Whenever p = 0.5 , the binomial distribution will
always be symmetric.
be symmetric only if n is large.
be right-skewed.
be left-skewed.
For a given sample size n , if the level of significance (α ) is decreased, the power of
the test
cannot be determined.
will increase.
will decrease.
will remain the same.
Using an computer to mimic what would actually happen if you selected a sample and
used statistics in real life is called
database
mini-tab
simulation
random sampling
If A and B are independent events, with P(A) = (1/5) , P(B) = (2/5) , then
P(A or B)
equals (3/10)
equals (13/25)
equals (3/5)
equals (3/25)
For the variables time spent on homework and exam grade, which is more naturally the
response variable and which is the explanatory variable?
Time spend on homework: explanatory variable Exam grade: response variable
Time spent on homework: response variable Exam grade: explanatory variable
The classification of student major (economics, management, marketing, other) is an
example of
a discrete random variable.
a categorical random variable.
a parameter.
a continuous random variable.
If we use the χ to power of ((2)) method of analysis to test for the differences among
4 proportions, the degrees of freedom are equal to:
3
4
1
5
Interaction in an experimental design can be tested in
all ANOVA models.
a completely randomized model.
a two-factor model.
a randomized block mode.
The overall upward or downward pattern of the data in an annual time series will be
contained in the ________ component.
seasonal
cyclical
irregular
trend
the two samples are random.
the expected cell counts are ≥ 5 in all cells.
the two variables are dependent.
the two variables are independent.
Which of the following is true about the sampling distribution of the mean for a large
sample size?
It has a normal distribution with the same mean as the population but with a smaller
standard deviation.
It has a normal distribution with the same mean and standard deviation as the
population.
It has the same shape and mean as the population, but has a smaller standard
deviation.
It has the same shape, mean, and standard deviation as the population.
Which of the following is not true about the binomial distribution?
The probability of success is constant from trial to trial.
The random variable X is continuous.
The probability of success plus the probability of failure is one.
The trials are independent.
Suppose a 95% confidence interval for μ turns out to be (1,000, 2,100). Give a
definition of what it means to be “95% confident” in an inference.
In repeated sampling, 95% of the intervals constructed would contain the population
mean.
In repeated sampling, the population parameter would fall in the given interval 95%
of the time.
95% of the observations in the entire population fall in the given interval.
95% of the observations in the sample fall in the given interval.
A manager of a product sales group believes the number of sales made by an employee
depends on how many years that employee has been with the company and how he/she
scored on a business aptitude test. Which of the following would you perform to draw
conclusion on the belief?
multiple linear regression
one-way ANOVA
two-way ANVOA
simple linear regression
The statistical distribution used for testing the difference between two population
variances is the ________ distribution.
standardized normal
t
F
binomial
In its standardized form, the normal distribution
has a mean of 0 and a standard deviation of 1.
has a mean of 1 and a variance of 0.
cannot be used to approximate discrete probability distributions.
has an area equal to 0.5.
The probability that house sales will increase in the next 6 months is estimated to be
0.25. The probability that the interest rates on housing loans will go up in the same
period is estimated to be 0.74. The probability that house sales or interest rates will go
up during the next 6 months is estimated to be 0.89. The events of increase in house
sales and increase in interest rates in the next 6 months are
statistically independent.
mutually exclusive.
collectively exhaustive.
None of the above.
Which of the following is most likely a parameter as opposed to a statistic?
The proportion of trucks stopped yesterday that were cited for bad brakes.
The proportion of females registered to vote in a county.
The average score of the first five students completing an assignment.
The average height of people randomly selected from a database.
以下是五個與統計有關的英文專有名詞,請自行舉例說明每個名詞的意義
Statistical Model
以下是五個與統計有關的英文專有名詞,請自行舉例說明每個名詞的意義
Multicolinearity
以下是五個與統計有關的英文專有名詞,請自行舉例說明每個名詞的意義
p-value
以下是五個與統計有關的英文專有名詞,請自行舉例說明每個名詞的意義
Homogeneity of Variance
以下是五個與統計有關的英文專有名詞,請自行舉例說明每個名詞的意義
Bayes’ theorem
以下是五個與統計有關的英文專有名詞,請自行舉例說明每個名詞的意義
Scatter Plot
A partially completed ANOVA table for a completely randomized design is shown here.
A partially completed ANOVA table for a completely randomized design is shown here.
How many treatments are involved in the experiment?
The standard error of the slope for this estimated regression equation is ________.
The calculated t-statistic to test whether the regression slope is significant
is ________.
How much of the variability in pharmacists’ salary is accounted for by years of
experience?
The p-value associated with this statistic is < .001 . At the .05 level of significance.
What is the conclusion of the hypothesis test?
The Vardon Exploration Company is getting ready to leave for South America to
explore for oil. One piece of equipment requires 10 batteries that must operate for more
than 2 hours. The batteries being used have a 15 percent chance of failing within 2
hours. The exploration leader plans to take 15 batteries. Assuming that the conditions of
the binomial apply, what is the probability that the supply of batteries will contain
enough good ones to operate the equipment? (5%)
(若無法計算出最後結果,則開列計算公式即可)
The proportion of parts in an inventory that are outdated and no longer useful is thought
to be 0.10. To check this, a random sample of n =100 parts is selected and 14 are
found to be outdated. Based upon this information, what is the probability of 14 or more
outdated parts? (5%)
(若無法計算出最後結果,則開列計算公式即可)
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