MATH 1280 Statistics Final (All Chapters) - Questions
And Accurate Answers
Sixty adults with gum disease were asked the number of times per week they
used to floss before their diagnoses. The (incomplete) results are shown
below:
#FlossingperWeek Freq RelativeFreq CumulativeRelativeFreq
0 27 0.4500
1 18
3 0.9333
6 3 0.0500
7 1 0.0167 Correct Answer - Since there was a total of 60 adults in the
study and 45 flossed at most 1 time per week, we have
45/60 x 100% = 75%
Determine if the following is an example of descriptive or inferential statistics.
300 female Osprey hatch-lings were tracked until they died or succeeded in
laying their own eggs. Based on the data, the researchers concluded that
somewhere between 12% and 18% of all female Osprey hatch-lings in the US
succeed in growing up to lay their own eggs. Correct Answer - Inferential
Statistics
Nice work, inferential statistics is about making conclusions about the
population based on the sample.
Fifty part-time students were asked how many courses they were taking this
term. The (incomplete) results are shown below:
#ofCourses Freq RelativeFreq CumulativeRelative Freq
1 30 0.6
2 15
3
What percent of students take exactly two courses? (Be sure to write your
answer as a percent and not a proportion) Correct Answer - Since there
are a total of 50 Students and 15 are taking 2 courses,15/50 x 100% = 30%.
Fifty part-time students were asked how many courses they were taking this
term. The (incomplete) results are shown below:
#ofCourses Freq RelativeFreq CumulativeRelativeFreq
,1 30 0.6
2 15
3
Find the relative frequency for students taking 3 courses. Correct Answer -
Since there are a total of 50 Students and 45 are taking 1 or 2 courses, there
are 5 left to take 3 courses.5/50 = 0.1
Sixty adults with gum disease were asked the number of times per week they
used to floss before their diagnoses. The (incomplete) results are shown
below:
FlossingperWeek Freq RelativeFreq CumulativeRelativeFreq
0 27 0.4500
1 18
3 0.9333
6 3 0.0500
7 1 0.0167 Correct Answer - 75 (with margin: 0)
Since there was a total of 60 adults in the study and 45 flossed at most 1 time
per week, we have
45/60 x 100% = 75%
A political action committee is interested in the proportion of all registered
voters who will vote "Yes" on a measure to expand the use of solar energy.
Match the vocabulary word with its corresponding example. Correct
Answer - All registered voters in the US: Population
The 1000 registered voters who participated in the study: Sample
The proportion of registered voters who will vote "Yes" on the measure:
Parameter
The proportion of the 1000 registered voters that were surveyed who will
vote "Yes" on the measure: Statistic
"Yes" or "No" for each registered voter:Variable
The list of "Yes" and "No" answers that were given by the 1000 participants in
the study: Data
, A sheriff is interested in the average speed that people drive on Highway 50.
Match the vocabulary word with its corresponding example. Correct
Answer - All people who drive on Highway 50:
Population
The 250 randomly selected drivers who were on Highway 50: Sample
The average speed that all drivers go on Highway 50: Parameter
The average speed that the 250 randomly selected drivers drove on Highway
50: Statistic
The speed that a driver drives on Highway 50: Variable
The list of the 250 speeds that the drivers studied drove: Data
A marriage counselor is interested in the proportion the clients she counsels
that stay married. Match the vocabulary word with its corresponding example.
