The press release stated that the sample of 19477 cases from a treatment group got the two doses of the Biotech/Pfizer Covid-19 vaccine and 8 of them felt ill with covid-19.  94 people out of 19478 for the sample of the placebo felt ill with Covid-19.   Find the 95% confident interval whether the Pfizer Covid-19 vaccine is effective.   Round your answer to nearest ten-thousandth.

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Q: FIND t a n = 15 for the 98% confidence interval for the mean.

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Q: A survey of folk music fans yields this 95% confidence interval estimate of the proportion of fans…

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Q: determine with 95% confidence that his drug avoids diagnosis of insomnia as a side-effect?

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Q: Suppose you are told that a 95% confidence interval for the average price of a gallon of regular…

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