hi i need help with some stat problems in the screenshot below

{2ptsl You decide you want to administer a survey about our country's attitude about taking a COVID19 vaccine. You are trying to decide on a sampling frame which would reduce the chance of bias in your results. Sending your survey to a random sample from which group would probably give you the GREATEST chance of having a biased FGSUII? A) The mailing list members of a national anti-vaxxers organization. 0 B} The mailing list of customers of every major health insurance company in the US. C} The mailing list of every household in the US census. {2ptsl In dosigning an experiment, what is the most important result of random assignment into groups from your pool of available subjects? A) Random assignment absolutely proves scientically the cause-effect relationship between the explanatory variable and the response variable. B] Random assignment helps minimize the differences in lurking, confounding and even unimagined variables between your sample groups. C) Random assignment makes the summarizing of results easier to explain. D} Random assignment helps keep the relative size of your sample groups the same. E] None of the above. {15 pts) The given side-by-side stemplot displays the test scores of 15 physics students and 14 french students. Compute the mean score of the physics students. Q Compute the median score of the french students Compute the IQR of the physics studentsg Compute the standard deviation of the french students. a Which class had more consistent scores? Compute the z-score Sally, who made a 91 on the PHYSICS test. @ Compute the z-score of Joe, who made a 91 on the FRENCH test. a Whose performance was statistically better- Sally or Joe? a Suppose the physics teacher decides to add 9 points to the score of every student. Select EACH and EVERY statistic which would have a different value when computed for the new set of scores. a