Stat 210 final questions with verified
answers to pass
Stimulus
Hurricane Harvey was an active tropical cyclone that became a category 4 hurricane late on
August 25, 2017 and then made landfall near Rockport, Texas, causing unprecedented and
catastrophic flooding in southeastern Texas. It was the first major hurricane to make landfall in
the United States since Wilma in 2005, ending a record 12-year period with no major hurricanes
making landfall in the United States. Harvey was also the first hurricane to hit the state of Texas
since Ike in 2008, and the strongest to hit the state since Carla in 1961. In addition, it was the
strongest hurricane in the Gulf of Mexico since Hurricane Rita in 2005 and the strongest to make
landfall in the United States since Hurricane Charley in 2004. It joined Matthew as one of only
two U.S. hurricanes to cause an extreme wind warning to be issued, indicating "tornado-like
winds" within the storm, including isolated tornadoes. - correct answer ✔✔For all named
storms that have made landfall in the United States since 2000, of interest is to determine the
mean sustained wind speed of the storms at the time they made landfall. In this scenario, what
is the population of interest?
All named storms that have made landfall in the United States since 2000
Based on the information in question 1, what is the parameter of interest? - correct answer
✔✔Mu = The mean sustained wind speed of the storms at the time they made landfall
Consider the information presented in question 1. What type of characteristic is the mean
sustained wind speed of the storms at the time they made landfall? - correct answer
✔✔Continuous Quantitative Variable
The amount of damage done by a named storm is impacted in part by the number of days the
storm stays over land once it makes landfall. What type of characteristic is the number of days
that a storm stays over land once it makes landfall? - correct answer ✔✔Discrete quantitative
variable
,Consider the information presented in question 1. Suppose it is known that among all named
storms that have made landfall in the United States since 2000, 31% of them stay over land for 3
or more days once they make landfall. In this scenario, is 31% an example of a parameter or a
statistic? - correct answer ✔✔Parameter
Suppose a sample of 25 named storms that have made landfall in the United States since 2000
is chosen. The sample is purposely selected such that all the storms made landfall in either
Texas or Louisiana; storms that made landfall in other states are excluded from the sample. In
this scenario, what type of bias could this cause? - correct answer ✔✔Selection bias
New Situation: For all named storms since 2000, of interest is to determine the proportion of
these named storms that did make landfall in the United States. Based on this information, what
is the population of interest? - correct answer ✔✔All named storms since 2000
Based on the information in question 7, what is the parameter of interest? - correct answer
✔✔Pi = The proportion of all named storms since 2000 that did make landfall in the United
States
A sample of 20 named storms since 2000 was selected. In this sample, 6 of the storms, or 30%,
did make landfall in the United States. In this scenario, is 30% an example of a parameter or a
statistic? - correct answer ✔✔Statistic
To select the sample described in question 9 the following was done. First, a random sample of
5 years between 2000 and 2017 was selected. Then for each of these 5 years, a random sample
of 4 named storms was selected. What type of sampling procedure is this an example of? -
correct answer ✔✔Multistage random sampling
Consider the information in question 9 and the sampling procedure described in question 10.
Suppose one of the years selected was 2006, and the meteorologist tracking storms that year
was not accurate in identifying whether the storm made landfall in the United States or not.
What type of bias could this cause? - correct answer ✔✔Response bias
, Each year the proportion of named storms that make landfall in the United States is calculated.
Based on this, the proportion of named storms that make landfall in the United States is what
type of characteristic? - correct answer ✔✔Continuous quantitative variable
For all named storms since 2000, it is recorded for each whether it made landfall in the United
States or not (yes or no). Whether a named storm made landfall in the United States or not is
what type of characteristic? - correct answer ✔✔Categorical variable
Starting in 2000 and going through Hurricane Harvey in 2017, there have been 464 named
storms in the past 18 years. Suppose we want to select a simple random sample of 12 named
storms for further analysis. Each named storm is associated with a three-digit number between
001 and 464.
