The terms median, fiftieth percentile, and second quartile all represent the
same value.
If the value of the coefficient of linear correlation is near zero for two
variables, then the variables are not related.
The histogram for a binomial distribution that has a success probability
close to one will be skewed to the right, and the histogram for a binomial
distribution that has a success probability close to zero will be skewed to
the left.
If the random variable z is the standard normal score, then the mean of
the distribution of z is 1.
For a binomial distribution with a fixed value of p , the binomial
distribution begins to look like a normal distribution as n increases in
size.
The term standard error of the mean has the same meaning as the
standard deviation of the sample mean.
If our decision in a hypothesis test is to reject the null hypothesis, then we
are certain that the null hypothesis is false.
The alternative hypothesis, sometimes referred to as the research
hypothesis, is supported by using the sample evidence to contradict the
null hypothesis.
In a particular hypothesis test, if α = 0.05 and p-value = 0.042, then the
correct decision would be to fail to reject the null hypothesis.
In order to apply the F test, the sample standard deviation from each
factor level sample must be the same.
Some nonparametric methods use a z test statistics. When this occurs the
sample data is from a normal population.
In the 1936 presidential election in USA, Alfred Landon was predicted
(incorrectly) to beat Franklin D. Roosevelt based on the results of a
telephone survey. Since not all people had telephones, the survey was
biased because it related only to the opinion of those who could be reached
by telephone. This historical incident represents which of the following?
An improperly defined parameter
An improperly defined sampling frame
A poorly defined population
A sample with no statistic defined for the sample
All of the above
Suppose A and B are two nonempty events of a sample space, then
P(B) always equals which of the following?
P(B|A)
None of these.
This is a probability distribution.
The histogram of this distribution is skewed to the right.
P(x < 3) = 0.80
This is a binomial probability distribution.
The random variable is discrete.
A sample size of 16 is selected from a normal population. For this
population, P(x < 32.1) = P(z < 0.33) . Then, P(x < 32.1) =
P(z < 0.02) .
P(z < 0.80) .
P(z < 1.32).
P(z < 5.28) .
None of these.
When the calculated value of F, F * , is greater than the table value for F ,
we will
None of the above are correct.
df(Factor) = 3
df(Error) = 8
df(Total) = 12
All of the above are correct
None of the above are correct
Which of the following is not a property of the student’s t distribution?
Mean equals zero.
Standard deviation is greater than one.
Symmetrical about zero.
Used in testing hypotheses about σ .
In comparing student’s t distribution to the standard normal
distribution, we see that student’s t distribution is less peaked and
thicker at the tails.
You are testing the hypothesis p = 0.7 and have decided to reject this
hypothesis if after 15 trials you observe 14 or more successes. If the null
hypothesis is true and you observe 13 successes, then which of the
following will you do?
Commit a type I error.
Commit a type II error.
None of the above are correct.
Which of the following is the probability of having the computed value of
the test statistic fall in the critical region when the null hypothesis is true?
α
1 −α
β
1 −β
1 − (α +β )
A production process produces an item. On the average, 20% of all items
produced are defective. Each item is inspected before being shipped. The
inspector misclassifies an item 10% of the time. Suppose only items that
pass inspection are shipped. Items not classified good are scrapped. What
percentage of the items shipped are good?
The probability of producing a high-quality color print is 0.10. How many
prints do we have to produce such that the probability of producing at least
one quality print is larger than 0.90?
Two scholars report a whole series of t-test results from comparing various
factors of perceptions between AACSB (American Assembly of Collegiate
Schools of Business) accredited schools and non-AACSB accredited schools.
The following table shows how respondents from AACSB-accredited and
non-AACSB-accredited schools rated the importance of the ten faculty
evaluation factors.
Please answer the following questions:
(1) Explain why the samples discussed in this article are independent
samples. (3%)
(2) Many of the reported p-values are 0.000. Explain what is implied by
these p-values. (3%)
(3) The p-value for “activity in professional societies” is 0.394. Explain
what is implied by this p-value. (3%)
Please answer the following questions:
(1) What is the sample size? (2%)
(2) Find the degree of freedom of model. (2%)
(3) Find the degree of freedom of error. (2%)
(4) Find the F-value. (4%)
(5) Please write down the regression model. (2%)
(6) Explain this regression model. (3%)
(7) Do the four dimensions have significant effects on customer satisfaction
at α = 0.01 level in this model? Explain. (3%)
(8) Which dimension(s) you will delete from this model (α = 0.01) ?
Explain. (3%)
(9) Find the value of r-square. (2%)
(10)Explain the meaning of the r-square in this model (3%)
可觀看題目詳解,並提供模擬測驗!(免費會員無法觀看研究所試題解答)