Mathematics, 28.11.2019 19:31, genesisdiaz2562
Te shelf life (duration until the expiration date in months) of certain ointment is known to have a normal distribution. a sample of size 120 tubes of ointment gives x = 36.1 and s = 3.7.
a. construct a 95% confdence interval of the population mean shelf life.
b. suppose a researcher believed before the experiment that 4 σ = . what would be the required sample size to estimate the population mean to be within 0.5 month with 99% confdence?
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