AP Statistics Unit Review

A random sample of traffic tickets given to motorists in a large city is examined. The tickets are classified according to the race of the driver. The results are summarized in the table. We wish to test H0: The racial distribution of traffic tickets in the city is the same as the racial distribution of the city’s population. Assuming H0 is true, the expected number of Hispanic drivers who would receive a ticket is

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All current-carrying wires produce electromagnetic (EM) radiation, including the electrical wiring running into, through, and out of our homes. High-frequency EM radiation is thought to be a cause of cancer. The lower frequencies associated with household current are generally assumed to be harmless. To investigate this, researchers visited the addresses of a random sample of children who had died of some form of cancer (leukemia, lymphoma, or some other type) and classified the wiring configuration outside the dwelling as either a high-current configuration (HCC) or a low-current configuration (LCC). Data is given in the table.Computer software was used to analyze the data.X2 = 0.082 + 0.170 + 0.023 + 0.048 + 0.099 + 0.013 = 0.435The appropriate degrees of freedom for the statistic is

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All current-carrying wires produce electromagnetic (EM) radiation, including the electrical wiring running into, through, and out of our homes. High-frequency EM radiation is thought to be a cause of cancer. The lower frequencies associated with household current are generally assumed to be harmless. To investigate this, researchers visited the addresses of a random sample of children who had died of some form of cancer (leukemia, lymphoma, or some other type) and classified the wiring configuration outside the dwelling as either a high-current configuration (HCC) or a low-current configuration (LCC). Data is given in the table. Computer software was used to analyze the data. X² = 0.082 + 0.170 + 0.023 + 0.048 + 0.099 + 0.013 = 0.435 Which of the following may we conclude, based on the test results?

• There is strong evidence of an association between wiring configuration and the chance that a child will develop some form of cancer.
  

• HCC either causes cancer directly or is a major contributing factor to the development of cancer in children.
  

• Leukemia is the most common type of cancer among children. 
  

• There is not convincing evidence of an association between wiring configuration and the type of cancer that caused the deaths of children in the study.
  

• There is a weak evidence that HCC causes cancer in children. 
  

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