WPC 300 EXAM 2 QUESTIONS AND ANSWERS
The ______ is the observation that occurs most frequently. - CORRECT ANSWER✅✅mode
Which of the following is an example of a measure of dispersion? - CORRECT ANSWER✅✅variance
For a normal distribution mean is ____ to median. - CORRECT ANSWER✅✅equal
Which of the following describes a positively skewed histogram? - CORRECT ANSWER✅✅a histogram
that tails off towards the right
According to statistical notation, what does ∑ stand for? - CORRECT ANSWER✅✅to act as a summation
operator
Standard deviation of a normal data distribution is a _____. - CORRECT ANSWER✅✅measure of data
dispersion
When two variable are highly positively correlated, the correlation coefficient will be _____. - CORRECT
ANSWER✅✅close to 1
Which of the following is true for a median? - CORRECT ANSWER✅✅For an even number of
observations, the median is the mean of the two middle numbers.
The difference between the first and third quartiles is referred to as the ____. - CORRECT
ANSWER✅✅interquartile range
Which of the following is an example for a sample? - CORRECT ANSWER✅✅The number of IT
employees out of all employees working in an office of Google.
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? - CORRECT ANSWER✅✅Anonymously data
collection by hiding ASU brand in the survey question.
, Which of the following proposition describes an existing theory or belief? - CORRECT ANSWER✅✅Null
hypothesis
Which of the following is a Type-I error? - CORRECT ANSWER✅✅The null hypothesis is actually true,
but the hypothesis test incorrectly rejects it.
What is the confidence interval when the level of significance is 0.07? - CORRECT ANSWER✅✅0.930
The central limit theorem states that if the population is normally distributed, then the - CORRECT
ANSWER✅✅sampling distribution of the mean will also be normal for any sample size
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? - CORRECT ANSWER✅✅3
(12/sqrt(16)=12/4=3)
In order to reject the null hypothesis, the p-value must be less than the - CORRECT ANSWER✅✅Alpha
Which of the following is a difference between the t-distribution and the standard normal (z)
distribution? - CORRECT ANSWER✅✅The t-distribution has a larger variance than the standard normal
distribution
Which of the following is a continuous random variable? - CORRECT ANSWER✅✅The time to complete
a specific task
When sample size increases - CORRECT ANSWER✅✅confidence interval decreases
Which of the following statement is true based on the following regression equation?
IQ = 4.0 + Reading Label * 5.6 - CORRECT ANSWER✅✅A unit point change in reading label will increase
IQ by 5.6 point
The ______ is the observation that occurs most frequently. - CORRECT ANSWER✅✅mode
Which of the following is an example of a measure of dispersion? - CORRECT ANSWER✅✅variance
For a normal distribution mean is ____ to median. - CORRECT ANSWER✅✅equal
Which of the following describes a positively skewed histogram? - CORRECT ANSWER✅✅a histogram
that tails off towards the right
According to statistical notation, what does ∑ stand for? - CORRECT ANSWER✅✅to act as a summation
operator
Standard deviation of a normal data distribution is a _____. - CORRECT ANSWER✅✅measure of data
dispersion
When two variable are highly positively correlated, the correlation coefficient will be _____. - CORRECT
ANSWER✅✅close to 1
Which of the following is true for a median? - CORRECT ANSWER✅✅For an even number of
observations, the median is the mean of the two middle numbers.
The difference between the first and third quartiles is referred to as the ____. - CORRECT
ANSWER✅✅interquartile range
Which of the following is an example for a sample? - CORRECT ANSWER✅✅The number of IT
employees out of all employees working in an office of Google.
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? - CORRECT ANSWER✅✅Anonymously data
collection by hiding ASU brand in the survey question.
, Which of the following proposition describes an existing theory or belief? - CORRECT ANSWER✅✅Null
hypothesis
Which of the following is a Type-I error? - CORRECT ANSWER✅✅The null hypothesis is actually true,
but the hypothesis test incorrectly rejects it.
What is the confidence interval when the level of significance is 0.07? - CORRECT ANSWER✅✅0.930
The central limit theorem states that if the population is normally distributed, then the - CORRECT
ANSWER✅✅sampling distribution of the mean will also be normal for any sample size
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? - CORRECT ANSWER✅✅3
(12/sqrt(16)=12/4=3)
In order to reject the null hypothesis, the p-value must be less than the - CORRECT ANSWER✅✅Alpha
Which of the following is a difference between the t-distribution and the standard normal (z)
distribution? - CORRECT ANSWER✅✅The t-distribution has a larger variance than the standard normal
distribution
Which of the following is a continuous random variable? - CORRECT ANSWER✅✅The time to complete
a specific task
When sample size increases - CORRECT ANSWER✅✅confidence interval decreases
Which of the following statement is true based on the following regression equation?
IQ = 4.0 + Reading Label * 5.6 - CORRECT ANSWER✅✅A unit point change in reading label will increase
IQ by 5.6 point
