WPC 300 Final Exam All Possible Questions and Answers
2023 Verified
Which of the following describes the standard deviation?
It is the square root of the variance.
When two variables are highly positively correlated, the correlation coefficient will be
_______.
close to 1
According to statistical notation, what does ∑ stand for?
to act as a summation operator
The ________ is the observation that occurs most frequently.
mode
The difference between the first and third quartiles is referred to as the ____________.
interquartile range
Which of the following is an example of a measure of dispersion?
variance
Which of the following describes a positively skewed histogram?
a histogram that tails off toward the right
Which of the following is true for a median?
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?
The number of IT employees out of all employees working in an office of Google
For a normal distribution mean is _______ to median.
equal
When sample size increases
Correct
Confidence interval decreases
Which of the following proposition describes an existing theory or belief?
Null hypothesis
, Which of the following is a Type-I error?
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
Alpha
What is the confidence interval when the level of significance is 0.07?
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?
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?
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
Sampling distribution of the mean will also be normal for any sample size
Which of the following is a continuous random variable?
The time to complete a specific task
Which of the following is a difference between the t-distribution and the standard normal
(z) distribution?
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.
Training and validation/testing
In logistic regression analysis, instead of Y as a dependent variable, we use a function of Y
called ________.
Logit
In classification problems, the primary source for accuracy estimation of the model is
________.
Confusion matrix
2023 Verified
Which of the following describes the standard deviation?
It is the square root of the variance.
When two variables are highly positively correlated, the correlation coefficient will be
_______.
close to 1
According to statistical notation, what does ∑ stand for?
to act as a summation operator
The ________ is the observation that occurs most frequently.
mode
The difference between the first and third quartiles is referred to as the ____________.
interquartile range
Which of the following is an example of a measure of dispersion?
variance
Which of the following describes a positively skewed histogram?
a histogram that tails off toward the right
Which of the following is true for a median?
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?
The number of IT employees out of all employees working in an office of Google
For a normal distribution mean is _______ to median.
equal
When sample size increases
Correct
Confidence interval decreases
Which of the following proposition describes an existing theory or belief?
Null hypothesis
, Which of the following is a Type-I error?
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
Alpha
What is the confidence interval when the level of significance is 0.07?
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?
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?
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
Sampling distribution of the mean will also be normal for any sample size
Which of the following is a continuous random variable?
The time to complete a specific task
Which of the following is a difference between the t-distribution and the standard normal
(z) distribution?
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.
Training and validation/testing
In logistic regression analysis, instead of Y as a dependent variable, we use a function of Y
called ________.
Logit
In classification problems, the primary source for accuracy estimation of the model is
________.
Confusion matrix
