MSIS 3223 OKSTATE EXAM 2 WITH
100% CORRECT ANSWERS
Which of the following is true about the classical definition of probability? - ANS-If the
process that generates the outcomes is known, probabilities can be deducted from
theoretical arguments
Which of the following is a continuous random variable? - ANS-the time to complete a
specific task
The ___ of a random variable corresponds to the notion of the mean, or average, for a
sample - ANS-expected value
Use the spreadsheet data below to respond to the question... what is the probability that
a respondent is Female and prefers math? - ANS-2/15
What is the probability that a respondent is female and prefers brand 3? - ANS-.2
What is the conditional probability that a respondent is female given that she prefers
brand 3? - ANS-.2/.45
Which statement is NOT true? - ANS-Gender and brand preference are independent
For a normal distribution with mean 25 and standard deviation 10, what is the probability
that the random variable gets a value less than 25, P(X<25)? - ANS-0.5
Which of the following is a weighted average of the squared deviations from the
expected value? - ANS-variance
Which of the following is true about the probability density functions? - ANS-It calculates
the probability of a random variable lying within a certain interval
Which of the following is true of normal distributions? - ANS-The mean, median, and
mode are all equal
A regression model that involves a single independent variable is called ____ - ANS-
simple regression
Regression models of ____ data focus on predicting the future - ANS-time-series
100% CORRECT ANSWERS
Which of the following is true about the classical definition of probability? - ANS-If the
process that generates the outcomes is known, probabilities can be deducted from
theoretical arguments
Which of the following is a continuous random variable? - ANS-the time to complete a
specific task
The ___ of a random variable corresponds to the notion of the mean, or average, for a
sample - ANS-expected value
Use the spreadsheet data below to respond to the question... what is the probability that
a respondent is Female and prefers math? - ANS-2/15
What is the probability that a respondent is female and prefers brand 3? - ANS-.2
What is the conditional probability that a respondent is female given that she prefers
brand 3? - ANS-.2/.45
Which statement is NOT true? - ANS-Gender and brand preference are independent
For a normal distribution with mean 25 and standard deviation 10, what is the probability
that the random variable gets a value less than 25, P(X<25)? - ANS-0.5
Which of the following is a weighted average of the squared deviations from the
expected value? - ANS-variance
Which of the following is true about the probability density functions? - ANS-It calculates
the probability of a random variable lying within a certain interval
Which of the following is true of normal distributions? - ANS-The mean, median, and
mode are all equal
A regression model that involves a single independent variable is called ____ - ANS-
simple regression
Regression models of ____ data focus on predicting the future - ANS-time-series
