ECN 221 ASU final Question and
answers verified to pass 2025
The numerical value of the standard deviation can never be
-larger than the variance
-negative
-zero
-all of the answers are correct - correct answer ✔negative
the interquartile range is used as a measure of variability to overcome what
difficulty of the range?
-the range is influenced too much by extreme values
-the range is difficult to compute
-the sum of the range variances is zero
-the range is negative - correct answer ✔the range is influence too much by
extreme values
in statistics, what does IQR mean
-individual quartile relativity
-individual quantity range
-inter-quartile range
-inter-quantity relativity - correct answer ✔inter-quartile range
revised probabilities of events based on additional information are
-marginal probabilities
-complementary probabilities
, -posterior probabilities
-joint probabilities - correct answer ✔posterior probabilities
the mean of a standard normal probability distribution
-can be any value
-none of the answers is correct.
-is always equal to 1
-can be any value as long as it is positive - correct answer ✔-none of the
answers is correct.
which of the following is not a characteristic of the normal probability
distribution
-the distribution is symmetrical.
-the standard deviation must be 1.
-the mean of the distribution can be negative, zero, or positive.
-the mean, median, and mode are equal. - correct answer ✔the standard
deviation must be 1
the purpose of statistical inference is to provide information about the
-experiment based on the information in the population
-mean of the sample based upon the mean of the population
-population based upon information contained in the population
-sample based upon information contained in the population
-population based upon information contained in the sample - correct answer
✔population based upon information contained in the sample
the rejection region for a one-tailed hypothesis test
answers verified to pass 2025
The numerical value of the standard deviation can never be
-larger than the variance
-negative
-zero
-all of the answers are correct - correct answer ✔negative
the interquartile range is used as a measure of variability to overcome what
difficulty of the range?
-the range is influenced too much by extreme values
-the range is difficult to compute
-the sum of the range variances is zero
-the range is negative - correct answer ✔the range is influence too much by
extreme values
in statistics, what does IQR mean
-individual quartile relativity
-individual quantity range
-inter-quartile range
-inter-quantity relativity - correct answer ✔inter-quartile range
revised probabilities of events based on additional information are
-marginal probabilities
-complementary probabilities
, -posterior probabilities
-joint probabilities - correct answer ✔posterior probabilities
the mean of a standard normal probability distribution
-can be any value
-none of the answers is correct.
-is always equal to 1
-can be any value as long as it is positive - correct answer ✔-none of the
answers is correct.
which of the following is not a characteristic of the normal probability
distribution
-the distribution is symmetrical.
-the standard deviation must be 1.
-the mean of the distribution can be negative, zero, or positive.
-the mean, median, and mode are equal. - correct answer ✔the standard
deviation must be 1
the purpose of statistical inference is to provide information about the
-experiment based on the information in the population
-mean of the sample based upon the mean of the population
-population based upon information contained in the population
-sample based upon information contained in the population
-population based upon information contained in the sample - correct answer
✔population based upon information contained in the sample
the rejection region for a one-tailed hypothesis test
