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The time from first exposure to COVID infection to diagnosis is called the incubation period.
The incubation periods of a random sample of 20 COVID infected individuals is given below (in
years):
12.0 10.5 5.2 9.5 6.3 13.1 13.5 12.5 10.7 7.2 14.9 6.5 8.1 17.9 13.2 11.7 12.9 9.9 12.1 9.8
A) Calculate the 95% confidence interval for the population mean. Did you use z- or t- for the CI
coefficient? Explain why.
B) What 2 assumptions are required for the confidence interval to be valid and how do you check
each assumption? Make any charts/plots as you deem necessary.
C) How to interpret the interval from (a)?

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