DTSA 5002 QUESTIONS WITH VERIFIED ANSWERS
Radiation from a Cesium-137 source is measured using a scintillation detector. The
detector absorbs the radiation and re-admits the energy as visible photons at a certain
rate commensurate with the half-life of Cesium-137.
Which of the following distributions may be used to best describe the number of photons
emitted during a one hour period of time? - Answers - Poisson
Question 2
Suppose George is eating at his favorite restaurant one cold winter afternoon. He sits at
his usual table, right by the window so he can entertain himself watching pedestrians
stroll down the sidewalk of the moderately busy city street. In between sips of his bitter
coffee, he notices that the occasional passerby slips on a small patch of ice right
outside the restaurant. Now, as opposed to being a more caring sort and warning the
waiter that a patch of ice needed salting, George continues to watch. He begins to think
over time that there is a more or less constant probability of any one person slipping. He
wants to know how many people might walk safely by before one slips. You can
assume that each pedestrian is either well spaced enough to avoid seeing the person
ahead of them fall or too engrossed in a cell phone to notice. Which below distribution
could be used? - Answers - Geometric
Question 3
Jerry is a high school student who works at the local arcade as his summer job. This
summer he's been assigned to the prize booth, doling out stuffed animals, keychains,
and multi-colored bouncy balls to kids with wads of tickets in their hands. Having been
there for several summers, Jerry's boss has let him in on some of the secrets of the
business. For example, one of the games consists of a ring that can light up. A single
dot of light speeds around the ring once tokens are put in the machine. If the player
clicks a button at just the right time to stop the light at the marked point, they win.
However, Jerry knows that even if the player pushes the button at just the right point,
the machine is setup to only stop the light at the marked spot with a fixed probability.
Jerry, standing there at the prize booth, wonders how many times out of ten tries a
player might win the game assuming they pressed the bu - Answers - Binomial
Jennifer is a construction worker at the site of a new skyscraper. The building-in-
progress sits next to the bridge that spans the river flowing through the heart of
downtown. After a hectic morning listening to the commands of her boss and the
complaints of her coworkers, she likes to take her lunch up to a partially finished upper
floor and watch cars pass on the bridge beneath her as she eats. After several days
watching the traffic go by, and with an interest in all things statistics, she begins to
wonder if she could model how many cars go by during her one hour lunch break.
Which distribution might be used for this? - Answers - Poisson
Question 5
Radiation from a Cesium-137 source is measured using a scintillation detector. The
detector absorbs the radiation and re-admits the energy as visible photons at a certain
rate commensurate with the half-life of Cesium-137.
Which of the following distributions may be used to best describe the number of photons
emitted during a one hour period of time? - Answers - Poisson
Question 2
Suppose George is eating at his favorite restaurant one cold winter afternoon. He sits at
his usual table, right by the window so he can entertain himself watching pedestrians
stroll down the sidewalk of the moderately busy city street. In between sips of his bitter
coffee, he notices that the occasional passerby slips on a small patch of ice right
outside the restaurant. Now, as opposed to being a more caring sort and warning the
waiter that a patch of ice needed salting, George continues to watch. He begins to think
over time that there is a more or less constant probability of any one person slipping. He
wants to know how many people might walk safely by before one slips. You can
assume that each pedestrian is either well spaced enough to avoid seeing the person
ahead of them fall or too engrossed in a cell phone to notice. Which below distribution
could be used? - Answers - Geometric
Question 3
Jerry is a high school student who works at the local arcade as his summer job. This
summer he's been assigned to the prize booth, doling out stuffed animals, keychains,
and multi-colored bouncy balls to kids with wads of tickets in their hands. Having been
there for several summers, Jerry's boss has let him in on some of the secrets of the
business. For example, one of the games consists of a ring that can light up. A single
dot of light speeds around the ring once tokens are put in the machine. If the player
clicks a button at just the right time to stop the light at the marked point, they win.
However, Jerry knows that even if the player pushes the button at just the right point,
the machine is setup to only stop the light at the marked spot with a fixed probability.
Jerry, standing there at the prize booth, wonders how many times out of ten tries a
player might win the game assuming they pressed the bu - Answers - Binomial
Jennifer is a construction worker at the site of a new skyscraper. The building-in-
progress sits next to the bridge that spans the river flowing through the heart of
downtown. After a hectic morning listening to the commands of her boss and the
complaints of her coworkers, she likes to take her lunch up to a partially finished upper
floor and watch cars pass on the bridge beneath her as she eats. After several days
watching the traffic go by, and with an interest in all things statistics, she begins to
wonder if she could model how many cars go by during her one hour lunch break.
Which distribution might be used for this? - Answers - Poisson
Question 5
