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MATH 1280 FINAL EXAM ACTUAL EXAM
2024 ALL 136 QUESTIONS AND CORRECT
ANSWERS (PROFESSOR VERIFIED) |
LATEST EDITION | REAL EXAM
NOTE: THE CORRECT ANSWERS ARE PROVIDED AT THE END OF EACH QUESTION! ALL THE BEST!
Started on State Finished Completed on Time taken Marks Grade Information An automobile producing company operates car dealerships that sell its cars. In order to assess the service costumers get at the dealerships a team from the Customer Relationship Department was assembled. The team was sent to 20 randomly selected dealerships. Each dealership was visited once by the team for an entire working day. During a visit the team interviewed all the customers that arrived at the that dealership. One of the questions that each of the customers were asked is: "Do you currently possess a car made by our company?" The answers were marked down as "Yes", "No", or "Refuse to Answer", depending on the customer's response. Select the correct answer in each of the following 4 questions:
Question 1
Correct Mark 1.00 out of 1. Dashboard / My courses / MATH 1280 - 01 - AY2023-T1 / Final Exam (Days 1 - 4) / Review Quiz
The population in this survey is: Select one: a. The researchers that conducted the survey. b. Customers that arrive at dealerships of the company. c. The automobile producing company. d. Owners of cars that are produced by the company. The correct answer is: Customers that arrive at dealerships of the company.
Correct Mark 1.00 out of 1. A statistic that may be used to summarize the outcome of the survey is: Select one: a. Chi-Square b. Percentage c. T-Test d. Anova The correct answer is: Percentage Information The Customers Service Center of a large bank receive calls from customers. The number of incoming calls between 8:00 AM and 8:10 AM in consecutive days were recorded. The number of incoming calls during the working days of the month of September were: 8, 1 0, 6, 7, 12, 7, 8, 7, 8, 6, 9, 4, 6, 14, 10, 10, 10, 10, 6, 10, 12, 7 The number of incoming calls during the working days of the month of February were: 9, 11, 14, 6, 4, 6, 7, 3, 3, 2, 5, 6, 6, 5, 6, 7, 5, 4, 3, 5. Create two R objects, one by the name "Sep", and the other by the name "Feb". The first object should contain the first data and the second object should contain the second data. Produce a frequency table (with the function "table") for each of the objects and a bar plot (with the combination of the function "plot" and the function "table"). For comparison, bar plots like the one you should obtain are presented in Figure 1.6. and Figure 1.. In light of the description given above, and based on the tables and/or the plots, select the correct answer in each of the following 6 questions:
Correct Mark 1.00 out of 1. The data used to produce the tables and plots is: Select one: a. A population. b. A sample. c. A parameter. d. A statistic. The correct answer is: A sample.
Question 6
Incorrect Mark 0.00 out of 1. The average number of calls that arrived between 8:00 AM and 8:10 AM during the working days of all months is: Select one: a. A population. b. A sample. c. A parameter. d. A statistic. The correct answer is: A parameter.
Incorrect Mark 0.00 out of 1. The height of the forth bar from the left of the bar plot for the month of February represents the fact that? Select one: a. In 4 of the days of the month of February there were 5 incoming calls. b. In 5 of the days of the month of February there were 4 incoming calls. c. In 4 of the days of the month of February there were 2 incoming calls. d. In 2 of the days of the month of February there were 4 incoming calls. The correct answer is: In 4 of the days of the month of February there were 5 incoming calls.
Question 10
Correct Mark 1.00 out of 1. The location of the highest bar of the bar plot for the month of September represents the fact that? Select one: a. 5 incoming calls came during 6 days of the month of February. b. 6 incoming calls came during 10 days of the month of September. c. 6 incoming calls came during 5 days of the month of February. d. 10 incoming calls came during 6 days of the month of September. The correct answer is: 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 ) Frequency of Hurricane Direct Hits Information Category # Direct Hits Relative Freq. Cum. Relative Freq. 1 0.39930 0. 2 72 3 0. 4 0. 5 0.0110 1.
