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Question: Homeowners 2005. In 2005 the U.S. Census Bureau reported that 68.9% of American families owned their homes. Census data reveal that the ownership rate in one small city is much lower. The city council is debating a plan to offer tax breaks to first-time home buyers in order to encourage people to become homeowners. They decide to adopt the plan on a 2-year trial basis and use the data they collect to make a decision about continuing the tax breaks. Since this plan costs the city tax revenues, they will continue to use it only if there is strong evidence that the rate of home ownership is increasing.
a) In words, what will their hypotheses be?
b) What would a Type I error be?
c) What would a Type II error be?
d) For each type of error, tell who would be harmed.
e) What would the power of the test represent in this context?
Suppose that we have prior information concerning whether a random incoming message is spam. In particular, suppose that over a time period.
Reacting to risks. National newspapers such as USA Today and the New York Times carry many more stories about deaths from airplane crashes than about deaths.
a die is loaded so that the number 6 comes up three times as often as any other number. what is the probability of
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
Patrick was studying effects of small rewards (such as candy, gum, and soda pop) on intrinsic motivation. He tested fifth-grade children in a special room set aside by the school.
We are investigating wallabies. We know that the overall population of adult wallabies can jump, on average, 22 feet in one leap. We find a group of 14 wallabies that are particularly tall, living off by themselves in some corner of habitat.
Every month a clothing store conducts an inventory and calculates losses from theft. The store would like to reduce these losses and is considering two methods.
Suppose a group of three Harper College students will be selected from a class that has 12 men and 16 women. What is the probability the group has at least one woman? Interpret this probability in context.
using an a 0.04 a confidence interval for a population proportion is determined to be 0.65 to 0.75. if the level of
you conducted a t-test in your research. you did not find a statistically significant difference between your groups
What is the difference between common causes of variation and special causes of variation?
Translate the following arguments into symbolic notation.- If you enter the teaching profession, you will have no money for vacations; and if you do not enter the teaching profession, you will have no time for vacations.
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