MATH 225N STATISTICS FINAL EXAM
CHAMBERLAIN COLLEGE OF NURSING
ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
⩥ Students in an Introductory Statistics class at BYU-Idaho were
studying prices of cold cereal at grocery stores in Rexburg. To get a
sample of cold cereal prices, they went to Albertson's and rolled a die to
decide which box from the left of the top shelf they would start on. They
then recorded every 6th cereal after the first, moving from left to right
down the shelves, recording the name, size, and price of each cereal in
their sample. Is this study an experiment or an observational study, and
why? Answer: An observational study, because the students did not
impose any treatment on the cereals.
⩥ Daniel was doing a statistical study. In which step of the statistical
process is he engaged when he creates a histogram of his data and
calculates a sample mean? Answer: Describe the Data
⩥ In order to estimate the average weight of all adults in the state of
Idaho, you randomly select 50 adults from each county in Idaho. Use
this information for all the parts.
Part 1: What type of sampling method was done here? Answer: Stratified
Sample
,⩥ In order to estimate the average weight of all adults in the state of
Idaho, you randomly select 50 adults from each county in Idaho. Use
this information for all the parts.
Part 2: What is the population in your study above? Answer: The
weights of all adults in the state of Idaho.
⩥ You would like to test if females like math more than males do. You
collect a sample of 100 males and 57 females. Among the 100 males, 32
say they like math. Among the females, 21 say they like math. Use this
information for all the parts.
Part 1: What is the null and alternative hypothesis? Answer: H0: P
male=P female
HA: P male<P female
⩥ You would like to test if females like math more than males do. You
collect a sample of 100 males and 57 females. Among the 100 males, 32
say they like math. Among the females, 21 say they like math. Use this
information for all the parts.
What is the p-value for your test? Answer: .269
⩥ You would like to test if females like math more than males do. You
collect a sample of 100 males and 57 females. Among the 100 males, 32
say they like math. Among the females, 21 say they like math. Use this
information for all the parts.
Part 3: Are the requirements for the above test satisfied? Answer: Yes,
both and are larger than 10 for both groups.
, ⩥ Tanker trucks are designed to carry huge quantities of gasoline from
refineries to filling stations. A factory that manufactures the tank of the
trucks claims to manufacture tanks with a capacity of 8550 gallons of
gasoline. The actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 1: What is the probability that a randomly chosen truck will have a
capacity greater than 8528 gallons? Answer: .908
⩥ Tanker trucks are designed to carry huge quantities of gasoline from
refineries to filling stations. A factory that manufactures the tank of the
trucks claims to manufacture tanks with a capacity of 8550 gallons of
gasoline. The actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 2: Suppose that a simple random sample of tanks is selected and the
sample mean capacity is found to be 8550 gallons. What is the z-score
corresponding to this sample mean? Answer: 2.336
⩥ Tanker trucks are designed to carry huge quantities of gasoline from
refineries to filling stations. A factory that manufactures the tank of the
trucks claims to manufacture tanks with a capacity of 8550 gallons of
gasoline. The actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 3: What is the probability that a sample of size 20 will have a mean
between 8538 and 8550 gallons? Answer: .975
CHAMBERLAIN COLLEGE OF NURSING
ACTUAL EXAM PAPER 2026 QUESTIONS
WITH ANSWERS GRADED A+
⩥ Students in an Introductory Statistics class at BYU-Idaho were
studying prices of cold cereal at grocery stores in Rexburg. To get a
sample of cold cereal prices, they went to Albertson's and rolled a die to
decide which box from the left of the top shelf they would start on. They
then recorded every 6th cereal after the first, moving from left to right
down the shelves, recording the name, size, and price of each cereal in
their sample. Is this study an experiment or an observational study, and
why? Answer: An observational study, because the students did not
impose any treatment on the cereals.
⩥ Daniel was doing a statistical study. In which step of the statistical
process is he engaged when he creates a histogram of his data and
calculates a sample mean? Answer: Describe the Data
⩥ In order to estimate the average weight of all adults in the state of
Idaho, you randomly select 50 adults from each county in Idaho. Use
this information for all the parts.
Part 1: What type of sampling method was done here? Answer: Stratified
Sample
,⩥ In order to estimate the average weight of all adults in the state of
Idaho, you randomly select 50 adults from each county in Idaho. Use
this information for all the parts.
Part 2: What is the population in your study above? Answer: The
weights of all adults in the state of Idaho.
⩥ You would like to test if females like math more than males do. You
collect a sample of 100 males and 57 females. Among the 100 males, 32
say they like math. Among the females, 21 say they like math. Use this
information for all the parts.
Part 1: What is the null and alternative hypothesis? Answer: H0: P
male=P female
HA: P male<P female
⩥ You would like to test if females like math more than males do. You
collect a sample of 100 males and 57 females. Among the 100 males, 32
say they like math. Among the females, 21 say they like math. Use this
information for all the parts.
What is the p-value for your test? Answer: .269
⩥ You would like to test if females like math more than males do. You
collect a sample of 100 males and 57 females. Among the 100 males, 32
say they like math. Among the females, 21 say they like math. Use this
information for all the parts.
Part 3: Are the requirements for the above test satisfied? Answer: Yes,
both and are larger than 10 for both groups.
, ⩥ Tanker trucks are designed to carry huge quantities of gasoline from
refineries to filling stations. A factory that manufactures the tank of the
trucks claims to manufacture tanks with a capacity of 8550 gallons of
gasoline. The actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 1: What is the probability that a randomly chosen truck will have a
capacity greater than 8528 gallons? Answer: .908
⩥ Tanker trucks are designed to carry huge quantities of gasoline from
refineries to filling stations. A factory that manufactures the tank of the
trucks claims to manufacture tanks with a capacity of 8550 gallons of
gasoline. The actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 2: Suppose that a simple random sample of tanks is selected and the
sample mean capacity is found to be 8550 gallons. What is the z-score
corresponding to this sample mean? Answer: 2.336
⩥ Tanker trucks are designed to carry huge quantities of gasoline from
refineries to filling stations. A factory that manufactures the tank of the
trucks claims to manufacture tanks with a capacity of 8550 gallons of
gasoline. The actual capacity of the tanks is normally distributed with
mean gallons and standard deviation gallons.
Part 3: What is the probability that a sample of size 20 will have a mean
between 8538 and 8550 gallons? Answer: .975
