The following data represent the rates (micrometers per hour) at which a razor cut made in the skin of anesthetized newts is closed by new cells.

(a) Can we say that the data are approximately normally distributed?
(b) Find a 95% confidence interval for population mean rate µ for the new cells to close a razor cut made in the skin of anesthetized newts.
(c) Find a 99% confidence interval for µ.
(d) Is the 95% CI wider or narrower than the 99% CI? Briefly explain why.

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