WPC 300 FINAL UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● When two variables are highly positively correlated, the correlation
coefficient will be _______.
Answer: close to 1
●● According to statistical notation, what does ∑ stand for?
Answer: to act as a summation operator
●● The ________ is the observation that occurs most frequently.
Answer: mode
●● The difference between the first and third quartiles is referred to as
the ____________.
Answer: interquartile range
●● Which of the following is an example of a measure of dispersion?
Answer: variance
●● Which of the following describes a positively skewed histogram?
,Answer: a histogram that tails off toward the right
●● Which of the following is true for a median?
Answer: 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?
Answer: The number of IT employees out of all employees working in
an office of Google
●● For a normal distribution mean is _______ to median.
Answer: equal
●● When sample size increases
Correct
Answer: Confidence interval decreases
●● Which of the following proposition describes an existing theory or
belief?
Answer: Null hypothesis
●● Which of the following is a Type-I error?
, Answer: 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
Answer: Alpha
●● What is the confidence interval when the level of significance is
0.07?
Answer: 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?
Answer: 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?
Answer: 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
QUESTIONS AND CORRECT ANSWERS
COMPLETE STUDY GUIDE
●● When two variables are highly positively correlated, the correlation
coefficient will be _______.
Answer: close to 1
●● According to statistical notation, what does ∑ stand for?
Answer: to act as a summation operator
●● The ________ is the observation that occurs most frequently.
Answer: mode
●● The difference between the first and third quartiles is referred to as
the ____________.
Answer: interquartile range
●● Which of the following is an example of a measure of dispersion?
Answer: variance
●● Which of the following describes a positively skewed histogram?
,Answer: a histogram that tails off toward the right
●● Which of the following is true for a median?
Answer: 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?
Answer: The number of IT employees out of all employees working in
an office of Google
●● For a normal distribution mean is _______ to median.
Answer: equal
●● When sample size increases
Correct
Answer: Confidence interval decreases
●● Which of the following proposition describes an existing theory or
belief?
Answer: Null hypothesis
●● Which of the following is a Type-I error?
, Answer: 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
Answer: Alpha
●● What is the confidence interval when the level of significance is
0.07?
Answer: 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?
Answer: 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?
Answer: 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
