Exercise 6.11 presents the results of a poll evaluating support for a generic "National Health Plan" in the US in 2019, reporting that 55% of Independents are supportive. If we wanted to estimate this number to within 1% with 90% confidence, what would be an appropriate sample size?

The sample size is  

Step-by-step explanation:

From the question we are told that

    The  population proportion is  p =  0.55

    The  margin of error is  E  =  0.01

Given that the confidence level is  then the level of significance is mathematically represented as

=>  

Generally from the normal distribution table the critical value  of   is  

Gnerally the sample size is mathematically represented as

=>  

=>    

=>    

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2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°