Question 11
Incorrect Mark 0.00 out of 1. What is the relative frequency of direct hits that were category 2 hurricanes? Select one: a. 0. b. 0. c. 0. d. Not enough information to calculate. The total of all relative frequencies is 1.000. Denote by p the relative frequency of category 2 hurricanes. Observe that 0.3993 + p + 0.2601 + 0.0659 + 0.0110 = 1. Consequently, p = 1 - 0.3993 + 0.2601 + 0.0659 + 0.0110 = 1 - 0.7363 = 0. The correct answer is: 0.
Not answered Marked out of 1. The relative frequency that flossed at least once a week is: Answer: The relative frequency of adults that do not floss at all is 0.4500. All other adults floss at least once a week. Their relative frequency is 1.0000 - 0.4500 = 0.5500. The correct answer is: 0.
Question 14
Not answered Marked out of 1. Information 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: The relative frequency that flossed 6 times per week is: Answer: It is given that the total number of adults with gum disease is 60. There are 3 such adults that flossed 6 times per week. Therefore, the relative frequency is 3/60 = 0. The correct answer is: 0.
Incorrect Mark 0.00 out of 1. The sample size is: Select one: a. 8 b. 9 c. 72 d. Not enough information to tell. The object "freq" contain the table of frequency of the production series, divided according to the number of malfunctioning products that they had. The cumulative frequency of all the production series that had 8 malfunctioning products or less, which includes all production series, is reported under the number "8" in the output of the expression "cumsum(freq)". This number is
The correct answer is: 72
Question 16
Correct Mark 1.00 out of 1. 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. The cumulative frequency of production series that have 4 malfunctioning products or less is 57. 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. The correct answer is: 16
Question 19
Incorrect Mark 0.00 out of 1. The type of the variable "id" is: Select one: a. numeric b. factor 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. The correct answer is: factor The number of variables is: Answer: 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: ex 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 ... The correct answer is: 7 Not answered Marked out of 1.
Incorrect Mark 0.00 out of 1. The type of the variable "sex" is: Select one: a. numeric b. factor Values are non-numeric: "MALE" and "FEMALE". The correct answer is: factor
Question 21
Correct Mark 1.00 out of 1. The type of the variable "diastolic" is: Select one: a. numeric b. factor All values are numeric. The correct answer is: numeric Information 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:
Incorrect Mark 0.00 out of 1. Number of tickets sold to a concert. Select one: a. qualitative/factor b. quantitative/numeric The correct answer is: quantitative/numeric
Question 25
Incorrect Mark 0.00 out of 1. Favorite baseball team. Select one: a. qualitative/factor b. quantitative/numeric The correct answer is: qualitative/factor
Question 26
Correct Mark 1.00 out of 1. Number of students enrolled at Evergreen Valley College. Select one: a. qualitative/factor b. quantitative/numeric The correct answer is: quantitative/numeric
Incorrect Mark 0.00 out of 1. Distance to the closest movie theater. Select one: a. qualitative/factor b. quantitative/numeric The correct answer is: quantitative/numeric
Question 28
Incorrect Mark 0.00 out of 1. Number of competing computer spreadsheet software packages. Select one: a. qualitative/factor b. quantitative/numeric The correct answer is: quantitative/numeric
Box plot 1 Box plot 2 Box plot 3 Observe the range of distribution each data: [10,40] in Histogram a, [-40,30] in Histogram b and [14,28] in Histogram c. (You may want to increase the Plot. That can be done on many browsers with Control plus the "+" key. Or you may download the figure an open it with a graphical application.) The correct answer is: Box plot 1 → Histogram b, Box plot 2 → Histogram a, Box plot 3 → Histogram c Histogram c Histogram a Histogram b
Correct Mark 1.00 out of 1. Consider the box plots in Figure A. Which of the data has a smaller inter-quartile range (IQR)? Figure A Select one: a. Box plot 1 b. Box plot 2 c. Box plot 3 d. Cannot tell based on the box plots. The hight of the central box in Box-plot 3 is the least of the three. The correct answer is: Box plot 3
