At City Community College, every freshman must take English 101. The English department wants to know whether students who take this class in
their second semester get better grades than students who take the class in
their first semester. Which principle of experimental design can the English
department best use to include a variety of students in both the first and
second semester treatment groups of the study?

Muscles, a membership-only gym is hoping to open a new branch in a small city in pennsylvania that currently has no fitness centers. according to their research approximately 12,600 residents live within driving distance of the gym. muscles sends out surveys to a sample of 300 randomly selected residents in this area (all of who respond) and finds that 40 residents say they would visit a gym if one was located in their area. based on the past survey research, muscles estimates that approximately 30% of these respondents would actually join the gym if they opened one in the area. based on this information and the results of the sample survey, about how many residents should muscles expect to join its new branch? a) 134 b) 504 c) 1,680 d) 3,780

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

Through non-collinear points there is exactly one plane.