MATH 225N Statistics Final Exam - Chamberlain College of Nursing
the number of goals scored in a hockey game discrete
A scientist was studying the effects of a new fertilizer on experiment
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.
Identify the type of sampling used. cluster
A travel industry researcher interviews all of the
passengers on five randomly selected cruises. What
sampling technique is used?
Identify the type of sampling used. simple random
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?
Determine what type of observational study is described. cross-sectional; Information is collected at a specific point in time.
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.
Identify the type of sampling used. stratified
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?
Determine what type of observational study is described. cross-sectional; Information is collected at a specific point in time.
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.
Provide an appropriate response. closed question
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?
, MATH 225N Statistics Final Exam - Chamberlain College of Nursing
Classify the variable as qualitative or quantitative. quantitative
the number of calls received at a company's help desk
Provide an appropriate response. 227
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.
Provide an appropriate response. Together Fund
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?
Provide an appropriate response. range
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?
Provide an appropriate response. 7.5
Given the following five-number summary, find the IQR.
2.9, 5.7, 10.0, 13.2, 21.1.
Which measure of central tendency may not exist for all mode
numeric data sets?
Provide an appropriate response. About 91% of the total variation in the sample of y-values can be explained by (or
attributed to) the linear relationship between shear strength and precompression
Civil engineers often use the straight-line equation, E(y) stress.
= β0 + β1x, to model the relationship between the mean
shear strength E(y) of masonry joints and
precompression stress, x. To test this theory, a series of
stress tests were performed on solid bricks arranged in
triplets and joined with mortar. The precompression
stress was varied for each triplet and the ultimate shear
load just before failure (called the shear strength) was
recorded. The stress results for n = 7 triplet tests is
shown in the accompanying table followed by a SAS
printout of the regression analysis.
For this data set, R2 = .9052.
Give a practical interpretation of R2, the coefficient of
determination for the least squares model. Express R2 to
the nearest whole percent.
A traffic officer is compiling information about the There is a weak positive linear correlation.
relationship between the hour or the day and the speed
over the limit at which the motorist is ticketed. He
computes a correlation coefficient of 0.12. What does
this tell the officer?
If the coefficient of determination is close to 1, then the least squares regression line equation explains most of the variation in the
response variable.
A variable that is related to either the response variable lurking variable
or the predictor variable or both, but which is excluded
from the analysis is a
the number of goals scored in a hockey game discrete
A scientist was studying the effects of a new fertilizer on experiment
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.
Identify the type of sampling used. cluster
A travel industry researcher interviews all of the
passengers on five randomly selected cruises. What
sampling technique is used?
Identify the type of sampling used. simple random
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?
Determine what type of observational study is described. cross-sectional; Information is collected at a specific point in time.
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.
Identify the type of sampling used. stratified
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?
Determine what type of observational study is described. cross-sectional; Information is collected at a specific point in time.
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.
Provide an appropriate response. closed question
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?
, MATH 225N Statistics Final Exam - Chamberlain College of Nursing
Classify the variable as qualitative or quantitative. quantitative
the number of calls received at a company's help desk
Provide an appropriate response. 227
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.
Provide an appropriate response. Together Fund
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?
Provide an appropriate response. range
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?
Provide an appropriate response. 7.5
Given the following five-number summary, find the IQR.
2.9, 5.7, 10.0, 13.2, 21.1.
Which measure of central tendency may not exist for all mode
numeric data sets?
Provide an appropriate response. About 91% of the total variation in the sample of y-values can be explained by (or
attributed to) the linear relationship between shear strength and precompression
Civil engineers often use the straight-line equation, E(y) stress.
= β0 + β1x, to model the relationship between the mean
shear strength E(y) of masonry joints and
precompression stress, x. To test this theory, a series of
stress tests were performed on solid bricks arranged in
triplets and joined with mortar. The precompression
stress was varied for each triplet and the ultimate shear
load just before failure (called the shear strength) was
recorded. The stress results for n = 7 triplet tests is
shown in the accompanying table followed by a SAS
printout of the regression analysis.
For this data set, R2 = .9052.
Give a practical interpretation of R2, the coefficient of
determination for the least squares model. Express R2 to
the nearest whole percent.
A traffic officer is compiling information about the There is a weak positive linear correlation.
relationship between the hour or the day and the speed
over the limit at which the motorist is ticketed. He
computes a correlation coefficient of 0.12. What does
this tell the officer?
If the coefficient of determination is close to 1, then the least squares regression line equation explains most of the variation in the
response variable.
A variable that is related to either the response variable lurking variable
or the predictor variable or both, but which is excluded
from the analysis is a
