BUAL 2600 QUESTIONS AND ANSWERS SURE A+
✔✔greater - ✔✔the area under the normal curve z=0 and z=1 is ________ than the
area under the normal curve between z=1 and z=2
✔✔uniform, normal, and exponential - ✔✔what are 3 continuous probability
distributions?
✔✔0 - ✔✔if [a,b] denotes an arbitrary interval of numbers on the real number line, find
the probability when P(x=a)
✔✔means - ✔✔the central limit theorem states that as the sample size increases, the
distribution of the sample ________ approaches the normal distribution
✔✔increases, decreases - ✔✔as the sample size ________, the variation of the
sampling distribution of the mean ________
✔✔np is greater than or equal to 5 and n(1-p) is greater than or equal to 5 - ✔✔the
population of all sample proportions has a normal distribution if the sample size (n) is
sufficiently large. the rule of thumb for ensuring that n is sufficiently large is...
✔✔increases, normal - ✔✔for non-normal populations, as the sample size (n)
________, the distribution of sample means approaches a ________ distribution
✔✔convenience sampling - ✔✔a restaurant leaves comment cards on all of its tables
and encourages customers to participate in a brief survey to learn about their overall
experience. this is an example of what type of sampling?
✔✔convenience sampling - ✔✔a quality control worker at a factory selects the first 10
items she sees as her sample for the day. this is an example of what kind of sampling?
, ✔✔finite population (you count how many) - ✔✔a population that consists of all the
customers that will use the drive-thru of the local fast food restaurant is what type of
population?
✔✔convenience sampling - ✔✔what kind of sampling consists of selecting elements
because they are easy to sample?
✔✔graphical description analytics - ✔✔what type of analytics uses traditional or newer
graphs to present visual summaries of business information?
✔✔linear regression, decision trees, and neural networks - ✔✔what are 3 supervised
learning techniques in predictive analytics?
✔✔strata - ✔✔what are non-overlapping groups of similar elements in a population
called?
✔✔ordinal - ✔✔an identification of police officers by rank would represent an ________
level of measurement
✔✔simple random sample - ✔✔you want to select a sample of 100 employees from
company X. you assign a number to every employee in the company database from 1 to
100. and use a random number generator to select 100 numbers. this is an example of
what type of sample?
✔✔systematic sampling - ✔✔all employees of a company are listed in alphabetical
order. from the first 10 numbers, you randomly select a starting point of number 6. from
number 6 onwards, every 10th person on the list is selected (6, 16, 26, etc.) and you
end up with a sample of 100 people. this is an example of what type of sampling?
✔✔stratified sampling - ✔✔a company has 800 female employees and 200 male
employees. you want to ensure that the sample reflects the gender balance of the
company, so you sort the population into 2 strata based on gender. then you use
random sampling on each group, selecting 80 women and 20 men, which gives you a
representative sample of 100 people. this is an example of what type of sampling?
✔✔dashboard - ✔✔what is a graphical representation of the current status and
historical trends of a business's key performance indicators?
✔✔bullet graph - ✔✔as a business owner, I have requested my staff to develop a set of
dashboards that can be used by the public to show wait time at each of my 4 local
coffee shops at peak times during the day and whether the time is short, medium, or
long. what type of graphical display would be the best choice?
✔✔ogive - ✔✔graph of a cumulative distribution
✔✔greater - ✔✔the area under the normal curve z=0 and z=1 is ________ than the
area under the normal curve between z=1 and z=2
✔✔uniform, normal, and exponential - ✔✔what are 3 continuous probability
distributions?
✔✔0 - ✔✔if [a,b] denotes an arbitrary interval of numbers on the real number line, find
the probability when P(x=a)
✔✔means - ✔✔the central limit theorem states that as the sample size increases, the
distribution of the sample ________ approaches the normal distribution
✔✔increases, decreases - ✔✔as the sample size ________, the variation of the
sampling distribution of the mean ________
✔✔np is greater than or equal to 5 and n(1-p) is greater than or equal to 5 - ✔✔the
population of all sample proportions has a normal distribution if the sample size (n) is
sufficiently large. the rule of thumb for ensuring that n is sufficiently large is...
✔✔increases, normal - ✔✔for non-normal populations, as the sample size (n)
________, the distribution of sample means approaches a ________ distribution
✔✔convenience sampling - ✔✔a restaurant leaves comment cards on all of its tables
and encourages customers to participate in a brief survey to learn about their overall
experience. this is an example of what type of sampling?
✔✔convenience sampling - ✔✔a quality control worker at a factory selects the first 10
items she sees as her sample for the day. this is an example of what kind of sampling?
, ✔✔finite population (you count how many) - ✔✔a population that consists of all the
customers that will use the drive-thru of the local fast food restaurant is what type of
population?
✔✔convenience sampling - ✔✔what kind of sampling consists of selecting elements
because they are easy to sample?
✔✔graphical description analytics - ✔✔what type of analytics uses traditional or newer
graphs to present visual summaries of business information?
✔✔linear regression, decision trees, and neural networks - ✔✔what are 3 supervised
learning techniques in predictive analytics?
✔✔strata - ✔✔what are non-overlapping groups of similar elements in a population
called?
✔✔ordinal - ✔✔an identification of police officers by rank would represent an ________
level of measurement
✔✔simple random sample - ✔✔you want to select a sample of 100 employees from
company X. you assign a number to every employee in the company database from 1 to
100. and use a random number generator to select 100 numbers. this is an example of
what type of sample?
✔✔systematic sampling - ✔✔all employees of a company are listed in alphabetical
order. from the first 10 numbers, you randomly select a starting point of number 6. from
number 6 onwards, every 10th person on the list is selected (6, 16, 26, etc.) and you
end up with a sample of 100 people. this is an example of what type of sampling?
✔✔stratified sampling - ✔✔a company has 800 female employees and 200 male
employees. you want to ensure that the sample reflects the gender balance of the
company, so you sort the population into 2 strata based on gender. then you use
random sampling on each group, selecting 80 women and 20 men, which gives you a
representative sample of 100 people. this is an example of what type of sampling?
✔✔dashboard - ✔✔what is a graphical representation of the current status and
historical trends of a business's key performance indicators?
✔✔bullet graph - ✔✔as a business owner, I have requested my staff to develop a set of
dashboards that can be used by the public to show wait time at each of my 4 local
coffee shops at peak times during the day and whether the time is short, medium, or
long. what type of graphical display would be the best choice?
✔✔ogive - ✔✔graph of a cumulative distribution
