ECN 221 Final Exam – Arizona State University – Comprehensive Multiple-Choice Review for Core Statistical Concepts

ECN 221 Final Exam – Arizona State University
– Comprehensive Multiple-Choice Review for
Core Statistical Concepts

When using Excel's BINOM.DIST function, one should choose TRUE for the fourth input if

-a probability is desired

-the correct answer is desired

-the expected value is desired

-the standard deviation is desired

-a cumulative probability is desired a cumulative probability is desired



For any continuous random variable, the probability that the random variable takes on exactly a
specific value is

-1

-any value between 0 and 1

-.50

-0

-1/x 0



The mean of a standard normal probability distribution _____.

-None of the answers is correct.

-can be any value

-is always equal to 1

-can be any value as long as it is positive None of the answers is correct. (must always be
0)

, A probability distribution for all possible values of a sample statistic is known as a

-sample statistic

-simple random sample

-sampling distribution

-parameter sampling distribution



As the degrees of freedom increase, the t distribution approaches the _____ distribution

-normal

-p

-empirical

-uniform

-exponential normal



As the number of degrees of freedom for a t distribution increases, the difference between the t
distribution and the standard normal distribution

-stays the same

-None of the answers is correct.

-becomes smaller

-becomes larger becomes smaller

The numerical value of the standard deviation can never be

-larger than the variance

-negative

-zero

-all of the answers are correct negative