Predict the shape of the distribution of the salaries of 25 chief executive ofcers {CEDs}. A typical value is about 50 million per year, but there is an outlier at about BEE] million. Choose the correct answer below. It should be left-skewed. It should be rcug hly symmetric. It should be right-skewed. It should be bimodal. A study was done to see whether a smaller dose of Flu vaccine could be used successfully. In this study, the usual amountof vaccine was iniected into half the patients. and the other half of the patients had only a small amount of vaccine injected. The response was measured by looking at the production of antibodies. In the end. the lower dose of vaccine was iust as effective as a higher dose for those under 65 years old. What more do we need to know to be able to conclude that the lower dose of vaccine was equally efleotive at preventing the u for those under 65? Choose the correct answer below. 0 A. The patients need to be randome assigned the full or lower dose. Without randomization there could be bias, howeven with randomization we can infer causation. O B. This is an observational study and causation cannot be inferred. O C. The sample size must be at least 500 to ensure the sample size is large enough to infer causation. O D. This is a controlled experiment and causation cannot be inferred