Question: Please help with A and B for question 2 b) Calculate the probability that the sample mean age is older than 71 years old. (2)

Please help with A and B for question 2

b) Calculate the probability that the sample mean age is older than 71 years old. (2) According to a small survey, 134 college students out of 200 have a smartphone. a) Calculate a 99% confidence interval for the population proportion of students who have a smartphone. b) Calculate the minimum sample size to make the 95% error margin be less than 1%. on) The table summarizes the result of a clinical test for the Down syndrome (DS) in

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