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WPC 300 questions with verified solutions graded A+
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WPC 300 questions with verified solutions graded A+
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WPC 300 questions with verifiedsolutions graded A+
For a normal distribution mean is ___ to median - correct answer ✔✔equal
Standard deviation of a normal distribution is a ___? - correct answer ✔✔Measure of data dispersion
Which of the following is an example of a measure of dispersion? - correct answer ✔✔Variance
Which of the following is an example of a sample? - correct answer ✔✔The number of IT employees out
of all employees working in an office of Google
Which of the following describes the standard deviation? - correct answer ✔✔it is the square root of the
variance
The difference between the first and third quartiles is referred to as the ____ - correct answer
✔✔Interquartile range
According to statistical notation, what does E stand for? - correct answer ✔✔To act as a summation
operator
when two variables 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 iddle numbers
the ____ is the observation that occurs most frequently - correct answer ✔✔mode
, which of the following describes a positively skewed histogram? - correct answer ✔✔a histogram that
tails off towards the right
in order to reject the null hypothesis, the p value must be less than the - correct answer ✔✔alpha
the central limit theorem states that if the population is normally distributed, then the - correct 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? - correct answer ✔✔the t-distribution has a larger variance than the standard normal
distribution
which of the following proposition describes an existing theory or belief? - correct answer ✔✔null
hypothesis
when sample size increases - correct 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? - correct answer ✔✔3. 12/sqrt16=
12/4=3
Which of the following is a Type-I error? - correct 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? - correct answer ✔✔Anonymously data
collection by hiding ASU brand in the survey question
which of the following is a continuous random variable? - correct answer ✔✔the time to complete a
specific task
what is the confidence interval when the level of significance is 0.07? - correct answer ✔✔0.930
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