Unit 2 statistics self quiz.docx

# The cumulative frequency of production series that

• Test Prep
• 7

This preview shows pages 4–6. Sign up to view the full content.

The cumulative frequency of production series that have 3 malfunctioning products or less or less is 41. The frequency of production series that have exactly 4 production series is the difference between these two numbers: 57 - 41 = 16. Question 7 The frequency of production series where there are less than 7 malfunctioning products is: Select one: a. 70 b. 71 c. 72 d. Not enough information to calculate. Feedback Having less that 7 malfunctioning products corresponds to having 6 malfunctioning products or less. The cumulative frequency of production series with 6 malfunctioning products or less is 70. Information Information text The file "ex2.csv" contains information on the blood pressure of a group of healthy individuals. The file is located in . ( ALTERNATE DOWNLOAD LINK ) Read the data into R and answer the following 4 questions: Question 8 The number of variables is: Answer: Feedback After saving the file "ex2.csv" in the working directory one can use the code > ex2 <- read.csv("ex2.csv") in order to read the file into a data frame by the name "ex2". Writing the content of the object to the screen will produce: 3

This preview has intentionally blurred sections. Sign up to view the full version.

> ex2 id sex age bmi systolic diastolic group 1 3695908 FEMALE 34 28.78903 112.5887 64.84949 NORMAL 2 5778095 FEMALE 33 18.91321 122.9261 78.71555 NORMAL 3 5138370 MALE 32 27.66339 128.3985 86.57248 NORMAL ... Question 9 The type of the variable "id" is: Select one: a. numeric b. factor Feedback All the values are numbers. Technically, R treats this variable as a numeric sequence. However, one would typically not use this variable for statistical inference. Usually, it serves as a key, a unique identifier, in data set management.
This is the end of the preview. Sign up to access the rest of the document.
• Spring '18
• Frequency, Frequency distribution, Summary statistics, Category 3 cable, Category 2 cable

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern