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Ask 10 people from a particular group (coworkers, students, civic group, etc.) what ages they are. Get at least 3 from each sex (i.e. male/female)
A cafeteria serving line has a coffee urn from which customers serve themselves. Arrivals at the urn follow a Poisson distribution at the rate of three .
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies
You are the process improvement manager and have developed a new machine to cut insoles for the company's top-of-the-line running shoes.
Researchers investigated the issue of race and equality of access to clinical trials. The table below shows the population distribution
What is the mean family size for the sample? I think the answer here is all the above #'s * 14=7.37143
Flash Jolt, a manufacturer of camera equipment, annually introduces new models in the fall of the year.
Finding critical values - Assume that the normal distribution applies and find the critical z values.
A researcher recorded the amount of time each bird spent in the plain chamber during a 60-minute session. Suspose the study produced a mean of M=37
USA Today reported on preferred types of office communication by different age groups. Suppose the results were based on a survey of 500 respondents
Does cocaine use by pregnant women cause their babies to have low birth weight?
A coffee manufacturer is interested in whether the mean daily consumption of regular-coffee drinkers is less than that of decaffeinated-coffee drinkers
A nationwide sample of influential Republicans and Democrats was asked as a part of a comprehensive survey whether they favored lowering environmental
It is an open secret that airlines overbook flights, but I have just learned recently that bookstores underbook
A Wall Street Journal article suggests that age bias is becoming an even bigger problem in the corporate world.
The manufacturer of an airport baggage scanning machine claims it can handle an average of 580 bags per hour
A coin mint has a specification that a particular coin has a mean weight of 2.5g. A sample of 39 coins was collected
A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 950 hours.
The manufacturer of an airport baggage scanning machine claims it can handle an average of 530 bags per hour.
Describe the "third variable problem" as it relates to correlation and provide an example of how you might see this played out in your own field.
Two teams of workers assemble automobile engines at a manufacturing plant. Quality control personnel inspect a random sample of the teams assemblies
From the following table giving the quantity demanded of a commodity (Y), its price (X1), and the consumers income (X2) from 1986 to 2005
Chose a published database containing government data; U.S. Bureau of Labor Statistics. The chosen file must have several variables in order
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead
In a two-population test, when will you use paired samples?