Stats Final Exam 80 Questions with Verified Answers
A study examined music performance anxiety. Scores on the Performance Anxiety
Inventory (PAI) scale for participants in eight different studies are reproduced in
the following table. Which of the following statements is true?
60, 48, 57, 45, 47, 49, 61, 46
A) Half of all music PAI scores are more than 51.6.
B) The average music PAI score is 49.
C) The average music PAI score is 51.6.
D) Half of all music PAI scores are more than 49. - CORRECT ANSWER C) The
average music PAI score is 51.6.
A large-scale study was conducted at all four-year degree Florida universities this
past year to analyze class attendance. Data was collected from a total of 5,000
students. Among the findings, researchers concluded that "Introductory
Statistics" was the most attended class and "Intermediate Sword Swallowing" was
the least attended. Identify the population of interest.
A) All college students in the United States
B) All Florida college students
C) All Florida college students at four-year institutions
D) 5,000 Florida college students at four-year institutions - CORRECT ANSWER C)
All Florida college students at four-year institutions
Assuming we have a mound-shaped and symmetric distribution. The distribution
has mean 30, standard deviation 5. Give an interval where you believe
approximately 95% of the data fell in the distribution?
A) Between 20 and 40
B) Less than 20
C) Greater than 40
D) Less than 20 and greater than 40 - CORRECT ANSWER A) Between 20 and 40
Which of the following is the single best description of the role of the z-score in
statistical methods?
A) The z-score is a measure of spread.
,B) The z-score is a measure of shape.
C) The z-score is a measure of center.
D) The z-score is a measure of position. - CORRECT ANSWER D) The z-score is a
measure of position.
The body weight of Cockapoos, a crossbreed of a Cocker Spaniel and a poodle,
follows a mound-shaped/symmetric distribution with a mean of 18.3 pounds and
a standard deviation of 2.2 pounds. What percentage of Cockapoos will have body
weight less than 16.1 pounds?
A) Approximately 84%
B) Approximately 95%
C) Approximately 16%
D) Approximately 34% - CORRECT ANSWER C) Approximately 16%
50 Super Bowl viewers were polled by a statistician to determine whether or not
they expected Jay-Z to make a guest appearance during the halftime
performance. What type of data was collected?
A) Qualitative
B) Quantitative
C) Simple Random
D) Systematic
E) Normal - CORRECT ANSWER A) Qualitative
Given the frequency table below, what is the relative
frequency of the data value 2?
Value Frequency
26
34
45
57
63
A) 0.6
B) 0.24
C) 24
D) 0.06 - CORRECT ANSWER B) 0.24
, A distribution have a mean = 40, median = 80. What type of distribution most
likely describes the shape of it?
A) Skewed to the right
B) Skewed to the left
C) unable to determine with the information given
D) symmetric - CORRECT ANSWER B) Skewed to the left
A public opinion poll in Florida wants to determine whether registered voters in
the state approve of legalizing marihuana. They randomly select 50 registered
voters from each county in the state and ask whether they approve or disapprove
of legalizing marihuana. Identify the experimental unit of interest to the pollster.
A) 50 registered voters from each county in the state that the data was collected
from
B) A single registered voter in Florida
C) Opinion on legalizing marihuana
D) All registered voters in Florida - CORRECT ANSWER B) A single registered voter
in Florida
Given the frequency table below, calculate the mean.
Value Frequency
26
34
45
57
63
A) 3.88
B) 4
C) 4.92
D) 5.13 - CORRECT ANSWER A) 3.88
Calculate the sample standard deviation of the following sample data
230, 436, 320, 400, 188
A) 106.35
B) 248
C) 11311.2
D) 314.2 - CORRECT ANSWER A) 106.35
A study examined music performance anxiety. Scores on the Performance Anxiety
Inventory (PAI) scale for participants in eight different studies are reproduced in
the following table. Which of the following statements is true?
60, 48, 57, 45, 47, 49, 61, 46
A) Half of all music PAI scores are more than 51.6.
B) The average music PAI score is 49.
C) The average music PAI score is 51.6.
D) Half of all music PAI scores are more than 49. - CORRECT ANSWER C) The
average music PAI score is 51.6.
A large-scale study was conducted at all four-year degree Florida universities this
past year to analyze class attendance. Data was collected from a total of 5,000
students. Among the findings, researchers concluded that "Introductory
Statistics" was the most attended class and "Intermediate Sword Swallowing" was
the least attended. Identify the population of interest.
A) All college students in the United States
B) All Florida college students
C) All Florida college students at four-year institutions
D) 5,000 Florida college students at four-year institutions - CORRECT ANSWER C)
All Florida college students at four-year institutions
Assuming we have a mound-shaped and symmetric distribution. The distribution
has mean 30, standard deviation 5. Give an interval where you believe
approximately 95% of the data fell in the distribution?
A) Between 20 and 40
B) Less than 20
C) Greater than 40
D) Less than 20 and greater than 40 - CORRECT ANSWER A) Between 20 and 40
Which of the following is the single best description of the role of the z-score in
statistical methods?
A) The z-score is a measure of spread.
,B) The z-score is a measure of shape.
C) The z-score is a measure of center.
D) The z-score is a measure of position. - CORRECT ANSWER D) The z-score is a
measure of position.
The body weight of Cockapoos, a crossbreed of a Cocker Spaniel and a poodle,
follows a mound-shaped/symmetric distribution with a mean of 18.3 pounds and
a standard deviation of 2.2 pounds. What percentage of Cockapoos will have body
weight less than 16.1 pounds?
A) Approximately 84%
B) Approximately 95%
C) Approximately 16%
D) Approximately 34% - CORRECT ANSWER C) Approximately 16%
50 Super Bowl viewers were polled by a statistician to determine whether or not
they expected Jay-Z to make a guest appearance during the halftime
performance. What type of data was collected?
A) Qualitative
B) Quantitative
C) Simple Random
D) Systematic
E) Normal - CORRECT ANSWER A) Qualitative
Given the frequency table below, what is the relative
frequency of the data value 2?
Value Frequency
26
34
45
57
63
A) 0.6
B) 0.24
C) 24
D) 0.06 - CORRECT ANSWER B) 0.24
, A distribution have a mean = 40, median = 80. What type of distribution most
likely describes the shape of it?
A) Skewed to the right
B) Skewed to the left
C) unable to determine with the information given
D) symmetric - CORRECT ANSWER B) Skewed to the left
A public opinion poll in Florida wants to determine whether registered voters in
the state approve of legalizing marihuana. They randomly select 50 registered
voters from each county in the state and ask whether they approve or disapprove
of legalizing marihuana. Identify the experimental unit of interest to the pollster.
A) 50 registered voters from each county in the state that the data was collected
from
B) A single registered voter in Florida
C) Opinion on legalizing marihuana
D) All registered voters in Florida - CORRECT ANSWER B) A single registered voter
in Florida
Given the frequency table below, calculate the mean.
Value Frequency
26
34
45
57
63
A) 3.88
B) 4
C) 4.92
D) 5.13 - CORRECT ANSWER A) 3.88
Calculate the sample standard deviation of the following sample data
230, 436, 320, 400, 188
A) 106.35
B) 248
C) 11311.2
D) 314.2 - CORRECT ANSWER A) 106.35
