3. Imagine an urn filled with white and black balls. You know that two-thirds of the balls are one color and one-third are the other, but you don't know which color predominates. One blindfolded
person plunges a hand into the urn and comes up with 3 black balls and 1 white ball. Another
uses both hands and comes up with 14 black balls and 10 white balls. Which sample provides
the more convincing evidence that the urn contains more black balls than white balls?
(a) the first, or 3:1 sample
(b) the second, or 14:10 sample
(C) they are equally convincing

Ahigh school teacher wants to study the seating habits of students in the cafeteria to determine if students sit in the same seats or change seats from day to day. she sits in the cafeteria for several days, and without interacting with the students, records where they sit each day. what is a potential benefit of this type of research? there is an independent variable. there is a dependent variable. the researcher can gain personal information about an individual. the participants act normally. the information can be gathered over a period of several years.