According to the 2020 Bureau of Transportation Statistics, 55.7% of flights arrive on-time. Of those flying Delta, 67.6% of flights arrive on time. However, only 47.0% of flights arrive on time for those flying Southwest. Which of the following values are conditional probabilities in this scenario? Select all that apply. 0 47.0% 55.7% 67.6% 2020Adult male polar bears are expected to weigh, on average, 370 kg. A polar bear's primary source of food are seals and other marine animals, which they hunt from a platform of sea ice. Scientists are concerned that global warming is melting these platforms earlier in the year, reducing the time polar bears are able to hunt and forcing them inland without the necessary fat reserves built up to survive summer and fall. The US Geological Survey (USGS) conducted a study in the Southern Beaufort Sea to investigate whether climate change has appeared to negatively impact the weight of polar bears, on average. Eighty-three adult male polar bears were captured between March and May of the years 1990 and 2006 and their weights were recorded. The sample mean weight was 324.6 kg and the sample standard deviation was 88.3 kg. Are validity conditions met in order to use theory-based methods? Yes, since there are at least 10 successes and 10 failures. Yes, since the sample distribution is approximately symmetric. Yes, since the sample size is greater than 20 and the sample distribution is not strongly skewed. We cannot determine whether validity conditions are met with the information given.Sickle-cell disease is a painful disorder of the red blood cells. To investigate whether drug A can reduce the pain associated with sickle- cell disease, a study by the National Institutes of Health randomly assigned 150 sickle-cell sufferers to receive the drug. Placebos were given to another 150 sickle-cell sufferers. Great care was used to ensure that the 300 participants did not know if their pill contained the drug. At the end of the treatment period, the researchers counted the number of episodes of pain reported by each subject. Which of the following principles was not used in this study? Blinding Control group Randomization BlockingResearchers randomly assigned patients with severe acne to one of two treatments: the standard topical antibiotic (our control) or a new antibiotic taken orally (the treatment). Six months later an evaluation of skin problems was made by a doctor who did not know which medication subjects had been given. What is the primary advantage of random assignment of the treatment? It allows inference back to a population of patients with acne. It ensures that the study participants are representative of the larger population. It allows the researchers to infer that any difference in outcome was due to the treatments. It ensures that the subject doesn't know which treatment they are getting