QMB 3250 EXAM UPDATED QUESTIONS WITH
100% CORRECT SOLUTIONS!!
In simple exponential smoothing, which is smoother, a high alpha or a low alpha?
Low
What are the key differences between trends and seasonal components in time series data?
Tredns are a consistent pattern (either linerar or curves) that approach either a negative or
positive directuon; Seasonal components are flucuation in data that occur around the same time
every period
For a time series for simple moving average, a longer period with be _____ than a shorter
period because longer periods respond more _______
Smoother; slowly
If you were dealing with a data set that fluctuates quarterly, what type of method would be
best?
Autoregressive models
If you are dealing with a data set that consists of sales with a consistent percentage
increase, what type of method would be best?
Multiplicative regression model
Suppose you ran a additive regression based model of price vs time (years) and the point
estimate for change in price per year was 1140. Interpret the slope
The price tended to increase by 1140 dollars per year
, True/False: autoaggressive models can do a better job than other smoothing models at
modeling quarterly trends.
True
What is the correct alternative hypothesis for One way ANOVA test?
Ha: at least one of the population means is different
UF is tired of being known as the gators, so they decide to try out different mascots (Crocs,
Caymans, and Lizards). "The Florida", the saying normally spoken before Gators, is kept
the same but the new mascots are randomly assigned. 100 US alumni or sat down and read
each mascot name in a random order, and are asked to rate them 1-3.
What is the factor and levels of the scenario?
Factor: mascot
Levels: crocs, caymans and Lizards
What differentiates single blind experiments from double blind experiments?
Single blind means the participants do not know what treatment they received
A large movie theater chain was interested in seeing if they could increase sales by adding a
monthly subscription service that allowed subscribers to see an unlimited amount of movies
every month, instead of paying for tickets for each movie. To test this, they really randomly
selected half of their 400 theaters and introduce the new service while the other half did not
receive the service. Which of these answers represents an element of replication in the
study?
100% CORRECT SOLUTIONS!!
In simple exponential smoothing, which is smoother, a high alpha or a low alpha?
Low
What are the key differences between trends and seasonal components in time series data?
Tredns are a consistent pattern (either linerar or curves) that approach either a negative or
positive directuon; Seasonal components are flucuation in data that occur around the same time
every period
For a time series for simple moving average, a longer period with be _____ than a shorter
period because longer periods respond more _______
Smoother; slowly
If you were dealing with a data set that fluctuates quarterly, what type of method would be
best?
Autoregressive models
If you are dealing with a data set that consists of sales with a consistent percentage
increase, what type of method would be best?
Multiplicative regression model
Suppose you ran a additive regression based model of price vs time (years) and the point
estimate for change in price per year was 1140. Interpret the slope
The price tended to increase by 1140 dollars per year
, True/False: autoaggressive models can do a better job than other smoothing models at
modeling quarterly trends.
True
What is the correct alternative hypothesis for One way ANOVA test?
Ha: at least one of the population means is different
UF is tired of being known as the gators, so they decide to try out different mascots (Crocs,
Caymans, and Lizards). "The Florida", the saying normally spoken before Gators, is kept
the same but the new mascots are randomly assigned. 100 US alumni or sat down and read
each mascot name in a random order, and are asked to rate them 1-3.
What is the factor and levels of the scenario?
Factor: mascot
Levels: crocs, caymans and Lizards
What differentiates single blind experiments from double blind experiments?
Single blind means the participants do not know what treatment they received
A large movie theater chain was interested in seeing if they could increase sales by adding a
monthly subscription service that allowed subscribers to see an unlimited amount of movies
every month, instead of paying for tickets for each movie. To test this, they really randomly
selected half of their 400 theaters and introduce the new service while the other half did not
receive the service. Which of these answers represents an element of replication in the
study?
