MATH 225N Statistics Final EXAM – Chamberlain
College of Nursing MATH 225N Statistics Final EXAM
2026-2027 LATEST VERSION QUESTIONS AND
VERIFIED CORRECT ANSWERS JUST RELEASED
A recent study attempted to estimate the proportion of Florida residents who were willing
to spend more tax dollars on protecting the Florida beaches from environmental
disasters. Thirty-two hundred Florida residents were surveyed. Which of the following is
the population used in the study? - answer>>>all Florida residents
Find the area under the standard normal curve to the left of z = 1.25. - answer>>>0.8944
In a sample of 10 randomly selected employees, it was found that their mean height was
63.4 inches. From previous studies, it is assumed that the standard deviation, σ, is 2.4.
Compute the 95% confidence interval for μ. - answer>>>(61.9, 64.9)
Identify the type of sampling used.
A writer for an art magazine randomly selects and interviews fifty male and fifty female
artists. What sampling technique is used? - answer>>>stratified
Provide an appropriate response.
The percentage of measurements that are above the 63rd percentile is - answer>>>37%
Provide an appropriate response.
The cell phone conversations of a random sample of 120 students has a standard
deviation of 9.7 minutes. Find the margin of error, E, using a 98% confidence interval. -
answer>>>2.06
, -
Provide an appropriate response.
Investing is a game of chance. Suppose there is a 38% chance that a risky stock investment
will end up in a total loss of your investment. Because the rewards are so high, you decide
to invest in four independent risky stocks. Find the probability that at least one of your
four investments becomes a total loss. Round to the nearest ten-thousandth when
necessary. - answer>>>0.8522
Provide an appropriate response.
A pediatrician wants to determine the relation that exists between a child's height, x, and
head circumfrence, y. She randomly selects 11 children from her practice, measures their
heights and head circumfrences in inches, and performs linear regression analysis on the
data and obtains the following regression line:
y = 0.1827x +12.4932
Interpret the slope of the line. - answer>>>For every 1-inch increase in height, we expect
the child's head circumfrence to increse by 0.1827 inches.
Provide an appropriate response.
The peak shopping time at a pet store is between 8-11:00 am on Saturday mornings.
Management at the pet store randomly selected 185 customers last Saturday morning
and decided to observe their shopping habits. They recorded the number of items that a
sample of the customers purchased as well as the total time the customers spent in the
store. Identify the types of variables recorded by the pet store. - answer>>>number of
items - discrete; total time - continuous
A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver
pizzas. The owner of the store has determined that home delivery will be successful if the
, average time spent on the deliveries does not exceed 40 minutes. The owner has
randomly selected 22 customers and has delivered pizzas to their homes in order to test if
the mean delivery time actually exceeds 40 minutes. Suppose the P-value for the test was
found to be 0.0281. State the correct conclusion. - answer>>>At α = 0.025, we fail to
reject H0.
The tread life of a particular brand of tire is a random variable best described by a normal
distribution with a mean of 60,000 miles and a standard deviation of 2900 miles. What is
the probability a particular tire of this brand will last longer than 57,100 miles? -
answer>>>0.8413
A physical fitness association is including the mile run in its secondary-school fitness test.
The time for this event for boys in secondary school is known to possess a normal
distribution with a mean of 450 seconds and a standard deviation of 60 seconds. Find the
probability that a randomly selected boy in secondary school can run the mile in less than
312 seconds. - answer>>>0.0107
Identify the type of sampling used.
Every fifth adult entering an airport is checked for extra security screening. What sampling
technique is used? - answer>>>systematic
Identify the type of sampling used.
At a local technical school, five auto repair classes are randomly selected and all of the
students from each class are interviewed. What sampling technique is used? -
answer>>>cluster
Determine the level of measurement of the variable.
the year of manufacture of a car - answer>>>interval
College of Nursing MATH 225N Statistics Final EXAM
2026-2027 LATEST VERSION QUESTIONS AND
VERIFIED CORRECT ANSWERS JUST RELEASED
A recent study attempted to estimate the proportion of Florida residents who were willing
to spend more tax dollars on protecting the Florida beaches from environmental
disasters. Thirty-two hundred Florida residents were surveyed. Which of the following is
the population used in the study? - answer>>>all Florida residents
Find the area under the standard normal curve to the left of z = 1.25. - answer>>>0.8944
In a sample of 10 randomly selected employees, it was found that their mean height was
63.4 inches. From previous studies, it is assumed that the standard deviation, σ, is 2.4.
Compute the 95% confidence interval for μ. - answer>>>(61.9, 64.9)
Identify the type of sampling used.
A writer for an art magazine randomly selects and interviews fifty male and fifty female
artists. What sampling technique is used? - answer>>>stratified
Provide an appropriate response.
The percentage of measurements that are above the 63rd percentile is - answer>>>37%
Provide an appropriate response.
The cell phone conversations of a random sample of 120 students has a standard
deviation of 9.7 minutes. Find the margin of error, E, using a 98% confidence interval. -
answer>>>2.06
, -
Provide an appropriate response.
Investing is a game of chance. Suppose there is a 38% chance that a risky stock investment
will end up in a total loss of your investment. Because the rewards are so high, you decide
to invest in four independent risky stocks. Find the probability that at least one of your
four investments becomes a total loss. Round to the nearest ten-thousandth when
necessary. - answer>>>0.8522
Provide an appropriate response.
A pediatrician wants to determine the relation that exists between a child's height, x, and
head circumfrence, y. She randomly selects 11 children from her practice, measures their
heights and head circumfrences in inches, and performs linear regression analysis on the
data and obtains the following regression line:
y = 0.1827x +12.4932
Interpret the slope of the line. - answer>>>For every 1-inch increase in height, we expect
the child's head circumfrence to increse by 0.1827 inches.
Provide an appropriate response.
The peak shopping time at a pet store is between 8-11:00 am on Saturday mornings.
Management at the pet store randomly selected 185 customers last Saturday morning
and decided to observe their shopping habits. They recorded the number of items that a
sample of the customers purchased as well as the total time the customers spent in the
store. Identify the types of variables recorded by the pet store. - answer>>>number of
items - discrete; total time - continuous
A local eat-in pizza restaurant wants to investigate the possibility of starting to deliver
pizzas. The owner of the store has determined that home delivery will be successful if the
, average time spent on the deliveries does not exceed 40 minutes. The owner has
randomly selected 22 customers and has delivered pizzas to their homes in order to test if
the mean delivery time actually exceeds 40 minutes. Suppose the P-value for the test was
found to be 0.0281. State the correct conclusion. - answer>>>At α = 0.025, we fail to
reject H0.
The tread life of a particular brand of tire is a random variable best described by a normal
distribution with a mean of 60,000 miles and a standard deviation of 2900 miles. What is
the probability a particular tire of this brand will last longer than 57,100 miles? -
answer>>>0.8413
A physical fitness association is including the mile run in its secondary-school fitness test.
The time for this event for boys in secondary school is known to possess a normal
distribution with a mean of 450 seconds and a standard deviation of 60 seconds. Find the
probability that a randomly selected boy in secondary school can run the mile in less than
312 seconds. - answer>>>0.0107
Identify the type of sampling used.
Every fifth adult entering an airport is checked for extra security screening. What sampling
technique is used? - answer>>>systematic
Identify the type of sampling used.
At a local technical school, five auto repair classes are randomly selected and all of the
students from each class are interviewed. What sampling technique is used? -
answer>>>cluster
Determine the level of measurement of the variable.
the year of manufacture of a car - answer>>>interval
