For a normal distribution mean is _______ to median.
-not equal
-greater than
-equal
-less than - Answer-equal
Which of the following describes a positively skewed histogram?
-a histogram with large kurtosis
-a histogram for which mean and mode values are the same.
-a histogram that tails...
WPC 300 Final Exam Questions and
Answers 2025-2025
For a normal distribution mean is _______ to median.
-not equal
-greater than
-equal
-less than - Answer-equal
Which of the following describes a positively skewed histogram?
-a histogram with large kurtosis
-a histogram for which mean and mode values are the same.
-a histogram that tails off towards the right
-a histogram that has no fluctuation in mass - Answer--a histogram that tails off towards
the right
Which of the following describes the standard deviation?
-It is the average of the greatest and least values in the data set.
-It is the square of variance
-It is the difference between the first and third quartiles of a data set.
-It is the square root of the variance. - Answer-It is the square root of the variance.
What are the three principles of describing data?
-Mean, median and mode
-Dispersion, range and standard deviation
-Centrality, dispersion and size
-Center, spread and shape - Answer-Center, spread and shape
The ________ is the observation that occurs most frequently.
-mode
-mean
-outlier
-median - Answer-mode
When two variables are highly positively correlated, the correlation coefficient will be
_______.
-close to 1
-close to -1
-close to 10
-close to 0 - Answer-close to 1
Standard deviation of a normal data distribution is a _______.
-measure of data shape
-measure of data dispersion
,-measure of data quality
-measure of data centrality - Answer-measure of data dispersion
Which of the following is an example of a sample?
-The population of Canada
-The number of members in the Democratic party
-The number of individuals who have a Ford car
-The number of IT employees out of all employees working in an office of Google -
Answer-The number of IT employees out of all employees working in an office of
Google
Which of the following is true for a median?
-A median is only meaningful for interval or ordinal data and not for ratio data
-For an even number of observations, the median is the mean of the two middle
numbers
-Median can be calculated no matter how the data is arranged
-Medians are affected by outliers - Answer-For an even number of observations, the
median is the mean of the two middle numbers
Which of the following is a Type-I error?
-The null hypothesis is actually true, but the hypothesis test incorrectly rejects it.
-The null hypothesis is actually true, and the hypothesis test correctly fails to reject it.
-The null hypothesis is actually false, but the test incorrectly fails to reject it.
-The null hypothesis is actually false, and the test correctly rejects it. - Answer-The null
hypothesis is actually true, but the hypothesis test incorrectly rejects it.
Which of the following proposition describes an existing theory or belief?
-Null hypothesis
-Alternative hypothesis
-Proportion
-Standard deviation - Answer-Null hypothesis
You are collecting data via an online survey to improve education standards at ASU.
Which of the following methods will not result in data collection bias?
-Some individuals are less likely to participate because they have strong opinions
against ASU education standards.
-Polls are completed only by visitors to the site
-Anonymously data collection by hiding ASU brand in the survey question.
-Those with an interest in your mission are the ones to participate in the survey -
Answer-Anonymously data collection by hiding ASU brand in the survey question.
What is the confidence interval when the level of significance is 0.07?
-0.093
-7%
-0.930
-0.970 - Answer-0.930
,The central limit theorem states that if the population is normally distributed, then the
-Sampling distribution of the mean will also be normal for any sample size
-Standard error of the mean will not vary from the population mean
-Sampling distribution of the mean will vary from the sample to sample
-Mean of the population can be calculated without using samples - Answer-Sampling
distribution of the mean will also be normal for any sample size
In order to reject the null hypothesis, the p-value must be less than the
-Alpha
-Standard deviation
-Degrees of freedom - Answer-Alpha
When sample size increases
-Confidence interval remains the same
-Standard deviation of the sample mean increases
-Confidence interval decreases
-Confidence interval increases - Answer-Confidence interval decreases
Which of the following is a continuous random variable?
-The number of new hires in a year
-The number bounced check from a bank
-The outcomes of rolling two dice
-The time to complete a specific task - Answer-The time to complete a specific task
Which of the following is a difference between the t-distribution and the standard normal
(z) distribution?
-The standard normal distribution is dependent on parameters like degree of freedom,
while t-distribution is not.
-The t-distribution cannot be calculated without a known standard deviation, while the
standard normal distribution can be.
-The t-distribution has a larger variance than the standard normal distribution
-The standard normal distributions' confidence levels are wider than those of the t-
distribution - Answer-The t-distribution has a larger variance than the standard normal
distribution
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?
-4.00
-3.00
-10.00
-3.46 - Answer-3.00
(sigma/sqrt(n) = 12/sqrt(16) = 12/4 = 3)
, What would be the null hypothesis for testing a linear regression model with profit as the
dependent variable and sales as the independent variable?
-There is a negative relationship between profit and sales.
-There is a positive relationship between profit and sales.
-There is a linear relationship between profit and sales that can be either positive or
negative.
-There is no linear relationship between profit and sales. - Answer-There is no linear
relationship between profit and sales.
Which of the following is true about multi-collinearity?
-The P-value reduces significantly, leading to rejection of the null hypothesis.
-The effect of an independent variable on the dependent variable becomes difficult to
isolate.
-It is measured using a measure called variance inflation factor (VIF).
-The regression coefficients become clearer and are easier to interpret. - Answer-It is
measured using a measure called variance inflation factor (VIF).
The correlation coefficient between the age of a vehicle and the money spent to repair it
is 0.9. Which of the following statement is true?
-81% of money spent on repairs is explained by the age of the vehicle
-81% of the variation in the money spent on repairs is explained by the age of the
vehicle
-90% of the repair cost will be explained by the age of the vehicle
-90% of the money spent on repair is explained by the age of the vehicle - Answer-81%
of the variation in the money spent on repairs is explained by the age of the vehicle
A manager wishes to predict the annual cost (y) of an automobile based on the number
of miles (x) driven. The following model was developed: y = $1500 + 0.36x. If a car is
driven 15000 miles in a year, the model predicts the annual cost of the car to be:
-$2090
-$7400
-$3850
-$6900 - Answer-$6900
The value of R-Squared always falls between ________ and ________, inclusive.
- 0 and -1
- 0 and 1
- -infinity to + infinity
- -1 and +1 - Answer-0 and 1
The unexplained variance in the regression analysis is also known as:
-Residual variance
-Regression variance
-Total variance
-Predicted variance - Answer-Residual variance
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