MATH 1280: INTRODUCTION TO STATISTICS – Assignment Unit 2
1
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Assignment Unit 2
UoPeople
MATH 1280: INTRODUCTION TO STATISTICS
MATH 1280: INTRODUCTION TO STATISTICS – Assignment Unit 2
2
This study source was downloaded by 100000868289449 from CourseHero.com on 08-28-2023 08:32:46 GMT -05:00
https://www.coursehero.com/file/82083398/MATH-1280-INTRODUCTION-TO-STATISTICS-Assignment-Unit-2docx/
MATH 1280: INTRODUCTION TO STATISTICS – Assignment Unit 2
Quizzes and graded assignments in MATH1280 are NOT group projects. Please answer the
questions and do not share the questions or answers with others or accept advance access to
questions or answers from others.
The file “flowers.csv” file contains information on measurements of the iris flowers. Create an R
data frame by the name “flower.data” that contains the data in the file.
The following R code shows an example of how to round a vector of numbers to zero decimal
places and then calculate some statistics using the rounded numbers. You might need some of
the calculations for this assignment, but you might not need others. You would replace
example$years with the name of the R object that you want to analyze (in other programming
languages, you might call example$years a variable).
x <- round(example$years, 0)
freq <- table(x)
rel.freq <- freq/sum(freq)
cumsum(rel.freq)
Cumulative Frequency Table for Petal Length
Use the following table to answer tasks 2-4.
Value: 1 2 3 4 5 6 7
Cumulative Relative Frequency: .16 .33 .35 .58 .81 .97 1.00
Tasks
a. The number of English-speaking people on the planet who want to play a
b. 300
c. 200
d. 100
e. 20
new kind of online video game.
FINAL
Question 1
You are interested in the number of English-speaking people on the planet
who want to play a new kind of online video game. You asked 300 college
students if they were interested in playing video games, 100 said yes, and of
them 20 preferred your game to an existing game that is widely used.
How many people were in the sample?
Select one:
Question 4
MATH 1280 Final Exam (100 out of 100) Questions and Answers_
University of the People
Question 2
What is the mean of x?
x <- c(12, 14, 11, 14, 13, 15, 12, 16, 10)
Select one:
a. 12
b. 13
c. 14
d. 15
e. 16
Question 3
Using the value of x from the prior question, what is the standard deviation of
x?
Select one:
a. 1
b. 3.75
c. 9
d. sqrt(13)
e. 1.94