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Is there a relationship between the race of violent offenders and their victims? Data from the U.S. Department of Justice (Expanded Homicide Data Table 5, 2007) are presented below:Characteristics of OffenderCharacteristics of Victim White Black OtherWhite 2,918 566 51Black 245 2,905 11Other 50 25 95a) Let's treat race of offenders as the independent variable and race of victims as the dependent variable. If we first ignore the independent variable and try to predict race of victim, how many errors will we make?b) If we now take into account the independent variable, how many errors of prediction will we make for those offenders who are white? Black offenders? Other offenders?c) Combine the answers in (a) and (b) to calculate the proportional reduction in error for this table based on the independent variable. How does this statistic improve our understanding of the relationship between the two variables?
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.
A sample standard deviation = 5.60 hours, find the upper limit of a 98% confidence interval estimate of the true population mean life.
The weekly salaries of teachers in one state are normally distributed with mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than $525 per week?
Consider Obama's health care plan. There are = #s of males and females. 50% of the females approve (A) of the plan and 70% of the males do not approve (N) of the plan.
The producer of a TV special expected about 40 percent of the viewing audience to watch a rerun of a 1965 Beatles Concert. A sample of 200 homes revealed 60 to be watching the concert.
Joe is being audited by the IRS and must provide an estimate for his investment earnings over the next four years. After a thorough search, Joe can only find the following records.
It has been determined that the mean life is 1000 hours and the standard deviation is 50 hours. It can be concluded that at least 89% of the bulbs will last between?
A fair die is rolled nine times. What is the probability that an odd number (1,3 or 5) will occur less than 3 times?
What measurements assesses the amount of variance of change in the dependent variable reflected by changes in the independent variable?
It is estimated that 3% of the athletes competing in a large tournament are users of an illegal drug to enhance performance. The test for this drug is 90% accurate.
Conduct a hypothesis test to test that the population mean for population A is no greater than the population mean for B. Use the 0.08 significance level.
Calculate expected number of interruptions per day. Calculate standard deviation.
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