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A study was conducted looking at risk factors for HIV infection among intravenous drug users enrolled in a methadone program.
An investigator wishes to study the effect of cigarette smoking on the development of myocardial infarction (MI) in women.
Two drugs (A,B) are compared for the medical treatment of duodenal ulcer. For this purpose, patients are carefully matched on age, sex, and clinical condition
Independent random samples taken on two university campuses revealed the following information concerning the average amount of money spent on textbooks
The Management of Discount furniture designed an incentive plan for its Salespeople.To evaluate this innovative plan, 12 sales persons were selected
An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant
A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours.
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.