According to a poll taken last year, 45% of the cities' residents get most of their news from the Internet. To conduct a follow-up study that would provide 90% confidence that the point estimate is correct to within 0.04 of the population proportion, how large a sample size is required

The sample size is  

Step-by-step explanation:

From the question we are told that

    The population proportion is  

     The  margin of error is  

Given that the confidence level is  90%

  Then the level of significance can be mathematically represented as

Next we obtain the level of significance from the normal distribution table the value is    

   Generally the sample size is mathematically represented as  

substituting values

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