WPC 300 FINAL EXAM WITH
CORRECT ANSWERS GRADED A+
Which of the following describes the standard deviation? - Ans--It is the
square root of the variance.
When two variables are highly positively correlated, the correlation
coefficient will be _______. - Ans--close to 1
According to statistical notation, what does ∑ stand for? - Ans--to act as a
summation operator
The ________ is the observation that occurs most frequently. - Ans--mode
The difference between the first and third quartiles is referred to as the
____________. - Ans--interquartile range
Which of the following is an example of a measure of dispersion? - Ans--
variance
Which of the following describes a positively skewed histogram? - Ans--a
histogram that tails off toward the right
Which of the following is true for a median? - Ans--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? - Ans--The number of IT
employees out of all employees working in an office of Google
For a normal distribution mean is _______ to median. - Ans--equal
When sample size increases
Correct - Ans--Confidence interval decreases
, Which of the following proposition describes an existing theory or belief? -
Ans--Null hypothesis
Which of the following is a Type-I error? - Ans--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 - Ans--
Alpha
What is the confidence interval when the level of significance is 0.07? - Ans--
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? - Ans--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?
- Ans--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 - Ans--Sampling distribution of the mean will also be normal for any
sample size
Which of the following is a continuous random variable? - Ans--The time to
complete a specific task
Which of the following is a difference between the t-distribution and the
standard normal (z) distribution? - Ans--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. - Ans--Training and validation/testing
CORRECT ANSWERS GRADED A+
Which of the following describes the standard deviation? - Ans--It is the
square root of the variance.
When two variables are highly positively correlated, the correlation
coefficient will be _______. - Ans--close to 1
According to statistical notation, what does ∑ stand for? - Ans--to act as a
summation operator
The ________ is the observation that occurs most frequently. - Ans--mode
The difference between the first and third quartiles is referred to as the
____________. - Ans--interquartile range
Which of the following is an example of a measure of dispersion? - Ans--
variance
Which of the following describes a positively skewed histogram? - Ans--a
histogram that tails off toward the right
Which of the following is true for a median? - Ans--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? - Ans--The number of IT
employees out of all employees working in an office of Google
For a normal distribution mean is _______ to median. - Ans--equal
When sample size increases
Correct - Ans--Confidence interval decreases
, Which of the following proposition describes an existing theory or belief? -
Ans--Null hypothesis
Which of the following is a Type-I error? - Ans--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 - Ans--
Alpha
What is the confidence interval when the level of significance is 0.07? - Ans--
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? - Ans--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?
- Ans--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 - Ans--Sampling distribution of the mean will also be normal for any
sample size
Which of the following is a continuous random variable? - Ans--The time to
complete a specific task
Which of the following is a difference between the t-distribution and the
standard normal (z) distribution? - Ans--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. - Ans--Training and validation/testing
