The resistances of carbon resistors of 1500 ohm nominal value are normally distributed with µ = 1500 and standard deviation = 200.
The Trail Making Test (TMT) is frequently used in neuropsychological assessment to provide a quick estimate of brain damage in humans
How many books must be sold to break even, and what is the break-even point, in dollars?
A student studied the effect of diabetic disease management on patients' A1C blood test results
In Lee County Georgia the distribution of weekly wages for workers in the construction industry is skewed to the right with mean equal to $473
In a contingency table, when all the expected frequencies equal the observed frequencies the calculated 2 statistic equals 1.