STT 231 EXAM 2 ACTUAL TEST PAPER 2026
QUESTIONS WITH SOLUTIONS GRADED A+
COMPLETE ANSWERS BUNDLE
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
How old, on average, is a chicken egg in this farm?
i. z-interval for a proportion, 𝜋
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝝁
iv. t-test for a mean, 𝜇. A
nswer: iii. t-interval for a mean, 𝝁
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
Do 75% of chicken eggs in this farm contain less than 230 milligrams of
cholesterol?
,i. z-interval for a proportion, 𝜋
ii. z-test for a proportion, 𝝅
iii. t-interval for a mean, 𝜇
iv. t-test for a mean, 𝜇. A
nswer: ii. z-test for a proportion, 𝝅
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
What percentage of chicken eggs in this farm contain fewer than
235milligrams of cholesterol?
i. z-interval for a proportion, 𝝅
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝜇
iv. t-test for a mean, 𝜇. A
nswer: i. z-interval for a proportion, 𝝅
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
, How much cholesterol, on average, is contained in a chicken egg
fromthis farm?
i. z-interval for a proportion, 𝜋
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝝁
iv. t-test for a mean, 𝜇. A
nswer: iii. t-interval for a mean, 𝝁
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
What percentage of chicken eggs in this farm have been tested at
leastonce in the past 10 days?
i. z-interval for a proportion, 𝝅
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝜇
iv. t-test for a mean, 𝜇. A
nswer: i. z-interval for a proportion, 𝝅
●● ____________ draws a conclusion (i.e., infers something) about a
population based on a sample statistic.
QUESTIONS WITH SOLUTIONS GRADED A+
COMPLETE ANSWERS BUNDLE
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
How old, on average, is a chicken egg in this farm?
i. z-interval for a proportion, 𝜋
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝝁
iv. t-test for a mean, 𝜇. A
nswer: iii. t-interval for a mean, 𝝁
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
Do 75% of chicken eggs in this farm contain less than 230 milligrams of
cholesterol?
,i. z-interval for a proportion, 𝜋
ii. z-test for a proportion, 𝝅
iii. t-interval for a mean, 𝜇
iv. t-test for a mean, 𝜇. A
nswer: ii. z-test for a proportion, 𝝅
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
What percentage of chicken eggs in this farm contain fewer than
235milligrams of cholesterol?
i. z-interval for a proportion, 𝝅
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝜇
iv. t-test for a mean, 𝜇. A
nswer: i. z-interval for a proportion, 𝝅
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
, How much cholesterol, on average, is contained in a chicken egg
fromthis farm?
i. z-interval for a proportion, 𝜋
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝝁
iv. t-test for a mean, 𝜇. A
nswer: iii. t-interval for a mean, 𝝁
●● Suppose a laboratory tested the amount (in milligrams) of cholesterol
per egg ina random sample of 30 chicken eggs in a poultry farm. For
each of the following questions, indicate the appropriate inference
procedure
What percentage of chicken eggs in this farm have been tested at
leastonce in the past 10 days?
i. z-interval for a proportion, 𝝅
ii. z-test for a proportion, 𝜋
iii. t-interval for a mean, 𝜇
iv. t-test for a mean, 𝜇. A
nswer: i. z-interval for a proportion, 𝝅
●● ____________ draws a conclusion (i.e., infers something) about a
population based on a sample statistic.
