Which of the following best describes the efficiency of dry scrubbers at removing particles that are less than 2 micrometers in diameter? Dry scrubbers are less than 20% efficient at removing particles less than 1μm and increase to over 50% efficiency at removing particles between 1 and 2μm. A Dry scrubbers are between 50% and 90% efficient at removing particles less than 2μm, depending on the flow rate. B Dry scrubbers are between 5% and 40% efficient at removing particles less than 2μm in size. C Dry scrubbers are less than 10% efficient at removing particles less than 1μm in size.

Offering career academies in high schools has become more popular during the past 30 years because they students prepare for work and postsecondary education. a principal at a large high school with a science, technology, engineering, and mathematics (stem) academy is interested in determining whether the status of a student is associated with level of participation in advanced placement (ap) courses. student status is categorized as (1) stem for students in the stem program or (2) regular. a simple random sample of 200 students in the high school was taken and each student was asked two questions: are you in the stem academy? in how many ap courses are you currently enrolled? the responses of the 200 students are summarized in the table. level of participation in advanced placement (ap) courses student status stem regular total no ap courses 17 31 48 one ap course 38 70 108 two or more ap courses 20 24 44 total 75 125 200 part a: is participating in two or more ap courses independent of student status?