If you wanted to test this null hypothesis at the 95% confidence level, what would be your critical z? (b) What is the standard error of the difference between proportions

MATLAB: An Introduction with Applications
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Suppose it was found that in a random sample of 200 individuals who were underweight (defined as having a BMI of under 18.5), 8 of them were hospitalized with COVID-19.  Of a corresponding group of 400 individuals who were classified as severely obese (defined as having a BMI of at least 45.0), 32 were hospitalized with COVID-19.

(a)  If you wanted to test this null hypothesis at the 95% confidence level, what would be your critical z?

(b) What is the standard error of the difference between proportions (to 4 decimal places)?

 

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