# Question: a strategy suggested in some countries to combat the covid19...

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A strategy suggested in some countries to combat the COVID–19 pandemic is called Herd Immunity. This involves achieving a high level of immunity across the general population in order to provide “indirect” protection to those who are not immune.

A researcher intending to determine the level of immunity of the Australian population at a point in time in the future found that from a sample of 1000 Australian residents, a reliable test indicated that 670 had immunity.

i. State the name and the value of the statistic that provides the best estimate for the proportion of the Australian population with immunity.

ii. Calculate a 95% confidence interval to estimate the true proportion of the Australian population with immunity to COVID-19.