MATH 1280 Self - Quiz Unit 2– University of the People | MATH1280 Self - Quiz Unit 2

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MATH 1280 Self - Quiz Unit 2– University of the People Top of Form Information text The next two questions refer to the following relative frequency table on hurricanes that have made direct hi... ts 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. Frequency of Hurricane Direct Hits Category # Direct Hits Relative Freq. Cum. Relative Freq. 1   0.39930  0.3993 2 72     3   0.2601   4   0.0659   5   0.0110 1.0000 Question 1 Correct Question text What is the relative frequency of direct hits that were category 2 hurricanes? Select one: a. 0.2637  b. 0.7363 c. 0.2601 d. Not enough information to calculate.  Question 2 Incorrect Question text The relative frequency of direct hits that were AT LEAST a category 3 storm is Answer. (The numerical answer that you provide should be of the form "0.xxxx", with four digits to the right of the zero.) Information text 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 Week Freq. Relative Freq. Cum. Relative Freq. 0 27 0.4500   1 18     3     0.9333 6 3     7 1 0.0167   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.) Question 3 Correct Question text The relative frequency that flossed 6 times per week is: Answer: Feedback  Question 4 Correct Question text The relative frequency that flossed at least once a week is: Answer: Information text 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: Question 5 Correct Question text The sample size is: Select one: a. 8  b. 9 c. 72 d. Not enough information to tell. Feedback:  Question 6 Correct Question text The frequency of production series where there are 4 malfunctioning products is: Select one: a. 57  b. 9 c. 16 d. Not enough information to calculate. Question 7 Correct Question text 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. Information text 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:  Question 8 Correct The number of variables is: Answer: The correct answer is: 7 Question 9 Correct Question text The type of the variable "id" is: Select one: a. numeric  b. factor Question 10 Correct Question text The type of the variable "sex" is: Select one: a. numeric b. factor  Feedback: Values are non-numeric: "MALE" and "FEMALE".  Question 11 Correct Question text The type of the variable "diastolic" is: Select one: a. numeric  b. factor Feedback: All values are numeric. Information text 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: Question 12 Correct Question text "Age" is what type of data? Select one: a. qualitative/factor  b. quantitative/numeric Feedback: Age is a numeric measurement. Question 13 Correct Question text "Type of activity" is what type of data? Select one: a. qualitative/factor  b. quantitative/numeric Feedback: This variable obtains categorical values Identify the type of data that would be used to describe a response for each of the items below: Question 14 Correct Number of tickets sold to a concert. Select one: a. qualitative/factor b. quantitative/numeric  Question 15 Correct Favorite baseball team. Select one: a. qualitative/factor  b. quantitative/numeric Feedback: The correct answer is: qualitative/factor Question 16 Correct Number of students enrolled at Evergreen Valley College. Select one: a. qualitative/factor b. quantitative/numeric  Question 17 Correct Distance to the closest movie theater. Select one: a. qualitative/factor b. quantitative/numeric  Question 18 Correct Number of competing computer spreadsheet software packages. Select one: a. qualitative/factor b. quantitative/numeric  [Show More]

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