Math 1280 Introduction To Statistics
MATH 1280 INTRODUCTION TO STATISTICS
COMPLETE 100 QUESTIONS WITH CORRECT
VERIFIED ANSWERS (100% CORRECT ANSWERS)||
MATH 1280 INTRODUCTION TO STATISTICS
2025/2026 EXAM
The population in this survey is: - ANSWER-The target of the survey is to assess
the service that costumers get at the dealerships.
The correct answer is: Customers that arrive at dealerships of the company.
The sample in this survey is: - ANSWER-that arrive at the selected dealerships
during the day of visit.
A parameter that may be targeted by this survey is: - ANSWER-The percentage of
costumers that possess a car made by the company.
A statistic that may be used to summarize the outcome of the survey is: -
ANSWER-The percentage, among costumers that were interviewed, of those that
do not possess a car made by the company
The data used to produce the tables and plots is: - ANSWER-A sample.
The average number of calls that arrived between 8:00 AM and 8:10 AM during
the working days of any month is: - ANSWER-A parameter.
The average number of calls recorded in the object "Feb" is 5.85. The average in
the object "Sep" is 8.5. The difference between these two numbers is: - ANSWER-
A statistic.
In which of the months the number of incoming calls between 8:00 AM and 8:10
AM tends to be smaller? - ANSWER-February.
The height of the fourth bar from the left of the bar plot for the month of February
represents the fact that? - ANSWER-In 4 of the days of the month of February
there were 5 incoming calls.
, Math 1280 Introduction To Statistics
The location of the highest bar of the bar plot for the month of September
represents the fact that? - ANSWER-10 incoming calls came during 6 days of the
month of September.
The next two questions refer to the following relative frequency table on
hurricanes that have made direct hits on the U.S. between 1851 and 2004.
Hurricanes are given a strength category rating based on the minimum wind speed
generated by the storm. (http://www.nhc.noaa.gov/gifs/table5.gif ) (ALTERNATE
DOWNLOAD LINK) - ANSWER-
What is the relative frequency of direct hits that were category 2 hurricanes? -
ANSWER-0.2637
The relative frequency of direct hits that were AT LEAST a category 3 storm is -
ANSWER-0.337
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:
Flossing Frequency for Adults with Gum Disease# per WeekFreq.Relative
Freq.Cum. Relative Freq.0270.4500 118 3 0.933363 710.0167
Fill in the blanks in the table and answer the next two question: (The numerical
answer that you provide should be of the form "0.xxxx", with 4 digits to the right
of the zero.) - ANSWER-
The relative frequency that flossed 6 times per week is: - ANSWER-0.05
The relative frequency that flossed at least once a week is: - ANSWER-0.55
The number of malfunctioning products per production series was recorded for
several production series. The data was entered into an R object by the name
"malfunction". The next 3 questions refer to the following R code: - ANSWER-
The sample size is: - ANSWER-72
The frequency of production series where there are 4 malfunctioning products is: -
ANSWER-16
The frequency of production series where there are less than 7 malfunctioning
products is: - ANSWER-70
, Math 1280 Introduction To Statistics
The file "ex2.csv" contains information on the blood pressure of a group of healthy
individuals. The file is located in
http://pluto.huji.ac.il/~msby/StatThink/Datasets/ex2.csv. (ALTERNATE
DOWNLOAD LINK) Read the data into R and answer the following 4 questions -
ANSWER-
The number of variables is: - ANSWER-7
The type of the variable "id" is: - ANSWER-factor
The type of the variable "sex" is: - ANSWER-factor
The type of the variable "diastolic" is: - ANSWER-numeric
A study was done to determine the age, type of activity, number of times per week
and the duration (amount of time) of resident use of a local park in San Jose. The
first house in the neighborhood around the park was selected randomly and then
every 8th house in the neighborhood around the park was interviewed. Answer the
following 2 questions: - ANSWER-
"Age" is what type of data? - ANSWER-quantitative/numeric
"Type of activity" is what type of data? - ANSWER-qualitative/factor
Identify the type of data that would be used to describe a response for each of the
items below: - ANSWER-
Number of tickets sold to a concert. - ANSWER-quantitative/numeric
Favorite baseball team. - ANSWER-qualitative/factor
Number of students enrolled at Evergreen Valley College. - ANSWER-
quantitative/numeric
Distance to the closest movie theater. - ANSWER-quantitative/numeric
Number of competing computer spreadsheet software packages. - ANSWER-
quantitative/numeric
MATH 1280 INTRODUCTION TO STATISTICS
COMPLETE 100 QUESTIONS WITH CORRECT
VERIFIED ANSWERS (100% CORRECT ANSWERS)||
MATH 1280 INTRODUCTION TO STATISTICS
2025/2026 EXAM
The population in this survey is: - ANSWER-The target of the survey is to assess
the service that costumers get at the dealerships.
