Bull riding has become a very popular rodeo sport—the action is fast and dangerous. A bull ride is scored by two judges; one actually rates the bull, while the other evaluates the rider. The variance...

Bull riding has become a very popular rodeo sport—the action is fast and dangerous. A bull ride is scored by two judges; one actually rates the bull, while the other evaluates the rider. The variance in bull-riding time tends to be large, approximately 22.5 seconds2 . A random sample of 37 bull rides was selected over an entire rodeo season. The sample variance in riding times was s 2 =15.6 seconds2 . Smaller variability in bull-riding time translates to a more monotonous, unexciting rodeo. Is there any evidence that bull riding has become less exciting? Assume normality and use

The Obama administration worked to make health care more affordable and accountable. However, there is considerable variation across the country in provider charges for common medical services. A random sample of hospitals was obtained and the charge for outpatient service 300 was recorded for each.