A survey of property owners’ opinions about a street-widening project was taken to
determine if owners’ opinions were related to the distance between their home and the
street. A randomly selected sample of 100 property owners was contacted and the
results are shown next.
This classification is summarized with what kind of table?
A binomial probability distribution approaches a greater degree of symmetry as the
probability of success remains constant and the number of trials becomes ___________.
The estimate of the population proportion is to be within plus or minus .10, with a 95%
level of confidence. The best estimate of the population proportion is .25. How large a
sample is required?
A university has 1,000 computers available for students to use. Each computer has a
250-gigabyte hard drive. The university wants to estimate the space occupied on the
hard drives. A random sample of 100 computers showed a mean of 115 gigabytes used
with a standard deviation of 20 gigabytes. What is the probability that a sample mean is
greater than 120 gigabytes?
A finite population correction factor is used to adjust the _________________.
Twenty-one executives in a large corporation were randomly selected to study the effect
of several factors on annual salary (expressed in $000s). The factors selected were age,
seniority, years of college, number of company divisions they had been exposed to, and
the level of their responsibility. The results of the regression analysis follow:
Test the hypothesis that the regression coefficient for age is equal to 0 at the 0.05
significance level. Report the degrees of freedom, the critical value, the test-statistic,
and your decision.
A major credit card company has determined that customers charge between $100 and
$1,100 per month. If the average monthly amount charged is uniformly distributed, the
percent of monthly changes between $311 and $889 is _______.
A manufacturer claims that less than 1% of all its products do not meet the minimum
government standards. A survey of 500 products revealed that 10 did not meet the
standard. Thus, the alternate hypothesis is ___________________.