MATH 11: STATISTICS QUESTIONS WITH
ANSWERS PROVIDED. 2024/2025 UPDATE.
1. Determine whether the source given below has the potential
to create a bias in a statistical study
A certain medical organization tends to oppose the use of
meat and dairy products in our diets, and that organization
has received hundreds of thousands of dollars in funding from
an animal rights foundation.: There does appear to be a
potential to create a bias. There is an incentive to produce
results that are in line with the organization's creed and that
of its funders.
2. Determine whether the sampling method described below
appears to be sound or is flawed.
In a survey of 696 human resource professionals, each was
asked about the importance of the age of a job applicant. The
survey subjects were randomly selected by pollsters from a
reputable market research firm.: It appears to be sound
because the data are not biased in any way.
3. Determine whether the results below appear to have
statistical significance, and also determine whether the
results have practical significance.
In a study of a weight loss program, 4 subjects lost an average of
43 lbs. It is found that there is about a 38 % chance of getting
such results with a diet that has no effect.
Does the weight loss program have practical significance? No, the
program is not statistically significant because the results are likely to
occur by chance.
1/9
, MATH 11: STATISTICS QUESTIONS WITH
ANSWERS PROVIDED. 2024/2025 UPDATE.
Yes, the program is practically significant because the amount of
lost weight is large enough to be considered practically significant.
4. Determine whether the results appear to have statistical
significance, and also determine whether the results appear
to have practical significance.
In a study of a gender selection method used to increase the
likelihood of a baby being born a girl, 1921 users of the method
gave birth to 940 boys and 981 girls. There is about an 18 % chance
of getting that many girls if the method had no effect.: Because
there is an 18 % chance of getting that many girls by chance, the
method does not have statistical significance. Not many couples
would likely use a procedure that raises the likelihood of a girl from
the approximately 50% rate expected by chance to the
51 % produced by this method. So, this
method does not have practical
significance.
5. In the data table below, the x-values are the weights (in
pounds) of cars and the, y-values are the corresponding highway
fuel consumption amounts (in milgal).
Weight (1b)
4073
3330
4144
3680
3571
Highway Fuel Consumption (milgal)
26
32
2/9
ANSWERS PROVIDED. 2024/2025 UPDATE.
1. Determine whether the source given below has the potential
to create a bias in a statistical study
A certain medical organization tends to oppose the use of
meat and dairy products in our diets, and that organization
has received hundreds of thousands of dollars in funding from
an animal rights foundation.: There does appear to be a
potential to create a bias. There is an incentive to produce
results that are in line with the organization's creed and that
of its funders.
2. Determine whether the sampling method described below
appears to be sound or is flawed.
In a survey of 696 human resource professionals, each was
asked about the importance of the age of a job applicant. The
survey subjects were randomly selected by pollsters from a
reputable market research firm.: It appears to be sound
because the data are not biased in any way.
3. Determine whether the results below appear to have
statistical significance, and also determine whether the
results have practical significance.
In a study of a weight loss program, 4 subjects lost an average of
43 lbs. It is found that there is about a 38 % chance of getting
such results with a diet that has no effect.
Does the weight loss program have practical significance? No, the
program is not statistically significant because the results are likely to
occur by chance.
1/9
, MATH 11: STATISTICS QUESTIONS WITH
ANSWERS PROVIDED. 2024/2025 UPDATE.
Yes, the program is practically significant because the amount of
lost weight is large enough to be considered practically significant.
4. Determine whether the results appear to have statistical
significance, and also determine whether the results appear
to have practical significance.
In a study of a gender selection method used to increase the
likelihood of a baby being born a girl, 1921 users of the method
gave birth to 940 boys and 981 girls. There is about an 18 % chance
of getting that many girls if the method had no effect.: Because
there is an 18 % chance of getting that many girls by chance, the
method does not have statistical significance. Not many couples
would likely use a procedure that raises the likelihood of a girl from
the approximately 50% rate expected by chance to the
51 % produced by this method. So, this
method does not have practical
significance.
5. In the data table below, the x-values are the weights (in
pounds) of cars and the, y-values are the corresponding highway
fuel consumption amounts (in milgal).
Weight (1b)
4073
3330
4144
3680
3571
Highway Fuel Consumption (milgal)
26
32
2/9
