Question

Given the plot of normal distributions A and B below, which of the following statements is true? Select all correct answers.

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Which of the following are true about all normal distributions?
Check all that apply
A. They are defined by the mean and standard
deviation.
B. They are bimodal.
C. They are categorically sharp.
D. They are all centered at zero.
The z-score corresponding to an observed value of a variable tells
you the number of standard deviations that the observation is from
the mean
A. True
B. False
A positive z-score indicates that the observation is
A. above the mean...

1) Which of the following is true of normal
distributions?
A) The median and mode are equal.
B) Its measure of skewness is always greater than
1.
C) The range of the random variable X is
bounded.
D) Mathematical formulas make it easier to compute
normal distributions.
2) Sampling errors occur because the means cannot be
accurately estimated using samples. True or False?

Which of the following statements is not true for sampling
distributions?
a. A sampling distribution is necessary for making confidence
statements about an unknown population parameter.
b. A sampling distribution depends on the nature of the
population being sampled.
c. When sampling at random from a normal population, the
sampling distribution for the sample average is a normal
distribution.
d. None of the above.
AND
TRUE or FALSE
Assume a random sample of size n is from a normal population....

Which of the following statements is not true? Select the
correct answer below:
A) a monopolist faces a downward sloping demand function
B)a perfectly competitive firm can choose any quantity it wants
at the given market price
C)a monopolist has the power to charge any price it wants
regardless of the choices of consumers
D)a perfectly competitive firm cannot influence the market
price

Which of the statements below is true?
a. The graphic plot of project NPV against discount rate is
called the NPV profile
b. NPV profile is always downward sloping, i.e., NPV
decreases with higher discount rate
c. At the intercept point of the NPV profile with the horizontal
axis, the project IRR is zero.
d. All of the above
e. None of the above

Consider the following statements concerning the normal
distribution.
(i) The normal distribution is symmetric and unimodal.
(ii) The normal distribution is useful for approximating some
discrete distributions.
(iii) Only knowledge of the mean and variance is required to
completely specify a normal distribution.
A.
Only (i) and (ii) are true.
B.
All of (i), (ii) and (iii) are true.
C.
Only (i) is true.
D.
Only (i) and (iii) are true.

Answer the following about T-Test & T-distributions:
1. Which of the following statements related to the
t-distribution is not true?
Select one:
a. Since the population standard deviation is usually unknown,
the standard error of the sample mean is estimated using the sample
standard deviation as an estimator for the population standard
deviation. The formula is s/sqrt(n).
b. The population must be t-distributed in order to use the
t-distribution.
c. Like the Normal distribution, the t-distribution is symmetric
and unimodal....

Which of the following statements is not true about continuous
probability distributions?
Select one:
a. The probability of any event is the area under the density
curve over the range of values that make up the event.
b. The total area under the density curve must be exactly 1.
c. If X is a continuous random variable taking values
between 0 and 500, then
P(X > 200) = P(X ? 200).
d. There are no disjoint events in continuous probability...

Which of the following statements about Normal quantile plots is
(are) FALSE?
A) In constructing a Normal quantile plot each data point is
plotted against its corresponding Normal score.
B) The Normal quantile plot is a very useful graphical tool for
assessing the adequacy of the Normal model.
C) If the points on a Normal quantile plot lie close to a
straight line, the plot indicates that the Normal model is an
adequate representation for the data.
D) Because you...

In a regression
analysis, which of the following statements are true?
I. A residual plot with no pattern indicates a weak linear
relationship.
II. A data point is influential if omitting it from the analysis
gives a very different regression model.
a.
I only.
b.
II only
c.
I and II
d.
Neither statement is
true

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