The correct answer is: Customers that arrive at dealerships of the company.
The sample in this survey is: - ANSWER-that arrive at the selected dealerships
during the day of visit.
A parameter that may be targeted by this survey is: - ANSWER-The percentage of
costumers that possess a car made by the company.
A statistic that may be used to summarize the outcome of the survey is: -
ANSWER-The percentage, among costumers that were interviewed, of those that
do not possess a car made by the company
The data used to produce the tables and plots is: - ANSWER-A sample.
The average number of calls that arrived between 8:00 AM and 8:10 AM during
the working days of any month is: - ANSWER-A parameter.
The average number of calls recorded in the object "Feb" is 5.85. The average in
the object "Sep" is 8.5. The difference between these two numbers is: - ANSWER-
A statistic.
In which of the months the number of incoming calls between 8:00 AM and 8:10
AM tends to be smaller? - ANSWER-February.
The height of the fourth bar from the left of the bar plot for the month of February
represents the fact that? - ANSWER-In 4 of the days of the month of February
there were 5 incoming calls.
, Math 1280 Introduction To Statistics
The location of the highest bar of the bar plot for the month of September
represents the fact that? - ANSWER-10 incoming calls came during 6 days of the
month of September.
The next two questions refer to the following relative frequency table on
hurricanes that have made direct hits on the U.S. between 1851 and 2004.
Hurricanes are given a strength category rating based on the minimum wind speed
generated by the storm. (http://www.nhc.noaa.gov/gifs/table5.gif ) (ALTERNATE
DOWNLOAD LINK) - ANSWER-
What is the relative frequency of direct hits that were category 2 hurricanes? -
ANSWER-0.2637
The relative frequency of direct hits that were AT LEAST a category 3 storm is -
ANSWER-0.337
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:
Flossing Frequency for Adults with Gum Disease# per WeekFreq.Relative
Freq.Cum. Relative Freq.0270.4500 118 3 0.933363 710.0167
Fill in the blanks in the table and answer the next two question: (The numerical
answer that you provide should be of the form "0.xxxx", with 4 digits to the right
of the zero.) - ANSWER-
The relative frequency that flossed 6 times per week is: - ANSWER-0.05
The relative frequency that flossed at least once a week is: - ANSWER-0.55
The number of malfunctioning products per production series was recorded for
several production series. The data was entered into an R object by the name
"malfunction". The next 3 questions refer to the following R code: - ANSWER-
The sample size is: - ANSWER-72
The frequency of production series where there are 4 malfunctioning products is: -
ANSWER-16
The frequency of production series where there are less than 7 malfunctioning
products is: - ANSWER-70
, Math 1280 Introduction To Statistics
The file "ex2.csv" contains information on the blood pressure of a group of healthy
individuals. The file is located in
http://pluto.huji.ac.il/~msby/StatThink/Datasets/ex2.csv. (ALTERNATE
DOWNLOAD LINK) Read the data into R and answer the following 4 questions -
ANSWER-
The number of variables is: - ANSWER-7
The type of the variable "id" is: - ANSWER-factor
The type of the variable "sex" is: - ANSWER-factor
The type of the variable "diastolic" is: - ANSWER-numeric
A study was done to determine the age, type of activity, number of times per week
and the duration (amount of time) of resident use of a local park in San Jose. The
first house in the neighborhood around the park was selected randomly and then
every 8th house in the neighborhood around the park was interviewed. Answer the
following 2 questions: - ANSWER-
"Age" is what type of data? - ANSWER-quantitative/numeric
"Type of activity" is what type of data? - ANSWER-qualitative/factor
Identify the type of data that would be used to describe a response for each of the
items below: - ANSWER-
Number of tickets sold to a concert. - ANSWER-quantitative/numeric
Favorite baseball team. - ANSWER-qualitative/factor
Number of students enrolled at Evergreen Valley College. - ANSWER-
quantitative/numeric
Distance to the closest movie theater. - ANSWER-quantitative/numeric
Number of competing computer spreadsheet software packages. - ANSWER-
quantitative/numeric
