MATH_1280_Final_Exam_Review_Quiz complete #graded A#

Dashboard / My courses / MATH 1280-01 - AY2023-T4 / 7 April - 13 April / Self-Quiz Unit 1 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 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: 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, 10, 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 1.7. 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: Question 7 Correct The average number of calls recorded in the object "Feb" is 5.85. The average in the object "Sep" is 8.5. The ◄MaLrke1a.r0n0ionugt oJof urnal Udniftfe1rence between these 1.00 Select one: a. A population. b. A sample. c. A statistic. d. None of the above. The difference between the averages is a characteristic of the data, a statistic. A hint that the correct answer is a statistic and not a parameter is the fact that one can compute the value of the average from the data. ..........................................................continued.......................................