________ Suppose a large labor union wishes to estimate the mean number
of hours per month a union member is absent from work. The union
decides to sample 339 of its members at random and monitor the working
time of each of them for 1 month. At the end of the month, the total
number of hours absent from work is recorded for each employee. Which of
the following should be used to estimate the parameter of interest for this
problem?
A large sample confidence interval for μ .
A large confidence interval for p .
A small confidence interval for p .
A small confidence interval for μ
I want to test H0 : p = 0.5 vs. Ha : p≠ 0.5 using a test of hypothesis. If I
concluded that p is 0.5 when, in fact, the true value of p is not 0.5 then
I have made a ________
correct decision
Type I and Type II error
Type I error
Type II error
________ Parking at a university has become a problem. University
administrators are interested in determining the average time it takes a
student to find a parking sport. An administrator inconspicuously followed
220 students and recorded the how long it took each of them to find a
parking sport. Identify the variable of interest to the university
administration.
number of students who cannot find a spot.
number of empty parking sports.
students who drive cars on campus.
time to find a parking sport.
The ________ generally describes fluctuations of the time series that are
attributable to business and economic conditions.
season variation.
cyclical fluctuation.
residual effect.
secular trend.
The Central Limit Theorem is considered powerful in statistics because
________
it works for any sample size provided the population is normal.
it works for any population distribution provided the sample size is
sufficiently large.
it works for any sample provided the population distribution is known.
it works for any population distribution provided the population mean
is known.
A certain baseball player hits a home run in 7% of his at-bats. Consider his
at-bats as independent events. Find the probability that this baseball
player hits more than 42 home runs in 800 at-bats? (10%)
The number of traffic accidents that occur on a particular stretch of road
during a month follows a Poisson distribution with a mean of 7.1. Find
probability that fewer than three accidents will occur next month on this
stretch of road. (10%)
A machine is set to pump sprayer into a process at the rate of 6 gallons per
minute. Upon inspection, it is learned that the machine actually pumps
cleanser at a rate described by the uniform distribution over the interval 6
to 8 gallons per minute. Would you expect the machine to pump more than
7.9 gallons per minute? (10%)
The professor would like to use the data to find the first-order model that
he might use to predicate a student’s grade on the first test using those
students’ grades on the first three quizzes.
Identify the dependent and independent variables for the model. (5%)
The professor would like to use the data to find the first-order model that
he might use to predicate a student’s grade on the first test using those
students’ grades on the first three quizzes.
What is the least squares predication equation? (5%)
The professor would like to use the data to find the first-order model that
he might use to predicate a student’s grade on the first test using those
students’ grades on the first three quizzes.
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