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Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study was then done to see if the mean time has increased in the new century. A random sample of 26 first-time convicted burglars in a recent year was picked. The mean length of time in jail from the survey was 3 years with a standard deviation of 1.8 years. Suppose that it is somehow known that the population standard deviation is 1.5. Conduct a hypothesis test to determine if the mean length of jail time has increased. The distribution of the population is normal.
State the null and alternative hypotheses.
a. Ho:
b. Ha:
Twenty percent of U.S. mortgages are "underwater" (The Boston Globe, March 5, 2009). A mortgage is considered underwater if the value of the home is less than what is owed on the mortgage. Suppose 100 mortgage holders are randomly selected.
Characterize the significance of the Black Death's impacts on the economic and cultural life of medieval Europe.
Define the parameter of interest in the context of this situation. Use appropriate notation.- Describe the sample statistic of interest in the context of this situation. Use appropriate notation.
A company may want to see how successful its different advertisement campaigns are. By using regression analysis, a company could make regression models
Compare the primary strengths and weaknesses of cost-benefit analysis (CBA), cost-effectiveness analysis (CEA), and cost-utility analysis (CUA).
Say that you know that the average amount of milk that American kids drink is 9 ounces per day with a standard deviation of 3. A researcher thinks that children raised on farms will drink more milk on average due to the availability of fresh milk..
How would you go about studying a nonlinear or curvilinear relationship between two variables using contingency tables and chi-square tests? Provide examples from you own professional experience.
Distinguish between a quota sample and a purposive sample.- What three criteria characterize good descriptions of data?
Avalon Bakery would like you to recommend how many loaves of its rye bread to bake at the beginning of each day. Each loaf costs the bakery $3.00 and can be sold for $6.00.
The results were analyzed using a block design ANOVA. The results of the analysis include: SSTR = 9,875, SSBL = 1,445, and SST = 22,364. Are all four training methods equally effective? Explain.
a field researcher is gathering data on the trunk diameters of mature pine and spruce trees in a certain
q1.a multiple-choice test consists of 12 questions with 4 possible answers to each question. in how many ways can the
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