Show that the sample mean is an efficient estimator of the
population mean for a population...
Show that the sample mean is an efficient estimator of the
population mean for a population that is: normal distribution (mu,
1), Bernoulli(p), Exponential(theta), and Geometric(p).
1. In general, the sample mean is a better estimator of the
population mean for larger sample sizes.
True
False
2.
If events A and B are not mutually
exclusive, then it is possible that P( A)
+ P( B) > 1.
True
False
3.
What method of data collection would you use to collect data for
a study where a drug was given to 95 patients and a placebo to
another group of 95 patients to determine if the drug has an effect...
1. The point estimator for the population standard deviation σ is ___ and the point estimator for the population mean μ is ____.
2. To estimate the value of a population parameter using a sample, we would calculate...
a) a simple random sample, b) a sample statistic, c) a test statistic, d) or both a and b
3. A simple random sample from a finite data set must meet which condition(s)/requirements?
a) you may only sample without replacement; sampling with...
The sample proportion is the best estimator for the proportion
of a population because the average of all possible sample
proportions of the same size from the population will equal
_________.
1. Which of these are random variables:
Population mean, sample mean, population variance, sample
variance, population standard deviation, sample standard deviation,
population range, sample range
2. Does variance matter? I have two routes to my work. Travel
time on the first route takes me on average 20 minutes, and the
second route 19 minutes. The standard deviation of travel time on
the first route is 1.5 minutes, on the second is 5 minutes. Which
route should I take?
Match the terms with the following descriptions:
population sample population size sample size population
mean sample mean variance standard deviation alpha null hypothesis
alternative hypothesis degrees of freedom hypothesized mean p-value
t-statistic
The set of data for ALL individuals or items of interest., e.g.
everyone in the world, the entire of Texas, all of our customers,
etc. __________
Data you take randomly from the population because it’s too costly
or not feasible to measure the entire population. A subset of...
Compute the confidence interval for the difference of two
population means. Show your work.
Sample Mean 1= 17
Population standard deviation 1= 15
n1= 144
Sample Mean 2= 26
Population Standard Deviation 2= 13
n2 = 121
Confidence Level= 99