2.
If x is a binomial random variable with n=10 and p=0.8, the
mean value of x is______
3.
According to the central limit theorem, for samples of size 64
drawn from a population with µ =800 and σ = 56, the standard
deviation of the sampling distribution of sample means would equal
______
4.
Life tests performed on a sample of 13 batteries of a new model
indicated: (1) an average life of75 months, and (2) a standard
deviation of 5 months. Other battery models, produced by similar
processes, have normally distributed life spans. The 98% confidence
interval for the population mean life of the new model is _________
5.
A large national company is considering negotiating cellular
phone rates for its employees Human Resource department would like
to estimate the proportion of its employee population who own an
Apple iPhone. A random sample of size 250 is taken and 40% of the
sample own and iPhone.. The 95% confidence interval to estimate the
population proportion is _______
6.
The number of bags arriving on the baggage claim conveyor
belt in a 3 minute time period would best be modeled with the
________
7.
The weight of a USB flash drive is 30 grams and is normally
distributed. Periodically, quanlity control inspectors at Dallas Flash
Drives randomly select a sample of 17 USB flash drive. If the mean
weight of the USB flash drives is too heavy or too light the machinery
is shut down for adjustment; otherwise, the production process
continues. The last sample showed a meanand standard deviation of
31.9 and 1.8 grams, respectively. Using a = 0.10, theappropriate
decision is_______
8.
Elwin Osbourne, CIO at GFS, Inc., is studying employee use of
GFS e-mail for non-business communications. He plans to use a 95%
confidence interval estimate of the proportion of e-mail messages that
are non-business; he will accept a 0.05 error. Previous studies
indicate that approximately 30% of employee e-mail is not business
related. Elwin should sample _______ e-mail messages