WPC 300 FINAL EXAM QUESTIONS WITH VERIFIED
ACCURATE ANSWERS
Which of the following describes the standard deviation? - Answers -It is the square
root of the variance.
When two variables are highly positively correlated, the correlation coefficient will be
_______. - Answers -close to 1
According to statistical notation, what does ∑ stand for? - Answers -to act as a
summation operator
The ________ is the observation that occurs most frequently. - Answers -mode
The difference between the first and third quartiles is referred to as the ____________. -
Answers -interquartile range
Which of the following is an example of a measure of dispersion? - Answers -variance
Which of the following describes a positively skewed histogram? - Answers -a
histogram that tails off toward the right
Which of the following is true for a median? - Answers -For an even number of
observations, the median is the mean of the two middle numbers
Which of the following is an example of a sample? - Answers -The number of IT
employees out of all employees working in an office of Google
For a normal distribution mean is _______ to median. - Answers -equal
When sample size increases
Correct - Answers -Confidence interval decreases
Which of the following proposition describes an existing theory or belief? - Answers -
Null hypothesis
Which of the following is a Type-I error? - Answers -The null hypothesis is actually true,
but the hypothesis test incorrectly rejects it.
In order to reject the null hypothesis, the p-value must be less than the - Answers -
Alpha
What is the confidence interval when the level of significance is 0.07? - Answers -0.930
, The WPC Sports Company has noted that the size of individual "customer order" is
normally distributed with a mean of $100 and standard deviation of $12. If a soccer
team of 16 players were to make the next batch of orders, what would be the standard
error of the mean? - Answers -3.00
You are collecting data via an online survey to improve education standard at ASU.
Which of the following methods will not result in data collection bias? - Answers -
Anonymously data collection by hiding ASU brand in the survey question.
The central limit theorem states that if the population is normally distributed, then the -
Answers -Sampling distribution of the mean will also be normal for any sample size
Which of the following is a continuous random variable? - Answers -The time to
complete a specific task
Which of the following is a difference between the t-distribution and the standard normal
(z) distribution? - Answers -The t-distribution has a larger variance than the standard
normal distribution.
In classification analysis, we typically split the data into two mutually exclusive sets,
known as ________, to investigate the strength of the developed model. - Answers -
Training and validation/testing
In logistic regression analysis, instead of Y as a dependent variable, we use a function
of Y called ________. - Answers -Logit
In classification problems, the primary source for accuracy estimation of the model is
________. - Answers -Confusion matrix
The ________ is often used to describe the performance of a classification model
applied to a set of test data for which the true outcomes are known. - Answers -
Confusion matrix
In classification analysis, we are determining the probability of an observation
________. - Answers -To be part of a certain class or not
In logistic regression, the dependent variable y is defined as: - Answers -Log (p/1-p)
Odds ratio is defined as ________, where p is the probability of success. - Answers -
p/1-p
Logistic regression is a specialized type of regression analysis that is designed to
predict ________ variables. - Answers -a binary categorical
ACCURATE ANSWERS
Which of the following describes the standard deviation? - Answers -It is the square
root of the variance.
When two variables are highly positively correlated, the correlation coefficient will be
_______. - Answers -close to 1
According to statistical notation, what does ∑ stand for? - Answers -to act as a
summation operator
The ________ is the observation that occurs most frequently. - Answers -mode
The difference between the first and third quartiles is referred to as the ____________. -
Answers -interquartile range
Which of the following is an example of a measure of dispersion? - Answers -variance
Which of the following describes a positively skewed histogram? - Answers -a
histogram that tails off toward the right
Which of the following is true for a median? - Answers -For an even number of
observations, the median is the mean of the two middle numbers
Which of the following is an example of a sample? - Answers -The number of IT
employees out of all employees working in an office of Google
For a normal distribution mean is _______ to median. - Answers -equal
When sample size increases
Correct - Answers -Confidence interval decreases
Which of the following proposition describes an existing theory or belief? - Answers -
Null hypothesis
Which of the following is a Type-I error? - Answers -The null hypothesis is actually true,
but the hypothesis test incorrectly rejects it.
In order to reject the null hypothesis, the p-value must be less than the - Answers -
Alpha
What is the confidence interval when the level of significance is 0.07? - Answers -0.930
, The WPC Sports Company has noted that the size of individual "customer order" is
normally distributed with a mean of $100 and standard deviation of $12. If a soccer
team of 16 players were to make the next batch of orders, what would be the standard
error of the mean? - Answers -3.00
You are collecting data via an online survey to improve education standard at ASU.
Which of the following methods will not result in data collection bias? - Answers -
Anonymously data collection by hiding ASU brand in the survey question.
The central limit theorem states that if the population is normally distributed, then the -
Answers -Sampling distribution of the mean will also be normal for any sample size
Which of the following is a continuous random variable? - Answers -The time to
complete a specific task
Which of the following is a difference between the t-distribution and the standard normal
(z) distribution? - Answers -The t-distribution has a larger variance than the standard
normal distribution.
In classification analysis, we typically split the data into two mutually exclusive sets,
known as ________, to investigate the strength of the developed model. - Answers -
Training and validation/testing
In logistic regression analysis, instead of Y as a dependent variable, we use a function
of Y called ________. - Answers -Logit
In classification problems, the primary source for accuracy estimation of the model is
________. - Answers -Confusion matrix
The ________ is often used to describe the performance of a classification model
applied to a set of test data for which the true outcomes are known. - Answers -
Confusion matrix
In classification analysis, we are determining the probability of an observation
________. - Answers -To be part of a certain class or not
In logistic regression, the dependent variable y is defined as: - Answers -Log (p/1-p)
Odds ratio is defined as ________, where p is the probability of success. - Answers -
p/1-p
Logistic regression is a specialized type of regression analysis that is designed to
predict ________ variables. - Answers -a binary categorical
