MATH 225N STATISTICS WEEK FOUR
CONTINGENCY TABLES COMPREHENSIVE
TEST PAPER 2026 FULL QUESTIONS AND
VERIFIED SOLUTIONS GRADED A+
⩥ A scientist was studying the effects of a new fertilizer on crop yield.
She randomly assigned half of the plots on a farm to group one and the
remaining plots to group two. On the plots in group one, the new
fertilizer was used for a year. On the plots in group two, the old fertilizer
was used. At the end of the year the average crop yield for the plots in
group one was compared with the average crop yield for the plots in
group two..
Answer: experiment
⩥ Identify the type of sampling used.
A travel industry researcher interviews all of the passengers on five
randomly selected cruises. What sampling technique is used?.
Answer: cluster
⩥ Identify the type of sampling used.
A lobbyist for the oil industry assigns a number to each senator and then
uses a computer to randomly generate ten numbers. The lobbyist
,contacts the senators corresponding to these numbers. What sampling
technique was used?.
Answer: simple random
⩥ Determine what type of observational study is described. Explain.
Researchers wanted to determine whether there was an association
between high blood pressure and the suppression of emotions. The
researchers looked at 1800 adults enrolled in a Health Initiative
Observational Study. Each person was interviewed and asked about their
response to emotions. In particular they were asked whether their
tendency was to express or to hold in anger and other emotions. The
degree of suppression of emotions was rated on a scale of 1 to 10. Each
person's blood pressure was also measured. The researchers analyzed the
results to determine whether there was an association between high
blood pressure and the suppression of emotions..
Answer: cross-sectional; Information is collected at a specific point in
time.
⩥ Identify the type of sampling used.
Thirty-five math majors, 47 music majors and 51 history majors are
randomly selected from 376 math majors, 591 music majors and 267
history majors at the state university. What sampling technique is used?.
Answer: stratified
,⩥ Determine what type of observational study is described. Explain.
Researchers wanted to determine whether there was an association
between high blood pressure and the suppression of emotions. The
researchers looked at 1800 adults enrolled in a Health Initiative
Observational Study. Each person was interviewed and asked about their
response to emotions. In particular they were asked whether their
tendency was to express or to hold in anger and other emotions. The
degree of suppression of emotions was rated on a scale of 1 to 10. Each
person's blood pressure was also measured. The researchers analyzed the
results to determine whether there was an association between high
blood pressure and the suppression of emotions..
Answer: cross-sectional; Information is collected at a specific point in
time.
⩥ Provide an appropriate response.
Multiple choice questions on a test that include as one of the choices
"none of the above" are an example of what type of question?.
Answer: closed question
⩥ Classify the variable as qualitative or quantitative.
the number of calls received at a company's help desk.
, Answer: quantitative
⩥ Provide an appropriate response.
The following data are the yields, in bushels, of hay from a farmer's last
10 years:
375, 210, 150, 147, 429, 189, 320, 580, 407, 180.
Find the IQR..
Answer: 227
⩥ Provide an appropriate response.
Over the last 10 years four mutual funds all had the same mean rate of
return, 12%. These mutual funds had different standard deviations as
follows: Mutual Money 8%, Co-joined Investments 6%, Together Fund
4%, All for One Fund 9%. Which mutual fund investment is the most
consistent in rate of return?.
Answer: Together Fund
⩥ Provide an appropriate response.
Last year batting averages in professional baseball averaged 0.256 with a
high of and a low of (minimum 250 at-bats). Based on this information,
which measure of variation could be calculated?.
CONTINGENCY TABLES COMPREHENSIVE
TEST PAPER 2026 FULL QUESTIONS AND
VERIFIED SOLUTIONS GRADED A+
⩥ A scientist was studying the effects of a new fertilizer on crop yield.
She randomly assigned half of the plots on a farm to group one and the
remaining plots to group two. On the plots in group one, the new
fertilizer was used for a year. On the plots in group two, the old fertilizer
was used. At the end of the year the average crop yield for the plots in
group one was compared with the average crop yield for the plots in
group two..
Answer: experiment
⩥ Identify the type of sampling used.
A travel industry researcher interviews all of the passengers on five
randomly selected cruises. What sampling technique is used?.
Answer: cluster
⩥ Identify the type of sampling used.
A lobbyist for the oil industry assigns a number to each senator and then
uses a computer to randomly generate ten numbers. The lobbyist
,contacts the senators corresponding to these numbers. What sampling
technique was used?.
Answer: simple random
⩥ Determine what type of observational study is described. Explain.
Researchers wanted to determine whether there was an association
between high blood pressure and the suppression of emotions. The
researchers looked at 1800 adults enrolled in a Health Initiative
Observational Study. Each person was interviewed and asked about their
response to emotions. In particular they were asked whether their
tendency was to express or to hold in anger and other emotions. The
degree of suppression of emotions was rated on a scale of 1 to 10. Each
person's blood pressure was also measured. The researchers analyzed the
results to determine whether there was an association between high
blood pressure and the suppression of emotions..
Answer: cross-sectional; Information is collected at a specific point in
time.
⩥ Identify the type of sampling used.
Thirty-five math majors, 47 music majors and 51 history majors are
randomly selected from 376 math majors, 591 music majors and 267
history majors at the state university. What sampling technique is used?.
Answer: stratified
,⩥ Determine what type of observational study is described. Explain.
Researchers wanted to determine whether there was an association
between high blood pressure and the suppression of emotions. The
researchers looked at 1800 adults enrolled in a Health Initiative
Observational Study. Each person was interviewed and asked about their
response to emotions. In particular they were asked whether their
tendency was to express or to hold in anger and other emotions. The
degree of suppression of emotions was rated on a scale of 1 to 10. Each
person's blood pressure was also measured. The researchers analyzed the
results to determine whether there was an association between high
blood pressure and the suppression of emotions..
Answer: cross-sectional; Information is collected at a specific point in
time.
⩥ Provide an appropriate response.
Multiple choice questions on a test that include as one of the choices
"none of the above" are an example of what type of question?.
Answer: closed question
⩥ Classify the variable as qualitative or quantitative.
the number of calls received at a company's help desk.
, Answer: quantitative
⩥ Provide an appropriate response.
The following data are the yields, in bushels, of hay from a farmer's last
10 years:
375, 210, 150, 147, 429, 189, 320, 580, 407, 180.
Find the IQR..
Answer: 227
⩥ Provide an appropriate response.
Over the last 10 years four mutual funds all had the same mean rate of
return, 12%. These mutual funds had different standard deviations as
follows: Mutual Money 8%, Co-joined Investments 6%, Together Fund
4%, All for One Fund 9%. Which mutual fund investment is the most
consistent in rate of return?.
Answer: Together Fund
⩥ Provide an appropriate response.
Last year batting averages in professional baseball averaged 0.256 with a
high of and a low of (minimum 250 at-bats). Based on this information,
which measure of variation could be calculated?.
