Claudia is interested in knowing which figure skater competing in the Olympic Games is most favored to win a gold medal. To sample the students in her school, she prepares a list of all of the boys and girls in the school and randomly chooses a sample from each group so that the size of each group is proportional to the number of boys and girls in the school. Which sampling method did Claudia use? A. simple random sampling
B. stratified random sampling
C. systematic random sampling
D. simple non-random sampling

You estimate that a kitten weighs 8 pounds the actual weight of the kitten is 6 pounds what is the percent error rounded to the nearest hundreth of a percent

Brittany has designed four different birdcages, each with the same volume: a square pyramid, a cylinder, a cone, and a sphere. the zoo wants to use one of brittany’s designs but plans to change the volume of the cage. find the design change that would result in the birdcage with the greatest volume. a.) increase the area of the base of the square pyramid by a factor of ten. b.) increase the height of the cylinder by a factor of ten. c.) increase the radius of the cone by a factor of ten. d.) increase the radius of a sphere by a factor of ten.

Two researchers are attempting to create a new psychotherapy protocol that more reduces panic attacks. they believe that they have succeeded and are now in the clinical trial period of their protocol's development. they are working with several cohort groups, some of which have been through the new protocol, while others have done the standard protocol currently recommended. if these researchers are interested in evaluating the difference in the percentage of test subjects who successfully decreased their panic attacks in 2 months on the new protocol versus the percentage of test subjects who successfully decreased their panic attacks in 2 months with the traditional protocol, which of the following statistical tests would be most appropriate? a. analysis of variance (anova) b. correlation c. chi-square test d. paired t-test e. independent t-test