Lecturer from BSD wants to conduct a survey on effectiveness of online teaching by collecting data from the teaching staff of various colleges in Oman. There are 500 teachers in UTAS – Nizwa, 200 in Nizwa University, 300 in Sohar University. The sample required is 150. Which of the following are the correct samples as per the stratified sampling technique? a. UTAS – Nizwa: 30, Nizwa University:75, Sohar University: 50 b. UTAS – Nizwa: 30, Nizwa University:75, Sohar University: 45 c. UTAS – Nizwa: 45, Nizwa University:75, Sohar University: 30 d. UTAS – Nizwa: 75, Nizwa University:30, Sohar University: 45

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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.