Correct Answer - All of the counselor's clients:
Population
The 55 randomly selected clients that were chosen for this study: Sample
The proportion of all of the counselor's clients who stayed married:
Parameter
The proportion of the 55 randomly selected clients who stayed married:
Statistic
The answer "Yes" or "No" to the question on whether a client stayed married:
Variable
The list of "Yes" or "No" answers to the question on whether the clients stayed
married: Data
A fitness center is interested in the average amount of time a client exercises
in the center each week. Match the vocabulary word with its corresponding
example Correct Answer - All clients at the fitness center:
And Accurate Answers
Sixty adults with gum disease were asked the number of times per week they
used to floss before their diagnoses. The (incomplete) results are shown
below:
#FlossingperWeek Freq RelativeFreq CumulativeRelativeFreq
0 27 0.4500
1 18
3 0.9333
6 3 0.0500
7 1 0.0167 Correct Answer - Since there was a total of 60 adults in the
study and 45 flossed at most 1 time per week, we have
45/60 x 100% = 75%
Determine if the following is an example of descriptive or inferential statistics.
300 female Osprey hatch-lings were tracked until they died or succeeded in
laying their own eggs. Based on the data, the researchers concluded that
somewhere between 12% and 18% of all female Osprey hatch-lings in the US
succeed in growing up to lay their own eggs. Correct Answer - Inferential
Statistics
Nice work, inferential statistics is about making conclusions about the
population based on the sample.
Fifty part-time students were asked how many courses they were taking this
term. The (incomplete) results are shown below:
#ofCourses Freq RelativeFreq CumulativeRelative Freq
1 30 0.6
2 15
3
What percent of students take exactly two courses? (Be sure to write your
answer as a percent and not a proportion) Correct Answer - Since there
are a total of 50 Students and 15 are taking 2 courses,15/50 x 100% = 30%.
Fifty part-time students were asked how many courses they were taking this
term. The (incomplete) results are shown below:
#ofCourses Freq RelativeFreq CumulativeRelativeFreq
,1 30 0.6
2 15
3
Find the relative frequency for students taking 3 courses. Correct Answer -
Since there are a total of 50 Students and 45 are taking 1 or 2 courses, there
are 5 left to take 3 courses.5/50 = 0.1
Sixty adults with gum disease were asked the number of times per week they
used to floss before their diagnoses. The (incomplete) results are shown
below:
FlossingperWeek Freq RelativeFreq CumulativeRelativeFreq
0 27 0.4500
1 18
3 0.9333
6 3 0.0500
7 1 0.0167 Correct Answer - 75 (with margin: 0)
Since there was a total of 60 adults in the study and 45 flossed at most 1 time
per week, we have
45/60 x 100% = 75%
A political action committee is interested in the proportion of all registered
voters who will vote "Yes" on a measure to expand the use of solar energy.
Match the vocabulary word with its corresponding example. Correct
Answer - All registered voters in the US: Population
The 1000 registered voters who participated in the study: Sample
The proportion of registered voters who will vote "Yes" on the measure:
Parameter
The proportion of the 1000 registered voters that were surveyed who will
vote "Yes" on the measure: Statistic
"Yes" or "No" for each registered voter:Variable
The list of "Yes" and "No" answers that were given by the 1000 participants in
the study: Data
, A sheriff is interested in the average speed that people drive on Highway 50.
Match the vocabulary word with its corresponding example. Correct
Answer - All people who drive on Highway 50:
Population
The 250 randomly selected drivers who were on Highway 50: Sample
The average speed that all drivers go on Highway 50: Parameter
The average speed that the 250 randomly selected drivers drove on Highway
50: Statistic
The speed that a driver drives on Highway 50: Variable
The list of the 250 speeds that the drivers studied drove: Data
A marriage counselor is interested in the proportion the clients she counsels
that stay married. Match the vocabulary word with its corresponding example.
Correct Answer - All of the counselor's clients:
Population
The 55 randomly selected clients that were chosen for this study: Sample
The proportion of all of the counselor's clients who stayed married:
Parameter
The proportion of the 55 randomly selected clients who stayed married:
Statistic
The answer "Yes" or "No" to the question on whether a client stayed married:
Variable
The list of "Yes" or "No" answers to the question on whether the clients stayed
married: Data
A fitness center is interested in the average amount of time a client exercises
in the center each week. Match the vocabulary word with its corresponding
example Correct Answer - All clients at the fitness center:
