WPC 300 Exam Questions and Answers Complete Solutions
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Course
WPC 300
Institution
WPC 300
For a normal distribution mean is ___ to median - Answer-equal
Standard deviation of a normal distribution is a ___? - Answer-Measure of data dispersion
Which of the following is an example of a measure of dispersion? - Answer-Variance
Which of the following is an example of a sample? - An...
WPC 300 Exam Questions and Answers
Complete Solutions
For a normal distribution mean is ___ to median - Answer-equal
Standard deviation of a normal distribution is a ___? - Answer-Measure of data
dispersion
Which of the following is an example of a measure of dispersion? - Answer-Variance
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
Which of the following describes the standard deviation? - Answer-it is the square root
of the variance
The difference between the first and third quartiles is referred to as the ____ - Answer-
Interquartile range
According to statistical notation, what does E stand for? - Answer-To act as a
summation operator
when two variables are highly positively correlated, the correlation coefficient will be
_____ - Answer-close to 1
which of the following is true for a median - Answer-for an even number of observations,
the median is the mean of the two iddle numbers
the ____ is the observation that occurs most frequently - Answer-mode
which of the following describes a positively skewed histogram? - Answer-a histogram
that tails off towards the right
in order to reject the null hypothesis, the p value must be less than the - Answer-alpha
the central limit theorem states that if the population is normally distributed, then the -
Answer-sampling distribution of the mean will also be normalized for any sample size
which of the following is a difference between the t-distribution and the standard normal
(z) distribution? - Answer-the t-distribution has a larger variance than the standard
normal distribution
which of the following proposition describes an existing theory or belief? - Answer-null
hypothesis
, when sample size increases - Answer-confidence interval decreases
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. 12/sqrt16= 12/4=3
Which of the following is a Type-I error? - Answer-the null hypothesis is actually true,
but the hypothesis test incorrectly rejects it
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
which of the following is a continuous random variable? - Answer-the time to complete a
specific task
what is the confidence interval when the level of significance is 0.07? - Answer-0.930
the unexplained variance in the regression analysis is also known as? - Answer-residual
variance
which of the following is true about multi-collinearity? - Answer-it is measured using a
measure called variance inflation factor (VIF)
Which of the following statement is true based on the following regression equation? IQ
= 4.0 + Reading Label * 5.6 - Answer-A unit point change in reading label will increase
IQ by 5.6 point
The value of R-squared always falls between ___________ and ____________
inclusive. - Answer-0 and 1
What would be the null hypothesis for testing a linear regression model with profit as the
dependent variable and sales as the independent variable? - Answer-There is no linear
relationship between profit and sales
Which of the following assumptions is not true for multiple linear regression? - Answer-
There will be a multi-collinearity effect
A market analyst is developing a regression model to predict monthly household
expenditures on groceries as a function of family size, household income, and
household neighborhood. The neighborhood variable in this model is ________. -
Answer-an independent variable
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