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In: Statistics and Probability

Please DO NOT HANDWRITE Immediately after a ban on using hand-held cell phones while driving was...

Please DO NOT HANDWRITE

  1. Immediately after a ban on using hand-held cell phones while driving was implemented, compliance with the law was measured. A random sample of 1,250 drivers found that 98.9% were in compliance. A year after the implementation, compliance was again measured to see if compliance was the same (or not) as previously measured. A different random sample of 1,100 drivers found 96.9% compliance.
  1. State the P-value of your test and also state your conclusion.  
  2. Develop a 95% confidence interval for the true difference in proportions between the first survey and the second survey and EXPLAIN what this confidence interval means in context of this problem.  EX: We are 95% confident that the true mean weight of the Doritos bags is between 28.60 and 29.36 grams.

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Expert Solution

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Interpretation: It shows that we are 95% confident that the true difference in proportions between the first survey and the second survey is between 0.008 and 0.032.

orchestra answered 3 years ago
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