how many kleenex should the kimberly clark corporation package of tissues contain? researchers determined that 60 tissues is the average number of tissues used during a cold. suppose a random sample of 100 kleenex users yielded the following data on the number of tissues used during a cold: = 52, s = 22. give the null and alternative hypotheses to determine if the number of tissues used during a cold is less than 60.
义素分析的基本步骤主要包括——、——、——。
if we are testing for the difference between the means of 2 related populations with samples of n1 = 20 and n2 = 20, the number of degrees of freedom is equal to
义素分析的原则可以概括为——、——、——。
青霉素抑菌机制是
for air travelers, one of the biggest complaints is of the waiting time between when the airplane taxis away from the terminal until the flight takes off. this waiting time is known to have a skewed-right distribution with a mean of 10 minutes and a standard deviation of 8 minutes. suppose 100 flights have been randomly sampled. describe the sampling distribution of the mean waiting time between when the airplane taxis away from the terminal until the flight takes off for these 100 flights.
these friends of multi–millionaire founder tim o’reilly are __________ unconventionally rich and richly unconventional __________ harbor a messianic faith in the economic benefits of the cult of the and cultural benefits of technology.