WPC 300 Final Exam UPDATED
QUESTIONS AND CORRECT ANSWERS
For a normal distribution mean is _______ to median.
-not equal
-greater than
-equal
-less than - CORRECT 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 - CORRECT 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. - CORRECT 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 - CORRECT ANSWER Center, spread and shape
The ________ is the observation that occurs most frequently.
-mode
,-mean
-outlier
-median - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT 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. - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWER Alpha
When sample size increases
-Confidence interval remains the same
-Standard deviation of the sample mean increases
-Confidence interval decreases
-Confidence interval increases - CORRECT 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 - CORRECT 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 -
CORRECT ANSWER The t-distribution has a larger variance than the standard normal
distribution
QUESTIONS AND CORRECT ANSWERS
For a normal distribution mean is _______ to median.
-not equal
-greater than
-equal
-less than - CORRECT 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 - CORRECT 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. - CORRECT 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 - CORRECT ANSWER Center, spread and shape
The ________ is the observation that occurs most frequently.
-mode
,-mean
-outlier
-median - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT 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. - CORRECT 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 - CORRECT 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 - CORRECT
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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWER Alpha
When sample size increases
-Confidence interval remains the same
-Standard deviation of the sample mean increases
-Confidence interval decreases
-Confidence interval increases - CORRECT 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 - CORRECT 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 -
CORRECT ANSWER The t-distribution has a larger variance than the standard normal
distribution
