ii. A lecturer wants to take a sample of 40 students from a class of 160 to complete a survey on the module. In the past they have tried three ways: asking the first 40 students who turn up to lectures, emailing a survey to the entire class and hope 40 respond or ask each student in lecture to toss a coin twice and select the students who get two heads. Which approach would you prefer and why, or does it matter?
Please solve for part ii only.
i. A large clinic knows from experience that around 10% of patients fail to show up for routine blood test appointments. Suppose that 200 appointments are made each week (hint, n=?, p=?). What is the probability that up to 25 patients do not turn up each week?
ii. A lecturer wants to take a sample of 40 students from a class of 160 to complete a survey on the module. In the past they have tried three ways: asking the first 40 students who turn up to lectures, emailing a survey to the entire class and hope 40 respond or ask each student in lecture to toss a coin twice and select the students who get two heads. Which approach would you prefer and why, or does it matter?
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