The lists of numbers below are rows of a table of random digits; please start at the far left of the
first row and select a simple random sample of 12 named storms out of the total of 464 named
storms. All that is required is to simply give the numbers of the 12 named storms that were
chosen using the rows of random digits below
135599 201944 313927 404838 545902 603410 752229 893865 911299057273 105820 298223
304367 459035 522957 632850
720854 829109 985767 059105 138502 248503 358239 447728 598347 603494 - correct
answer ✔✔Using the lines of random digits provided, the list of 12 numbers selected is as
follows: 135, 201, 313, 404, 410, 229, 299, 057, 273, 105, 298, 223
New Situation: Many meteorologists track named storms, particularly those that have the
potential to make landfall; some meteorologists are more successful in predicting the track of
the storm than others. Suppose all currently employed meteorologists are identified as either
being employed by the U.S. National Weather Service, employed by a local television station
within the United States, or employed in a country other than the United States. In this
scenario, what is the population of interest? - correct answer ✔✔All currently employed
meteorologists
answers to pass
Stimulus
Hurricane Harvey was an active tropical cyclone that became a category 4 hurricane late on
August 25, 2017 and then made landfall near Rockport, Texas, causing unprecedented and
catastrophic flooding in southeastern Texas. It was the first major hurricane to make landfall in
the United States since Wilma in 2005, ending a record 12-year period with no major hurricanes
making landfall in the United States. Harvey was also the first hurricane to hit the state of Texas
since Ike in 2008, and the strongest to hit the state since Carla in 1961. In addition, it was the
strongest hurricane in the Gulf of Mexico since Hurricane Rita in 2005 and the strongest to make
landfall in the United States since Hurricane Charley in 2004. It joined Matthew as one of only
two U.S. hurricanes to cause an extreme wind warning to be issued, indicating "tornado-like
winds" within the storm, including isolated tornadoes. - correct answer ✔✔For all named
storms that have made landfall in the United States since 2000, of interest is to determine the
mean sustained wind speed of the storms at the time they made landfall. In this scenario, what
is the population of interest?
All named storms that have made landfall in the United States since 2000
Based on the information in question 1, what is the parameter of interest? - correct answer
✔✔Mu = The mean sustained wind speed of the storms at the time they made landfall
Consider the information presented in question 1. What type of characteristic is the mean
sustained wind speed of the storms at the time they made landfall? - correct answer
✔✔Continuous Quantitative Variable
The amount of damage done by a named storm is impacted in part by the number of days the
storm stays over land once it makes landfall. What type of characteristic is the number of days
that a storm stays over land once it makes landfall? - correct answer ✔✔Discrete quantitative
variable
,Consider the information presented in question 1. Suppose it is known that among all named
storms that have made landfall in the United States since 2000, 31% of them stay over land for 3
or more days once they make landfall. In this scenario, is 31% an example of a parameter or a
statistic? - correct answer ✔✔Parameter
Suppose a sample of 25 named storms that have made landfall in the United States since 2000
is chosen. The sample is purposely selected such that all the storms made landfall in either
Texas or Louisiana; storms that made landfall in other states are excluded from the sample. In
this scenario, what type of bias could this cause? - correct answer ✔✔Selection bias
New Situation: For all named storms since 2000, of interest is to determine the proportion of
these named storms that did make landfall in the United States. Based on this information, what
is the population of interest? - correct answer ✔✔All named storms since 2000
Based on the information in question 7, what is the parameter of interest? - correct answer
✔✔Pi = The proportion of all named storms since 2000 that did make landfall in the United
States
A sample of 20 named storms since 2000 was selected. In this sample, 6 of the storms, or 30%,
did make landfall in the United States. In this scenario, is 30% an example of a parameter or a
statistic? - correct answer ✔✔Statistic
To select the sample described in question 9 the following was done. First, a random sample of
5 years between 2000 and 2017 was selected. Then for each of these 5 years, a random sample
of 4 named storms was selected. What type of sampling procedure is this an example of? -
correct answer ✔✔Multistage random sampling
Consider the information in question 9 and the sampling procedure described in question 10.
Suppose one of the years selected was 2006, and the meteorologist tracking storms that year
was not accurate in identifying whether the storm made landfall in the United States or not.
What type of bias could this cause? - correct answer ✔✔Response bias
, Each year the proportion of named storms that make landfall in the United States is calculated.
Based on this, the proportion of named storms that make landfall in the United States is what
type of characteristic? - correct answer ✔✔Continuous quantitative variable
For all named storms since 2000, it is recorded for each whether it made landfall in the United
States or not (yes or no). Whether a named storm made landfall in the United States or not is
what type of characteristic? - correct answer ✔✔Categorical variable
Starting in 2000 and going through Hurricane Harvey in 2017, there have been 464 named
storms in the past 18 years. Suppose we want to select a simple random sample of 12 named
storms for further analysis. Each named storm is associated with a three-digit number between
001 and 464.
The lists of numbers below are rows of a table of random digits; please start at the far left of the
first row and select a simple random sample of 12 named storms out of the total of 464 named
storms. All that is required is to simply give the numbers of the 12 named storms that were
chosen using the rows of random digits below
135599 201944 313927 404838 545902 603410 752229 893865 911299057273 105820 298223
304367 459035 522957 632850
720854 829109 985767 059105 138502 248503 358239 447728 598347 603494 - correct
answer ✔✔Using the lines of random digits provided, the list of 12 numbers selected is as
follows: 135, 201, 313, 404, 410, 229, 299, 057, 273, 105, 298, 223
New Situation: Many meteorologists track named storms, particularly those that have the
potential to make landfall; some meteorologists are more successful in predicting the track of
the storm than others. Suppose all currently employed meteorologists are identified as either
being employed by the U.S. National Weather Service, employed by a local television station
within the United States, or employed in a country other than the United States. In this
scenario, what is the population of interest? - correct answer ✔✔All currently employed
meteorologists
