Question 6 Exhibit 2-1 The numbers of hours worked (per week) by 400 statistics students are shown below. Number of hours Frequency 0 - 20 10 - 19 80 20 - 29 200 30 - 39 100 Refer to Exhibit 2-1. The class width for this distribution O a. is 10 O b. is 39, which is: the largest value minus the smallest value or 39 - 0 = 39 O c. varies from class to class O d. is 9Question Completion Status: .> A Moving to another question will save this response. Question 8 Statisticians recommend treating any data value with a z-score less than _ or greater than as an outlier. O a. -4.0, +4.0 O b.-2.5, +2.5 O c. -3.5, +3.5 O d. -3.0, +3.0Remaining Time: 1 hour, 44 minutes, 47 seconds. Question Completion Status: .> A Moving to another question will save this response. > Question 9 2 points Save Answer In a sample of 800 students in a university, 160, or 20%, are Business majors. Based on the above information, the school's paper reported that "20% of all the students at the university are Business majors." This report is an example of O a. descriptive statistics O b. a population O c. statistical inference O d. a sample