2. Perform the following operations and express the answers in scientific notation, a. (4.3 X 10%) X (20 X 10%)
b. (6.0 X 103) X (1.5 X 10-2)
C. (1.5 X 10-2) X (8.0 x 10-1)
d.
7.8 x 103
1.2 X 10^
8.1 x 10-2
9.0 X 102

Which data set has a greater spread? why? set a: {38, 12, 23, 48, 55, 16, 18} set b: {44, 13, 24, 12, 56} has a greater spread because .

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297