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
Les avantages d'acheter des résumés chez Stuvia:
Qualité garantie par les avis des clients
Les clients de Stuvia ont évalués plus de 700 000 résumés. C'est comme ça que vous savez que vous achetez les meilleurs documents.
L’achat facile et rapide
Vous pouvez payer rapidement avec iDeal, carte de crédit ou Stuvia-crédit pour les résumés. Il n'y a pas d'adhésion nécessaire.
Focus sur l’essentiel
Vos camarades écrivent eux-mêmes les notes d’étude, c’est pourquoi les documents sont toujours fiables et à jour. Cela garantit que vous arrivez rapidement au coeur du matériel.
Foire aux questions
Qu'est-ce que j'obtiens en achetant ce document ?
Vous obtenez un PDF, disponible immédiatement après votre achat. Le document acheté est accessible à tout moment, n'importe où et indéfiniment via votre profil.
Garantie de remboursement : comment ça marche ?
Notre garantie de satisfaction garantit que vous trouverez toujours un document d'étude qui vous convient. Vous remplissez un formulaire et notre équipe du service client s'occupe du reste.
Auprès de qui est-ce que j'achète ce résumé ?
Stuvia est une place de marché. Alors, vous n'achetez donc pas ce document chez nous, mais auprès du vendeur lectknancy. Stuvia facilite les paiements au vendeur.
Est-ce que j'aurai un abonnement?
Non, vous n'achetez ce résumé que pour €21,94. Vous n'êtes lié à rien après votre achat.
