A random sample of 21 waiting times (in minutes) before patients saw a medical professional in a hospital's minor emergency department had a variance of 1.21 After a new admissions procedure was implemented, a random sample of 20 waiting times had a variance of 0.81 minute. At a = 0.05, can you support the hosp that the standard deviation of the waiting times has decreased? Complete parts (a) through (e) below. "0. 1-2 'a 1 D. Ho: of so3. Hai o? > o? (b) Determine the critical value and the rejection region. What is the critical F-value? Fo = 2.16 (Round to two decimal places as needed.) What is the rejection region for this F-test? O A. F< -F, or F>Fo B. F>Fo O C. F

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A: From the provided information, Mean (µ) = 3.11 mA Standard deviation (σ) = 1.03 mA X~N (3.11, 1.03)

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A: We have to find variance for given data.

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.