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1. The following are random data from a normal population.
3.3 3.3 4.7 2.6 6.4 4.7 1.7 4.5 5.0 3.0
Construct a 98% con?dence interval for the population mean μ.
2. 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.
28 20 21 39 32 23 18 31 14 2318 22 28 24 33 12 23 21 25 25
(a) Can we say that the data are approximately normally distributed?
(b) Find a 95% con?dence 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% con?dence interval for μ.
(d) Is the 95% CI wider or narrower than the 99% CI? Brie?y explain why.
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
Mean=63.6 Standard deviation=2.5 If 36 data points are arbitrarily chosen, determine the probability that mean is less than 64.
The East Coast researcher decides to construct a two-sided 99% confidence interval. Which researcher will have the more precise estimate?
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to study the birth weight of infants whose mothers smoke a physician records the weights of 100 newborns whose mothers
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