17. The average salary for all 27 Arizona Diamondbacks (Major League Baseball) players in the 2012 baseball
season was $2,653,029, with a standard deviation of $2,587,139. The population, all National League baseball
players in 2012, earned an average salary of $3,213,479, with a standard deviation of $1,451,308. Does the
average salary of the Diamondbacks players differ from that of all players in the National League? What
statistical analysis is used to answer this question?
a. single-sample t test
b. z test
c. standard deviation analysis
d. dependent-samples t test
18. What is the correct formula for calculating the standard deviation of a sample when you are NOT trying to
estimate the population standard deviation?
a.
$$ \sqrt{\frac{\sum(X-M)}{(N-1)}} $$
b.
$$ \sqrt{\frac{\sum(X-M)^2}{(N-1)}} $$
c.
$$ \sqrt{\frac{\sum(X-M)^2}{N}} $$
d.
$$ \sqrt{\frac{\sum(X-M)^2}{N-1}} $$
19. A researcher collects 25 data points that yield a mean of 8.164 and a standard deviation (based on N-1) of 2.467.
What is the standard error for the distribution of means?
a. 0.099.
b. 0.302
c. 0.493
d. 0.504