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Problem 4 A study of 250 randomly selected smokers who tried to quit smoking with nicotine patch...

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Basic Math

Problem 4

  1. A study of 250 randomly selected smokers who tried to quitsmoking with nicotine patch therapy is conducted. After the study,it is found that 60% are still smoking a year later. Use a 5%significance to test the statement that among smokers who try toquit with nicotine patch therapy, less than 75% are still smoking ayear later. Please include your requirements, null and alternativehypotheses, test statistic (show equation), p-value, decision ruleand conclusion.
  2. Recalculate the p-value using normalcdf. Show your graph andcalculator commands.
  3. Build a 90% confidence interval using your calculator anddecide if you can conclude the same. Explain.

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