1. A telemarketing company calculates that the probability of any dialed number being answered by a live person is 14%. If the company makes 15 calls, what is the probability that exactly two calls are unanswered? I think the answer is 0 or 0.017?I'm not sure which method to use to get the answer but they never explained to meso could you please show me the steps? How to know which formula to use?
2. For the telemarketing example in the previous question, the company tries using a new list, that they believe will result in an answer rate of 45%. If this is true, what is the expected number of calls that will be answered, if 20 calls are made?My instructor told me the answer was 9 but I don't know how they got this one either.
3. A new drug to alleviate migraine headaches is tested in a small pilot study. The researchers expect 70% of patients given the drug to report improved symptoms. Results of the pilot study (N=12) show that 11 out of 12 patients show improvements in symptoms. Test if this proves that the drug works even better than the researchers expect. Please show all steps. Thanks! Not sure but I think this is hypothesis testing question.